我不想編碼動態壁紙,我需要一個當前按下的點的列表。我將這些點存儲在SpareArray中(基本上與HashMap相同,但速度更快)。Android MultiTouch在擡起手指時崩潰
現在,當我用兩根手指(1和2)觸摸屏幕並擡起手指(第一根手指2,而不是1)時,它就起作用。但是當我首先舉起手指1時,該應用程序崩潰。我必須以相反的順序擡起我的手指,然後按下它們。
@Override
public void onTouchEvent(MotionEvent event) {
for (int i = 0; i < event.getPointerCount(); i++) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_POINTER_DOWN:
case MotionEvent.ACTION_MOVE:
int pID = event.getPointerId(i);
Points.put(pID, new Point((int)event.getX(pID), (int)event.getY(pID))); //CRASH HERE
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
Points.remove(event.getPointerId(i));
break;
}
}
super.onTouchEvent(event);
handler.post(drawRunnable);
}
我總是得到一個 「java.lang.IllegalArgumentException異常:pointerIndex超出範圍」 異常
感謝,多米尼克
編輯:堆棧跟蹤
07-16 19:55:58.354: E/AndroidRuntime(4986): FATAL EXCEPTION: main
07-16 19:55:58.354: E/AndroidRuntime(4986): java.lang.IllegalArgumentException: pointerIndex out of range
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.view.MotionEvent.nativeGetAxisValue(Native Method)
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.view.MotionEvent.getX(MotionEvent.java:1974)
07-16 19:55:58.354: E/AndroidRuntime(4986): at net.ta.livewp.LiveWallpaper$xEngine.onTouchEvent(LiveWallpaper.java:103)
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:1047)
07-16 19:55:58.354: E/AndroidRuntime(4986): at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.os.Looper.loop(Looper.java:137)
07-16 19:55:58.354: E/AndroidRuntime(4986): at android.app.ActivityThread.main(ActivityThread.java:4575)
07-16 19:55:58.354: E/AndroidRuntime(4986): at java.lang.reflect.Method.invokeNative(Native Method)
07-16 19:55:58.354: E/AndroidRuntime(4986): at java.lang.reflect.Method.invoke(Method.java:511)
07-16 19:55:58.354: E/AndroidRuntime(4986): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
07-16 19:55:58.354: E/AndroidRuntime(4986): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
07-16 19:55:58.354: E/AndroidRuntime(4986): at dalvik.system.NativeStart.main(Native Method)
今後可以發現,如果你扔任何類型的'Exception',你應該張貼您的日誌,而不是'Exception'的唯一名字。你的日誌將指向一個特定的代碼行,它最終會對你和任何試圖幫助你的人有用。 – adneal 2012-07-16 17:51:20
對不起,我編輯了我的帖子,但是行標記了(向右滾動) – teamalpha5441 2012-07-16 17:57:17