java - onBackpressed() 中的问题

Question

实际上我的问题是，当我按下后退按钮时，它会显示一个对话框，同时应用程序完成时没有对键进行任何操作？谁能解决这个问题？

@Override
public void onBackPressed() {
    super.onBackPressed();
    AlertDialog.Builder ab = new AlertDialog.Builder(this);
    ab.setMessage("Really want to exit");
    ab.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            finish();
        }
    });
    ab.setNegativeButton("No", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Main.super.onBackPressed();
        }
    });
    ab.create();
    ab.show();
}

Answer 1

从方法中移除 super.onBackPressed();，只保留在 onClick() 中

@Override
public void onBackPressed() {
    super.onBackPressed(); //remove it

}

似乎你在两个按钮上执行相同的操作，你应该从 negativeButton 中删除 Main.super.onBackPressed()

ab.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        super.onBackPressed();
    }
});
ab.setNegativeButton("No", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        ab.dismiss();
    }
});