ImageButton Click on Change Background Image

step 1:
<ImageButton    
android:id="@+id/alarm"    
android:layout_width="25dp"    
android:layout_height="25dp"    
android:background="@drawable/alarm_on" />
step 2:
public class MainActivity extends AppCompatActivity {
ImageButton alarm;
int a;
@Overrideprotected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_remainter);

alarm= (ImageButton)findViewById(R.id.alarm);
View.OnClickListener imgButtonHandler = new View.OnClickListener() {

    public void onClick(View v) {
       boolean clicked = true;
public void onClick(View v) {
    if(!clicked){
        b1.setBackgroundColor(Color.RED);
        clicked = true;

        //here i will update the database
    }else{
        b1.setBackgroundColor(Color.BLUE);
        clicked = false;
        //here i will update the database    }
}
};alarm.setOnClickListener(imgButtonHandler);