Butter Knife In Android

Butter knife a library by jakewharton and is used for injecting views.The @Bind annotation is used to bind views or inject views and perform the cast of the correct type.

@OnClick(R.id.pagerStarted) is used to add ClickListener to the views.

Add the given below dependency to your build.gradle file

compile 'com.jakewharton:butterknife:7.0.1'

Don't forget to initialize the butter knife in oncreate : 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);
    ButterKnife.bind(this);
    initViews();
}

How to bind views or inject views :-

for  e.g.

@Bind(R.id.wePager)
ViewPager wePager;
SlidePagerAdapter mPagerAdapter;
@Bind(R.id.pagerStarted)
Button pagerStarted;

how to add on click listener :-

@OnClick({R.id.numChange, R.id.newNum})
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.numChange:
            if (ConnectionCheck.isConnectionAvailable(ChangeNumber.this)) {
                changeNumberCall();
            } else {
                Toast.makeText(ChangeNumber.this, R.string.internet_check, Toast.LENGTH_SHORT).show();
            }
            break;
    }
}

Features provided by butter knife :-

• Binding views and other resources
• Event listeners
• Recycler view implementation

Goal :-

This library help developers like us to write better code and clean code.

Pros :-

• No need to replace and activity.
• Injection for clcik listeners are available.
• Provide injection in adapter also
• Provide injection in fragment

Cons :-

• Don't provide injection in pojo.

THANKS