Android MotionEvent.getActionIndex()和MultiTouch

概述我试图获取MotionEvent.ACTION_MOVE事件发生时的指针ID.我通过调用event.getActionIndex()来做它,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GalaxySI9000上使用Gingerbread2.3.3这是我的代码switch(event.getActionMasked()){caseMotionEvent.ACTION_MOVE

我试图获取MotionEvent.ACTION_MOVE事件发生时的指针ID.

我通过调用event.getActionIndex()来做它,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()=105-02 19:20:08.781: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=105-02 19:20:08.820: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=105-02 19:20:08.914: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=105-02 19:20:09.070: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.187: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.324: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.460: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.523: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.542: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:09.679: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=305-02 19:20:09.703: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=305-02 19:20:09.847: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=305-02 19:20:10.117: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=305-02 19:20:10.261: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.281: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.304: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.371: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.410: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.433: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.519: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.558: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=405-02 19:20:10.613: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=305-02 19:20:10.640: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=205-02 19:20:10.656: DEBUG/D(4534): getActionIndex()=0  getPointerCount()=1

解决方法:

我正在使用此代码来转储事件,并且它运行良好.

/** 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());}

我把它从this ZDNET article下来了,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,所以它也适用于你.

看起来你需要调用getPointerID而不是getActionIndex.

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