Android开发之Service与Activity数据交互（源代码分享）

   Service想要与Activity进行数据交互&＃xff0c;首先Activity先得绑定Service.bound service是service 的实现,它允许其他应用程序绑定到它并与之交互。要提供bound service,我们必须实现onBind()回调方法。这个方法返回一个内部对象定义的编程接口,Activity可以使用与Service进行交互。那么具体该如何实现呢&＃xff0c;首先我们还是一样先创建一个MyService继承Service。然后如何设置:呢。&＃xff08;1&＃xff09;在你的Service,创建一个Binder实例,返回当前的Service实例以及一个Activity可以调用公共方法。&＃xff08;2&＃xff09;返回这个实例的Binder在onBind()回调方法。&＃xff08;3&＃xff09;在Activity里创建ServiceConnection,在onServiceConnected()回调方法接受Binder,并得到服务器的实例。讲的比较啰嗦哦&＃xff0c;我们还是看代码来细细品味吧。

  Service的代码

package com.example.f22_service02;import java.util.Random;import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.util.Log;public class HelloService extends Service {private MyBinder binder&＃61;new MyBinder();public class MyBinder extends Binder{public HelloService getService(){return HelloService.this; //返回Service实例&＃xff0c;使主程序能调用该方法}&＃64;Overrideprotected boolean onTransact(int code, Parcel data, Parcel reply,int flags) throws RemoteException {// TODO Auto-generated method stubLog.i("TAG", "------>"&＃43;data.readInt());Log.i("TAG", "------>"&＃43;data.readString());reply.writeInt(2);reply.writeString("Rose");return super.onTransact(code, data, reply, flags);}}&＃64;Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn binder; //回掉方法}public int getRandom(){return new Random().nextInt(100);}&＃64;Overridepublic void onCreate() {// TODO Auto-generated method stubLog.i("TAG", "------>Create");super.onCreate();}&＃64;Overridepublic boolean onUnbind(Intent intent) {// TODO Auto-generated method stubLog.i("TAG", "------>Unbind");return super.onUnbind(intent);}}


Activity的方法

package com.example.f22_service02;import com.example.f22_service02.HelloService.MyBinder;import android.os.Bundle;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;&＃64;SuppressLint("Recycle")
public class MainActivity extends Activity implements OnClickListener {private Button button, button2, button3;private MyBinder binder;private HelloService helloService;&＃64;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button &＃61; (Button) this.findViewById(R.id.button1);button2 &＃61; (Button) this.findViewById(R.id.button2);button3 &＃61; (Button) this.findViewById(R.id.button3);button.setOnClickListener(this);button2.setOnClickListener(this);button3.setOnClickListener(this);}private ServiceConnection connection &＃61; new ServiceConnection() {&＃64;Overridepublic void onServiceDisconnected(ComponentName name) {// TODO Auto-generated method stubLog.i("ACTIVITY", "---------〉失去绑定");}&＃64;Overridepublic void onServiceConnected(ComponentName name, IBinder service) {// TODO Auto-generated method stubbinder &＃61; (MyBinder) service; // 绑定Service&＃xff0c;并获得Service实例&＃xff0c;接下来就可以调用Service中的方法了helloService &＃61; binder.getService();Log.i("ACTIVITY", "---------〉绑定成功");}};&＃64;SuppressLint("Recycle")&＃64;Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.button1://绑定ServiceIntent intent&＃61;new Intent(MainActivity.this,HelloService.class);bindService(intent, connection, Context.BIND_AUTO_CREATE);//第三个参数是一个标志显示选项绑定break;case R.id.button2://实现Activity与Service的数据交互//Parcel是一个容器&＃xff0c;能包含消息(数据和对象引用),可以通过一个IBinde发送Parcel data&＃61;Parcel.obtain();data.writeInt(helloService.getRandom());data.writeString("jack");Parcel reply&＃61;Parcel.obtain();try {binder.transact(IBinder.LAST_CALL_TRANSACTION, data, reply, 0);} catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();}Log.i("ACTIVITY", "----Service回传的值---->"&＃43;reply.readInt());Log.i("ACTIVITY", "----Service回传的值---->"&＃43;reply.readString());break;case R.id.button3://解除绑定unbindService(connection);break;}}}