ButterKnife

• add dependencies

    dependencies {

    compile 'com.jakewharton:butterknife:8.5.1'

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

• Or download an initialization plugin

File -> Settings -> Plugins -> Search ButterKnife, find Android ButterKnife Zeleany or Plugin Plus.

Right-click on R.layout.activity_main and select Generate -> Generate ButterKnife injections, you can choose to generate annotations corresponding to the view, and also support ViewHolder and OnClick

Manually bind ButterKnife (in activity)

@Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.activity_broadcast);

        //Initialize the butterknife frame to be placed after setView()
        ButterKnife.bind(this);
        btn.setText("The file has been initialized");

    }

//Bind the control, eliminating the repetitive operation of writing findviewbyid
    //Note that the method must not be private or static
    @BindView(R.id.btn)
    Button btn;

//Note that the method must not be private or static
    @OnClick(R.id.btn)
    public void onClick(View view) {
        btn.setText("onclick");
    }