一个Activity一个线程
只能在主线程更新ui？不存在的，任何一个Activity都可以在子线程中（然并卵，好像没啥卵用）
具体实现
- 替换
ActivityThread.mH.callback从而监听Activity生命周期等一系列对Activity的调用 - 取出
handleMessage(final Message msg)的msg中的binder，每一个binder对应一个Activity，为该binder对象创建一个HandlerThread - 在这个handlerThread中调用mH的相关方法
主要代码
/**
* 测试通过
* api 18
* api 19
* api 21
* api 24
* api 26
* api 28
*/
public class MultiThreadActivity {
private Map<IBinder, HandlerThread> handlerThreadMap = new HashMap<>();
private IActivityLifecycleCompact lifecycleCompact;
public MultiThreadActivity(Context context) {
if (Build.VERSION.SDK_INT >= 28) {
lifecycleCompact = new ActivityLifecycleV28Compact(context);
} else if (Build.VERSION.SDK_INT >= 26) {
lifecycleCompact = new ActivityLifecycleV26Compact();
} else if (Build.VERSION.SDK_INT >= 24) {
lifecycleCompact = new ActivityLifecycleV24Compact();
} else if (Build.VERSION.SDK_INT >= 21) {
lifecycleCompact = new ActivityLifecycleV21Compact();
} else if (Build.VERSION.SDK_INT >= 15) {
lifecycleCompact = new ActivityLifecycleV15Compact();
} else {
lifecycleCompact = new ActivityLifecycleV0Compact();
}
try {
init();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void init() throws ClassNotFoundException, NoSuchMethodException, NoSuchFieldException, InvocationTargetException, IllegalAccessException {
Class activityThreadClass = Class.forName("android.app.ActivityThread");
Object activityThread = activityThreadClass.getDeclaredMethod("currentActivityThread").invoke(null);
final Field mhField = activityThreadClass.getDeclaredField("mH");
mhField.setAccessible(true);
final Handler mhHandler = (Handler) mhField.get(activityThread);
Field callbackField = Handler.class.getDeclaredField("mCallback");
callbackField.setAccessible(true);
final Handler.Callback originCallback = (Handler.Callback) callbackField.get(mhHandler);
callbackField.set(mhHandler, new Handler.Callback() {
@Override
public boolean handleMessage(final Message msg) {
final Message message = new Message();
message.copyFrom(msg);
if (Build.VERSION.SDK_INT >= 28) {//android P 生命周期全部走这
return deliverAboveApi28(msg, message, mhHandler);
} else {
return deliverBeforeApi28(msg, message, mhHandler);
}
}
});
}
private boolean deliverBeforeApi28(Message msg, Message message, Handler mhHandler) {
final int LAUNCH_ACTIVITY = 100;
final int PAUSE_ACTIVITY = 101;
final int PAUSE_ACTIVITY_FINISHING = 102;
final int STOP_ACTIVITY_HIDE = 104;
final int RESUME_ACTIVITY = 107;
final int DESTROY_ACTIVITY = 109;
final int NEW_INTENT = 112;
final int RELAUNCH_ACTIVITY = 126;
final int CONFIGURATION_CHANGED = 118;
switch (msg.what) {
case LAUNCH_ACTIVITY:// startActivity--> activity.attach activity.onCreate r.activity!=null activity.onStart activity.onResume
IBinder iBinder = lifecycleCompact.onLaunchActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case RESUME_ACTIVITY://回到activity onRestart onStart onResume
iBinder = lifecycleCompact.onResumeActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case PAUSE_ACTIVITY_FINISHING://按返回键 onPause
iBinder = lifecycleCompact.onPauseActivityFinish(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case PAUSE_ACTIVITY://开启新页面时，旧页面执行 activity.onPause
iBinder = lifecycleCompact.onPauseActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case STOP_ACTIVITY_HIDE://开启新页面时，旧页面执行 activity.onStop
iBinder = lifecycleCompact.onStopActivityHide(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case DESTROY_ACTIVITY:// 关闭activity onStop onDestroy
iBinder = lifecycleCompact.onDestroyActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
case NEW_INTENT:// TODO: 2018/12/29
return false;
case CONFIGURATION_CHANGED:// TODO: 2018/12/29
return false;
case RELAUNCH_ACTIVITY:
iBinder = lifecycleCompact.onReLaunchActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
}
// if (originCallback != null) {
// return originCallback.handleMessage(msg);
// }
return false;
}
private boolean deliverAboveApi28(Message msg, Message message, Handler mhHandler) {
final int EXECUTE_TRANSACTION = 159;
final int ENTER_ANIMATION_COMPLETE = 149;
final int CONFIGURATION_CHANGED = 118;
final int DUMP_ACTIVITY = 136;
final int RELAUNCH_ACTIVITY = 160;
if (msg.what == EXECUTE_TRANSACTION) {
IBinder iBinder = lifecycleCompact.onLaunchActivity(msg);
deliverOnChildThread(message, iBinder, mhHandler);
return true;
} else if (msg.what == ENTER_ANIMATION_COMPLETE) {
deliverOnChildThread(message, (IBinder) message.obj, mhHandler);
return true;
}
// else if (){ // TODO: 2018/12/29
// final int CONFIGURATION_CHANGED = 118;
// final int DUMP_ACTIVITY = 136;
// final int RELAUNCH_ACTIVITY = 160;
// }
// if (originCallback != null) {
// return originCallback.handleMessage(msg);
// }
return false;
}
private void deliverOnChildThread(final Message message, IBinder iBinder, final Handler mhHandler) {
HandlerThread handlerThread = handlerThreadMap.get(iBinder);
if (handlerThread == null) {
handlerThread = new HandlerThread("");
handlerThread.start();
handlerThreadMap.put(iBinder, handlerThread);
}
new Handler(handlerThread.getLooper()).post(new Runnable() {
@Override
public void run() {
mhHandler.handleMessage(message);
}
});
}