android KEYCODE_BACK监听处理

@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode == KeyEvent.KEYCODE_BACK ){showDailog("亲！真的要退出吗？");}//return super.onKeyDown(keyCode, event);return false;//当有onclickListener时候，上面的写法showDailog会直接退出程序，不知到为什么}private void showDailog(String msg) {AlertDialog.Builder builder = new Builder(this);builder.setIcon(android.R.drawable.ic_dialog_alert);builder.setTitle("确认退出");builder.setMessage(msg);//builder.setCancelable(false);builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub//Intent startMain = new Intent(Intent.ACTION_MAIN);//startMain.addCategory(Intent.CATEGORY_HOME);//startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//startActivity(startMain);//跳转到home下finish();}});builder.setNegativeButton("取消", null);builder.create().show();}
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