魅族手机onTouchEvent 、onLongClick踩坑

在遇到的坑之前我们先了解 Android onTouchEvent, onClick及onLongClick的调用机制

onTouchEvent:

onTouchEvent中要处理的最常用的3个事件就是：ACTION_DOWN（按下）、ACTION_MOVE（移动）、ACTION_UP（抬起）。

onClick、onLongClick与onTouchEvent

在Android中，onClick、onLongClick的触发是和ACTION_DOWN及ACTION_UP相关的，在时序上，如果我们在一个View中同时覆写了onClick、onLongClick及onTouchEvent的话，onTouchEvent是最先捕捉到ACTION_DOWN和ACTION_UP事件的，其次才可能触发onClick或者onLongClick。主要的逻辑在View.java中的onTouchEvent方法中实现的,主要的操作是在View.onTucchEvent下的：

    switch (event.getAction()) {
         case MotionEvent.ACTION_UP:
             boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0;
             if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) {
                 // take focus if we don't have it already and we should in
                 // touch mode.
                 boolean focusTaken = false;
                 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) {
                     focusTaken = requestFocus();
                 }

                 if (prepressed) {
                     // The button is being released before we actually
                     // showed it as pressed.  Make it show the pressed
                     // state now (before scheduling the click) to ensure
                     // the user sees it.
                     setPressed(true, x, y);
                }

                 if (!mHasPerformedLongPress) {
                     // This is a tap, so remove the longpress check
                     removeLongPressCallback();

                     // Only perform take click actions if we were in the pressed state
                     if (!focusTaken) {
                         // Use a Runnable and post this rather than calling
                         // performClick directly. This lets other visual state
                         // of the view update before click actions start.
                         if (mPerformClick == null) {
                             mPerformClick = new PerformClick();
                         }
                         if (!post(mPerformClick)) {
                             performClick();
                         }
                     }
                 }

                 if (mUnsetPressedState == null) {
                     mUnsetPressedState = new UnsetPressedState();
                 }

                 if (prepressed) {
                     postDelayed(mUnsetPressedState,
                             ViewConfiguration.getPressedStateDuration());
                 } else if (!post(mUnsetPressedState)) {
                     // If the post failed, unpress right now
                     mUnsetPressedState.run();
                 }

                 removeTapCallback();
             }
             break;

         case MotionEvent.ACTION_DOWN:
             mHasPerformedLongPress = false;

             if (performButtonActionOnTouchDown(event)) {
                 break;
             }

             // Walk up the hierarchy to determine if we're inside a scrolling container.
             boolean isInScrollingContainer = isInScrollingContainer();

             // For views inside a scrolling container, delay the pressed feedback for
             // a short period in case this is a scroll.
             if (isInScrollingContainer) {
                 mPrivateFlags |= PFLAG_PREPRESSED;
                 if (mPendingCheckForTap == null) {
                     mPendingCheckForTap = new CheckForTap();
                 }
                 mPendingCheckForTap.x = event.getX();
                 mPendingCheckForTap.y = event.getY();
                 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
             } else {
                 // Not inside a scrolling container, so show the feedback right away
                 setPressed(true, x, y);
                 checkForLongClick(0);
             }
             break;

         case MotionEvent.ACTION_CANCEL:
             setPressed(false);
             removeTapCallback();
             removeLongPressCallback();
             break;

         case MotionEvent.ACTION_MOVE:
             drawableHotspotChanged(x, y);

             // Be lenient about moving outside of buttons
             if (!pointInView(x, y, mTouchSlop)) {
                 // Outside button
                 removeTapCallback();
                 if ((mPrivateFlags & PFLAG_PRESSED) != 0) {
                     // Remove any future long press/tap checks
                     removeLongPressCallback();

                     setPressed(false);
                 }
             }
             break;

可以看到，Click的触发是在系统捕捉到ACTION_UP后发生并由performClick()执行的;LongClick的触发则是从ACTION_DOWN开始，由checkForLongClick()方法完成的；他们执行Touch事件的的顺序 ACTION_DOWN ->ACTION_UP->OnClick/OnLongClick。?

首先，该View会先响应ACTION_DOWN事件，并返回一个boolean值，这里有两种判断： 1.?返回true，表示该View接受此按下动作，就是说这个点击动作的按下操作被中止，然后就是响应ACTION_UP事件。点击动作的按下操作被ACTION_DOWN接受之后就结束了，所以之后的OnClick/OnLongClick事件就不会响应了。

返回false，表示该View不接受此按下动作，响应完之后，按下操作继续往下发，之后是响应ACTION_UP事件，这里又有一个判断：

如果ACTION_UP事件返回true，表示ACTION_UP接受松开操作，松开操作中止；View会一直处于按下状态，之后View便会响应OnLongClick事件。

如果ACTION_UP事件返回false，表示ACTION_UP不接收松开操作，松开操作继续下发；因为按下与松开操作都没有被中止，所以之后View就会响应OnClick事件。

下面就是我在魅族中踩的坑了：

手机在EditText长按进行粘贴，会触发OnLongClick 的事件，但是我在魅族的手机EditText长按进行粘贴，如果做了onTouchEvent监听，死活的都不会触发OnLongClick 的事件，不够onTouchEvent返回的是true还是false 都白费，当然也不会进行粘贴；其他的手机都是按照正常的节奏来，就只有魅族！找到问题了现在就是怎么去解决问题，这里我用到onTouchEvent 主要监听的是ACTION_MOVE 的处理，既然onTuchEvent不行就只有用其方式来监听滑动了，用到的是GestureDetector.SimpleOnGestureListener 进行监听的：

public static class SimpleOnGestureListener implements OnGestureListener, OnDoubleTapListener {  
 // --------------OnGestureListener的接口有这几个----------------
 //?抬起，手指离开触摸屏时触发(长按、滚动、滑动时，不会触发这个手势)??
    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }

   //?长按，触摸屏按下后既不抬起也不移动，过一段时间后触发?
    public void onLongPress(MotionEvent e) {
    }

  //?滚动，触摸屏按下后移动??
    public boolean onScroll(MotionEvent e1, MotionEvent e2,
            float distanceX, float distanceY) {
        return false;
    }

  //?滑动，触摸屏按下后快速移动并抬起，会先触发滚动手势，跟着触发一个滑动手势??
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        return false;
    }

  //?短按，触摸屏按下后片刻后抬起，会触发这个手势，如果迅速抬起则不会?
    public void onShowPress(MotionEvent e) {
    }
    //?单击，触摸屏按下时立刻触发
    public boolean onDown(MotionEvent e) {
        return false;
    }
    //------------------------OnDoubleTapListener的接口有这几个-----------
  //?双击，手指在触摸屏上迅速点击第二下时触发??
    public boolean onDoubleTap(MotionEvent e) {
        return false;
    }
   //?双击的按下跟抬起各触发一次??
    public boolean onDoubleTapEvent(MotionEvent e) {
        return false;
    }
   //?单击确认，即很快的按下并抬起，但并不连续点击第二下??
    public boolean onSingleTapConfirmed(MotionEvent e) {
        return false;
    }
}

于是我重写我的EditText 继承EditText：

public class MyEditText extends EditText {
private GestureDetector mGestureDetector;
private SimpleOnGestureListener simpleOnGestureListener;
private Context context;
public MyEditText(Context context) {
	super(context);
	this.context = context;
	setLongClickable(true);
}
public void setMyGestureListener(SimpleOnGestureListener simpleOnGestureListener) {
	this.simpleOnGestureListener = simpleOnGestureListener;
	setGestureDetector();
}

public MyEditText(Context context, AttributeSet attrs) {
	super(context, attrs);
	setLongClickable(true);
	this.context = context;

}

private void setGestureDetector() {
	mGestureDetector = new GestureDetector(context, simpleOnGestureListener);
	this.setOnTouchListener(new OnTouchListener() {

		public boolean onTouch(View v, MotionEvent event) {
			return mGestureDetector.onTouchEvent(event);
		}
	});
}

注意：

 1.这里一定要记得设置longClickable为true， 否则手势识别无法正确工作，只会返回Down, Show, Long三种手势
 2. 必须在View的onTouchListener中调用手势识别，而不能像Activity一样重载onTouchEvent，否则同样手势识别无法正确工作 ---------------------------------------------------------------------------------- 最后这样就ok了：

        mTvEditContent.setMyGestureListener(new SimpleOnGestureListener() {
		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
			// 处理我想做的
			return super.onScroll(e1, e2, distanceX, distanceY);
		}
	});

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