xUtils系列之ViewUtils-ViewEvent注解

xUtils支持View的21个事件注解,如下:

这里选择OnClick举例:
OnClick注解定义:

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@EventBase(
        listenerType = View.OnClickListener.class,
        listenerSetter = "setOnClickListener",
        methodName = "onClick")
public @interface OnClick {
    int[] value(); //value是数组,可以在注解中输入多个控件ID.
    int[] parentId() default 0;
}

ViewUtils中的注解部分:

// inject event
Method[] methods = handlerType.getDeclaredMethods();
if (methods != null && methods.length > 0) {
    for (Method method : methods) {
        Annotation[] annotations = method.getDeclaredAnnotations();
        if (annotations != null && annotations.length > 0) {
            for (Annotation annotation : annotations) {
                Class<?> annType = annotation.annotationType();
                if (annType.getAnnotation(EventBase.class) != null) {
                    method.setAccessible(true);
                    try {
                        // ProGuard：-keep class * extends java.lang.annotation.Annotation { *; }
                        Method valueMethod = annType.getDeclaredMethod("value");
                        Method parentIdMethod = null;
                        try {
                            parentIdMethod = annType.getDeclaredMethod("parentId");
                        } catch (Throwable e) {
                        }
                        Object values = valueMethod.invoke(annotation);
                        Object parentIds = parentIdMethod == null ? null : parentIdMethod.invoke(annotation);
                        int parentIdsLen = parentIds == null ? 0 : Array.getLength(parentIds);
                        int len = Array.getLength(values);
                        for (int i = 0; i < len; i++) {
                            ViewInjectInfo info = new ViewInjectInfo();
                            info.value = Array.get(values, i);
                            info.parentId = parentIdsLen > i ? (Integer) Array.get(parentIds, i) : 0;
                            EventListenerManager.addEventMethod(finder, info, annotation, handler, method);
                        }
                    } catch (Throwable e) {
                        LogUtils.e(e.getMessage(), e);
                    }
                }
            }
        }
    }
}

使用方法:

@ContentView(R.layout.activity_main)
public class MainActivity extends Activity {


	@OnClick({ R.id.tv1_include, R.id.tv2_include })// 注意输入值是数组形式
	public void OnClick(View view) {
		switch (view.getId()) {
		case R.id.tv1_include:
			Toast.makeText(getApplicationContext(), "1 clicked~", Toast.LENGTH_SHORT).show();
			break;
		case R.id.tv2_include:
			Toast.makeText(getApplicationContext(), "2 clicked~", Toast.LENGTH_SHORT).show();
			break;
		default:
			break;
		}
	}


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ViewUtils.inject(this);
	}
}