Question

我努力让我的Android应用程序通过alertdialog退出。

点击“是”＆＃39;再次播放工作正常，因为它重新启动应用程序，你会再次去。

不幸的是，当我点击“没有”时，它只是删除了对话框警告框，我无法找出原因。

非常感谢任何帮助。

由于

@Override
       public void onClick(View v) {
           AlertDialog.Builder alert = new    AlertDialog.Builder(Task1Activity.this);
           alert.setMessage("You have guessed incorrectly three times. " +
               "The answer was " + ranNum + ". " + "Would you like to play again?")
                   .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
    public void onClick(DialogInterface dialog, int which) {

    Intent i = new Intent(Task1Activity.this, Task1Activity.class);
    startActivity(i);

    }
});

alert
.setCancelable(false)
.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Task1Activity.this.finish();
};
)
    .setTitle("Unlucky!")
    .create();

Answer 1

您正在创建活动Intent i = new Intent(Task1Activity.this, Task1Activity.class);，该活动在堆栈上添加了活动。

试试这段代码：

 final AlertDialog.Builder alertDialog = new AlertDialog.Builder(
        Task1Activity.this);
alertDialog.setTitle("Unlucky!");
alertDialog.setCancelable(false)
alertDialog.setMessage("You have guessed incorrectly three times. " +
           "The answer was " + ranNum + ". " + "Would you like to play again?");
alertDialog.setPositiveButton("YES",
        new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i)        {
                 Intent i = new Intent(Task1Activity.this, Task1Activity.class);
                 i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
                startActivity(i);
            }
        });
alertDialog.setNegativeButton("NO",
        new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                alertDialog.dismiss();   
                //getActivity().finish();
                finishAffinity();   //finish all previous activity on stack
            }
        });
alertDialog.show();

Answer 2

每次执行操作时，您都会不断添加活动：

DialogInterface.OnClickListener() {


    @Override
    public void onClick(DialogInterface dialog, int which) {

    Intent i = new Intent(Task1Activity.this, Task1Activity.class);
    startActivity(i);

    }
});

为了保持只有1项活动存活，您应该在开始新活动时finish()旧活动：

DialogInterface.OnClickListener() {


    @Override
    public void onClick(DialogInterface dialog, int which) {

    Intent i = new Intent(Task1Activity.this, Task1Activity.class);
    startActivity(i);
    finish();
    }
});

Answer 3

我认为问题是startActivity(i); 当您点击确定时，startActivity(i)会在当前Task1Activity上启动另一个Task1Activity，当您按下取消时，顶部Task1Activity正在完成，您将返回上一个{{ 1}}。用旗帜试试Task1Activity。

startActivity(i)

无法让Android应用退出

3 个答案: