android - 如何为 Android 测试生成缩放/捏合手势

Question

我正在尝试生成缩放/捏合手势进行测试，我尝试使用 Android API MotionEvent.obtain()，但发现很难实现缩放/捏合事件。

我从 MotionEvent.obtain 引用了 API .你能告诉我正确的方法吗？

这是我的实现:

//for zoom, we need four points coordinations: start0, start1, end0, end1

Instrumentation inst;

// action down event
MotionEvent event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, 1, prop_start0, pointerCoords_start0, 0,  0, 0, 0, 0, 0, 0, 0 );
inst.sendPointerSync(event);

// action pointer 2 down event
event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_POINTER_2_DOWN, 2, properties_start0_1, pointerCoords_start0_1, 0, 0, 0, 0, 0, 0, 0, 0);
inst.sendPointerSync(event);

// action move events
duration = 1000; //1000 ms
event_interval = 10;//time interval between consecutive events 10ms 
moveEventNum = duration / event_interval; 
stepx0 = (end0.x - start0.x)/moveEventNum;
stepy0 = (end0.y - start0.y)/moveEventNum;
stepx1 = (end1.x - start1.x)/moveEventNum;
stepy1 = (end1.y - start1.y)/moveEventNum;

move_event0= start0;
move_event1 = start1;
for ( int i = 0; i < moveEventNum; i++) {
       //  [generate middle points here ]
       mov_event0.x += stepx0;
       mov_event0.y += stepy0;
       mov_event1.x += stepx1;
       mov_event1.y += stepy1;

      eventTime += event_interval;

      event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, 2, properties_move_event, pointerCoords_move_event0_1, 0, 0, 0, 0, 0, 0, 0, 0); 

     inst.sendPointerSync(event);
}

event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_POINTER_2_UP, 2, properties_end0_1, pointerCoords_end0_1, 0, 0, 0, 0, 0, 0, 0, 0);
inst.sendPointerSync(event);

event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP, 1, end1, pointerCoords_end1, 0, 0, 0, 0, 0, 0, 0, 0 );
inst.sendPointerSync(event);

Answer 1

嗯，我找到了问题。

问题:

在使用obtain() API时，我们必须在每个事件中设置点的压力和大小。

对于

obtain(long, long, int, int, android.view.MotionEvent.PointerProperties[], 
android.view.MotionEvent.PointerCoords[], int, int, float, float, int, int, int, int)

PointerCoords[]，我们要设置压力和大小为1，默认值为0。

对于

public static MotionEvent obtain (long downTime, long eventTime, int action,
         float x, float y, int metaState)

     Create a new MotionEvent, filling in a subset of the basic motion values. 
    Those not specified here are: device id (always 0), pressure and size (always 1), 
x and y precision (always 1), and edgeFlags (always 0).

since the default pressure and size are 1, so we don't need to set them.

创建手势的技巧:

1.遵循真实的手势序列，因为我们要模拟真实的手势

• 重写 onTouchEvent() 来检查接收到的真实事件应用。这些事件也可以用来比较真实的用户触摸事件和生成的触摸事件 以浏览器为例示例:

  a) @Override public boolean onTouchEvent(MotionEvent event) { Log.i("WebView", event.toString() + event.getAction()); bool 值 = super.onTouchEvent(事件);返回rt； }

• 手动触摸屏幕从a)中的onTouchEvent()获取真正的手势序列。我们可以在生成事件时遵循事件顺序。-- 如果我们不遵循手势事件序列，检测到的事件可能会被拒绝。

• 这是一个有效的缩放手势事件序列，(所有事件的downTime都是一样的)

  我。 ACTION_DOWN 一个起点

  二。两个起点的ACTION_POINTER_2_DOWN

  iii.ACTION_MOVE 两个中间点

  四。 ACTION_POINTER_2_UP 两个端点

  v.一个端点的 ACTION_UP

<强>2。正确使用 API MotionEvent.获取

• 有两个最常用的obtain() API。

public static MotionEvent 获取 (long downTime, long eventTime, int action, float x， float y，int 元状态)

与

public static MotionEvent 获取(long, long, int, int, android.view.MotionEvent.PointerProperties[],android.view.MotionEvent.PointerCoords[], int, int, float, float, int, int, int, int)

第一个通常用于单点手势，如滑动、滚动、单击等。此功能的参数(压力、大小、xPresion、yPresion)均设​​置为1。

第二个是更通用的一个，可以用于多点触控事件的生成。而对于第二个，我们必须将每个触摸点的pointerCoords中的压力，大小设置为1。

以下是生成缩放手势的示例:

public static void generateZoomGesture(Instrumentation inst,
        long startTime, boolean ifMove, GestureInfo.Point startPoint1,
        GestureInfo.Point startPoint2, GestureInfo.Point endPoint1,
        GestureInfo.Point endPoint2, int duration) {

    if (inst == null || startPoint1 == null
            || (ifMove && endPoint1 == null)) {
        return;
    }

    long eventTime = startTime;
    long downTime = startTime;
    MotionEvent event;
    float eventX1, eventY1, eventX2, eventY2;

    eventX1 = startPoint1.x;
    eventY1 = startPoint1.y;
    eventX2 = startPoint2.x;
    eventY2 = startPoint2.y;

    // specify the property for the two touch points
    PointerProperties[] properties = new PointerProperties[2];
    PointerProperties pp1 = new PointerProperties();
    pp1.id = 0;
    pp1.toolType = MotionEvent.TOOL_TYPE_FINGER;
    PointerProperties pp2 = new PointerProperties();
    pp2.id = 1;
    pp2.toolType = MotionEvent.TOOL_TYPE_FINGER;

    properties[0] = pp1;
    properties[1] = pp2;

    //specify the coordinations of the two touch points
    //NOTE: you MUST set the pressure and size value, or it doesn't work
    PointerCoords[] pointerCoords = new PointerCoords[2];
    PointerCoords pc1 = new PointerCoords();
    pc1.x = eventX1;
    pc1.y = eventY1;
    pc1.pressure = 1;
    pc1.size = 1;
    PointerCoords pc2 = new PointerCoords();
    pc2.x = eventX2;
    pc2.y = eventY2;
    pc2.pressure = 1;
    pc2.size = 1;
    pointerCoords[0] = pc1;
    pointerCoords[1] = pc2;

    //////////////////////////////////////////////////////////////
    // events sequence of zoom gesture
    // 1. send ACTION_DOWN event of one start point
    // 2. send ACTION_POINTER_2_DOWN of two start points
    // 3. send ACTION_MOVE of two middle points
    // 4. repeat step 3 with updated middle points (x,y),
    //      until reach the end points
    // 5. send ACTION_POINTER_2_UP of two end points
    // 6. send ACTION_UP of one end point
    //////////////////////////////////////////////////////////////

    // step 1
    event = MotionEvent.obtain(downTime, eventTime, 
                MotionEvent.ACTION_DOWN, 1, properties, 
                pointerCoords, 0,  0, 1, 1, 0, 0, 0, 0 );

    inst.sendPointerSync(event);

    //step 2
    event = MotionEvent.obtain(downTime, eventTime, 
                MotionEvent.ACTION_POINTER_2_DOWN, 2, 
                properties, pointerCoords, 0, 0, 1, 1, 0, 0, 0, 0);

    inst.sendPointerSync(event);

    //step 3, 4
    if (ifMove) {
        int moveEventNumber = 1;
        moveEventNumber = duration / EVENT_MIN_INTERVAL;

        float stepX1, stepY1, stepX2, stepY2;

        stepX1 = (endPoint1.x - startPoint1.x) / moveEventNumber;
        stepY1 = (endPoint1.y - startPoint1.y) / moveEventNumber;
        stepX2 = (endPoint2.x - startPoint2.x) / moveEventNumber;
        stepY2 = (endPoint2.y - startPoint2.y) / moveEventNumber;

        for (int i = 0; i < moveEventNumber; i++) {
            // update the move events
            eventTime += EVENT_MIN_INTERVAL;
            eventX1 += stepX1;
            eventY1 += stepY1;
            eventX2 += stepX2;
            eventY2 += stepY2;

            pc1.x = eventX1;
            pc1.y = eventY1;
            pc2.x = eventX2;
            pc2.y = eventY2;

            pointerCoords[0] = pc1;
            pointerCoords[1] = pc2;

            event = MotionEvent.obtain(downTime, eventTime,
                        MotionEvent.ACTION_MOVE, 2, properties, 
                        pointerCoords, 0, 0, 1, 1, 0, 0, 0, 0);

            inst.sendPointerSync(event);
        }
    }

    //step 5
    pc1.x = endPoint1.x;
    pc1.y = endPoint1.y;
    pc2.x = endPoint2.x;
    pc2.y = endPoint2.y;
    pointerCoords[0] = pc1;
    pointerCoords[1] = pc2;

    eventTime += EVENT_MIN_INTERVAL;
    event = MotionEvent.obtain(downTime, eventTime,
                MotionEvent.ACTION_POINTER_2_UP, 2, properties, 
                pointerCoords, 0, 0, 1, 1, 0, 0, 0, 0);
    inst.sendPointerSync(event);

    // step 6
    eventTime += EVENT_MIN_INTERVAL;
    event = MotionEvent.obtain(downTime, eventTime, 
                MotionEvent.ACTION_UP, 1, properties, 
                pointerCoords, 0, 0, 1, 1, 0, 0, 0, 0 );
    inst.sendPointerSync(event);
}