How to show Show Alert Dialog from System Service?

[shridutt kothari]

Hi folks,

I am trying to show an AlertDialog from my SystemService, from /framework/base/service/../  through following code:

 

private void showDialog(CharSequence messageId) {

mDialog = new AlertDialog.Builder(getApplicationContext())

             .setMessage(messageId)

             .setPositiveButton(android.R.string.ok,

                 new DialogInterface.OnClickListener() {

                     @Override

                     public void onClick(DialogInterface dialog, int whichButton) {

                    mDialog.dismiss();

                     }

                 }

             )

             .create();

     mDialog.show();

 }

But getting following error:

A/SystemServer(2093): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

I think it is because i am trying to show dialog from SystemService, But eventually i am trying to that only.

So please can anyone tell me How can we show AlertDialog from SystemService ???

Thanks,

Shridutt Kothari,

Impetus Infotech Limited

shridut...@gmail.com

[Durgadoss Ramanathan]

Firstly, You need a reference to Context.NOTIFICATION_SERVICE.

Then create a class extending AsyncTask and in this class,
you will be able to show a Toast or a progressDialog or whatever.

Thanks,
Durga

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[Dianne Hackborn]

You need to set the window type to an appropriate system type.  You can look at the error dialogs in the activity manager for an example.

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[shridutt kothari]

Hi Dianne,

Thanks a lot for your kind answer with pointing me in right direction,

After adding following properties to my above code, now i am able to show alert dialog from My SystemService: 

  

 mDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);

mDialog.getWindow().getAttributes().privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; 

:)

Thanks Again,

Shridutt kothari,

Impetus Infotech Pvt Ltd

shridut...@gmail.com

[Darshan Khatri]

public void showSettingsAlert(){
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
    AlertDialog alertDialog = alertDialogBuilder.create();
    alertDialogBuilder.setMessage("GPS is not enabled. Do you want to go to settings menu?");
    alertDialog.setTitle("GPS is settings");

    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(intent);
        }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });


    // Showing Alert Message
    alertDialog.show();
}

i found an error cannot resolve symbol setpositivebutton