如何使 MotionEvent 进行缩放？

Question

我有一个工具，我想用它来测试我的应用程序，但我似乎无法正确模拟捏合缩放。这是我当前的代码。其要点是：同时按下手指 1 和手指 2，将它们移近彼此，然后松开它们。

private void performZoomTest(int numUpdates) {
    long downTime = SystemClock.uptimeMillis();
    long eventTime = SystemClock.uptimeMillis();    

    float x1 = 0;
    float y1 = 0;

    Display main = activity.getWindowManager().getDefaultDisplay();

    float x2 = main.getWidth();
    float y2 = main.getHeight();

    float xstep = x2 / (2 * numUpdates);
    float ystep = y2 / (2 * numUpdates);

    int id1 = 0 << MotionEvent.ACTION_POINTER_ID_SHIFT;
    int id2 = 1 << MotionEvent.ACTION_POINTER_ID_SHIFT;

    MotionEvent event = 
        MotionEvent.obtain(downTime, eventTime, 
                   MotionEvent.ACTION_DOWN + id1,
                   x1, y1, 0);
    sendPointerSync(event);
    event = 
        MotionEvent.obtain(downTime, eventTime, 
                   MotionEvent.ACTION_DOWN + id2,
                   x2, y2, 0);
    sendPointerSync(event);

    waitForIdleSync();

    for (int i = 0; i < numUpdates; i++) {
        eventTime = SystemClock.uptimeMillis();

        Log.i("",Integer.toString(i));
        x1 += xstep;
        y1 += ystep;

        x2 -= xstep;
        y2 -= ystep;

        event = 
            MotionEvent.obtain(downTime, eventTime, 
                       MotionEvent.ACTION_MOVE + id1,
                       x1, y1, 0);
        Log.i("id1", Integer.toString(MotionEvent.ACTION_MOVE + id1));
        sendPointerSync(event);
        event = 
            MotionEvent.obtain(downTime, eventTime, 
                       MotionEvent.ACTION_MOVE + id2, 
                       x2, y2, 0);
        Log.i("id1", Integer.toString(MotionEvent.ACTION_MOVE + id2));
        sendPointerSync(event);

        waitForIdleSync();
    } 

    eventTime = SystemClock.uptimeMillis();

    event = 
        MotionEvent.obtain(downTime, eventTime, 
                   MotionEvent.ACTION_UP + id1, 
                   x1, y1, 0);
    sendPointerSync(event);
    event = 
        MotionEvent.obtain(downTime, eventTime, 
                   MotionEvent.ACTION_UP + id2, 
                   x2, y2, 0);
    sendPointerSync(event);

    waitForIdleSync();
}

结果似乎是应用程序将这两个事件视为不同的，而不是将它们注册为单个事件。有没有更好的方法来做到这一点？

Answer 1

看看这里：https ://stackoverflow.com/questions/522312/best-practices-for-unit-testing-android-apps

我认为标准 Android 框架不可能进行多点触控单元测试。