Ioc依赖注入，使你的项目告别findViewById

MainActivity

package test.dbing.com.ioctest;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;import test.dbing.com.ioctest.ioc.IocView;public class MainActivity extends BaseActivity {    @IocView(id = R.id.main_name_bt,click="btnClick",longClick = "longClk")Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void btnClick(View v){        Toast.makeText(MainActivity.this,"click",Toast.LENGTH_LONG).show();    }    public void longClk(View v){        Toast.makeText(MainActivity.this,"longClk",Toast.LENGTH_LONG).show();    }}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:id="@+id/main_name_bt"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!" /></RelativeLayout>

BaseActivity

import android.app.Activity;import android.text.TextUtils;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import java.lang.reflect.Field;import test.dbing.com.ioctest.ioc.IocEventListener;import test.dbing.com.ioctest.ioc.IocSelect;import test.dbing.com.ioctest.ioc.IocView;public class BaseActivity extends Activity {    @Override    public void setContentView(int layoutResID) {        super.setContentView(layoutResID);        initIocView();    }    @Override    public void setContentView(View view) {        super.setContentView(view);        initIocView();    }    @Override    public void setContentView(View view, ViewGroup.LayoutParams params) {        super.setContentView(view, params);    }    public void initIocView(){        Field[] fields = getClass().getDeclaredFields();        if(fields!=null && fields.length>0){            for(Field field : fields){                try {                    field.setAccessible(true);                    if(field.get(this)!= null )                        continue;                    IocView viewInject = field.getAnnotation(IocView.class);                    if(viewInject!=null){                        int viewId = viewInject.id();                        field.set(this,findViewById(viewId));                        setListener(field,viewInject.click(), IocEventListener.CLICK);                        setListener(field,viewInject.longClick(), IocEventListener.LONGCLICK);                        setListener(field,viewInject.itemClick(), IocEventListener.ITEMCLICK);                        setListener(field,viewInject.itemLongClick(), IocEventListener.ITEMLONGCLICK);                        IocSelect select = viewInject.select();                        if(!TextUtils.isEmpty(select.selected())){                            setViewSelectListener(field,select.selected(),select.noSelected());                        }                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        }    }    /**     * 设置view的监听器.     *     * @param field the field     * @param methodName the method name     * @param method the method     * @throws Exception the exception     */    private void setListener(Field field,String methodName,int method)throws Exception{        if(methodName == null || methodName.trim().length() == 0)            return;        Object obj = field.get(this);        switch (method) {            case IocEventListener.CLICK:                if(obj instanceof View){                    ((View)obj).setOnClickListener(new IocEventListener(this).click(methodName));                }                break;            case IocEventListener.ITEMCLICK:                if(obj instanceof AbsListView){                    ((AbsListView)obj).setOnItemClickListener(new IocEventListener(this).itemClick(methodName));                }                break;            case IocEventListener.LONGCLICK:                if(obj instanceof View){                    ((View)obj).setOnLongClickListener(new IocEventListener(this).longClick(methodName));                }                break;            case IocEventListener.ITEMLONGCLICK:                if(obj instanceof AbsListView){                    ((AbsListView)obj).setOnItemLongClickListener(new IocEventListener(this).itemLongClick(methodName));                }                break;            default:                break;        }    }    /**     * 设置view的监听器.     *     * @param field the field     * @param select the select     * @param noSelect the no select     * @throws Exception the exception     */    private void setViewSelectListener(Field field,String select,String noSelect)throws Exception{        Object obj = field.get(this);        if(obj instanceof View){            ((AbsListView)obj).setOnItemSelectedListener(new IocEventListener(this).select(select).noSelect(noSelect));        }    }}

将下面三个类copy到你的项目中即可

IocEventListener

import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnLongClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.AdapterView.OnItemLongClickListener;import android.widget.AdapterView.OnItemSelectedListener;import java.lang.reflect.Method;public class IocEventListener implements OnClickListener, OnLongClickListener, OnItemClickListener, OnItemSelectedListener,OnItemLongClickListener {    /** The handler. */    private Object handler;    /** The click method. */    private String clickMethod;    /** The long click method. */    private String longClickMethod;    /** The item click method. */    private String itemClickMethod;    /** The item select method. */    private String itemSelectMethod;    /** The nothing selected method. */    private String nothingSelectedMethod;    /** The item long click mehtod. */    private String itemLongClickMehtod;    /**     * Instantiates a new ab ioc event listener.     *     * @param handler the handler     */    public IocEventListener(Object handler) {        this.handler = handler;    }    /**     * Click.     *     * @param method the method     * @return the ab ioc event listener     */    public IocEventListener click(String method){        this.clickMethod = method;        return this;    }    /**     * Long click.     *     * @param method the method     * @return the ioc event listener     */    public IocEventListener longClick(String method){        this.longClickMethod = method;        return this;    }    /**     * Item long click.     *     * @param method the method     * @return the ioc event listener     */    public IocEventListener itemLongClick(String method){        this.itemLongClickMehtod = method;        return this;    }    /**     * Item click.     *     * @param method the method     * @return the ioc event listener     */    public IocEventListener itemClick(String method){        this.itemClickMethod = method;        return this;    }    /**     * Select.     *     * @param method the method     * @return the ioc event listener     */    public IocEventListener select(String method){        this.itemSelectMethod = method;        return this;    }    /**     * No select.     *     * @param method the method     * @return the ioc event listener     */    public IocEventListener noSelect(String method){        this.nothingSelectedMethod = method;        return this;    }    public boolean onLongClick(View v) {        return invokeLongClickMethod(handler,longClickMethod,v);    }    public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {        return invokeItemLongClickMethod(handler,itemLongClickMehtod,arg0,arg1,arg2,arg3);    }    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3) {        invokeItemSelectMethod(handler,itemSelectMethod,arg0,arg1,arg2,arg3);    }    public void onNothingSelected(AdapterView<?> arg0) {        invokeNoSelectMethod(handler,nothingSelectedMethod,arg0);    }    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {        invokeItemClickMethod(handler,itemClickMethod,arg0,arg1,arg2,arg3);    }    public void onClick(View v) {        invokeClickMethod(handler, clickMethod, v);    }    /**     * Invoke click method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return the object     */    private Object invokeClickMethod(Object handler, String methodName,  Object... params){        if(handler == null) return null;        Method method = null;        try{               method = handler.getClass().getDeclaredMethod(methodName,View.class);            if(method!=null)                return method.invoke(handler, params);              else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return null;    }    /**     * Invoke long click method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return true, if successful     */    private boolean invokeLongClickMethod(Object handler, String methodName,  Object... params){        if(handler == null) return false;        Method method = null;        try{               //public boolean onLongClick(View v)            method = handler.getClass().getDeclaredMethod(methodName,View.class);            if(method!=null){                Object obj = method.invoke(handler, params);                return obj==null?false:Boolean.valueOf(obj.toString());             }            else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return false;    }    /**     * Invoke item click method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return the object     */    private Object invokeItemClickMethod(Object handler, String methodName,  Object... params){        if(handler == null) return null;        Method method = null;        try{               ///onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3)            method = handler.getClass().getDeclaredMethod(methodName,AdapterView.class,View.class,int.class,long.class);            if(method!=null)                return method.invoke(handler, params);              else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return null;    }    /**     * Invoke item long click method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return true, if successful     */    private boolean invokeItemLongClickMethod(Object handler, String methodName,  Object... params){        Method method = null;        try{               if(handler == null){                throw new Exception("invokeItemLongClickMethod: handler is null :");            }            ///onItemLongClick(AdapterView<?> arg0, View arg1, int arg2,long arg3)            method = handler.getClass().getDeclaredMethod(methodName,AdapterView.class,View.class,int.class,long.class);            if(method!=null){                Object obj = method.invoke(handler, params);                return Boolean.valueOf(obj==null?false:Boolean.valueOf(obj.toString()));                }            else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return false;    }    /**     * Invoke item select method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return the object     */    private Object invokeItemSelectMethod(Object handler, String methodName,  Object... params){        if(handler == null) return null;        Method method = null;        try{               ///onItemSelected(AdapterView<?> arg0, View arg1, int arg2,long arg3)            method = handler.getClass().getDeclaredMethod(methodName,AdapterView.class,View.class,int.class,long.class);            if(method!=null)                return method.invoke(handler, params);              else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return null;    }    /**     * Invoke no select method.     *     * @param handler the handler     * @param methodName the method name     * @param params the params     * @return the object     */    private Object invokeNoSelectMethod(Object handler, String methodName,  Object... params){        if(handler == null) return null;        Method method = null;        try{               //onNothingSelected(AdapterView<?> arg0)            method = handler.getClass().getDeclaredMethod(methodName,AdapterView.class);            if(method!=null)                return method.invoke(handler, params);              else                throw new Exception("no such method:"+methodName);        }catch(Exception e){            e.printStackTrace();        }        return null;    }}

IocSelect

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * The Interface IocSelect. */@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME) public @interface IocSelect {    /**     * Selected.     *     * @return the string     */    public String selected();    /**     * No selected.     *     * @return the string     */    public String noSelected() default "";}

IocView

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * The Interface IocView. *//*    @Retention用来声明注解的保留策略，    有CLASS、RUNTIME和SOURCE这三种，    分别表示注解保存在类文件、JVM运行时刻和源代码中只有当声明为RUNTIME的时候，    才能够在运行时刻通过反射API来获取到注解的信息。    @Target用来声明注解可以被添加在哪些类型的元素上，如类型、方法和域等 */@Target(ElementType.FIELD)@Retention(RetentionPolicy.RUNTIME) public @interface IocView {    /**     * Id.     *     * @return the int     */    public int id();    /**     * Click.     *     * @return the string     */    public String click() default "";    /**     * Long click.     *     * @return the string     */    public String longClick() default "";    /**     * Item click.     *     * @return the string     */    public String itemClick() default "";    /**     * Item long click.     *     * @return the string     */    public String itemLongClick() default "";    /**     * Select.     *     * @return the ab ioc select     */    public IocSelect select() default @IocSelect(selected="") ;}