import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;/*** @author kchang* @E-mail:kchang@163.com*/
@Target(ElementType.FIELD)//属性
@Retention(RetentionPolicy.RUNTIME)//运行时执行
@Documented
public @interface InjectView {public int value() default -1;
}

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;public class MainActivity extends Activity {@InjectView(R.id.tv)private TextView textView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);InjectUtil.autoInjectView(this);textView.setText("inject view test");}

import java.lang.reflect.Field;import android.app.Activity;/**注入框架* @author changkai* @E-mail:changkai244@163.com*/
public class InjectUtil {/*** 自动注入findViewById()* @param activity*         当前的activity*/public static void autoInjectView(Activity activity) {Class<?> classAct = activity.getClass();//获取所有的变量Field[] fields = classAct.getDeclaredFields();for (Field field : fields) {if (field.isAnnotationPresent(InjectView.class)) {//判断是否为InjectView注解InjectView injectView = field.getAnnotation(InjectView.class);//获取InjectView注解int id = injectView.value();//获取注解的值if (id > 0) {field.setAccessible(true);//允许范围私有变量try {field.set(activity, activity.findViewById(id));//给当前的变量赋值} catch (Exception e) {e.printStackTrace();}}}}}
}