Butter Knife: ease to bind view in activity

ButterKnife is an open source that eases the way to bind view in activity class.

Below is the example:

1. In build gradle,
         

 compile 'com.jakewharton:butterknife:8.5.1' 
 annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

2. Suppose there are two buttons having id - android:id="@+id/hiBtn" android:id="@+id/byeBtn"

3. In activity .java class,
    a. Initialize your binding button variable as-

      @BindView(R.id.hiBtn)
      Button hiBtn;

      @BindView(R.id.byeBtn)
      Button byeBtn;

    b.
        For Activity class, in onCreate() method,

       ButterKnife.bind(this);

        For Fragment class, in onCreateView() method

       View view = inflater.inflate(R.layout.fancy_fragment, container, false);
       ButterKnife.bind(this, view);

   c.  And the button click event as,

      @OnClick(R.id.hiBtn)
      public void sayHi(Button hiBtn) {
         hiBtn.setText("Hello!");
      }

      @OnClick(R.id.byeBtn)
      public void sayBye(Button byeBtn) {
         byeBtn.setText("Bye!");
      }

Butter Knife comes with the flexibility to bind color, drawable, etc. using annotation like @BindColor, @BindDrawable.

Also, in case there are buttons having same functionality, ButterKnife provides @OnClick annotation for them as below:

@OnClick( {R.id.buttonOne, R.id.buttonTwo, R.id.buttonThree, R.id.buttonFour,
        R.id.buttonFive, R.id.buttonSix, R.id.buttonSeven, R.id.buttonEight, R.id.buttonNine})
public void buttonClicked(Button button) {
  }