How to handle Back button with in the dialog?

问题:

I am developing an application that when the button is pressed, it opens a dialog with OK and Cancel buttons.

It works fine.

When the user presses the back button, I am handling this as follows

public boolean onKeyDown(int keyCode, KeyEvent event) 
{
    if ((keyCode == KeyEvent.KEYCODE_BACK)) 
    {

    }
 return super.onKeyDown(keyCode, event);
}

But the above method is not called. How can I handle this?

回答1:

dialog.setOnKeyListener(new Dialog.OnKeyListener() {

            @Override
            public boolean onKey(DialogInterface arg0, int keyCode,
                    KeyEvent event) {
                // TODO Auto-generated method stub
                if (keyCode == KeyEvent.KEYCODE_BACK) {
                    finish();
                    dialog.dismiss();
                }
                return true;
            }
        });

回答2:

Sounds like you want to set the OnCancelListener when you create the Dialog. It looks like this:

dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {         
    @Override
    public void onCancel(DialogInterface dialog) {
        //do whatever you want the back key to do
    }
});

回答3:

You need to override OnCancel method. This method calls on Back Key press. Here's code which works perfect to me.

 AlertDialog alertDialog;

    alertDialog.setOnCancelListener(new OnCancelListener() 
    {                   
           @Override
            public void onCancel(DialogInterface dialog) 
             {
               // TODO Auto-generated method stub

                    dialog.dismiss();                           

            }
}); 

Hope this will help you, and accept it if it is helpful to you.

Thanks..

回答4:

Try this

 new AlertDialog.Builder(this).setOnKeyListener(new DialogInterface.OnKeyListener() {

                        @Override
                        public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {

                            if(keyCode == KeyEvent.KEYCODE_BACK){
                                Logger.d(TAG, "--------- Do Something -----------");
                                return true;
                            }
                            return false;


                        }
                    })

回答5:

it is because when your Dialog opens then your window navigate its focused to Dialog. So now you have to handle key on your Dialog.

回答6:

If you are using a DialogFragment, from what I can tell the right way to do it is to override onCancel()

I noticed setOnCancelListener does not work, and setOnKeyListener works, but for me has the fun side effect that it swallows all keys if your dialog has an edit text.

回答7:

This code works:

    Dialog dlg = new Dialog(thisAct, R.style.DialogTheme);
    dlg.setContentView(view);
    dlg.setCancelable(false);
    dlg.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
    dlg.setOnKeyListener((arg0, keyCode, event) -> {
        Timber.d("onKey(%d)", keyCode);
        //{home intercepting
        if ((keyCode == KeyEvent.KEYCODE_HOME)) {
            Timber.i("HOME pressed");
            return true;
        }

        return true;
    });
    dlg.show();