Android中Activity和Service简单交互（通过广播机制）

java代码：

ServiceActivity代码：

package com.cwb;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class ServiceActivity extends Activity{

private Button button;

MyBroadcast mybroadcast;

    @Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.service);

button = (Button)findViewById(R.id.service);

button.setOnClickListener(new Button.OnClickListener(){

@Override

public void onClick(View v) { 

Intent intent = new Intent(ServiceActivity.this,com.cwb.MyService.class);

intent.putExtra("number", 1); 

ServiceActivity.this.startService(intent);  //启动service

}

});

}

    

    @Override

protected void onStart() {

    mybroadcast = new MyBroadcast();

    IntentFilter filter = new IntentFilter();

    filter.addAction("com.cwb.ServiceActivity");

    registerReceiver(mybroadcast, filter);  //注册Broadcast Receiver

super.onStart();

}

@Override

protected void onStop() {

unregisterReceiver(mybroadcast);//取消注册

super.onStop();

}

public class MyBroadcast extends BroadcastReceiver {  

        @Override  

        public void onReceive(Context context, Intent intent) {  

                int count = intent.getIntExtra("count", 0);  

                System.out.println("*****"+count+"******");

                Toast.makeText(context, "当前数字为:"+count, Toast.LENGTH_LONG).show();  

                //显示service发来得数据

        }

    }  

   

}

MyService代码：

package com.cwb;

import android.app.Service;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.IBinder;

public class MyService extends Service{

myReceiver myreceiver;

@Override

public IBinder onBind(Intent intent) {

return null;

}

@Override

public void onCreate() {

myreceiver = new myReceiver();  //创建BroadcastReceiver子类对象

super.onCreate();

}

@Override

public void onStart(Intent intent, int startId) {

System.out.println("service启动成功！！！");

IntentFilter filter = new IntentFilter();

filter.addAction("com.cwb.MyService");

registerReceiver(myreceiver, filter);  

//注册Broadcast Receiver，若service不需要接受activity发来的广播也可以不写

int mynumber = intent.getIntExtra("number", 3);

   for(int i = 10; mynumber < i; mynumber ++){

    try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

    Intent serviceIntent = new Intent();

    serviceIntent.setAction("com.cwb.ServiceActivity");

    serviceIntent.putExtra("count", mynumber);

sendBroadcast(serviceIntent); 

//每隔2秒发送一个广播到ServiceActivity

   }

}

@Override

public void onDestroy() {

unregisterReceiver(myreceiver); //取消注册

super.onDestroy();

}

private class myReceiver extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

//这里接受处理activity传来的广播，如手动控制service停止等

}

}

}

另外Android Manifest中17、18行为新增

运行效果：

 

当点击了GO按钮之后，会弹出“当前数字为：1至9”

好了，就到这里，欢迎大家交流。