Q:

How to show appropriate icon on dialog box

I have an application that allows the users to delete video files. When I press the delete button, I am using 
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
        case DialogInterface.BUTTON_POSITIVE:
            // mycode........
            break;
        case DialogInterface.BUTTON_NEGATIVE:
            // mycode.....
            break;
        }
    }
};

But this message doesn't have a warning or delete icon as we see in android devices. Can anyone help me in getting those icons or using any other alert dialogs that can show those icons?

A:

I tend to use AlertDialog.Builder like they show in the official doc example
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();
       }
   })
   //Set your icon here
   .setTitle("Alert!")
   .setIcon(R.drawable.icon);
AlertDialog alert = builder.create();
 alert.show();//showing the dialog

As for the actual icon look inside your sdk folder/platforms/android version #/data/res/drawable-mdpi or something

A:

In order to set the default Dialog icons use:
.setIcon(android.R.drawable.ic_dialog_alert)

There are a few more icons available:

android.R.drawable.ic_dialog_dialer
android.R.drawable.ic_dialog_info
android.R.drawable.ic_dialog_email
android.R.drawable.ic_dialog_map

