InputDispatcher向InputChannel使用socket寫入輸入事件，觸發InputEventReceiver調用來接收輸入事件。

ViewPostImeInputStage處理view控件的事件

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@frameworks/base/core/java/android/view/InputEventReceiver.java    dispatchInputEvent
@frameworks/base/core/java/android/view/ViewRootImpl.javaonInputEvent(event);enqueueInputEvent(event, this, 0, true);if (processImmediately) { doProcessInputEvents(); }deliverInputEvent(q);  //在deliverInputEvent函數中做輸入事件的實際分發stage = q.shouldSkipIme() ? mFirstPostImeInputStage : mFirstInputStage;  //這里開始選擇 責任鏈的入口，具體請看InputStage的處理流程stage.deliver(q);  //這里主要調用InputStage的deliver方法進行分發，InputStage代表了輸入事件的處理階段，使用責任鏈模式設計模式。result = onProcess(q);  // EarlyPostImeInputStage::onProcessapply(q, result);if (result == FORWARD) {   forward(q);  } onDeliverToNext(q);mNext.deliver(q);result = onProcess(q);  //NativePostImeInputStage::onProcessmNext.deliver(q);result = onProcess(q); //ViewPostImeInputStage::onProcessif((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { return processPointerEvent(q); }
@frameworks/base/core/java/android/view/View.javaboolean handled = mView.dispatchPointerEvent(event);//MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=0, x[0]=692.0, y[0]=993.0, toolType[0]=TOOL_TYPE_FINGER, displayId=0, buttonState=0, classification=NONE, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=455777, downTime=455777, deviceId=-1, source=0x5002, eventId=-701920562 }}dispatchTouchEvent(event); if (mInputEventConsistencyVerifier != null) {  mInputEventConsistencyVerifier.onTouchEvent(event, 0);    }                                                                 
@XrView.java//調用app setOnTouchListener(mTouchListener)注冊的Listenerif (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && li.mOnTouchListener.onTouch(this, event)) {result = true;} return true;    //返回true表示已經處理完成，不往下走，fasle則相反if (!result && onTouchEvent(event)) { result = true;}   //調用app的onTouchEvent或者View.java的onTouchEvent//MotionEvent { action=ACTION_HOVER_MOVE, actionButton=0, id[0]=0, x[0]=664.80475, y[0]=407.85626, toolType[0]=TOOL_TYPE_MOUSE, displayId=0, buttonState=0, classification=NONE, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=284960, downTime=284790, deviceId=3, source=0x2002, eventId=1040558423 }dispatchGenericMotionEvent(event);if (action == MotionEvent.ACTION_HOVER_ENTER || action == MotionEvent.ACTION_HOVER_MOVE || action == MotionEvent.ACTION_HOVER_EXIT) { if (dispatchHoverEvent(event)) }li.mOnHoverListener.onHover(this, event))
@MyApplication/app/src/main/java/com/example/myapplication/MainActivity.javapublic boolean onHover(View view, MotionEvent motionEvent) { return false; }  //回調Button控件的onHoverdispatchGenericMotionEventInternal(event)onGenericMotionEvent(event)maybeUpdatePointerIcon(event);if (event.getActionMasked() != MotionEvent.ACTION_HOVER_EXIT) { if (!updatePointerIcon(event) && }InputManager.getInstance().setPointerIconType(pointerType);  // pointerType = 1002, 鼠標樣式由箭頭變成小手