Simple Message Dialog

// Show Dialog
AlertDialog.Builder builder = new AlertDialog.Builder(RootActivity.this);
builder.setMessage(url)
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
            RootActivity.this.finish();
      }
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
            dialog.cancel();
      }
});
AlertDialog alert = builder.create();
alert.show();