bcoder

慎用addOnGlobalLayoutListener

分类：Android, Java 阅读 (3,083) 已关闭评论

8月 012020

使用如下代码：

		tvMyAccount.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
			@Override
			public void onGlobalLayout() {
				tvMyAccount.setWidth(tvMyAccount.getHeight());
			}
		});

tvMyAccount.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

@Override

public void onGlobalLayout() {

tvMyAccount.setWidth(tvMyAccount.getHeight());

}

});

本来是想实现tvMyAccount这个TextView的宽度始终等于高度。

但是这个会造成UI线程一直在处于忙碌状态，可能会造成如下后果：

1. Android Studio中Layout Inspector无法获取Activity的部局

2. 使用Instrumentation进行自动化测试时，无法测试

addOnGlobalLayoutListener的原理

待整理

为什么greenDao的autoincrement字段必须为Long型

分类：Android, Java 阅读 (1,861) 已关闭评论

7月 292020

一、首先，第一点，为什么不是int型，而是long型

　　没在代码中看出原因，在greenDao的源代码中只是硬性的规定必须使用Long/long型，估计是为了确保自增值的范围足够大？（应该不是）

　　做此限制的代码在文件DaoGenerator/src/org/greenrobot/greendao/generator/Property.java中

        public PropertyBuilder autoincrement() {
            if (!property.primaryKey || property.propertyType != PropertyType.Long) {
                throw new RuntimeException(
                        "AUTOINCREMENT is only available to primary key properties of type long/Long");
            }
            property.pkAutoincrement = true;
            return this;
        }

public PropertyBuilder autoincrement() {

if (!property.primaryKey || property.propertyType != PropertyType.Long) {

throw new RuntimeException(

"AUTOINCREMENT is only available to primary key properties of type long/Long");

}

property.pkAutoincrement = true;

return this;

}

　　在sqlite库的源码中，绑定字段的地方也没有int型相关的参数，只有bindLong和bindDouble、bindString等，和这个有关？

　　sqlite库源码：frameworks\base\core\java\android\database\sqlite\SQLiteProgram.java

二、为什么是Long而不是long？

　　奇怪的是，官方代码中的意思是Long/long都可以，但long是不行的，在插入2条记录的时候就会报ndroid.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: notes.localid错误。

　　这个涉及使用sql语句向数据库的自增字段插入数据的问题，sql语句如下：

　　insert into table(id, name) values(NULL, ‘ldr’);

　　在greenDao中如果成员是long型，则未赋值时返回的是0，如果是Long型，则返回的是null，所以是这个原因？

　　这个涉及的文件是bean类生成的相应的Dao类，比如”NoteBeanDao.java”

LaunchMode应用解析

分类：Android, Java 阅读 (1,040) 已关闭评论

7月 202020

本文基于Android8.1系统进行测试

一、四种LaunchMode

1. standard

默认方式，每次总是新建一个Activity，并放在当前任务的顶端。

2. singleTop(和FLAG_ACTIVITY_SINGLE_TOP标志一样的作用)

如果当前Activity栈的顶部是要打开的Activity，则不新建Activity，而是复用这个Activity，但是intent是通过onNewIntent事件传入（不能通过getIntent得到）。

如果当前Activity栈的顶部不是要打开的Activity，则新建一个Activity

3. singleTask

若被启动的activity的taskAffinity与调起这个activity的不同，则为此Activity新建一个任务，并且此Activity为新建任务的根Activity。若相同，则与普通启动无区别。

若所有task中已经有此Activity，则不新建此Activity，将Activity所在的task调到前台，并清楚Activity到栈顶之间的Activity。

~~三种情况：~~

~~1) Activity存在于某个任务中，且在栈顶，不创建新Activity，已存在的Activity触发onNewIntent~~

~~2)Activity存在于某个任务中，但不在栈顶，不创建新Activity。~~

~~又分两种情况：~~

~~I. 如果栈顶Activity的taskAffinity与此Activity的相同则自动关闭栈顶的Activity，直到此Activity时，触发onNewIntent~~

II. 如果栈顶Activity的taskAffinity与此Activity的不同，并且也是singleTask的，不会自动关闭顶部的Activity，需要手动关闭，直到此Activity时，触发onNewIntent（但是在某些机型上没发现这种情况，而是I中的情况）(目前测试在Android9.0之前是这样的，9.0之后是第I种情况)

~~3)Activity不存在于某个任务中，则在当前任务中新建一个Activity并放在栈顶~~

4. singleInstance

该Activity始终在一个新的任务中创建，并且由该Activity启动的其他Activity始终在另外的任务中。就是说该Activity所在的任务有且只有一个Activity。

二、和FLAG_ATCIVITY_CLEAR_TOP的交互

三、关于taskAffinity

四、其他

1. moveTaskToBack()函数

五、其他参考链接

官方：了解任务和返回堆栈

官方：概览屏幕

Android中一些系统类的研究(ActivityManagerService相关)

分类：Android, Java 阅读 (1,090) 已关闭评论

7月 152020

一. ResolveInfo

　　用于根据intent获取AndroidManifest.xml中的Activity或者Service或者Provider中包含对应的intent-filter的信息？

　　成员包括ActivityInfo、ServieInfo、ProviderInfo、Icon等。

二. ActivityInfo

　　从AndroidManifest.xml中获取的应用的activity或者receiver的信息。

　　AndroidManifest.xml中定义的几种launchMode的定义也在这个类里有对应的定义

public static final int LAUNCH_MULTIPLE = 0; //对应standard
public static final int LAUNCH_SINGLE_TOP = 1; //对应singleTop
public static final int LAUNCH_SINGLE_TASK = 2; //对应singleTask
public static final int LAUNCH_SINGLE_INSTANCE = 3; //对应 singleInstance

三. ActivityStackSupervisor

　　ActivityStack主管，在ActivityManagerService中使用一个ActivityStackSupervisor来管理所有的ActivityStack？

　　通过查找系统所有代码发现，只有在此类的createStack函数中新建了ActivityStack实例（并不是说只创建了一个实例），所以所有的ActivityStack是通过这个对象来管理的。

　　也只有在ActivityManagerService中新建了一个ActivityStackSuperVisor实例，也就是系统中只有一个ActivityStackSupervisor对象

　　另外这个类还负责和PackmanagerService的一些交互，还用于判断进程是否存在(调用ams的函数)，并起动新进程（调用ams的函数）

四. ActivityRecord

　　用于表示Activity的一结构，包括Activity相关的很多信息。

　　一些变量

　　final String taskAffinity – 在AndroidManifest.xml中的Activity节点中定义的taskAffinity

　　1. isResolverActivity()

　　此Activity是不是一个ResolverActivity

　　2. mActivityType可能为以下几种类型

　　static final int APPLICATION_ACTIVITY_TYPE = 0;
　　static final int HOME_ACTIVITY_TYPE = 1;
　　static final int RECENTS_ACTIVITY_TYPE = 2;
　　static final int ASSISTANT_ACTIVITY_TYPE = 3;

五. ActivityStarter

　　诠释如何启动Activity的控制器。

　　根据intent和flag信息，并将这些信息准备相应的activity、Activity Task和Activity Stack的信息。

　　我看了一下代码，主要是根据intent中的flag信息处理相关的Activity、Activity Task和Activity Stack的相关信息。

　　这个类是为了减轻ActivityManagerService的代码量，分离出来一部分逻辑，好让逻辑更清晰一些。

　　一些成员变量：

　　mSourceRecord – 源Activity的ActivityRecord对象

　　mInTask – 调用startActivity的context所在的task，可能为null(比如service中调用或者通知栏调用？)，在启动Activity时在setInitialState函数中传入被赋值

　　mLaunchFlags – 新Activity启动时的一些FLAG标志，通过一系列的计算得到

　　private boolean mLaunchSingleTop; 在setInitialState函数中根据要启动的Activity的ActivityRecord对象的launchMode判断

　　private boolean mLaunchSingleInstance; 在setInitialState函数中根据要启动的Activity的ActivityRecord对象的launchMode判断

　　private boolean mLaunchSingleTask; 在setInitialState函数中根据要启动的Activity的ActivityRecord对象的launchMode判断

　　1. 函数setInitialState()

　　在startActivityUnchecked函数中调用，用于初始化本类中的一些变量。

　　3. 函数computeLaunchingTaskFlags()

　　计算要启动的Activity的task标志

　　4. 函数computeSourceStack

　　计算源Activity所在的stack?

六. ActivityStack

　　Activity栈类，用于管理某个Activity栈。

　　其中：

　　final ArrayList<ActivityRecord> mLRUActivities – 是用于存储正在运行Activity列表，列表中最外面一条记录，是最近使用的Activity

七. TaskRecord

　　final ArrayList<ActivityRecord> mActivities – 此Task中的Activity列表

　　private ActivityStack mStack; – 此Task所在的Activity栈

　　1.函数getBaseIntent()

　　获取任务中根Activity的 intent

　　2.函数getRootActivity()

　　从根Activity往外遍历（列表mActivities），获取非finishing状态的Activity的ActivityRecord对象

八. ResolverActivity

　　继承自Activity，如果startActivity传入的intent对应多个应用，比如intent中打开url链接，但是系统中有多个浏览器应用，将弹出这个Activity让用户选择。

art和Dalvik的一些知识

分类：Android, Java 阅读 (1,182) 已关闭评论

7月 072020

一、Art的诞生

　　Art是在Android4.4系统中加入的，但是默认是不开启的

　　Art和Dalvik的切换是通过指定一个系统设置项来切换的，见art/Android.mk中.PHONY: use-art下面那一段脚本

　　本文摘录片段

adb shell setprop persist.sys.dalvik.vm.lib.2 libdvm.so
adb shell setprop persist.sys.dalvik.vm.lib.2 libart.so
adb shell setprop persist.sys.dalvik.vm.lib.2 libartd.so

adb shell setprop persist.sys.dalvik.vm.lib.2 libdvm.so

adb shell setprop persist.sys.dalvik.vm.lib.2 libart.so

adb shell setprop persist.sys.dalvik.vm.lib.2 libartd.so

　　libdvm.so是DalvikVm的so库

　　libart.so是Art Vm的so库

　　之所以两个能同时切换，是因为他们都实现了JNI_Create_JavaVm的入口函数。

二、Art的崛起

　　在Android4.4加入Art之后，一直是默认没有开启的，直到Android5.0，DalvikVm彻底被删除，art担当大任

　　可以对比下4.4和5.0源码中dalvik/vm下的代码结构

　　http://androidxref.com/4.4_r1/xref/dalvik/vm/

　　http://androidxref.com/5.0.0_r2/xref/dalvik/vm/

　　可以看到从5.0开始，dalvik的代码已经被删除掉了

Android中art虚拟机启动流程

分类：Android, Java 阅读 (1,779) 已关闭评论

7月 072020

本文基于Android8.1系统进行研究

一、启动zygote

在Linux内核启动完成后，首先启动系统的第一个进程init进程

init进程会读取init.rc中的配置文件

其中有Zygote的配置，init进程将启动zygote进程

zygote的入口在app_main.cpp中的main函数中

二、解析传入参数，调用AndroidRuntime的start方法

在app_main.cpp中的main函数中，首先解析传入的相关参数，并通过如下代码进入ZygoteInit的main函数中

    if (zygote) {
        runtime.start("com.android.internal.os.ZygoteInit", args, zygote);
    }

if (zygote) {

runtime.start("com.android.internal.os.ZygoteInit", args, zygote);

}

runtime是AppRuntime的一个实例，AppRuntim继承自AndroidRuntime

start函数定义在AndroidRuntime中，下面是start函数的注释

/*
 * Start the Android runtime.  This involves starting the virtual machine
 * and calling the "static void main(String[] args)" method in the class
 * named by "className".
 *
 * Passes the main function two arguments, the class name and the specified
 * options string.
*
* 翻译：
* 启动Android运行时，包括启动虚拟机，调用className参数对应的main函数
 */

* Start the Android runtime. This involves starting the virtual machine

* and calling the "static void main(String[] args)" method in the class

* named by "className".

* Passes the main function two arguments, the class name and the specified

* options string.

* 翻译：

* 启动Android运行时，包括启动虚拟机，调用className参数对应的main函数

start函数中的这段代码切入到了startVm函数中

    /* start the virtual machine */
    JniInvocation jni_invocation;
    jni_invocation.Init(NULL);
    JNIEnv* env;
    if (startVm(&mJavaVM, &env, zygote) != 0) {
        return;
    }
    onVmCreated(env);

/* start the virtual machine */

JniInvocation jni_invocation;

jni_invocation.Init(NULL);

JNIEnv* env;

if (startVm(&mJavaVM, &env, zygote) != 0) {

return;

}

onVmCreated(env);

三、startVm函数

这个函数前边也是一堆处理Vm启动参数的逻辑

在函数的最好调用JNI_CreateJavaVM函数通过c++层的库创建虚拟机

四、JNI_CreateJavaVM函数

JNI_CreateJavaVM函数是在art/runtime/java_vm_ext.cc中实现的，代码如下：

// JNI Invocation interface.

extern "C" jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args) {
  ScopedTrace trace(__FUNCTION__);
  const JavaVMInitArgs* args = static_cast<JavaVMInitArgs*>(vm_args);
  if (JavaVMExt::IsBadJniVersion(args->version)) {
    LOG(ERROR) << "Bad JNI version passed to CreateJavaVM: " << args->version;
    return JNI_EVERSION;
  }
  RuntimeOptions options;
  for (int i = 0; i < args->nOptions; ++i) {
    JavaVMOption* option = &args->options[i];
    options.push_back(std::make_pair(std::string(option->optionString), option->extraInfo));
  }
  bool ignore_unrecognized = args->ignoreUnrecognized;
  if (!Runtime::Create(options, ignore_unrecognized)) {
    return JNI_ERR;
  }

  // Initialize native loader. This step makes sure we have
  // everything set up before we start using JNI.
  android::InitializeNativeLoader();

  Runtime* runtime = Runtime::Current();
  bool started = runtime->Start();
  if (!started) {
    delete Thread::Current()->GetJniEnv();
    delete runtime->GetJavaVM();
    LOG(WARNING) << "CreateJavaVM failed";
    return JNI_ERR;
  }

  *p_env = Thread::Current()->GetJniEnv();
  *p_vm = runtime->GetJavaVM();
  return JNI_OK;
}

// JNI Invocation interface.

extern "C" jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args) {

ScopedTrace trace(__FUNCTION__);

const JavaVMInitArgs* args = static_cast<JavaVMInitArgs*>(vm_args);

if (JavaVMExt::IsBadJniVersion(args->version)) {

LOG(ERROR) << "Bad JNI version passed to CreateJavaVM: " << args->version;

return JNI_EVERSION;

}

RuntimeOptions options;

for (int i = 0; i < args->nOptions; ++i) {

JavaVMOption* option = &args->options[i];

options.push_back(std::make_pair(std::string(option->optionString), option->extraInfo));

}

bool ignore_unrecognized = args->ignoreUnrecognized;

if (!Runtime::Create(options, ignore_unrecognized)) {

return JNI_ERR;

}

// Initialize native loader. This step makes sure we have

// everything set up before we start using JNI.

android::InitializeNativeLoader();

Runtime* runtime = Runtime::Current();

bool started = runtime->Start();

if (!started) {

delete Thread::Current()->GetJniEnv();

delete runtime->GetJavaVM();

LOG(WARNING) << "CreateJavaVM failed";

return JNI_ERR;

}

*p_env = Thread::Current()->GetJniEnv();

*p_vm = runtime->GetJavaVM();

return JNI_OK;

}

Runtime是在art/runtime/runtime.h中定义的类

Runtime::Current()返回一个静态的Runtime实例，代码如下：

static Runtime* instance_;

1	static Runtime* instance_;

runtime-Start()启动虚拟机

五、其他参考文章

Android ART运行时无缝替换Dalvik虚拟机的过程分析

https://blog.csdn.net/zhu929033262/article/details/77053640

Android虚拟机art流程：从zygote开始梳理art的启动（1）

https://www.shennongblog.com/art-zygote/

Laravel框架在执行ajax请求时附带token

分类：Javascript, Others, PHP 阅读 (605) 已关闭评论

7月 042020

代码如下：

<script>
function updateHomeSummary(){
    $.ajaxSetup({ 
        headers: { 'X-CSRF-TOKEN' : '{{ csrf_token() }}' } 
    });
    
    $.ajax({
        type: "POST",
        url: "homedatasummary",
        dataType: "json",
        success: function (data) {
             
        },
        error: function(XMLHttpRequest, textStatus, errorThrown) {
        
        }
    });
}
</script>

function updateHomeSummary(){

$.ajaxSetup({

headers: { 'X-CSRF-TOKEN' : '{{ csrf_token() }}' }

});

$.ajax({

type: "POST",

url: "homedatasummary",

dataType: "json",

success: function (data) {

error: function(XMLHttpRequest, textStatus, errorThrown) {

}

});

}

</script>

其中，ajax前面这段代码是用来附加token的

$.ajaxSetup({ headers: { ‘X-CSRF-TOKEN’ : ‘{{ csrf_token() }}’ } });

Flutter报Could not resolve io.flutter:flutter_embedding_debug问题解决

分类：Android, Java 阅读 (2,930) 已关闭评论

6月 132020

解决办法：

打开build.gradle文件，增加如下maven仓库地址：

文字版：

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
        maven { url "http://download.flutter.io" } //这里增加
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { url "http://download.flutter.io" } //这里增加
    }
}

buildscript {

ext.kotlin_version = '1.3.50'

repositories {

google()

jcenter()

maven { url "http://download.flutter.io" } //这里增加

}

dependencies {

classpath 'com.android.tools.build:gradle:3.5.0'

classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

}

allprojects {

repositories {

google()

jcenter()

maven { url "http://download.flutter.io" } //这里增加

}

Activity的onSaveInstanceState方法的官方解释

分类：Android, Java 阅读 (1,274) 已关闭评论

6月 032020

基于Android8.1系统源码中的注释翻译

翻译如下：

　　在一个Activity被杀死之前被调用以取出Activity中每个对象实例的状态，这些状态可以在onCreate或者onRestoreInstanceState方法中被重新加载到实例（此方法产生的Bundle将传递到那两个方法）。

　　这个方法在一个Activity可能被杀掉之前（不是刚刚被杀之前）被调用，以便于之后某些时候Activity被重新打开时可以恢复它的（某些变量的）状态。比如，如果ActivityB被打开并显示在ActivityA之前（ActivityA被置于后台），在某些时候ActivityA由于系统资源回收被杀掉，AvtivityA将有机会使用此方法来保存用户界面的当前状态，以便当用户回到ActivityA时，用户界面的状态可以在Activity的onCreate或者onRestoreInstanceState中被恢复。

　　不要把这个方法和Activity的生命周期比如onPause和onStop混淆。比如，当从ActivityB退出返回到ActivityA时，onPause和onStop将被调用，但是onSaveInstanceState不会被调用，此时没有必要对ActivityB调用此方法，因为ActivityB将被销毁，并且不会被恢复。另外一个例子，当ActivityB被打开并显示在ActivityA之前时，系统可能会避免调用ActivityA的onSaveInstanceState方法，因为在ActivityB的生命周期内，ActivityA的ui状态可能一直保持完整。

　　大部分UI组件的实例的（状态保存）默认实现是通过对布局中有id属性的view调用view自身的onSaveInstanceState()方法，通过id保存当前有焦点的view（通过view的onRestoreInstanceState来恢复状态）。如果你想使用这个方法来保存某个view的状态，最好使用view自身的onSaveInstanceState来处理，否则每个（Activity中）的view实例都需要你写代码来维护。

　　如果此方法被调用，将在onStop之前发生，但是不能保证肯定是在onPause之后发生。

原文如下：

    /**
     * Called to retrieve per-instance state from an activity before being killed
     * so that the state can be restored in {@link #onCreate} or
     * {@link #onRestoreInstanceState} (the {@link Bundle} populated by this method
     * will be passed to both).
     *
     * <p>This method is called before an activity may be killed so that when it
     * comes back some time in the future it can restore its state.  For example,
     * if activity B is launched in front of activity A, and at some point activity
     * A is killed to reclaim resources, activity A will have a chance to save the
     * current state of its user interface via this method so that when the user
     * returns to activity A, the state of the user interface can be restored
     * via {@link #onCreate} or {@link #onRestoreInstanceState}.
     *
     * <p>Do not confuse this method with activity lifecycle callbacks such as
     * {@link #onPause}, which is always called when an activity is being placed
     * in the background or on its way to destruction, or {@link #onStop} which
     * is called before destruction.  One example of when {@link #onPause} and
     * {@link #onStop} is called and not this method is when a user navigates back
     * from activity B to activity A: there is no need to call {@link #onSaveInstanceState}
     * on B because that particular instance will never be restored, so the
     * system avoids calling it.  An example when {@link #onPause} is called and
     * not {@link #onSaveInstanceState} is when activity B is launched in front of activity A:
     * the system may avoid calling {@link #onSaveInstanceState} on activity A if it isn't
     * killed during the lifetime of B since the state of the user interface of
     * A will stay intact.
     *
     * <p>The default implementation takes care of most of the UI per-instance
     * state for you by calling {@link android.view.View#onSaveInstanceState()} on each
     * view in the hierarchy that has an id, and by saving the id of the currently
     * focused view (all of which is restored by the default implementation of
     * {@link #onRestoreInstanceState}).  If you override this method to save additional
     * information not captured by each individual view, you will likely want to
     * call through to the default implementation, otherwise be prepared to save
     * all of the state of each view yourself.
     *
     * <p>If called, this method will occur before {@link #onStop}.  There are
     * no guarantees about whether it will occur before or after {@link #onPause}.
     *
     * @param outState Bundle in which to place your saved state.
     *
     * @see #onCreate
     * @see #onRestoreInstanceState
     * @see #onPause
     */

/**

* Called to retrieve per-instance state from an activity before being killed

* so that the state can be restored in {@link #onCreate} or

* {@link #onRestoreInstanceState} (the {@link Bundle} populated by this method

* will be passed to both).

* <p>This method is called before an activity may be killed so that when it

* comes back some time in the future it can restore its state. For example,

* if activity B is launched in front of activity A, and at some point activity

* A is killed to reclaim resources, activity A will have a chance to save the

* current state of its user interface via this method so that when the user

* returns to activity A, the state of the user interface can be restored

* via {@link #onCreate} or {@link #onRestoreInstanceState}.

* <p>Do not confuse this method with activity lifecycle callbacks such as

* {@link #onPause}, which is always called when an activity is being placed

* in the background or on its way to destruction, or {@link #onStop} which

* is called before destruction. One example of when {@link #onPause} and

* {@link #onStop} is called and not this method is when a user navigates back

* from activity B to activity A: there is no need to call {@link #onSaveInstanceState}

* on B because that particular instance will never be restored, so the

* system avoids calling it. An example when {@link #onPause} is called and

* not {@link #onSaveInstanceState} is when activity B is launched in front of activity A:

* the system may avoid calling {@link #onSaveInstanceState} on activity A if it isn't

* killed during the lifetime of B since the state of the user interface of

* A will stay intact.

* <p>The default implementation takes care of most of the UI per-instance

* state for you by calling {@link android.view.View#onSaveInstanceState()} on each

* view in the hierarchy that has an id, and by saving the id of the currently

* focused view (all of which is restored by the default implementation of

* {@link #onRestoreInstanceState}). If you override this method to save additional

* information not captured by each individual view, you will likely want to

* call through to the default implementation, otherwise be prepared to save

* all of the state of each view yourself.

* <p>If called, this method will occur before {@link #onStop}. There are

* no guarantees about whether it will occur before or after {@link #onPause}.

* @param outState Bundle in which to place your saved state.

* @see #onCreate

* @see #onRestoreInstanceState

* @see #onPause

顶栏phone.StatusBar中makeStatusBarView函数分析（未完）

分类：Android, Java 阅读 (1,701) 已关闭评论

6月 012020

本文基于Android8.1系统

    protected void makeStatusBarView() {
        final Context context = mContext;
        // 用于重新获取mDisplayMetrics和mCurrentDisplaySize
        updateDisplaySize(); // populates mDisplayMetrics
        // 重新加载QSPanel、NotificationPanel等的资源，因为可能configuration可能会有变化
        updateResources();
        updateTheme();

        // 用布局R.layout.super_status_bar填充mStatusBarWindow
        inflateStatusBarWindow(context);
        mStatusBarWindow.setService(this);
        mStatusBarWindow.setOnTouchListener(getStatusBarWindowTouchListener());

        // mNotificationPanel用于显示各种各种通知的根Panel
        // TODO: Deal with the ugliness that comes from having some of the statusbar broken out
        // into fragments, but the rest here, it leaves some awkward lifecycle and whatnot.
        mNotificationPanel = (NotificationPanelView) mStatusBarWindow.findViewById(
                R.id.notification_panel);
        // mStackScroller用于显示列表形式的系统通知
        mStackScroller = (NotificationStackScrollLayout) mStatusBarWindow.findViewById(
                R.id.notification_stack_scroller);
        mNotificationPanel.setStatusBar(this);
        mNotificationPanel.setGroupManager(mGroupManager);
        mAboveShelfObserver = new AboveShelfObserver(mStackScroller);
        mAboveShelfObserver.setListener(mStatusBarWindow.findViewById(
                R.id.notification_container_parent));
        mKeyguardStatusBar = (KeyguardStatusBarView) mStatusBarWindow.findViewById(R.id.keyguard_header);

        mNotificationIconAreaController = SystemUIFactory.getInstance()
                .createNotificationIconAreaController(context, this);
        inflateShelf();
        mNotificationIconAreaController.setupShelf(mNotificationShelf);
        Dependency.get(DarkIconDispatcher.class).addDarkReceiver(mNotificationIconAreaController);
        FragmentHostManager.get(mStatusBarWindow)
                .addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {
                    CollapsedStatusBarFragment statusBarFragment =
                            (CollapsedStatusBarFragment) fragment;
                    statusBarFragment.initNotificationIconArea(mNotificationIconAreaController);
                    mStatusBarView = (PhoneStatusBarView) fragment.getView();
                    mStatusBarView.setBar(this);
                    mStatusBarView.setPanel(mNotificationPanel);
                    mStatusBarView.setScrimController(mScrimController);
                    mStatusBarView.setBouncerShowing(mBouncerShowing);
                    setAreThereNotifications();
                    checkBarModes();
                }).getFragmentManager()
                .beginTransaction()
                .replace(R.id.status_bar_container, new CollapsedStatusBarFragment(),
                        CollapsedStatusBarFragment.TAG)
                .commit();
        mIconController = Dependency.get(StatusBarIconController.class);

        mHeadsUpManager = new HeadsUpManager(context, mStatusBarWindow, mGroupManager);
        mHeadsUpManager.setBar(this);
        mHeadsUpManager.addListener(this);
        mHeadsUpManager.addListener(mNotificationPanel);
        mHeadsUpManager.addListener(mGroupManager);
        mHeadsUpManager.addListener(mVisualStabilityManager);
        mNotificationPanel.setHeadsUpManager(mHeadsUpManager);
        mNotificationData.setHeadsUpManager(mHeadsUpManager);
        mGroupManager.setHeadsUpManager(mHeadsUpManager);
        mHeadsUpManager.setVisualStabilityManager(mVisualStabilityManager);

        if (MULTIUSER_DEBUG) {
            mNotificationPanelDebugText = (TextView) mNotificationPanel.findViewById(
                    R.id.header_debug_info);
            mNotificationPanelDebugText.setVisibility(View.VISIBLE);
        }

        try {
            boolean showNav = mWindowManagerService.hasNavigationBar();
            if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);
            if (showNav) {
                createNavigationBar();
            }
        } catch (RemoteException ex) {
            // no window manager? good luck with that
        }

        // figure out which pixel-format to use for the status bar.
        mPixelFormat = PixelFormat.OPAQUE;

        // 通知列表框
        mStackScroller.setLongPressListener(getNotificationLongClicker());
        mStackScroller.setStatusBar(this);
        mStackScroller.setGroupManager(mGroupManager);
        mStackScroller.setHeadsUpManager(mHeadsUpManager);
        mGroupManager.setOnGroupChangeListener(mStackScroller);
        mVisualStabilityManager.setVisibilityLocationProvider(mStackScroller);

        // 没有通知提示框
        inflateEmptyShadeView();
        // 清除所有通知提示框
        inflateDismissView();
        mExpandedContents = mStackScroller;

        // 包含多媒体插图、图片的View？不知道是干啥用的
        mBackdrop = (BackDropView) mStatusBarWindow.findViewById(R.id.backdrop);
        mBackdropFront = (ImageView) mBackdrop.findViewById(R.id.backdrop_front);
        mBackdropBack = (ImageView) mBackdrop.findViewById(R.id.backdrop_back);

        // 字面翻译：锁屏壁纸
        if (ENABLE_LOCKSCREEN_WALLPAPER) {
            mLockscreenWallpaper = new LockscreenWallpaper(mContext, this, mHandler);
        }

        mKeyguardIndicationController =
                SystemUIFactory.getInstance().createKeyguardIndicationController(mContext,
                (ViewGroup) mStatusBarWindow.findViewById(R.id.keyguard_indication_area),
                mNotificationPanel.getLockIcon());
        mNotificationPanel.setKeyguardIndicationController(mKeyguardIndicationController);


        mAmbientIndicationContainer = mStatusBarWindow.findViewById(
                R.id.ambient_indication_container);

        // set the initial view visibility
        setAreThereNotifications();

        // TODO: Find better place for this callback.
        mBatteryController.addCallback(new BatteryStateChangeCallback() {
            @Override
            public void onPowerSaveChanged(boolean isPowerSave) {
                mHandler.post(mCheckBarModes);
                if (mDozeServiceHost != null) {
                    mDozeServiceHost.firePowerSaveChanged(isPowerSave);
                }
            }

            @Override
            public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {
                // noop
            }
        });

        mLightBarController = Dependency.get(LightBarController.class);
        if (mNavigationBar != null) {
            mNavigationBar.setLightBarController(mLightBarController);
        }

        ScrimView scrimBehind = (ScrimView) mStatusBarWindow.findViewById(R.id.scrim_behind);
        ScrimView scrimInFront = (ScrimView) mStatusBarWindow.findViewById(R.id.scrim_in_front);
        View headsUpScrim = mStatusBarWindow.findViewById(R.id.heads_up_scrim);
        mScrimController = SystemUIFactory.getInstance().createScrimController(mLightBarController,
                scrimBehind, scrimInFront, headsUpScrim, mLockscreenWallpaper,
                scrimsVisible -> {
                    if (mStatusBarWindowManager != null) {
                        mStatusBarWindowManager.setScrimsVisible(scrimsVisible);
                    }
                });
        if (mScrimSrcModeEnabled) {
            Runnable runnable = new Runnable() {
                @Override
                public void run() {
                    boolean asSrc = mBackdrop.getVisibility() != View.VISIBLE;
                    mScrimController.setDrawBehindAsSrc(asSrc);
                    mStackScroller.setDrawBackgroundAsSrc(asSrc);
                }
            };
            mBackdrop.setOnVisibilityChangedRunnable(runnable);
            runnable.run();
        }
        mHeadsUpManager.addListener(mScrimController);
        mStackScroller.setScrimController(mScrimController);
        mDozeScrimController = new DozeScrimController(mScrimController, context);

        // Other icons
        mVolumeComponent = getComponent(VolumeComponent.class);

        mNotificationPanel.setUserSetupComplete(mUserSetup);
        if (UserManager.get(mContext).isUserSwitcherEnabled()) {
            createUserSwitcher();
        }

        // 配置快速设置小按钮的面板
        View container = mStatusBarWindow.findViewById(R.id.qs_frame);
        if (container != null) {
            FragmentHostManager fragmentHostManager = FragmentHostManager.get(container);
            ExtensionFragmentListener.attachExtensonToFragment(container, QS.TAG, R.id.qs_frame,
                    Dependency.get(ExtensionController.class).newExtension(QS.class)
                            .withPlugin(QS.class)
                            .withFeature(
                                    PackageManager.FEATURE_AUTOMOTIVE, () -> new CarQSFragment())
                            .withDefault(() -> new QSFragment())
                            .build());
            final QSTileHost qsh = SystemUIFactory.getInstance().createQSTileHost(mContext, this,
                    mIconController);
            mBrightnessMirrorController = new BrightnessMirrorController(mStatusBarWindow,
                    mScrimController);
            fragmentHostManager.addTagListener(QS.TAG, (tag, f) -> {
                QS qs = (QS) f;
                if (qs instanceof QSFragment) {
                    ((QSFragment) qs).setHost(qsh);
                    mQSPanel = ((QSFragment) qs).getQsPanel();
                    mQSPanel.setBrightnessMirror(mBrightnessMirrorController);
                    mKeyguardStatusBar.setQSPanel(mQSPanel);
                }
            });
        }

        mReportRejectedTouch = mStatusBarWindow.findViewById(R.id.report_rejected_touch);
        if (mReportRejectedTouch != null) {
            updateReportRejectedTouchVisibility();
            mReportRejectedTouch.setOnClickListener(v -> {
                Uri session = mFalsingManager.reportRejectedTouch();
                if (session == null) { return; }

                StringWriter message = new StringWriter();
                message.write("Build info: ");
                message.write(SystemProperties.get("ro.build.description"));
                message.write("\nSerial number: ");
                message.write(SystemProperties.get("ro.serialno"));
                message.write("\n");

                PrintWriter falsingPw = new PrintWriter(message);
                FalsingLog.dump(falsingPw);
                falsingPw.flush();

                startActivityDismissingKeyguard(Intent.createChooser(new Intent(Intent.ACTION_SEND)
                                .setType("*/*")
                                .putExtra(Intent.EXTRA_SUBJECT, "Rejected touch report")
                                .putExtra(Intent.EXTRA_STREAM, session)
                                .putExtra(Intent.EXTRA_TEXT, message.toString()),
                        "Share rejected touch report")
                                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
                        true /* onlyProvisioned */, true /* dismissShade */);
            });
        }

        PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
        if (!pm.isScreenOn()) {
            mBroadcastReceiver.onReceive(mContext, new Intent(Intent.ACTION_SCREEN_OFF));
        }
        mGestureWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,
                "GestureWakeLock");
        mVibrator = mContext.getSystemService(Vibrator.class);
        int[] pattern = mContext.getResources().getIntArray(
                R.array.config_cameraLaunchGestureVibePattern);
        mCameraLaunchGestureVibePattern = new long[pattern.length];
        for (int i = 0; i < pattern.length; i++) {
            mCameraLaunchGestureVibePattern[i] = pattern[i];
        }

        // receive broadcasts
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(DevicePolicyManager.ACTION_SHOW_DEVICE_MONITORING_DIALOG);
        context.registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter, null, null);

        IntentFilter demoFilter = new IntentFilter();
        if (DEBUG_MEDIA_FAKE_ARTWORK) {
            demoFilter.addAction(ACTION_FAKE_ARTWORK);
        }
        demoFilter.addAction(ACTION_DEMO);
        context.registerReceiverAsUser(mDemoReceiver, UserHandle.ALL, demoFilter,
                android.Manifest.permission.DUMP, null);

        // listen for USER_SETUP_COMPLETE setting (per-user)
        mDeviceProvisionedController.addCallback(mUserSetupObserver);
        mUserSetupObserver.onUserSetupChanged();

        // disable profiling bars, since they overlap and clutter the output on app windows
        ThreadedRenderer.overrideProperty("disableProfileBars", "true");

        // Private API call to make the shadows look better for Recents
        ThreadedRenderer.overrideProperty("ambientRatio", String.valueOf(1.5f));
    }

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protected void makeStatusBarView() {

final Context context = mContext;

// 用于重新获取mDisplayMetrics和mCurrentDisplaySize

updateDisplaySize(); // populates mDisplayMetrics

// 重新加载QSPanel、NotificationPanel等的资源，因为可能configuration可能会有变化

updateResources();

updateTheme();

// 用布局R.layout.super_status_bar填充mStatusBarWindow

inflateStatusBarWindow(context);

mStatusBarWindow.setService(this);

mStatusBarWindow.setOnTouchListener(getStatusBarWindowTouchListener());

// mNotificationPanel用于显示各种各种通知的根Panel

// TODO: Deal with the ugliness that comes from having some of the statusbar broken out

// into fragments, but the rest here, it leaves some awkward lifecycle and whatnot.

mNotificationPanel = (NotificationPanelView) mStatusBarWindow.findViewById(

R.id.notification_panel);

// mStackScroller用于显示列表形式的系统通知

mStackScroller = (NotificationStackScrollLayout) mStatusBarWindow.findViewById(

R.id.notification_stack_scroller);

mNotificationPanel.setStatusBar(this);

mNotificationPanel.setGroupManager(mGroupManager);

mAboveShelfObserver = new AboveShelfObserver(mStackScroller);

mAboveShelfObserver.setListener(mStatusBarWindow.findViewById(

R.id.notification_container_parent));

mKeyguardStatusBar = (KeyguardStatusBarView) mStatusBarWindow.findViewById(R.id.keyguard_header);

mNotificationIconAreaController = SystemUIFactory.getInstance()

.createNotificationIconAreaController(context, this);

inflateShelf();

mNotificationIconAreaController.setupShelf(mNotificationShelf);

Dependency.get(DarkIconDispatcher.class).addDarkReceiver(mNotificationIconAreaController);

FragmentHostManager.get(mStatusBarWindow)

.addTagListener(CollapsedStatusBarFragment.TAG, (tag, fragment) -> {

CollapsedStatusBarFragment statusBarFragment =

(CollapsedStatusBarFragment) fragment;

statusBarFragment.initNotificationIconArea(mNotificationIconAreaController);

mStatusBarView = (PhoneStatusBarView) fragment.getView();

mStatusBarView.setBar(this);

mStatusBarView.setPanel(mNotificationPanel);

mStatusBarView.setScrimController(mScrimController);

mStatusBarView.setBouncerShowing(mBouncerShowing);

setAreThereNotifications();

checkBarModes();

}).getFragmentManager()

.beginTransaction()

.replace(R.id.status_bar_container, new CollapsedStatusBarFragment(),

CollapsedStatusBarFragment.TAG)

.commit();

mIconController = Dependency.get(StatusBarIconController.class);

mHeadsUpManager = new HeadsUpManager(context, mStatusBarWindow, mGroupManager);

mHeadsUpManager.setBar(this);

mHeadsUpManager.addListener(this);

mHeadsUpManager.addListener(mNotificationPanel);

mHeadsUpManager.addListener(mGroupManager);

mHeadsUpManager.addListener(mVisualStabilityManager);

mNotificationPanel.setHeadsUpManager(mHeadsUpManager);

mNotificationData.setHeadsUpManager(mHeadsUpManager);

mGroupManager.setHeadsUpManager(mHeadsUpManager);

mHeadsUpManager.setVisualStabilityManager(mVisualStabilityManager);

if (MULTIUSER_DEBUG) {

mNotificationPanelDebugText = (TextView) mNotificationPanel.findViewById(

R.id.header_debug_info);

mNotificationPanelDebugText.setVisibility(View.VISIBLE);

}

try {

boolean showNav = mWindowManagerService.hasNavigationBar();

if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);

if (showNav) {

createNavigationBar();

}

} catch (RemoteException ex) {

// no window manager? good luck with that

}

// figure out which pixel-format to use for the status bar.

mPixelFormat = PixelFormat.OPAQUE;

// 通知列表框

mStackScroller.setLongPressListener(getNotificationLongClicker());

mStackScroller.setStatusBar(this);

mStackScroller.setGroupManager(mGroupManager);

mStackScroller.setHeadsUpManager(mHeadsUpManager);

mGroupManager.setOnGroupChangeListener(mStackScroller);

mVisualStabilityManager.setVisibilityLocationProvider(mStackScroller);

// 没有通知提示框

inflateEmptyShadeView();

// 清除所有通知提示框

inflateDismissView();

mExpandedContents = mStackScroller;

// 包含多媒体插图、图片的View？不知道是干啥用的

mBackdrop = (BackDropView) mStatusBarWindow.findViewById(R.id.backdrop);

mBackdropFront = (ImageView) mBackdrop.findViewById(R.id.backdrop_front);

mBackdropBack = (ImageView) mBackdrop.findViewById(R.id.backdrop_back);

// 字面翻译：锁屏壁纸

if (ENABLE_LOCKSCREEN_WALLPAPER) {

mLockscreenWallpaper = new LockscreenWallpaper(mContext, this, mHandler);

}

mKeyguardIndicationController =

SystemUIFactory.getInstance().createKeyguardIndicationController(mContext,

(ViewGroup) mStatusBarWindow.findViewById(R.id.keyguard_indication_area),

mNotificationPanel.getLockIcon());

mNotificationPanel.setKeyguardIndicationController(mKeyguardIndicationController);

mAmbientIndicationContainer = mStatusBarWindow.findViewById(

R.id.ambient_indication_container);

// set the initial view visibility

setAreThereNotifications();

// TODO: Find better place for this callback.

mBatteryController.addCallback(new BatteryStateChangeCallback() {

@Override

public void onPowerSaveChanged(boolean isPowerSave) {

mHandler.post(mCheckBarModes);

if (mDozeServiceHost != null) {

mDozeServiceHost.firePowerSaveChanged(isPowerSave);

}

@Override

public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {

// noop

}

});

mLightBarController = Dependency.get(LightBarController.class);

if (mNavigationBar != null) {

mNavigationBar.setLightBarController(mLightBarController);

}

ScrimView scrimBehind = (ScrimView) mStatusBarWindow.findViewById(R.id.scrim_behind);

ScrimView scrimInFront = (ScrimView) mStatusBarWindow.findViewById(R.id.scrim_in_front);

View headsUpScrim = mStatusBarWindow.findViewById(R.id.heads_up_scrim);

mScrimController = SystemUIFactory.getInstance().createScrimController(mLightBarController,

scrimBehind, scrimInFront, headsUpScrim, mLockscreenWallpaper,

scrimsVisible -> {

if (mStatusBarWindowManager != null) {

mStatusBarWindowManager.setScrimsVisible(scrimsVisible);

}

});

if (mScrimSrcModeEnabled) {

Runnable runnable = new Runnable() {

@Override

public void run() {

boolean asSrc = mBackdrop.getVisibility() != View.VISIBLE;

mScrimController.setDrawBehindAsSrc(asSrc);

mStackScroller.setDrawBackgroundAsSrc(asSrc);

}

};

mBackdrop.setOnVisibilityChangedRunnable(runnable);

runnable.run();

}

mHeadsUpManager.addListener(mScrimController);

mStackScroller.setScrimController(mScrimController);

mDozeScrimController = new DozeScrimController(mScrimController, context);

// Other icons

mVolumeComponent = getComponent(VolumeComponent.class);

mNotificationPanel.setUserSetupComplete(mUserSetup);

if (UserManager.get(mContext).isUserSwitcherEnabled()) {

createUserSwitcher();

}

// 配置快速设置小按钮的面板

View container = mStatusBarWindow.findViewById(R.id.qs_frame);

if (container != null) {

FragmentHostManager fragmentHostManager = FragmentHostManager.get(container);

ExtensionFragmentListener.attachExtensonToFragment(container, QS.TAG, R.id.qs_frame,

Dependency.get(ExtensionController.class).newExtension(QS.class)

.withPlugin(QS.class)

.withFeature(

PackageManager.FEATURE_AUTOMOTIVE, () -> new CarQSFragment())

.withDefault(() -> new QSFragment())

.build());

final QSTileHost qsh = SystemUIFactory.getInstance().createQSTileHost(mContext, this,

mIconController);

mBrightnessMirrorController = new BrightnessMirrorController(mStatusBarWindow,

mScrimController);

fragmentHostManager.addTagListener(QS.TAG, (tag, f) -> {

QS qs = (QS) f;

if (qs instanceof QSFragment) {

((QSFragment) qs).setHost(qsh);

mQSPanel = ((QSFragment) qs).getQsPanel();

mQSPanel.setBrightnessMirror(mBrightnessMirrorController);

mKeyguardStatusBar.setQSPanel(mQSPanel);

}

});

}

mReportRejectedTouch = mStatusBarWindow.findViewById(R.id.report_rejected_touch);

if (mReportRejectedTouch != null) {

updateReportRejectedTouchVisibility();

mReportRejectedTouch.setOnClickListener(v -> {

Uri session = mFalsingManager.reportRejectedTouch();

if (session == null) { return; }

StringWriter message = new StringWriter();

message.write("Build info: ");

message.write(SystemProperties.get("ro.build.description"));

message.write("\nSerial number: ");

message.write(SystemProperties.get("ro.serialno"));

message.write("\n");

PrintWriter falsingPw = new PrintWriter(message);

FalsingLog.dump(falsingPw);

falsingPw.flush();

startActivityDismissingKeyguard(Intent.createChooser(new Intent(Intent.ACTION_SEND)

.setType("*/*")

.putExtra(Intent.EXTRA_SUBJECT, "Rejected touch report")

.putExtra(Intent.EXTRA_STREAM, session)

.putExtra(Intent.EXTRA_TEXT, message.toString()),

"Share rejected touch report")

.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),

true /* onlyProvisioned */, true /* dismissShade */);

});

}

PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);

if (!pm.isScreenOn()) {

mBroadcastReceiver.onReceive(mContext, new Intent(Intent.ACTION_SCREEN_OFF));

}

mGestureWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,

"GestureWakeLock");

mVibrator = mContext.getSystemService(Vibrator.class);

int[] pattern = mContext.getResources().getIntArray(

R.array.config_cameraLaunchGestureVibePattern);

mCameraLaunchGestureVibePattern = new long[pattern.length];

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

mCameraLaunchGestureVibePattern[i] = pattern[i];

}

// receive broadcasts

IntentFilter filter = new IntentFilter();

filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

filter.addAction(Intent.ACTION_SCREEN_OFF);

filter.addAction(DevicePolicyManager.ACTION_SHOW_DEVICE_MONITORING_DIALOG);

context.registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter, null, null);

IntentFilter demoFilter = new IntentFilter();

if (DEBUG_MEDIA_FAKE_ARTWORK) {

demoFilter.addAction(ACTION_FAKE_ARTWORK);

}

demoFilter.addAction(ACTION_DEMO);

context.registerReceiverAsUser(mDemoReceiver, UserHandle.ALL, demoFilter,

android.Manifest.permission.DUMP, null);

// listen for USER_SETUP_COMPLETE setting (per-user)

mDeviceProvisionedController.addCallback(mUserSetupObserver);

mUserSetupObserver.onUserSetupChanged();

// disable profiling bars, since they overlap and clutter the output on app windows

ThreadedRenderer.overrideProperty("disableProfileBars", "true");

// Private API call to make the shadows look better for Recents

ThreadedRenderer.overrideProperty("ambientRatio", String.valueOf(1.5f));

}

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