Question

我试图在事件MotionEvent.ACTION_MOVE发生时获取指针ID。

我是通过调用event.getActionIndex（）来完成的，但它总是为第二个，第三个，第四个和第五个手指返回0。

我在Galaxy S I9000上使用Gingerbread 2.3.3

这是我的代码

switch (event.getActionMasked()) {
case MotionEvent.ACTION_MOVE: {
    Log.d("D","  getActionIndex()="+event.getActionIndex());
    };break;
}

这是调试结果

05-02 19:20:08.628: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1
05-02 19:20:08.781: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1
05-02 19:20:08.820: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1
05-02 19:20:08.914: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1
05-02 19:20:09.070: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.187: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.324: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.460: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.523: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.542: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:09.679: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=3
05-02 19:20:09.703: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=3
05-02 19:20:09.847: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=3
05-02 19:20:10.117: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=3
05-02 19:20:10.261: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.281: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.304: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.371: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.410: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.433: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.519: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.558: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=4
05-02 19:20:10.613: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=3
05-02 19:20:10.640: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=2
05-02 19:20:10.656: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1

Answer 1

我正在使用此代码转储事件，它运行良好。

/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event) {
   String names[] = { "DOWN" , "UP" , "MOVE" , "CANCEL" , "OUTSIDE" ,
      "POINTER_DOWN" , "POINTER_UP" , "7?" , "8?" , "9?" };
   StringBuilder sb = new StringBuilder();
   int action = event.getAction();
   int actionCode = action & MotionEvent.ACTION_MASK;
   sb.append("event ACTION_" ).append(names[actionCode]);
   if (actionCode == MotionEvent.ACTION_POINTER_DOWN
         || actionCode == MotionEvent.ACTION_POINTER_UP) {
      sb.append("(pid " ).append(
      action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
      sb.append(")" );
   }
   sb.append("[" );
   for (int i = 0; i < event.getPointerCount(); i++) {
      sb.append("#" ).append(i);
      sb.append("(pid " ).append(event.getPointerId(i));
      sb.append(")=" ).append((int) event.getX(i));
      sb.append("," ).append((int) event.getY(i));
      if (i + 1 < event.getPointerCount())
         sb.append(";" );
   }
   sb.append("]" );
   Log.d(TAG, sb.toString());
}

我把它关了this ZDNET article，所以我不能相信它。我在Android 3.0上运行，但示例代码最初是为早期版本的Android编写的，所以它也应该适用于你。

看起来你需要调用getPointerId而不是getActionIndex。

Answer 2

我使用3种方法来委派鼠标事件的责任。它在我的2.3 HTC Desire S上工作正常。它能够捕获多个触摸事件。

public void processMouseMove(int mouseX, int mouseY, int pid)
public void processMouseDown(int mouseX, int mouseY, int pid)
public void processMouseUp(int mouseX, int mouseY, int pid)


public boolean onTouch(View v, MotionEvent event) { 
    int p = event.getActionIndex();
    switch(event.getActionMasked()){
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_POINTER_DOWN:
            processMouseDown((int)event.getX(p), (int)event.getY(p), event.getPointerId(p));                
        break;              
        case MotionEvent.ACTION_POINTER_UP:                 
        case MotionEvent.ACTION_UP:
            processMouseUp((int)event.getX(p), (int)event.getY(p), event.getPointerId(p));
            break;
        case MotionEvent.ACTION_MOVE:
            final int historySize = event.getHistorySize();
            final int pointerCount = event.getPointerCount();
            for (int h = 0; h < historySize; h++) {
                 for (int p1 = 0; p1 < pointerCount; p1++) {
                    processMouseMove((int)event.getHistoricalX(p1, h), (int)event.getHistoricalY(p1, h), event.getPointerId(p1));
                 }
            }
            for (int p1 = 0; p1 < event.getPointerCount(); p1++) {

                processMouseMove((int)event.getX(p1), (int)event.getY(p1), event.getPointerId(p1));
            }
    }
    return true;
}

Answer 3

使用MotionEventCompat。

// get pointer index from the event object

int pointerIndex = MotionEventCompat.getActionIndex(event);

// get masked (not specific to a pointer) action

int maskedAction = MotionEventCompat.getActionMasked(event);

Android MotionEvent.getActionIndex（）和MultiTouch

3 个答案: