Android修改系统24/12小时制

分类：Android, Java 阅读 (2,216)

11月 242020

转载请注明原文地址：http://bcoder.com/java/modify-24-12-hour-mode-in-android

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);

}

});

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