how to an alert dialog on android

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setMessage("AlertDialog Message");
builder.setTitle("AlertDialog Title");
builder.setCancelable(false);

builder.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        dialog.cancel();
    }
});

builder.setPositiveButton(getResources().getString(R.string.sure), new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(AccountActivity.this, R.string.log_out_success,
                Toast.LENGTH_LONG).show();
       
    }
});

AlertDialog alert = builder.create();

alert.show(); // show the Alert Dialog