android Activity注解方式获取UI实例 绑定事件

使用注释方式代替findVIewById 并绑定事件

示例：

package com.wf.test;

import com.wf.FindView;
import com.wf.R;
import com.wf.WfAndroidLibActivity;
import com.wf.R.layout;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class TestActivity extends WfAndroidLibActivity {
	
	
	 @FindView(id=R.id.btn1,click="btn1Click") //标注ID,绑定当前TestActivity的btn1Click方法
	 private Button btn1;
	 
	 //绑定 TestHandler中的 btn2Click方法
	 @FindView(id=R.id.btn2,click="btn2Click",className="com.wf.test.TestHandler")
	 private Button btn2;
	 
	 public void onCreate(Bundle savedInstanceState) {
	      super.onCreate(savedInstanceState);
	      this.setContentView(R.layout.main);
	      
	      btn1.setText("btn1  click"); //测试直接赋值
	      btn2.setText("btn2  click");
	      
	 }
	 public void doAction()
	 {
		 Log.d("test", "TestHandler call");
	 }
	 
	 public void btn1Click(View view){
		 ((Button)view).setText("click1");
		 Log.d("careland", "btn1---------click");
		 
	 }
}

 

package com.wf.test;



import com.wf.ViewContext;

import android.util.Log;
import android.view.View;
import android.widget.Button;

public class TestHandler{
	
	
	
	
	public void btn2Click(View view)
	{
		//获取btn1 
		Button btn1=(Button) ViewContext.getContext().get("btn1");
		Log.d("test", btn1.getText().toString());//获取btn1 的text
		
		
		//获取当前activity
		TestActivity act=(TestActivity) ViewContext.getContext().getCurrentActivity();
		act.doAction();
		
		((Button)view).setText("click2");
		Log.d("careland", "btn2 click");
	}
}

 实现源码:

package com.wf;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Inherited
@Documented
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface FindView  {
	int id();
	String touch() default "";//touch事件
	String click() default ""; //onclick事件
	String dbclick() default "";
	String itemclick() default "";
	String longclick() default "";
	String className() default "";
	
}

 

package com.wf;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
//Activity 基类  注入基类 绑定事件
public class WfAndroidLibActivity extends Activity {
    /** Called when the activity is first created. */
	private String TAG="com.careland.WfAndroidLibActivity";

	private Button btn;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       
       
    }
    
    @Override 
    public void setContentView(View view)
    {
    	super.setContentView(view);
    	GetElement();
    }
    @Override 
    public void setContentView(int id)
    {
    	super.setContentView(id);
    	GetElement();
    }
    @Override 
    public void setContentView(View view,LayoutParams param)
    {
    	super.setContentView(view, param);
    	GetElement();
    }
    /**
     * 注入属性实例 绑定事件
     * **/
    protected void GetElement()
    {
    	 ViewContext<WfAndroidLibActivity> viewContext=new ViewContext<WfAndroidLibActivity>(this);
    	 ViewContext.setContext(viewContext);
    	 viewContext.GetElement(this);
    }
}

 

package com.wf;

import java.lang.reflect.Field;
import java.lang.reflect.Proxy;

import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;

//注释处理类
public class ViewContext<T> {

	private String TAG="com.careland.ViewUtil";
	private static ThreadLocal<ViewContext> context=new ThreadLocal<ViewContext>();
	
	private  T acitivity;
	private Map<String,Object> fields;//acitvity 中 所有属性
	
	public ViewContext(T acitivity)
	{
		this.acitivity=acitivity;
		fields=new HashMap<String,Object>();
	}
	//获取当前的Activity 
	public T getCurrentActivity()
	{
		return acitivity;
	}
	//保存 和获取 当前Activity的成员变量
	public Map<String,Object> getFields()
	{
		return fields;
	}
	public Object get(String key)
	{
		return fields.get(key);
	}
	public void put(String key,Object value)
	{
		fields.put(key, value);
	}
	
	public static boolean notNullOrEmpty(String value)
	{
		return value!=null&&(!"".equals(value.trim()));
	}
	
	public static ViewContext getContext()
	{
		return context.get();
	}
	public static void setContext(ViewContext ctx)
	{
	      context.set(ctx);
	}
	//解析注释   注入成员变量实例 绑定事件
	protected void HandlerAnnotation(Field field,Activity ctx)
	{
		
		FindView fv=field.getAnnotation(FindView.class);
		if(fv!=null)
		 {
			 int viewId=fv.id();
			 String className=fv.className();
			
			 try {
				field.setAccessible(true);
				View viewobj=ctx.findViewById(viewId);
				field.set(ctx, ctx.findViewById(viewId));
				this.put(field.getName(),viewobj);//
保存成员变量到Map				String touch=fv.touch();
				String click=fv.click();
				if(viewobj instanceof View)
				{
					View view=(View) viewobj;
					if(notNullOrEmpty(touch))
					{
						view.setOnTouchListener(new ViewEventHandler(ctx,touch,className));
					}
					if(notNullOrEmpty(click))
					{
						view.setOnClickListener(new ViewEventHandler(ctx,click,className));
					}
					
//					OnItemClickListener f = (OnItemClickListener) Proxy.newProxyInstance(OnItemClickListener.class.getClassLoader(),
//                            new Class[] { OnItemClickListener.class },
//                            handler);
					
					
				}
				
			 } catch (Exception e) {
				Log.d(TAG, "自动初始化View失败",e);
			 }
			 
		 }
	}
	
	
	
	public void GetElement(Activity ctx)
	{
		Field[] fields=ctx.getClass().getDeclaredFields();
		 for(Field field:fields)
		 {
			 this.HandlerAnnotation(field, ctx);
		 }
	}
}

 

package com.wf;


import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;

//对各种事件的处理
public class ViewEventHandler implements OnClickListener, OnTouchListener,OnItemClickListener {

	private String TAG="com.wf.ViewHandler";
	private Object handler; //当前实例  默认activity 
	private String methodName; //要执行的目标方法 
	private String handlerClass;//要执行的目标类 
	public ViewEventHandler(Object handler, String method,String handlerClass) {
		this.handler=handler;
		this.methodName=method;
		this.handlerClass=handlerClass;
	}
	
	public ViewEventHandler(Object handler, String method) {
		this(handler,method,"");
	}
	/***
	 * touch 处理事件
	 * */
	@Override
	public boolean onTouch(View v, MotionEvent event) {
		ReflectMethod method=new ReflectMethod(View.class,MotionEvent.class);
		return (Boolean) method.invoke(v,event);
	}
	/**
	 *  click处理事件
	 * **/
	@Override
	public void onClick(View v) {
		ReflectMethod method=new ReflectMethod(View.class);
	    method.invoke(v);
	}
	/**
	 * 执行itemClick事件
	 * */
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		ReflectMethod method=new ReflectMethod(AdapterView.class,View.class,Integer.class,Long.class);
		method.invoke(parent,view,position,id);
		
	}
	
	//调用目标方法类
	class ReflectMethod
	{
		public Object instance;
		public Method method=null;
		
		public ReflectMethod(Class... params)
		{
			if(!"".equals(handlerClass))
			{
				this.init(handlerClass, methodName, params);
			}else
			{
				this.init(handler, methodName, params);
			}
		}
		
		public ReflectMethod(Object instance,Method method)
		{
			this.instance=instance;
			this.method=method;
			
		}
		public Object invoke(Object... params) 
		{
			try {
				return method.invoke(instance, params);
			} catch (Exception e) {
				Log.e(TAG, ""+method.getName()+" error",e);
			}
			return null;
		}
		public void init(String className,String methodName,Class... params)
		{
			try {
				Class cls = Class.forName(className);
				this.instance=cls.newInstance();
				this.init(instance,methodName,params);
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		public void init(Object instance,String methodName,Class... params)
		{
			try {
				this.instance=instance;
				this.method=instance.getClass().getDeclaredMethod(methodName,params);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	

	

}