当我按下后退按钮时，我的应用程序立即退出，不等待用户确认

Question

当我按下后退按钮时，应用程序立即退出并且不等待用户确认“你确定吗？”

这是我的onbackpressed代码

@Override
public void onBackPressed() {
    super.onBackPressed();

    new AlertDialog.Builder(this)
            .setIcon(android.R.drawable.ic_dialog_alert)
            .setTitle("Closing Application")
            .setMessage("Are you sure you want to close this application?")
            .setPositiveButton("Yes", new DialogInterface.OnClickListener()
            {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                    System.exit(0);
                }

            })
            .setNegativeButton("No", null)
            .show();

}

此处有人可以帮助我

Answer 1

您需要在对话框出现之前删除super.onBackPressed();

试试这种方式，

@Override
public void onBackPressed() {

    new AlertDialog.Builder(this)
            .setIcon(android.R.drawable.ic_dialog_alert)
            .setTitle("Closing Application")
            .setMessage("Are you sure you want to close this application?")
            .setPositiveButton("Yes", new DialogInterface.OnClickListener()
            {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    super.onBackPressed();
                }

            })
            .setNegativeButton("No", null)
            .show();

}

Answer 2

删除此行

 super.onBackPressed();

Answer 3

要从后台删除应用，您也可以使用以下代码。

@Override
public void onBackPressed() {

new AlertDialog.Builder(this)
        .setIcon(android.R.drawable.ic_dialog_alert)
        .setTitle("Closing Application")
        .setMessage("Are you sure you want to close this application?")
        .setPositiveButton("Yes", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                super.onBackPressed();
                moveTaskToBack(true);                          
                android.os.Process.killProcess(android.os.Process.myPid());
                System.exit(1);
            }

        })
        .setNegativeButton("No", null)
        .show();

}