View系列-事件分发

1.Activity.dispatchTouchEvent

//frameworks\base\core\java\android\app\Activity.javapublic class Activity extends ContextThemeWrapperimplements LayoutInflater.Factory2,Window.Callback, KeyEvent.Callback,OnCreateContextMenuListener, ComponentCallbacks2,Window.OnWindowDismissedCallback {public boolean dispatchTouchEvent(MotionEvent ev) {if (ev.getAction() == MotionEvent.ACTION_DOWN) {onUserInteraction();}if (getWindow().superDispatchTouchEvent(ev)) { //通过PhoneWindow进行分发事件return true;}return onTouchEvent(ev);}}

2.Activity.getWindow()

//frameworks\base\core\java\android\app\Activity.javapublic class Activity extends ContextThemeWrapperimplements LayoutInflater.Factory2,Window.Callback, KeyEvent.Callback,OnCreateContextMenuListener, ComponentCallbacks2,Window.OnWindowDismissedCallback {private Window mWindow; //Activity的一个对象，在attach方法里初始化final void attach(Context context, ActivityThread aThread,Instrumentation instr, IBinder token, int ident,Application application, Intent intent, ActivityInfo info,CharSequence title, Activity parent, String id,NonConfigurationInstances lastNonConfigurationInstances,Configuration config, String referrer, IVoiceInteractor voiceInteractor) {mWindow = new PhoneWindow(this);}public Window getWindow() {return mWindow;}}

3.PhoneWindow.superDispatchTouchEvent

继续调用DecorView的superDispatchTouchEvent

//frameworks\base\core\java\com\android\internal\policy\PhoneWindow.javapublic class PhoneWindow extends Window implements MenuBuilder.Callback {// This is the top-level view of the window, containing the window decor.private DecorView mDecor;@Overridepublic boolean superDispatchTouchEvent(MotionEvent event) {return mDecor.superDispatchTouchEvent(event);}}

4.DecorView.superDispatchTouchEvent

//frameworks\base\core\java\com\android\internal\policy\PhoneWindow.javapublic class PhoneWindow extends Window implements MenuBuilder.Callback {private final class DecorView extends FrameLayout implements RootViewSurfaceTaker {public boolean superDispatchTouchEvent(MotionEvent event) {return super.dispatchTouchEvent(event);}}}

5.ViewGroup.dispatchTouchEvent

//frameworks\base\core\java\android\view\ViewGroup.javapublic abstract class ViewGroup extends View implements ViewParent, ViewManager {public boolean dispatchTouchEvent(MotionEvent ev) {//省略代码}}

6.Activity、PhoneWindow、DecorView

6.1.Activity和PhoneWindow

PhoneWindow是Activity的一个对象

//frameworks\base\core\java\android\app\Activity.javapublic class Activity extends ContextThemeWrapperimplements LayoutInflater.Factory2,Window.Callback, KeyEvent.Callback,OnCreateContextMenuListener, ComponentCallbacks2,Window.OnWindowDismissedCallback {private Window mWindow; //Activity的一个对象，在attach方法里初始化final void attach(Context context, ActivityThread aThread,Instrumentation instr, IBinder token, int ident,Application application, Intent intent, ActivityInfo info,CharSequence title, Activity parent, String id,NonConfigurationInstances lastNonConfigurationInstances,Configuration config, String referrer, IVoiceInteractor voiceInteractor) {mWindow = new PhoneWindow(this);}public Window getWindow() {return mWindow;}}

6.2.PhoneWindow和DecorView

DecorView是PhoneWindow的一个对象

DecorView继承自FrameLayout

public class PhoneWindow extends Window implements MenuBuilder.Callback {// This is the top-level view of the window, containing the window decor.private DecorView mDecor; //继承自FrameLayout@Overridepublic final View getDecorView() {if (mDecor == null) {installDecor();}return mDecor;}private void installDecor() {if (mDecor == null) {mDecor = generateDecor();//省略代码}//省略代码}protected DecorView generateDecor() {return new DecorView(getContext(), -1);}private final class DecorView extends FrameLayout implements RootViewSurfaceTaker {}}