OnBackPressedCallback 未调用 - Activitiy 立即终止

Question

你好，

在我的 MainActivity 中添加

OnBackPressedDispatcher

和

OnBackPressedCallback

，因为

onBackPressed

已被弃用。

旧用法：

   @Override
public void onBackPressed() {
    //Display alert message when back button has been pressed
    alertDialogShow();
}

新用法： 将其放入我的初始化侦听器调用中

MainActivity

onCreate()

- initListeners()

    onBackPressedCallback = new OnBackPressedCallback(true) {
        @Override
        public void handleOnBackPressed() {
            //Display alert message when back button has been pressed
            alertDialogShow();
        }
    };

    onBackPressedDispatcher = new OnBackPressedDispatcher();
    onBackPressedDispatcher.addCallback(this,onBackPressedCallback);

但是alterDialogShow()方法永远不会被调用并且活动会立即终止。 我该如何解决这个问题。

谢谢， 亚历杭德罗

Answer 1

根据我上面的评论。这是一种方法。

   OnBackPressedCallback onBackPressedCallback = new OnBackPressedCallback(true) {
        @Override
        public void handleOnBackPressed() {
            // Create an AlertDialog to confirm the action
            new AlertDialog.Builder(YourActivity.this)
                .setTitle("Confirm Action")
                .setMessage("Are you sure you want to go back?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Perform the desired action when the user confirms
                        // For example, you can call super.onBackPressed() to go back
                        super.onBackPressed();
                    }
                })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do nothing or handle the cancel action here
                    }
                })
                .show();
        }
    };

    // Add the callback to the back stack
    getOnBackPressedDispatcher().addCallback(this, onBackPressedCallback);
}