OnTouch MotionEvent行动将不会触发 [英] OnTouch MotionEvent Action Move not triggering

问题描述

我试图让X，Y，而我拖着键的同时拖动，即使trothing我坐标不断更新，但由于某些原因，code波纹管连接在触摸监听器触发只有两次，而不是将得到满足，以提高性能，但正如我所说， onTouch 方法触发只是动作下来，一个更多的时间之后。

这是我的code：

 最后按钮dragBtn =（按钮）findViewById（R.id.MyTestButton）;

    dragBtn.setOnTouchListener（新View.OnTouchListener（）{

    @覆盖
    公共布尔onTouch（视图V，MotionEvent我）{
        // TODO自动生成方法存根
        ClipData数据= ClipData.newPlainText（，）;
        View.DragShadowBuilder阴影=新View.DragShadowBuilder（dragBtn）;
        v.startDrag（数据，阴影，NULL，0）;
        INT行动= me.getAction（）;


        如果（动作== MotionEvent.ACTION_DOWN）{

            Log.i（TEST，ACTION_DOWN）;
            返回true;
        }


        如果（动作== MotionEvent.ACTION_MOVE）{
            Log.i（TEST，ACTION_MOVE）;

            浮X = me.getX（）;
            浮动Y = me.getY（）;

            // TODO：我的code在这里休息。

            返回true;
        }

        如果（动作== MotionEvent.ACTION_UP）{

            Log.i（测试，ACTION_UP）;
            返回true;
        }

        Log.i（TEST，UKNOWN ACTION）;
        返回true;
    }
}）;
 

和日志我刚：

  ACTION_DOWN
窗口管理：将已在进行中
UKNOWN行动
 

解决方案

您想捕捉的X和Y坐标数据在你的 OnDragListener 不是你 OnTouchListener 。对于要拖动对象在屏幕上的全部时间，Android的跨$ P $其中pts，作为一个单一的ACTION_MOVE事件，因此你只能从获取一次数据。将下面的code自定义里面 OnDragListener 类：

  @覆盖
公共ondrag当布尔（视图V，的dragEvent事件）{
    INT行动= event.getAction（）;
    浮动XCOORD;
    浮动YCOORD;
    如果（动作== DragEvent.ACTION_DRAG_LOCATION）{
        XCOORD = event.getX（）;
        YCOORD = event.getY（）;
    }
    返回event.getResult（）; //返回真有效降还是假的无效降
}
 

在其他地方，在您的自定义 OnDragListener 类，你将不得不做一些与XCOORD和YCOORD数据。例如，在我的应用程序，我有一个的TextView 我的调试版本，我显示XCOORD和YCOORD数据的应用程序中。我执行 TextView.setText（）方法之后，我得到这两个值在我的如果（动作== DragEvent.ACTION_DRAG_LOCATION）{... 部分。

希望这有助于。

I'm trying to get X, Y coordinates while I'm dragging my button, but for some reason, the code bellow attached on touch listener triggers only twice instead of constant update while dragging, even with trothing I will be satisfied in order to improve performance, but as I said, onTouch method triggered just on action down, and one more time later.

This is my code:

final Button dragBtn = (Button) findViewById(R.id.MyTestButton);

    dragBtn.setOnTouchListener(new View.OnTouchListener() {

    @Override
    public boolean onTouch(View v, MotionEvent me) {
        // TODO Auto-generated method stub
        ClipData data = ClipData.newPlainText("", "");
        View.DragShadowBuilder shadow = new View.DragShadowBuilder(dragBtn);
        v.startDrag(data, shadow, null, 0);
        int action = me.getAction();


        if (action==MotionEvent.ACTION_DOWN) {

            Log.i("TEST", "ACTION_DOWN");
            return true;
        }


        if (action==MotionEvent.ACTION_MOVE){
            Log.i("TEST", "ACTION_MOVE");

            float x = me.getX();
            float y = me.getY();

            //TODO: Rest of my code here.

            return true;
        }

        if (action==MotionEvent.ACTION_UP){

            Log.i("TEST", "ACTION_UP");
            return true;
        }

        Log.i("TEST", "UKNOWN ACTION");
        return true;
    }
});

And in log I have just:

ACTION_DOWN
WindowManager﹕ Drag already in progress
UKNOWN ACTION

解决方案

You want to capture the X and Y coordinate data in your OnDragListener not your OnTouchListener. For the whole time that you are dragging the object around the screen, Android interprets that as one single ACTION_MOVE event, hence you only get data once from that. Place the following code inside your custom OnDragListener class:

@Override
public boolean onDrag(View v, DragEvent event) {
    int action = event.getAction();
    float xCoord;
    float yCoord;
    if(action == DragEvent.ACTION_DRAG_LOCATION) {
        xCoord = event.getX();
        yCoord = event.getY();
    }
    return event.getResult();       //returns true for valid drop or false for invalid drop
}

Somewhere else in your custom OnDragListener class, you will have to do something with that xCoord and yCoord data. For example in my app, I have a TextView on my "debug" version of the app where I display the xCoord and yCoord data. I execute the TextView.setText() method right after I get those two values in my if(action == DragEvent.ACTION_DRAG_LOCATION){... section.

Hope this helps.

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