Android Prompting an AlertDialog onBackPressed

问题:

I am trying to finish up my main menu in my application. I thought it would be a simple nice touch to add an AlertDialog in the OnBackPressed method. However for some reason I am getting all kinds of errors.

I created the AlertDialog in the OnBackPressed and show it but the app just closes when I press the back button and I get errors saying that the window is leaking.

Any idea how to fix this? I searched for about 30 minutes and couldn't find anyone else with this problem.

回答1:

Try to not call super.OnBackPressed(), this code shoul help:

@Override
public void onBackPressed() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Are you sure you want to exit?")
           .setCancelable(false)
           .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                    MyActivity.this.finish();
               }
           })
           .setNegativeButton("No", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
               }
           });
    AlertDialog alert = builder.create();
    alert.show();

}

回答2:

I created the AlertDialog in the OnBackPressed and show it but the app just closes when I press the back button and I get errors saying that the window is leaking.

If inside your OnBackPressed you are calling super.OnBackPressed() then the application will finish, as that's what the base implementation of OnBackPressed does. Don't call the super method, and the application won't close.

回答3:

If you want to call super.onBackPressed() use this code:

@Override
public void onBackPressed() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Are you sure you want to exit?")
            .setCancelable(false)
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    //finish();
                    MyActivity.this.onSuperBackPressed();
                    //super.onBackPressed();
                }
            })
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });
    AlertDialog alert = builder.create();
    alert.show();
    /*
    if (handleCancel()){
        super.onBackPressed();
    }
    */
}

public void onSuperBackPressed(){
    super.onBackPressed();
}

I just added a new public method onSuperBackPressed with the super-method to MyActivity.

Thanks goes to K_Anas for providing the excellent idea.

回答4:

call yourActivity.this.onBackPressed() in your dialog

utility.makeAlertDialog("Cancel Verification","Do you want to cancel the verification process","Cancel Verification",new DialogInterface.OnClickListener(){
        @Override
        public void onClick(DialogInterface dialog, int which) {
            utility.failureToast("OTP verification");
            Intent intent = new Intent(MobileOTPActivity.this,MobileNumberLoginActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
            finish();
            MobileOTPActivity.this.onBackPressed();
        }
    },"Close");