@Override public void onBackPressed() {  new AlertDialog.Builder(this)    .setIcon(R.drawable.ic_launcher)//這里是顯示提示框的圖片信息，我這里使用的默認(rèn)android/214259.html">androidApp的圖標(biāo)    .setTitle("確認(rèn)對(duì)話框")    .setMessage("您真的要退出嗎？")    .setNegativeButton("取消",null)    .setPositiveButton("確認(rèn)", new DialogInterface.OnClickListener() {     @Override     public void onClick(DialogInterface dialog, int which) {      finish();     }    }).show(); }