The Android Starter Code
We have just  created an app called Starter and this is currently showing in the development  screen. The main Java file, MainActivity.java is already open in the workspace  and all we have to do to view it is to click on its tab. However if it is not  already open then it can be found in the projects pane at 
  app/java/com.androidjavaapps.starter,  or
  app/src/main/java/com.androidjavaapps.starter
  Double  clicking on this name opens the file in the workspace pane where we can edit it  and develop our app. 
  Default code  is generated by the IDE for whatever form factor you selected. If that was the  blank activity the code is as follows:-
  package  com.yourdomainname.starter;
    import  android.support.v7.app.ActionBarActivity;
    import  android.os.Bundle;
    import  android.view.Menu;
    import  android.view.MenuItem;
  public class  MainActivity extends ActionBarActivity {
      @Override
    protected void onCreate(Bundle  savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    }
      @Override
    public boolean onCreateOptionsMenu(Menu  menu) {
    // Inflate the menu; this adds items to  the action bar
    getMenuInflater().inflate(R.menu.menu_main,  menu);
    return true;
    }
      @Override
    public boolean  onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here.  The action bar will
    // automatically handle clicks on the  Home/Up button.
    // if you specify a parent activity in  AndroidManifest.xml.
    int id = item.getItemId();
    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
    return true;
    }
    return super.onOptionsItemSelected(item);
    }
    }