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public final class Launcher extends Activity{ //onCick事件 public void onClick(View v) { Object tag = v.getTag(); if (tag instanceof ApplicationInfo) { // 打开快捷键 final Intent intent = ((ApplicationInfo) tag).intent; int[] pos = new int[2]; v.getLocationOnScreen(pos); intent.setSourceBounds(new Rect(pos[0], pos[1], pos[0] + v.getWidth(), pos[1] + v.getHeight())); //重点就是这个方法 this.startActivitySafely(intent); } else if (tag instanceof FolderInfo) { this.handleFolderClick((FolderInfo) tag); } } //这个方法做了2件事 void startActivitySafely(Intent intent) { //区别于默认优先启动在activity栈中已经存在的activity //如果之前启动过，并还没有被destroy的话 //而是无论是否存在，都重新启动新的activity intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); this.startActivity(intent); }} |
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public void startActivity(Intent intent, Bundle options) { //-1标示不需要这个Activity结束后返回结果 startActivityForResult(intent, -1);}public void startActivityForResult(Intent intent, int requestCode, Bundle options) { //Instrumentation监视应用程序和系统的交互 Instrumentation.ActivityResult ar = mInstrumentation.execStartActivity(.....} |
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public class Instrumentation { //内部类,从类名我们知道是Activity的监视类 public static class ActivityMonitor { } //还有一些call方法,如下截图} |
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public Activity newActivity(...){ //通过反射构造出Activity对象 Activity activity = (Activity)clazz.newInstance(); //按照我们的习惯,应该下一步是调用Activity.onCreate(),但是趋势attach() activity.attach(context, aThread,....);//初始化Activity，生成一个window对象，设置各种状态等等 return activity;} |
1,AndroidStack发消息给Lanucher的ActivityThread告诉Lanucher进入onPause阶段详细步骤:AndroidStack发送消息给ActivityThread<Launcher应用的主线程>线程去OnPauser掉Lancher2,AndroidStack发消息给目标应用的ActivityThread, 目标应用该启动起来了
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public static final void main(String[] args) { SamplingProfilerIntegration.start(); …… Looper.prepareMainLooper(); if (sMainThreadHandler == null) { sMainThreadHandler = new Handler(); } ActivityThread thread = new ActivityThread(); thread.attach(false); …… Looper.loop();//主线程while(true)? 分发消息 …… thread.detach(); …… Slog.i(TAG, "Main thread of " + name + " is now exiting");} |
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public static final void loop() { Looper me = myLooper(); MessageQueue queue = me.mQueue; while (true) { ..... }} |
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原文地址：http://blog.csdn.net/kkopopo/article/details/42126679
