example.java

public MyActivity extends Activity implements View.OnClickListener {
  
  private View child1;
  private View child2;
  
  onCreate() {
    // initilize stuff...
    child1.setOnClickListener(this);
    child2.setOnClickListener(this);
  }
  
  public boolean onClick(View v) {
    switch (v.getId()) {
      case R.id.child_1_id:
        // logic
        break;
      case R.id.child_2_id:
        // more complex logic, maybe call another method 
        break;
    }
  }
  
}

Or better yet, if you wire the xml up correctly (and your custom class is an activity) you can just set the android:onClick attribute to be "onClick" rather than having to set the on click listeners for the views.