簡單使用自定義ButterKnife

縣創建好項目之後，點擊File，新建一個Module,再選擇Library,將Module添加依賴

新建自定義註解@interface
1，查找控件

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface BindView {
    @IdRes int value() default View.NO_ID;
}

2,

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface BindString {
 
    @StringRes int value() default -1;
}

3,

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface BindOnclick {
 
@IdRes  int[] value();
 
}

4,再建立一個類，將Activity對象傳來

public class Butterknife {
 
    public static void bind(final Activity activity){
        //1,拿到類模板
        Class<Activity> clazz = (Class<Activity>) activity.getClass();//泛型中手寫activity，強轉對象
        //2,拿到所有屬性
        Field[] declaredFields = clazz.getDeclaredFields();
        for (Field field : declaredFields) {
            //設置允許
            field.setAccessible(true);
            //是否被對應的註解修飾
            if (field.isAnnotationPresent(BindView.class)){
                //拿到修飾改屬性的註解
                BindView bindView = field.getAnnotation(BindView.class);
                int id = bindView.value();
                //根據id拿到xml中的控件對象
                View view = activity.findViewById(id);
 
 
 
                //給屬性賦值
                try {
                    field.set(activity,view);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                if (field.isAnnotationPresent(BindString.class)){
                    BindString bindStringAnnotation = field.getAnnotation(BindString.class);
                    int stringValue = bindStringAnnotation.value();
                    String string = activity.getResources().getString(stringValue);
                    try {
                        field.set(activity,string);
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    }
                }
 
 
 
 
 
            }
            Method[] declaredMethods = clazz.getDeclaredMethods();
            for (final Method method : declaredMethods) {
                method.setAccessible(true);
                if (method.isAnnotationPresent(BindOnclick.class)){
                    BindOnclick onClickAnnotation = method.getAnnotation(BindOnclick.class);
                    int[] ids = onClickAnnotation.value();
                    for (int id : ids) {
                        View view = activity.findViewById(id);
                        view.setOnClickListener(new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                try {
                                    method.invoke(activity,v);
                                } catch (IllegalAccessException e) {
                                    e.printStackTrace();
                                } catch (InvocationTargetException e) {
                                    e.printStackTrace();
                                }
                            }
                        });
                    }
                }
 
            }
        }
    }
 
}

5.最後和Activity綁定，在使用頁面中的oncreate方法中添加：
Butterknife.bind(this);
然後就可以直接使用了

比如：