为什么没有这个MotionEvent模拟工作？ [英] Why doesn't this MotionEvent simulation work?

问题描述

在在练习的应用程序的视图中的一个，我试图以编程方式执行文本的选择。

我能够（编程）输入文本选择模式，这是视觉上由CursorControllers（AKA处理）在视图的左上角显示。

如果我的手动拖动右侧CursorController，然后再次单击它（在模拟器），它工作正常（完全），呈现出一条简短的消息：文本复制到剪贴板

但是，当我试图以编程方式拖动右侧CursorController，什么都不会发生。

我尝试这样做的方式是通过模拟MotionEvent。在视图中，我呼吁：

 事件= MotionEvent.obtain（停机，eventTime，MotionEvent.ACTION_DOWN，X，Y，0）;
  MainActivity.onTouch（这一点，活动）;
 

在课程的MainActivity我实现OnTouchListener：

  @覆盖
公共布尔onTouch（视图V，MotionEvent事件）{//叫按钮前的的onTouchEvent（）
    Log.v（MainActivity :: onTouch（），describeEvent（ⅴ，事件））;
    开关（event.getAction（））{
        案例MotionEvent.ACTION_DOWN：
        案例MotionEvent.ACTION_UP：
            如果（！v.hasFocus（））{
                v.requestFocus（）;
             }
             打破;
    }
    返回false;
}
 

如果我理解正确的话，仅仅通过返回假从onTouch，机器人不断寻找另一个UI对象消耗MotionEvent对象，最终到达我的看法

为什么不这样呢？

我一定是失去了一些东西很基本的...

解决方案

由于缺乏一个有效的解决方案，我只能说我一直在试图完成不可能对Android，出于安全考虑。一种解释可以在以下链接：<一href="http://stackoverflow.com/questions/5240287/how-to-send-synthesized-motionevent-through-the-system/5240821#5240821">How要通过系统发送合成MotionEvent？

In one of the views in an exercise app, am trying to perform text selection programmatically.

I am able to (programmatically) enter "text selection mode", which is visually indicated by CursorControllers (AKA handles) on the top-left corner of the view.

If I manually drag the right CursorController, then click it again (in the emulator), it works as expected (perfectly), showing a brief message: "Text copied to clipboard".

But when I try to programmatically drag that right CursorController, nothing happens.

The way I try to do this is by simulating a MotionEvent. In the view, I call:

  event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, x, y, 0);
  MainActivity.onTouch(this, event);

In the MainActivity I of course implement OnTouchListener:

@Override
public boolean onTouch(View v, MotionEvent event) { // called BEFORE button's onTouchEvent()
    Log.v("MainActivity::onTouch()", describeEvent(v, event));
    switch (event.getAction()) { 
        case MotionEvent.ACTION_DOWN: 
        case MotionEvent.ACTION_UP: 
            if (!v.hasFocus()) { 
                v.requestFocus(); 
             } 
             break; 
    } 
    return false; 
}

If I understand correctly, by mere returning 'false' from onTouch, Android keeps looking for another UI object to consume the MotionEvent object, eventually reaching my view.

Why doesn't this happen?

I must be missing something very fundamental...

解决方案

For lack of a working solution, I can only conclude that what I have been trying to accomplish isn't possible on the Android, for reasons of security. An explanation can be found in the following link: How to send synthesized MotionEvent through the system?

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