Injection inside Views

InjectView automatically injects all views & fragments inside a view.

The only things to remember is WHEN the injection takes place.

The injection of views (no fragments can be injected inside a view) will take place right after the call to super.onFinishInflate inside your custom method onFinishInflate.

In Android, Views have 3 different possible constructors :

• View(Context)
• View(Context context, AttributeSet attrs)
• View(Context context, AttributeSet attrs, int defStyleAttr)

The first constructor is usually called when creating a view by code, the 2 last constructors are used internally by Android when creating a view from a XML layout.

In Android, onFinishInflate is called automatically when inflating a view from XML (by the 2 last constructors). But it is not triggered automatically when using the first constructor.

Thus, we recommend to adopt the following pattern to create views : define all possible constructors so that your view can be created from code & XML. And call onFinishInflate manually from inside the first constructor :

public class MyView extends View {
  @InjectView(R.id.textView) private TextView view;

  public MyView(Context context) {
     super(context);
     onFinishInflate();
  }

  public MyView(Context context, AttributeSet attrs) {
     super(context, attrs);
  }

  public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
  }

  public onFinishInflate() {
     super.onFinishInflate()
     //injection takes place here,
     //right after the call to super.onFinishInflate
     view.setText("foo");
  }
}

Note : if you don't provide any custom onFinishInflate method, InjectView will add one to your view, calling super.onFinishInflate and performing the injection of views.

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A few things to note :

Views annotated using @InjectView can have any visibility modifier, including private.

Views can be identified using an id (annotation default value) or a tag (using tag parameter of the annotation).