use Android-Query in Android Studio

1. in build.gradle, add:

dependencies {
  compile 'com.googlecode.android-query:android-query:0.24.3'
}

2. in Fragment class：

public static class PlaceholderFragment extends Fragment {
  private AQuery aq;
  public PlaceholderFragment() {
  }

  @Override
  public View onCreateView(LayoutInflater inflater,
                           ViewGroup container,
                           Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_main,
                                     container, 
                                     false);
    aq = new AQuery(getActivity(), rootView);
    aq.id(R.id.button1).clicked(this, "onButtonClick");
    return rootView;
  }

  public void onButtonClick(View view) {
    aq.id(R.id.editText).text("test text");
  }
}