Android点击返回键back时弹出对话框Dialog

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public boolean onKeyDown(int keyCode, KeyEvent event) {      if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {          ExitDialog(MainActivity.this).show();          return true;      }            return super.onKeyDown(keyCode, event);  }

private Dialog ExitDialog(Context context) {      AlertDialog.Builder builder = new AlertDialog.Builder(context);      builder.setIcon(R.drawable.icon);      builder.setTitle("弹出对话框");      builder.setMessage("确定要××××吗，O(∩_∩)O哈哈~");      builder.setPositiveButton("确定",              new DialogInterface.OnClickListener() {                  public void onClick(DialogInterface dialog, int whichButton) {                              //××××操作代码                }              });      builder.setNegativeButton("取消",              new DialogInterface.OnClickListener() {                  public void onClick(DialogInterface dialog, int whichButton) {                  }              });      return builder.create();  }

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