bcoder

jPCT-AE文档阅读笔记

分类：Uncategorized 阅读 (1,359) 已关闭评论

12月 162021

一、环境要求

需要在Android 1.5以上运行，如果需要使用OpenGL ES 2.0，需要在Android 2.2或以上。

二、安装

下载jPCT-AE库，将jpct_ae.jar添加到项目中。

三、线程安全

jPCT-AE不是线程安全，尽量不要跨线程操作jPCT-AE的对象。

GLSurfaceView的Render方法是在Android的主UI线程中运行的吗？

答：onDrawFrame是用于进行实际渲染的方法，运行在Render子线程中。

四、Render类的两个重要方法

1、onSurfaceChanged(GL10 gl, int w, int h)

用于初始化创建或者更新World和FrameBuffer等对象。

2、onDrawFrame

实际的渲染过程所在的方法。

可以进行实际的绘制操作，也可以进行绘制帧率的计算或者控制（比如控制帧率为30fps以节省设备电量）。

五、jPCT的坐标系

通常，一些图像库的坐标系是这样的，

向右为x轴正向，向上为y轴正向，指向屏幕外为z轴正向，

但是jPCT的坐标系不太一样，jPCT和上述坐标系比较的话，围绕x轴旋转了180度，如下：

向右为x轴正向，向下为y轴正向，指向屏幕内为z轴正向。

如果你同时使用了其他不同坐标系的代码，需要对坐标进行一些转换。

六、素材加载

加载3D动画

加载3DS模型

加载obj文件

七、内存优化

https://www.jpct.net/wiki/index.php?title=Reducing_memory_usage

HighChart禁用标题和副标题的方法

分类：Javascript, Others 阅读 (806) 已关闭评论

5月 092021

title: {
    text: '',
    style: {
        display: 'none'
    }
},
subtitle: {
    text: '',
    style: {
        display: 'none'
    }
},

title: {

text: '',

style: {

display: 'none'

}

subtitle: {

text: '',

style: {

display: 'none'

}

Android实现TextView搜索关键字高亮显示

分类：Android, Java 阅读 (1,370) 已关闭评论

3月 222021

效果图如下：

关键字搜索不区分大小写，TextView换成EditText也同样适用。

Activity部局代码如下：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/edtKeyword"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ems="10"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toStartOf="@+id/btnSearch"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnSearch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:text="搜索"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvContent"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:ems="10"
        android:gravity="start|top"
        android:inputType="textMultiLine"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edtKeyword" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<EditText

android:id="@+id/edtKeyword"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_marginStart="8dp"

android:layout_marginLeft="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:ems="10"

android:inputType="textPersonName"

app:layout_constraintEnd_toStartOf="@+id/btnSearch"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<Button

android:id="@+id/btnSearch"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:text="搜索"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<TextView

android:id="@+id/tvContent"

android:layout_width="0dp"

android:layout_height="0dp"

android:layout_marginStart="8dp"

android:layout_marginLeft="8dp"

android:layout_marginTop="8dp"

android:layout_marginEnd="8dp"

android:layout_marginRight="8dp"

android:layout_marginBottom="8dp"

android:ems="10"

android:gravity="start|top"

android:inputType="textMultiLine"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/edtKeyword" />

</androidx.constraintlayout.widget.ConstraintLayout>

Activity代码如下：

package com.example.highlightstrapp;


import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    private EditText edtKeyword;
    private TextView tvContent;
    private Button btnSearch;

    private String mContent = "　　There are moments in life when you miss someone so much that you " +
            "just want to pick them from your dreams and hug them for real! Dream what you want to " +
            "dream;go where you want to go;be what you want to be,because you have only one life " +
            "and one chance to do all the things you want to do.\n" +
            "\n" +
            "　　May you have enough happiness to make you sweet,enough trials to make you strong," +
            "enough sorrow to keep you human,enough hope to make you happy? Always put yourself " +
            "in others’shoes.If you feel that it hurts you,it probably hurts the other person, too.\n" +
            "\n" +
            "　　The happiest of people don’t necessarily have the best of everything;they just " +
            "make the most of everything that comes along their way.Happiness lies for those who " +
            "cry,those who hurt, those who have searched,and those who have tried,for only they " +
            "can appreciate the importance of people";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initViews();
        initEvents();
    }

    private void initEvents() {
        btnSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hightStr(edtKeyword.getText().toString(), mContent);
            }
        });
    }

    private void initViews() {
        tvContent = findViewById(R.id.tvContent);
        edtKeyword = findViewById(R.id.edtKeyword);
        btnSearch = findViewById(R.id.btnSearch);
    }

    public void hightStr(String hlStr, String srcString){
        tvContent.setText("");
        String hlLower = hlStr.toLowerCase();
        int lastEnd = 0;
        SpannableString spannableString = new SpannableString(srcString);
        for(int i = 0; i <= srcString.length() - hlStr.length(); i++){
            if(srcString.substring(i, i + hlStr.length()).toLowerCase().equals(hlLower)){
                spannableString.setSpan(new ForegroundColorSpan(Color.RED), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                spannableString.setSpan(new BackgroundColorSpan(Color.YELLOW), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            }
        }

        tvContent.append(spannableString);
    }

}

package com.example.highlightstrapp;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.text.SpannableString;

import android.text.Spanned;

import android.text.style.BackgroundColorSpan;

import android.text.style.ForegroundColorSpan;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

private EditText edtKeyword;

private TextView tvContent;

private Button btnSearch;

private String mContent = "　　There are moments in life when you miss someone so much that you " +

"just want to pick them from your dreams and hug them for real! Dream what you want to " +

"dream;go where you want to go;be what you want to be,because you have only one life " +

"and one chance to do all the things you want to do.\n" +

"\n" +

"　　May you have enough happiness to make you sweet,enough trials to make you strong," +

"enough sorrow to keep you human,enough hope to make you happy? Always put yourself " +

"in others’shoes.If you feel that it hurts you,it probably hurts the other person, too.\n" +

"\n" +

"　　The happiest of people don’t necessarily have the best of everything;they just " +

"make the most of everything that comes along their way.Happiness lies for those who " +

"cry,those who hurt, those who have searched,and those who have tried,for only they " +

"can appreciate the importance of people";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initViews();

initEvents();

}

private void initEvents() {

btnSearch.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

hightStr(edtKeyword.getText().toString(), mContent);

}

});

}

private void initViews() {

tvContent = findViewById(R.id.tvContent);

edtKeyword = findViewById(R.id.edtKeyword);

btnSearch = findViewById(R.id.btnSearch);

}

public void hightStr(String hlStr, String srcString){

tvContent.setText("");

String hlLower = hlStr.toLowerCase();

int lastEnd = 0;

SpannableString spannableString = new SpannableString(srcString);

for(int i = 0; i <= srcString.length() - hlStr.length(); i++){

if(srcString.substring(i, i + hlStr.length()).toLowerCase().equals(hlLower)){

spannableString.setSpan(new ForegroundColorSpan(Color.RED), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

spannableString.setSpan(new BackgroundColorSpan(Color.YELLOW), i, i + hlStr.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

}

tvContent.append(spannableString);

}

安卓设置系统语言的方法

分类：Android, Java 阅读 (2,698) 已关闭评论

11月 262020

本文基于Android8.1系统，应用需要为系统应用

实现方法参考此链接：https://blog.csdn.net/weijuantang/article/details/41379027

通过反射实现设置语言功能的函数：

    private void updateLanguage(Locale locale) {
        Log.d("ANDROID_LAB", locale.toString());
        try {
            Object objIAm, objActMagNative;

            Class ClzAm = ActivityManager.class;
            ActivityManager am = (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);
            Class clzIAM = Class.forName("android.app.IActivityManager");
            Class clzAmNative = Class.forName("android.app.ActivityManagerNative");
            Method mtdActMagNative$getDefault = clzAmNative.getDeclaredMethod("getDefault");
// IActivityManager iActMag = ActivityManagerNative.getDefault();

            Method getIamMethod = ClzAm.getMethod("getService");
            objIAm = getIamMethod.invoke(am);

            ////objIAm = mtdActMagNative$getDefault.invoke(clzAmNative);
// Configuration config = iActMag.getConfiguration();
            Method mtdIActMag$getConfiguration = clzIAM.getDeclaredMethod("getConfiguration");
            Configuration config = (Configuration) mtdIActMag$getConfiguration.invoke(objIAm);
            config.locale = locale;
            config.setLocales(new LocaleList(locale));
// iActMag.updateConfiguration(config);
// 此处需要声明权限:android.permission.CHANGE_CONFIGURATION
// 会重新调用 onCreate();

            Method updatePersistentConfigurationMethod = clzIAM.getMethod("updatePersistentConfiguration", Configuration.class);
            updatePersistentConfigurationMethod.invoke(objIAm, config);

            Class[] clzParams = { Configuration.class };
            Method mtdIActMag$updateConfiguration = clzIAM.getDeclaredMethod(
                    "updateConfiguration", clzParams);
            mtdIActMag$updateConfiguration.invoke(objIAm, config);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

private void updateLanguage(Locale locale) {

Log.d("ANDROID_LAB", locale.toString());

try {

Object objIAm, objActMagNative;

Class ClzAm = ActivityManager.class;

ActivityManager am = (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);

Class clzIAM = Class.forName("android.app.IActivityManager");

Class clzAmNative = Class.forName("android.app.ActivityManagerNative");

Method mtdActMagNative$getDefault = clzAmNative.getDeclaredMethod("getDefault");

// IActivityManager iActMag = ActivityManagerNative.getDefault();

Method getIamMethod = ClzAm.getMethod("getService");

objIAm = getIamMethod.invoke(am);

////objIAm = mtdActMagNative$getDefault.invoke(clzAmNative);

// Configuration config = iActMag.getConfiguration();

Method mtdIActMag$getConfiguration = clzIAM.getDeclaredMethod("getConfiguration");

Configuration config = (Configuration) mtdIActMag$getConfiguration.invoke(objIAm);

config.locale = locale;

config.setLocales(new LocaleList(locale));

// iActMag.updateConfiguration(config);

// 此处需要声明权限:android.permission.CHANGE_CONFIGURATION

// 会重新调用 onCreate();

Method updatePersistentConfigurationMethod = clzIAM.getMethod("updatePersistentConfiguration", Configuration.class);

updatePersistentConfigurationMethod.invoke(objIAm, config);

Class[] clzParams = { Configuration.class };

Method mtdIActMag$updateConfiguration = clzIAM.getDeclaredMethod(

"updateConfiguration", clzParams);

mtdIActMag$updateConfiguration.invoke(objIAm, config);

} catch (Exception e) {

e.printStackTrace();

}

调用方法：

updateLanguage(new Locale("zh", "CN"));
updateLanguage(new Locale("en", "US"));

1 2	updateLanguage(new Locale("zh", "CN")); updateLanguage(new Locale("en", "US"));

Android获取和设置时区

分类：Android, Java 阅读 (4,452) 已关闭评论

11月 262020

本文适用于Android8.0及以上系统，应用必须为系统应用

获取时区列表（>=Android8.0）

import android.content.Context;
import android.content.res.XmlResourceParser;
import android.icu.text.TimeZoneFormat;
import android.icu.text.TimeZoneNames;
import android.os.Build;
import android.text.BidiFormatter;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.TextDirectionHeuristics;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.text.style.TtsSpan;
import android.util.Log;
import android.view.View;

import androidx.annotation.RequiresApi;
import androidx.core.text.TextDirectionHeuristicsCompat;

import com.zht.car.zhtsettings.R;

import org.xmlpull.v1.XmlPullParserException;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;

@RequiresApi(api = Build.VERSION_CODES.O)
public class ZoneGetter {
    private static final String XMLTAG_TIMEZONE = "timezone";

    private static final String TAG = "ZoneGetter";

    public static final String KEY_ID = "id";  // value: String

    /**
     * @deprecated Use {@link #KEY_DISPLAY_LABEL} instead.
     */
    @Deprecated
    public static final String KEY_DISPLAYNAME = "name";  // value: String

    public static final String KEY_DISPLAY_LABEL = "display_label"; // value: CharSequence

    /**
     * @deprecated Use {@link #KEY_OFFSET_LABEL} instead.
     */
    @Deprecated
    public static final String KEY_GMT = "gmt";  // value: String
    public static final String KEY_OFFSET = "offset";  // value: int (Integer)
    public static final String KEY_OFFSET_LABEL = "offset_label";  // value: CharSequence

    public static List<Map<String, Object>> getZonesList(Context context) {
        final Locale locale = context.getResources().getConfiguration().locale;
        final Date now = new Date();
        final TimeZoneNames timeZoneNames = TimeZoneNames.getInstance(locale);
        final ZoneGetterData data = new ZoneGetterData(context);

        // Work out whether the display names we would show by default would be ambiguous.
        final boolean useExemplarLocationForLocalNames =
                shouldUseExemplarLocationForLocalNames(data, timeZoneNames);

        // Generate the list of zone entries to return.
        List<Map<String, Object>> zones = new ArrayList<Map<String, Object>>();
        for (int i = 0; i < data.zoneCount; i++) {
            TimeZone tz = data.timeZones[i];
            CharSequence gmtOffsetText = data.gmtOffsetTexts[i];

            CharSequence displayName = getTimeZoneDisplayName(data, timeZoneNames,
                    useExemplarLocationForLocalNames, tz, data.olsonIdsToDisplay[i]);
            if (TextUtils.isEmpty(displayName)) {
                displayName = gmtOffsetText;
            }

            int offsetMillis = tz.getOffset(now.getTime());
            Map<String, Object> displayEntry =
                    createDisplayEntry(tz, gmtOffsetText, displayName, offsetMillis);
            zones.add(displayEntry);
        }
        return zones;
    }

    private static boolean shouldUseExemplarLocationForLocalNames(ZoneGetterData data,
                                                                  TimeZoneNames timeZoneNames) {
        final Set<CharSequence> localZoneNames = new HashSet<>();
        final Date now = new Date();
        for (int i = 0; i < data.zoneCount; i++) {
            final String olsonId = data.olsonIdsToDisplay[i];
            if (data.localZoneIds.contains(olsonId)) {
                final TimeZone tz = data.timeZones[i];
                CharSequence displayName = getZoneLongName(timeZoneNames, tz, now);
                if (displayName == null) {
                    displayName = data.gmtOffsetTexts[i];
                }
                final boolean nameIsUnique = localZoneNames.add(displayName);
                if (!nameIsUnique) {
                    return true;
                }
            }
        }

        return false;
    }

    private static Map<String, Object> createDisplayEntry(
            TimeZone tz, CharSequence gmtOffsetText, CharSequence displayName, int offsetMillis) {
        Map<String, Object> map = new HashMap<>();
        map.put(KEY_ID, tz.getID());
        map.put(KEY_DISPLAYNAME, displayName.toString());
        map.put(KEY_DISPLAY_LABEL, displayName);
        map.put(KEY_GMT, gmtOffsetText.toString());
        map.put(KEY_OFFSET_LABEL, gmtOffsetText);
        map.put(KEY_OFFSET, offsetMillis);
        return map;
    }

    private static CharSequence getTimeZoneDisplayName(ZoneGetterData data,
                                                       TimeZoneNames timeZoneNames, boolean useExemplarLocationForLocalNames, TimeZone tz,
                                                       String olsonId) {
        final Date now = new Date();
        final boolean isLocalZoneId = data.localZoneIds.contains(olsonId);
        final boolean preferLongName = isLocalZoneId && !useExemplarLocationForLocalNames;
        String displayName;

        if (preferLongName) {
            displayName = getZoneLongName(timeZoneNames, tz, now);
        } else {
            // Canonicalize the zone ID for ICU. It will only return valid strings for zone IDs
            // that match ICUs zone IDs (which are similar but not guaranteed the same as those
            // in timezones.xml). timezones.xml and related files uses the IANA IDs. ICU IDs are
            // stable and IANA IDs have changed over time so they have drifted.
            // See http://bugs.icu-project.org/trac/ticket/13070 / http://b/36469833.
            String canonicalZoneId = android.icu.util.TimeZone.getCanonicalID(tz.getID());
            if (canonicalZoneId == null) {
                canonicalZoneId = tz.getID();
            }
            displayName = timeZoneNames.getExemplarLocationName(canonicalZoneId);
            if (displayName == null || displayName.isEmpty()) {
                // getZoneExemplarLocation can return null. Fall back to the long name.
                displayName = getZoneLongName(timeZoneNames, tz, now);
            }
        }

        return displayName;
    }

    /**
     * Returns the long name for the timezone for the given locale at the time specified.
     * Can return {@code null}.
     */
    private static String getZoneLongName(TimeZoneNames names, TimeZone tz, Date now) {
        final TimeZoneNames.NameType nameType =
                tz.inDaylightTime(now) ? TimeZoneNames.NameType.LONG_DAYLIGHT
                        : TimeZoneNames.NameType.LONG_STANDARD;
        return names.getDisplayName(tz.getID(), nameType, now.getTime());
    }


    private static List<String> readTimezonesToDisplay(Context context) {
        List<String> olsonIds = new ArrayList<String>();
        try (XmlResourceParser xrp = context.getResources().getXml(R.xml.timezones)) {
            while (xrp.next() != XmlResourceParser.START_TAG) {
                continue;
            }
            xrp.next();
            while (xrp.getEventType() != XmlResourceParser.END_TAG) {
                while (xrp.getEventType() != XmlResourceParser.START_TAG) {
                    if (xrp.getEventType() == XmlResourceParser.END_DOCUMENT) {
                        return olsonIds;
                    }
                    xrp.next();
                }
                if (xrp.getName().equals(XMLTAG_TIMEZONE)) {
                    String olsonId = xrp.getAttributeValue(0);
                    olsonIds.add(olsonId);
                }
                while (xrp.getEventType() != XmlResourceParser.END_TAG) {
                    xrp.next();
                }
                xrp.next();
            }
        } catch (XmlPullParserException xppe) {
            Log.e(TAG, "Ill-formatted timezones.xml file");
        } catch (java.io.IOException ioe) {
            Log.e(TAG, "Unable to read timezones.xml file");
        }
        return olsonIds;
    }

    /**
     * Get the GMT offset text label for the given time zone, in the format "GMT-08:00". This will
     * also add TTS spans to give hints to the text-to-speech engine for the type of data it is.
     *
     * @param tzFormatter The timezone formatter to use.
     * @param locale The locale which the string is displayed in. This should be the same as the
     *               locale of the time zone formatter.
     * @param tz Time zone to get the GMT offset from.
     * @param now The current time, used to tell whether daylight savings is active.
     * @return A CharSequence suitable for display as the offset label of {@code tz}.
     */
    private static CharSequence getGmtOffsetText(TimeZoneFormat tzFormatter, Locale locale,
                                                 TimeZone tz, Date now) {
        final SpannableStringBuilder builder = new SpannableStringBuilder();

        final String gmtPattern = tzFormatter.getGMTPattern();
        final int placeholderIndex = gmtPattern.indexOf("{0}");
        final String gmtPatternPrefix, gmtPatternSuffix;
        if (placeholderIndex == -1) {
            // Bad pattern. Replace with defaults.
            gmtPatternPrefix = "GMT";
            gmtPatternSuffix = "";
        } else {
            gmtPatternPrefix = gmtPattern.substring(0, placeholderIndex);
            gmtPatternSuffix = gmtPattern.substring(placeholderIndex + 3); // After the "{0}".
        }

        if (!gmtPatternPrefix.isEmpty()) {
            appendWithTtsSpan(builder, gmtPatternPrefix,
                    new TtsSpan.TextBuilder(gmtPatternPrefix).build());
        }

        int offsetMillis = tz.getOffset(now.getTime());
        final boolean negative = offsetMillis < 0;
        final TimeZoneFormat.GMTOffsetPatternType patternType;
        if (negative) {
            offsetMillis = -offsetMillis;
            patternType = TimeZoneFormat.GMTOffsetPatternType.NEGATIVE_HM;
        } else {
            patternType = TimeZoneFormat.GMTOffsetPatternType.POSITIVE_HM;
        }
        final String gmtOffsetPattern = tzFormatter.getGMTOffsetPattern(patternType);
        final String localizedDigits = tzFormatter.getGMTOffsetDigits();

        final int offsetHours = (int) (offsetMillis / DateUtils.HOUR_IN_MILLIS);
        final int offsetMinutes = (int) (offsetMillis / DateUtils.MINUTE_IN_MILLIS);
        final int offsetMinutesRemaining = Math.abs(offsetMinutes) % 60;

        for (int i = 0; i < gmtOffsetPattern.length(); i++) {
            char c = gmtOffsetPattern.charAt(i);
            if (c == '+' || c == '-' || c == '\u2212' /* MINUS SIGN */) {
                final String sign = String.valueOf(c);
                appendWithTtsSpan(builder, sign, new TtsSpan.VerbatimBuilder(sign).build());
            } else if (c == 'H' || c == 'm') {
                final int numDigits;
                if (i + 1 < gmtOffsetPattern.length() && gmtOffsetPattern.charAt(i + 1) == c) {
                    numDigits = 2;
                    i++; // Skip the next formatting character.
                } else {
                    numDigits = 1;
                }
                final int number;
                final String unit;
                if (c == 'H') {
                    number = offsetHours;
                    unit = "hour";
                } else { // c == 'm'
                    number = offsetMinutesRemaining;
                    unit = "minute";
                }
                appendWithTtsSpan(builder, formatDigits(number, numDigits, localizedDigits),
                        new TtsSpan.MeasureBuilder().setNumber(number).setUnit(unit).build());
            } else {
                builder.append(c);
            }
        }

        if (!gmtPatternSuffix.isEmpty()) {
            appendWithTtsSpan(builder, gmtPatternSuffix,
                    new TtsSpan.TextBuilder(gmtPatternSuffix).build());
        }

        CharSequence gmtText = new SpannableString(builder);

        // Ensure that the "GMT+" stays with the "00:00" even if the digits are RTL.
        final BidiFormatter bidiFormatter = BidiFormatter.getInstance();
        boolean isRtl = TextUtils.getLayoutDirectionFromLocale(locale) == View.LAYOUT_DIRECTION_RTL;
        gmtText = bidiFormatter.unicodeWrap(gmtText,
                isRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR);
        return gmtText;
    }

    private static void appendWithTtsSpan(SpannableStringBuilder builder, CharSequence content,
                                          TtsSpan span) {
        int start = builder.length();
        builder.append(content);
        builder.setSpan(span, start, builder.length(), 0);
    }

    // Input must be positive. minDigits must be 1 or 2.
    private static String formatDigits(int input, int minDigits, String localizedDigits) {
        final int tens = input / 10;
        final int units = input % 10;
        StringBuilder builder = new StringBuilder(minDigits);
        if (input >= 10 || minDigits == 2) {
            builder.append(localizedDigits.charAt(tens));
        }
        builder.append(localizedDigits.charAt(units));
        return builder.toString();
    }

    private static final class ZoneGetterData {
        public final String[] olsonIdsToDisplay;
        public final CharSequence[] gmtOffsetTexts;
        public final TimeZone[] timeZones;
        public final Set<String> localZoneIds;
        public final int zoneCount;

        public ZoneGetterData(Context context) {
            final Locale locale = context.getResources().getConfiguration().locale;
            final TimeZoneFormat tzFormatter = TimeZoneFormat.getInstance(locale);
            final Date now = new Date();
            final List<String> olsonIdsToDisplayList = readTimezonesToDisplay(context);

            // Load all the data needed to display time zones
            zoneCount = olsonIdsToDisplayList.size();
            olsonIdsToDisplay = new String[zoneCount];
            timeZones = new TimeZone[zoneCount];
            gmtOffsetTexts = new CharSequence[zoneCount];
            for (int i = 0; i < zoneCount; i++) {
                final String olsonId = olsonIdsToDisplayList.get(i);
                olsonIdsToDisplay[i] = olsonId;
                final TimeZone tz = TimeZone.getTimeZone(olsonId);
                timeZones[i] = tz;
                gmtOffsetTexts[i] = getGmtOffsetText(tzFormatter, locale, tz, now);
            }

            // Create a lookup of local zone IDs.
            localZoneIds = new HashSet<String>();
            //TODO:
//            for (String olsonId : libcore.icu.TimeZoneNames.forLocale(locale)) {
//                localZoneIds.add(olsonId);
//            }
        }
    }
}

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import android.content.Context;

import android.content.res.XmlResourceParser;

import android.icu.text.TimeZoneFormat;

import android.icu.text.TimeZoneNames;

import android.os.Build;

import android.text.BidiFormatter;

import android.text.SpannableString;

import android.text.SpannableStringBuilder;

import android.text.TextDirectionHeuristics;

import android.text.TextUtils;

import android.text.format.DateUtils;

import android.text.style.TtsSpan;

import android.util.Log;

import android.view.View;

import androidx.annotation.RequiresApi;

import androidx.core.text.TextDirectionHeuristicsCompat;

import com.zht.car.zhtsettings.R;

import org.xmlpull.v1.XmlPullParserException;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Locale;

import java.util.Map;

import java.util.Set;

import java.util.TimeZone;

@RequiresApi(api = Build.VERSION_CODES.O)

public class ZoneGetter {

private static final String XMLTAG_TIMEZONE = "timezone";

private static final String TAG = "ZoneGetter";

public static final String KEY_ID = "id"; // value: String

/**

* @deprecated Use {@link #KEY_DISPLAY_LABEL} instead.

@Deprecated

public static final String KEY_DISPLAYNAME = "name"; // value: String

public static final String KEY_DISPLAY_LABEL = "display_label"; // value: CharSequence

/**

* @deprecated Use {@link #KEY_OFFSET_LABEL} instead.

@Deprecated

public static final String KEY_GMT = "gmt"; // value: String

public static final String KEY_OFFSET = "offset"; // value: int (Integer)

public static final String KEY_OFFSET_LABEL = "offset_label"; // value: CharSequence

public static List<Map<String, Object>> getZonesList(Context context) {

final Locale locale = context.getResources().getConfiguration().locale;

final Date now = new Date();

final TimeZoneNames timeZoneNames = TimeZoneNames.getInstance(locale);

final ZoneGetterData data = new ZoneGetterData(context);

// Work out whether the display names we would show by default would be ambiguous.

final boolean useExemplarLocationForLocalNames =

shouldUseExemplarLocationForLocalNames(data, timeZoneNames);

// Generate the list of zone entries to return.

List<Map<String, Object>> zones = new ArrayList<Map<String, Object>>();

for (int i = 0; i < data.zoneCount; i++) {

TimeZone tz = data.timeZones[i];

CharSequence gmtOffsetText = data.gmtOffsetTexts[i];

CharSequence displayName = getTimeZoneDisplayName(data, timeZoneNames,

useExemplarLocationForLocalNames, tz, data.olsonIdsToDisplay[i]);

if (TextUtils.isEmpty(displayName)) {

displayName = gmtOffsetText;

}

int offsetMillis = tz.getOffset(now.getTime());

Map<String, Object> displayEntry =

createDisplayEntry(tz, gmtOffsetText, displayName, offsetMillis);

zones.add(displayEntry);

}

return zones;

}

private static boolean shouldUseExemplarLocationForLocalNames(ZoneGetterData data,

TimeZoneNames timeZoneNames) {

final Set<CharSequence> localZoneNames = new HashSet<>();

final Date now = new Date();

for (int i = 0; i < data.zoneCount; i++) {

final String olsonId = data.olsonIdsToDisplay[i];

if (data.localZoneIds.contains(olsonId)) {

final TimeZone tz = data.timeZones[i];

CharSequence displayName = getZoneLongName(timeZoneNames, tz, now);

if (displayName == null) {

displayName = data.gmtOffsetTexts[i];

}

final boolean nameIsUnique = localZoneNames.add(displayName);

if (!nameIsUnique) {

return true;

}

return false;

}

private static Map<String, Object> createDisplayEntry(

TimeZone tz, CharSequence gmtOffsetText, CharSequence displayName, int offsetMillis) {

Map<String, Object> map = new HashMap<>();

map.put(KEY_ID, tz.getID());

map.put(KEY_DISPLAYNAME, displayName.toString());

map.put(KEY_DISPLAY_LABEL, displayName);

map.put(KEY_GMT, gmtOffsetText.toString());

map.put(KEY_OFFSET_LABEL, gmtOffsetText);

map.put(KEY_OFFSET, offsetMillis);

return map;

}

private static CharSequence getTimeZoneDisplayName(ZoneGetterData data,

TimeZoneNames timeZoneNames, boolean useExemplarLocationForLocalNames, TimeZone tz,

String olsonId) {

final Date now = new Date();

final boolean isLocalZoneId = data.localZoneIds.contains(olsonId);

final boolean preferLongName = isLocalZoneId && !useExemplarLocationForLocalNames;

String displayName;

if (preferLongName) {

displayName = getZoneLongName(timeZoneNames, tz, now);

} else {

// Canonicalize the zone ID for ICU. It will only return valid strings for zone IDs

// that match ICUs zone IDs (which are similar but not guaranteed the same as those

// in timezones.xml). timezones.xml and related files uses the IANA IDs. ICU IDs are

// stable and IANA IDs have changed over time so they have drifted.

// See http://bugs.icu-project.org/trac/ticket/13070 / http://b/36469833.

String canonicalZoneId = android.icu.util.TimeZone.getCanonicalID(tz.getID());

if (canonicalZoneId == null) {

canonicalZoneId = tz.getID();

}

displayName = timeZoneNames.getExemplarLocationName(canonicalZoneId);

if (displayName == null || displayName.isEmpty()) {

// getZoneExemplarLocation can return null. Fall back to the long name.

displayName = getZoneLongName(timeZoneNames, tz, now);

}

return displayName;

}

/**

* Returns the long name for the timezone for the given locale at the time specified.

* Can return {@code null}.

private static String getZoneLongName(TimeZoneNames names, TimeZone tz, Date now) {

final TimeZoneNames.NameType nameType =

tz.inDaylightTime(now) ? TimeZoneNames.NameType.LONG_DAYLIGHT

: TimeZoneNames.NameType.LONG_STANDARD;

return names.getDisplayName(tz.getID(), nameType, now.getTime());

}

private static List<String> readTimezonesToDisplay(Context context) {

List<String> olsonIds = new ArrayList<String>();

try (XmlResourceParser xrp = context.getResources().getXml(R.xml.timezones)) {

while (xrp.next() != XmlResourceParser.START_TAG) {

continue;

}

xrp.next();

while (xrp.getEventType() != XmlResourceParser.END_TAG) {

while (xrp.getEventType() != XmlResourceParser.START_TAG) {

if (xrp.getEventType() == XmlResourceParser.END_DOCUMENT) {

return olsonIds;

}

xrp.next();

}

if (xrp.getName().equals(XMLTAG_TIMEZONE)) {

String olsonId = xrp.getAttributeValue(0);

olsonIds.add(olsonId);

}

while (xrp.getEventType() != XmlResourceParser.END_TAG) {

xrp.next();

}

xrp.next();

}

} catch (XmlPullParserException xppe) {

Log.e(TAG, "Ill-formatted timezones.xml file");

} catch (java.io.IOException ioe) {

Log.e(TAG, "Unable to read timezones.xml file");

}

return olsonIds;

}

/**

* Get the GMT offset text label for the given time zone, in the format "GMT-08:00". This will

* also add TTS spans to give hints to the text-to-speech engine for the type of data it is.

* @param tzFormatter The timezone formatter to use.

* @param locale The locale which the string is displayed in. This should be the same as the

* locale of the time zone formatter.

* @param tz Time zone to get the GMT offset from.

* @param now The current time, used to tell whether daylight savings is active.

* @return A CharSequence suitable for display as the offset label of {@code tz}.

private static CharSequence getGmtOffsetText(TimeZoneFormat tzFormatter, Locale locale,

TimeZone tz, Date now) {

final SpannableStringBuilder builder = new SpannableStringBuilder();

final String gmtPattern = tzFormatter.getGMTPattern();

final int placeholderIndex = gmtPattern.indexOf("{0}");

final String gmtPatternPrefix, gmtPatternSuffix;

if (placeholderIndex == -1) {

// Bad pattern. Replace with defaults.

gmtPatternPrefix = "GMT";

gmtPatternSuffix = "";

} else {

gmtPatternPrefix = gmtPattern.substring(0, placeholderIndex);

gmtPatternSuffix = gmtPattern.substring(placeholderIndex + 3); // After the "{0}".

}

if (!gmtPatternPrefix.isEmpty()) {

appendWithTtsSpan(builder, gmtPatternPrefix,

new TtsSpan.TextBuilder(gmtPatternPrefix).build());

}

int offsetMillis = tz.getOffset(now.getTime());

final boolean negative = offsetMillis < 0;

final TimeZoneFormat.GMTOffsetPatternType patternType;

if (negative) {

offsetMillis = -offsetMillis;

patternType = TimeZoneFormat.GMTOffsetPatternType.NEGATIVE_HM;

} else {

patternType = TimeZoneFormat.GMTOffsetPatternType.POSITIVE_HM;

}

final String gmtOffsetPattern = tzFormatter.getGMTOffsetPattern(patternType);

final String localizedDigits = tzFormatter.getGMTOffsetDigits();

final int offsetHours = (int) (offsetMillis / DateUtils.HOUR_IN_MILLIS);

final int offsetMinutes = (int) (offsetMillis / DateUtils.MINUTE_IN_MILLIS);

final int offsetMinutesRemaining = Math.abs(offsetMinutes) % 60;

for (int i = 0; i < gmtOffsetPattern.length(); i++) {

char c = gmtOffsetPattern.charAt(i);

if (c == '+' || c == '-' || c == '\u2212' /* MINUS SIGN */) {

final String sign = String.valueOf(c);

appendWithTtsSpan(builder, sign, new TtsSpan.VerbatimBuilder(sign).build());

} else if (c == 'H' || c == 'm') {

final int numDigits;

if (i + 1 < gmtOffsetPattern.length() && gmtOffsetPattern.charAt(i + 1) == c) {

numDigits = 2;

i++; // Skip the next formatting character.

} else {

numDigits = 1;

}

final int number;

final String unit;

if (c == 'H') {

number = offsetHours;

unit = "hour";

} else { // c == 'm'

number = offsetMinutesRemaining;

unit = "minute";

}

appendWithTtsSpan(builder, formatDigits(number, numDigits, localizedDigits),

new TtsSpan.MeasureBuilder().setNumber(number).setUnit(unit).build());

} else {

builder.append(c);

}

if (!gmtPatternSuffix.isEmpty()) {

appendWithTtsSpan(builder, gmtPatternSuffix,

new TtsSpan.TextBuilder(gmtPatternSuffix).build());

}

CharSequence gmtText = new SpannableString(builder);

// Ensure that the "GMT+" stays with the "00:00" even if the digits are RTL.

final BidiFormatter bidiFormatter = BidiFormatter.getInstance();

boolean isRtl = TextUtils.getLayoutDirectionFromLocale(locale) == View.LAYOUT_DIRECTION_RTL;

gmtText = bidiFormatter.unicodeWrap(gmtText,

isRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR);

return gmtText;

}

private static void appendWithTtsSpan(SpannableStringBuilder builder, CharSequence content,

TtsSpan span) {

int start = builder.length();

builder.append(content);

builder.setSpan(span, start, builder.length(), 0);

}

// Input must be positive. minDigits must be 1 or 2.

private static String formatDigits(int input, int minDigits, String localizedDigits) {

final int tens = input / 10;

final int units = input % 10;

StringBuilder builder = new StringBuilder(minDigits);

if (input >= 10 || minDigits == 2) {

builder.append(localizedDigits.charAt(tens));

}

builder.append(localizedDigits.charAt(units));

return builder.toString();

}

private static final class ZoneGetterData {

public final String[] olsonIdsToDisplay;

public final CharSequence[] gmtOffsetTexts;

public final TimeZone[] timeZones;

public final Set<String> localZoneIds;

public final int zoneCount;

public ZoneGetterData(Context context) {

final Locale locale = context.getResources().getConfiguration().locale;

final TimeZoneFormat tzFormatter = TimeZoneFormat.getInstance(locale);

final Date now = new Date();

final List<String> olsonIdsToDisplayList = readTimezonesToDisplay(context);

// Load all the data needed to display time zones

zoneCount = olsonIdsToDisplayList.size();

olsonIdsToDisplay = new String[zoneCount];

timeZones = new TimeZone[zoneCount];

gmtOffsetTexts = new CharSequence[zoneCount];

for (int i = 0; i < zoneCount; i++) {

final String olsonId = olsonIdsToDisplayList.get(i);

olsonIdsToDisplay[i] = olsonId;

final TimeZone tz = TimeZone.getTimeZone(olsonId);

timeZones[i] = tz;

gmtOffsetTexts[i] = getGmtOffsetText(tzFormatter, locale, tz, now);

}

// Create a lookup of local zone IDs.

localZoneIds = new HashSet<String>();

//TODO:

// for (String olsonId : libcore.icu.TimeZoneNames.forLocale(locale)) {

// localZoneIds.add(olsonId);

// }

}

设置时区：

                AlarmManager am = (AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE);
                am.setTimeZone(mTimeZoneList.get(position).get(ZoneGetter.KEY_ID).toString());
                getContext().sendBroadcast(new Intent(Intent.ACTION_TIME_CHANGED));

AlarmManager am = (AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE);

am.setTimeZone(mTimeZoneList.get(position).get(ZoneGetter.KEY_ID).toString());

getContext().sendBroadcast(new Intent(Intent.ACTION_TIME_CHANGED));

获取时区：

    public static String getTimeZoneText(TimeZone tz, boolean includeName) {
        Date now = new Date();

        SimpleDateFormat gmtFormatter = new SimpleDateFormat("ZZZZ");
        gmtFormatter.setTimeZone(tz);
        String gmtString = gmtFormatter.format(now);
        BidiFormatter bidiFormatter = BidiFormatter.getInstance();
        Locale l = Locale.getDefault();
        boolean isRtl = TextUtils.getLayoutDirectionFromLocale(l) == View.LAYOUT_DIRECTION_RTL;
        gmtString = bidiFormatter.unicodeWrap(gmtString,
                isRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR);

        if (!includeName) {
            return gmtString;
        }

        return gmtString;
    }

public static String getTimeZoneText(TimeZone tz, boolean includeName) {

Date now = new Date();

SimpleDateFormat gmtFormatter = new SimpleDateFormat("ZZZZ");

gmtFormatter.setTimeZone(tz);

String gmtString = gmtFormatter.format(now);

BidiFormatter bidiFormatter = BidiFormatter.getInstance();

Locale l = Locale.getDefault();

boolean isRtl = TextUtils.getLayoutDirectionFromLocale(l) == View.LAYOUT_DIRECTION_RTL;

gmtString = bidiFormatter.unicodeWrap(gmtString,

isRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR);

if (!includeName) {

return gmtString;

}

return gmtString;

}

Android修改系统24/12小时制

分类：Android, Java 阅读 (2,680) 已关闭评论

11月 242020

基于Android8.1系统测试

需要是系统应用

需要在Manifest.xml中声明如下权限：

    <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
    <uses-permission android:name="android.permission.WRITE_SETTINGS" />

1 2	<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" /> <uses-permission android:name="android.permission.WRITE_SETTINGS" />

重新定义一下系统常量（在系统里是hide的）

    public static final String EXTRA_TIME_PREF_24_HOUR_FORMAT =
            "android.intent.extra.TIME_PREF_24_HOUR_FORMAT";
    public static final int EXTRA_TIME_PREF_VALUE_USE_12_HOUR = 0;
    public static final int EXTRA_TIME_PREF_VALUE_USE_24_HOUR = 1;

public static final String EXTRA_TIME_PREF_24_HOUR_FORMAT =

"android.intent.extra.TIME_PREF_24_HOUR_FORMAT";

public static final int EXTRA_TIME_PREF_VALUE_USE_12_HOUR = 0;

public static final int EXTRA_TIME_PREF_VALUE_USE_24_HOUR = 1;

读取当前设置值：

String hour24 = Settings.System.getString(getContext().getContentResolver(), Settings.System.TIME_12_24);

1	String hour24 = Settings.System.getString(getContext().getContentResolver(), Settings.System.TIME_12_24);

设置新的值：

        mLayout24h.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mSwitch24h.setChecked(!mSwitch24h.isChecked());
                String newValue = mSwitch24h.isChecked() ? "24" : "12";
                Log.d(LOG_TAG, "newValue: " + newValue);
                Settings.System.putString(getContext().getContentResolver(), Settings.System.TIME_12_24, newValue);

                Intent timeChanged = new Intent(Intent.ACTION_TIME_CHANGED);
                int timeFormatPreference =
                        mSwitch24h.isChecked() ? EXTRA_TIME_PREF_VALUE_USE_24_HOUR
                                : EXTRA_TIME_PREF_VALUE_USE_12_HOUR;
                timeChanged.putExtra(EXTRA_TIME_PREF_24_HOUR_FORMAT, timeFormatPreference);
                getContext().sendBroadcast(timeChanged);
            }
        });

mLayout24h.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

mSwitch24h.setChecked(!mSwitch24h.isChecked());

String newValue = mSwitch24h.isChecked() ? "24" : "12";

Log.d(LOG_TAG, "newValue: " + newValue);

Settings.System.putString(getContext().getContentResolver(), Settings.System.TIME_12_24, newValue);

Intent timeChanged = new Intent(Intent.ACTION_TIME_CHANGED);

int timeFormatPreference =

mSwitch24h.isChecked() ? EXTRA_TIME_PREF_VALUE_USE_24_HOUR

: EXTRA_TIME_PREF_VALUE_USE_12_HOUR;

timeChanged.putExtra(EXTRA_TIME_PREF_24_HOUR_FORMAT, timeFormatPreference);

getContext().sendBroadcast(timeChanged);

}

});

密码保护：树莓派小称需要安装的东西

分类：Others, Others 阅读 (1,289) 已关闭评论

9月 292020

greenDao缓存踩坑

分类：Android, Java 阅读 (1,760) 已关闭评论

9月 042020

　　今天在执行如下操作时发现一个奇怪的问题，首先使用update更新数据库，然后select数据进行上传，结果select出来的数据总是旧数据。查了一天更新和上传那块的代码也没发现什么问题，后来发现是greenDao的问题。

　　问题：greenDao中创建DaoSession对象时默认是使用缓存的，这样select出来的数据可能就不是最新的

　　解决方法：

　　方法一：创建DaoSession对象的时候传入IdentityScopeType.None参数默认禁止缓存，示例如下：

        mDaoMaster = new DaoMaster(db);
        mDaoSession = mDaoMaster.newSession(IdentityScopeType.None);

1 2	mDaoMaster = new DaoMaster(db); mDaoSession = mDaoMaster.newSession(IdentityScopeType.None);

　　方法二：在select的时候执行一下DaoSession对象的clear方法（注：本方法笔者未验证是否有其他问题，请谨慎使用），如下：

getDaoSession().clear();;

1	getDaoSession().clear();;

关于Android系统栏中back和home键的实现

分类：Android, Java 阅读 (2,911) 已关闭评论

8月 252020

本文基于Android8.1系统编写

一、背景

　　今天想实现自定义的back和home键，比着葫芦画瓢，把back和home键的部局抄过来了。但怎么也没找到back和home键的java功能实现部分。

后来度娘了一下才找到实现的原理。

　　参考链接：http://blog.chinaunix.net/uid-701715-id-3054850.html

　　自己也记录一下

二、按钮的组件类KeyButtonView

　　在部局中可以看到，back和home键用了一个自定义view，开始我还以为是为了实现按钮的动画效果才自定义了一个这个view，现在发现自己天真了！

　　KeyButtonView的核心在于，他定义了一个可设置的部局属性keyCode，用于设置按钮对应的键，如下back键的部局代码：

<com.android.systemui.statusbar.policy.KeyButtonView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res-auto"
    android:id="@+id/back"
    android:layout_width="@dimen/navigation_key_width"
    android:layout_height="match_parent"
    android:layout_weight="0"
    systemui:keyCode="4"
    android:scaleType="fitCenter"
    android:contentDescription="@string/accessibility_back"
    android:paddingTop="15dp"
    android:paddingBottom="15dp"
    android:paddingStart="@dimen/navigation_key_padding"
    android:paddingEnd="@dimen/navigation_key_padding"

<com.android.systemui.statusbar.policy.KeyButtonView

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:systemui="http://schemas.android.com/apk/res-auto"

android:id="@+id/back"

android:layout_width="@dimen/navigation_key_width"

android:layout_height="match_parent"

android:layout_weight="0"

systemui:keyCode="4"

android:scaleType="fitCenter"

android:contentDescription="@string/accessibility_back"

android:paddingTop="15dp"

android:paddingBottom="15dp"

android:paddingStart="@dimen/navigation_key_padding"

android:paddingEnd="@dimen/navigation_key_padding"

　　keyCode=”4″对应的为KeyEvent.KEYCODE_BACK键

　　在KeyButtonView的构造函数中，读取并保存了这个属性：

    public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs);

        //...省略前面的代码
        mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);
　　//...省略后面的代码
    }

public KeyButtonView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs);

//...省略前面的代码

mCode = a.getInteger(R.styleable.KeyButtonView_keyCode, 0);

　　//...省略后面的代码

}

　　如此，在部局文件中设置的keyCode读到了类中

三、模拟发送按键

　　原理是，拦截onTouch事件，当按钮按下时发送keyCode的ACTION_DOWN操作，当按钮弹开时发送keyCode的ACTION_UP操作，完成一次按键的操作。

    public boolean onTouchEvent(MotionEvent ev) {
　　//...省略部分代码

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mDownTime = SystemClock.uptimeMillis();
                mLongClicked = false;
                setPressed(true);
                if (mCode != 0) {
                    sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);
                } else {
                    // Provide the same haptic feedback that the system offers for virtual keys.
                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
                }
                playSoundEffect(SoundEffectConstants.CLICK);
                removeCallbacks(mCheckLongPress);
                postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());
                break;
            case MotionEvent.ACTION_MOVE:
                //...省略
            case MotionEvent.ACTION_CANCEL:
　　　　//...省略
                break;
            case MotionEvent.ACTION_UP:
                final boolean doIt = isPressed() && !mLongClicked;
                setPressed(false);
                // Always send a release ourselves because it doesn't seem to be sent elsewhere
                // and it feels weird to sometimes get a release haptic and other times not.
                if ((SystemClock.uptimeMillis() - mDownTime) > 150 && !mLongClicked) {
                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY_RELEASE);
                }
                if (mCode != 0) {
                    if (doIt) {
                        sendEvent(KeyEvent.ACTION_UP, 0);
                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
                    } else {
                        sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);
                    }
                } else {
                    // no key code, just a regular ImageView
                    if (doIt && mOnClickListener != null) {
                        mOnClickListener.onClick(this);
                        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
                    }
                }
                removeCallbacks(mCheckLongPress);
                break;
        }

        return true;
    }

public boolean onTouchEvent(MotionEvent ev) {

　　//...省略部分代码

switch (action) {

case MotionEvent.ACTION_DOWN:

mDownTime = SystemClock.uptimeMillis();

mLongClicked = false;

setPressed(true);

if (mCode != 0) {

sendEvent(KeyEvent.ACTION_DOWN, 0, mDownTime);

} else {

// Provide the same haptic feedback that the system offers for virtual keys.

performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);

}

playSoundEffect(SoundEffectConstants.CLICK);

removeCallbacks(mCheckLongPress);

postDelayed(mCheckLongPress, ViewConfiguration.getLongPressTimeout());

break;

case MotionEvent.ACTION_MOVE:

//...省略

case MotionEvent.ACTION_CANCEL:

　　　　//...省略

break;

case MotionEvent.ACTION_UP:

final boolean doIt = isPressed() && !mLongClicked;

setPressed(false);

// Always send a release ourselves because it doesn't seem to be sent elsewhere

// and it feels weird to sometimes get a release haptic and other times not.

if ((SystemClock.uptimeMillis() - mDownTime) > 150 && !mLongClicked) {

performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY_RELEASE);

}

if (mCode != 0) {

if (doIt) {

sendEvent(KeyEvent.ACTION_UP, 0);

sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);

} else {

sendEvent(KeyEvent.ACTION_UP, KeyEvent.FLAG_CANCELED);

}

} else {

// no key code, just a regular ImageView

if (doIt && mOnClickListener != null) {

mOnClickListener.onClick(this);

sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);

}

removeCallbacks(mCheckLongPress);

break;

}

return true;

}

　　sendEvent函数，先构造KeyEvent对象，然后通过InputManager发送到系统，代码如下：

    void sendEvent(int action, int flags, long when) {
        //...省略部分代码
        final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;
        final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,
                0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
                flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,
                InputDevice.SOURCE_KEYBOARD);
        InputManager.getInstance().injectInputEvent(ev,
                InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
    }

void sendEvent(int action, int flags, long when) {

//...省略部分代码

final int repeatCount = (flags & KeyEvent.FLAG_LONG_PRESS) != 0 ? 1 : 0;

final KeyEvent ev = new KeyEvent(mDownTime, when, action, mCode, repeatCount,

0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,

flags | KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY,

InputDevice.SOURCE_KEYBOARD);

InputManager.getInstance().injectInputEvent(ev,

InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);

}

关于View类的几个宽度值的区别

分类：Android, Java 阅读 (1,640) 已关闭评论

8月 172020

本文同样适用于高度相关的对应函数

一、几个函数

1. getWidth()

View的实际宽度

2. getMeasuredWidth()

是用setMeasureDimension设置的宽度，这个并不能作为最终的View的宽度来使用，只是在onMeasure的时候用户计算的宽度，只能在这个函数里使用？

3. getMeasuredWidthAndState()

和getMeasuredWidth()类似，但是返回的值包括measuredWidth和MEASURED_SIZE_MASK或者MEASURED_STATE_TOO_SMALL的标志位。

4. getMinimumWidth()

应该是在布局设计时，设置的minWidth属性对应的值或者使用函数setMinimumWidth动态设置的值

5. getSuggestedMinimumWidth()

如果View设置了背景，则取mMinWidth和背景的最小宽度中比较大的一个值。

6. 去除padding后的实际宽度

如果需要考虑padding参数，则去除padding后的实际内容宽度为：

getWidth() – getPaddingLeft – getPaddingRight

二、其他注意事项

1. 在onMeasure函数中不能使用getWidth()和getHeight()函数，此时这两个值都是0

2. MeasureSpec，三种度量规格：

UNSPECIFIED – 未指定
EXACTLY – 固定尺寸
AT_MOST – 最大值

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