点击弹出的Dialog中Item后出现：该如何处理

2012-06-19

点击弹出的Dialog中Item后出现：我照着Hello.Android.3rd.Edition.pdf写了一个九宫格游戏，能正常运行，运行

点击弹出的Dialog中Item后出现：
我照着Hello.Android.3rd.Edition.pdf写了一个九宫格游戏，能正常运行，运行后如图所示：

然后点击New Game:
弹出Dialog:

点击任意难度进入，出现错误：android has stopped unexpectedly

Logcat:

Java code

12-14 01:16:29.082: D/Sudoku(288): clicked on……012-14 01:16:29.132: D/Sudoku(288): onCreate12-14 01:16:29.263: D/Sudoku(288): onSizeChanged:width 35.555557,height 47.7777812-14 01:16:29.372: D/AndroidRuntime(288): Shutting down VM12-14 01:16:29.372: W/dalvikvm(288): threadid=1: thread exiting with uncaught exception (group=0x4001d800)12-14 01:16:29.412: E/AndroidRuntime(288): FATAL EXCEPTION: main12-14 01:16:29.412: E/AndroidRuntime(288): java.lang.NullPointerException12-14 01:16:29.412: E/AndroidRuntime(288):     at org.example.Sudoku.PuzzleView.onDraw(PuzzleView.java:162)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.View.draw(View.java:6740)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.drawChild(ViewGroup.java:1640)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.View.draw(View.java:6743)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.widget.FrameLayout.draw(FrameLayout.java:352)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.drawChild(ViewGroup.java:1640)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.drawChild(ViewGroup.java:1638)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.View.draw(View.java:6743)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.widget.FrameLayout.draw(FrameLayout.java:352)12-14 01:16:29.412: E/AndroidRuntime(288):     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewRoot.draw(ViewRoot.java:1407)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewRoot.performTraversals(ViewRoot.java:1163)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.os.Handler.dispatchMessage(Handler.java:99)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.os.Looper.loop(Looper.java:123)12-14 01:16:29.412: E/AndroidRuntime(288):     at android.app.ActivityThread.main(ActivityThread.java:4627)12-14 01:16:29.412: E/AndroidRuntime(288):     at java.lang.reflect.Method.invokeNative(Native Method)12-14 01:16:29.412: E/AndroidRuntime(288):     at java.lang.reflect.Method.invoke(Method.java:521)12-14 01:16:29.412: E/AndroidRuntime(288):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)12-14 01:16:29.412: E/AndroidRuntime(288):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)12-14 01:16:29.412: E/AndroidRuntime(288):     at dalvik.system.NativeStart.main(Native Method)

我前面只知道这种错误是由于没注册Activity造成的，但我全部注册了
请问从这个日志能看出错误在哪吗？有很多个CLASS，我也不知道该帖哪段代码出来

Java code

  private static final String TAG = "Sudoku";        private void openNewGameDialog() {        new AlertDialog.Builder(this).setTitle(R.string.new_game_title).setItems(R.array.difficulty,new DialogInterface.OnClickListener() {                        public void onClick(DialogInterface dialoginterface, int i) {                startGame(i);                // TODO Auto-generated method stub            }        }).show();    }        private void startGame(int i) {        Log.d(TAG, "clicked on……"+i);        Intent intent = new Intent(Sudoku.this,Game.class);        intent.putExtra(Game.KEY_DIFFICULTY, i);        startActivity(intent);        //Start game click here    }}

先谢谢各位了，请帮我看看，第一次做就受挫了……

[解决办法]
PuzzleView.java的162行，空指针
[解决办法]

Java code

 int movesleft = 9 - game.getUsedTiles(i, j).length;
[解决办法]
探讨

我是自己在前面加了句IF
Java code

if(getUsedTiles(i, j) != null){
int movesleft = 9 - game.getUsedTiles(i, j).length;
……
}


算是临时解决了问题，不知道有没有什么隐患

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