事件分发时候的onTouchEvent，onInterceptTouchEvent，dispatchTouchEvent调用顺序

Posted 2020-08-12 妖久

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一直想弄清楚onTouchEvent，onInterceptTouchEvent，dispatchTouchEvent的执行顺序，以及内部使用switch (event.getAction())中的执行顺序。趁这次机会赶紧弄清楚。

public boolean onTouchEvent(MotionEvent event) {
        super.onTouchEvent(event);
        Log.e(TAG, "onTouchEvent");
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Log.e(TAG, "onTouchEvent_ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            Log.e(TAG, "onTouchEvent_ACTION_MOVE");
            break;
        case MotionEvent.ACTION_UP:
            Log.e(TAG, "onTouchEvent_ACTION_UP");
            break;
        default:
            break;
        }
        Log.e(TAG, "onTouchEvent_return");
        return isOnTouchEvent;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        Log.e(TAG, "onInterceptTouchEvent");
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Log.e(TAG, "onInterceptTouchEvent_ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            Log.e(TAG, "onInterceptTouchEvent_ACTION_MOVE");
            break;
        case MotionEvent.ACTION_UP:
            Log.e(TAG, "onInterceptTouchEvent_ACTION_UP");
            break;
        default:
            break;
        }
        Log.e(TAG, "onInterceptTouchEvent_return");
        return isOnInterceptTouchEvent;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        super.dispatchTouchEvent(event);
        Log.e(TAG, "dispatchTouchEvent");
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Log.e(TAG, "dispatchTouchEvent_ACTION_DOWN");
            break;
        case MotionEvent.ACTION_MOVE:
            Log.e(TAG, "dispatchTouchEvent_ACTION_MOVE");
            break;
        case MotionEvent.ACTION_UP:
            Log.e(TAG, "dispatchTouchEvent_ACTION_UP");
            break;
        default:
            break;
        }
        Log.e(TAG, "dispatchTouchEvent_return");
        return isDispatchTouchEvent;
    }