Activity和Service之间通讯的Demo

1.Activity的类别文件:

package wyf.wpf;//声明包语句

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.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
//继承自Activity的子类

public class Sample_3_6 extends Activity {
	public static final int CMD_STOP_SERVICE = 0;
	Button btnStart;// 开始服务Button对象应用
	Button btnStop;// 停止服务Button对象应用
	TextView tv;// TextView对象应用
	DataReceiver dataReceiver;// BroadcastReceiver对象

	@Override
	public void onCreate(Bundle savedInstanceState) {// 重写onCreate方法
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);// 设置显示的屏幕
		btnStart = (Button) findViewById(R.id.btnStart);
		btnStop = (Button) findViewById(R.id.btnStop);
		tv = (TextView) findViewById(R.id.tv);
		
		btnStart.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent myIntent = new Intent(Sample_3_6.this,
						wyf.wpf.MyService.class);
				startService(myIntent);// 发送Intent启动Service
			}
		});
		
		btnStop.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent myIntent = new Intent();
				myIntent.setAction("wyf.wpf.MyService");
				myIntent.putExtra("cmd", CMD_STOP_SERVICE);
				sendBroadcast(myIntent);// 发送广播
			}
		});
	}

	private class DataReceiver extends BroadcastReceiver {// 继承自BroadcastReceiver的子类
		@Override
		public void onReceive(Context context, Intent intent) {// 重写onReceive方法
			double data = intent.getDoubleExtra("data", 0);
			tv.setText("Service的数据为:" + data);
		}
	}

	@Override
	protected void onStart() {// 重写onStart方法
		dataReceiver = new DataReceiver();
		IntentFilter filter = new IntentFilter();// 创建IntentFilter对象
		filter.addAction("wyf.wpf.Sample_3_6");
		registerReceiver(dataReceiver, filter);// 注册Broadcast Receiver
		super.onStart();
	}

	@Override
	protected void onStop() {// 重写onStop方法
		unregisterReceiver(dataReceiver);// 取消注册Broadcast Receiver
		super.onStop();
	}
}

2.服务的类:

package wyf.wpf;//声明包语句

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
//继承自Service的子类

public class MyService extends Service {
	CommandReceiver cmdReceiver;
	boolean flag;

	@Override
	public void onCreate() {// 重写onCreate方法
		flag = true;
		cmdReceiver = new CommandReceiver();
		super.onCreate();
	}

	@Override
	public IBinder onBind(Intent intent) {// 重写onBind方法
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {// 重写onStartCommand方法
		IntentFilter filter = new IntentFilter();// 创建IntentFilter对象
		filter.addAction("wyf.wpf.MyService");
		registerReceiver(cmdReceiver, filter);// 注册Broadcast Receiver,后续会接收相关广播intent
		doJob();// 调用方法启动线程
		return super.onStartCommand(intent, flags, startId);
	}

	// 方法：
	public void doJob() {
		new Thread() {
			public void run() {
				while (flag) {
					try {// 睡眠一段时间
						Thread.sleep(1000);
					} catch (Exception e) {
						e.printStackTrace();
					}
					Intent intent = new Intent();// 创建Intent对象
					intent.setAction("wyf.wpf.Sample_3_6");
					intent.putExtra("data", Math.random());
					sendBroadcast(intent);// 发送广播
				}
			}

		}.start();
	}

	private class CommandReceiver extends BroadcastReceiver {// 继承自BroadcastReceiver的子类
		@Override
		public void onReceive(Context context, Intent intent) {// 重写onReceive方法
			int cmd = intent.getIntExtra("cmd", -1);// 获取Extra信息
			if (cmd == Sample_3_6.CMD_STOP_SERVICE) {// 如果发来的消息是停止服务
				flag = false;// 停止线程
				stopSelf();// 停止服务
			}
		}
	}

	@Override
	public void onDestroy() {// 重写onDestroy方法
		this.unregisterReceiver(cmdReceiver);// 取消注册的CommandReceiver
		super.onDestroy();
	}
}

最后是配置文件和main.xml,每个Service都需要在配置文件里申明标签:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="wyf.wpf" android:versionCode="1" android:versionName="1.0">
	<application android:icon="@drawable/icon" android:label="@string/app_name">
		<activity android:name=".Sample_3_6" android:label="@string/app_name">
			<intent-filter>
				<action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
			</intent-filter>
		</activity>
		<service android:name=".MyService" android:process=":remote">
			<intent-filter>
				<action android:name="wyf.wpf.MyService" />
			</intent-filter>
		</service>
	</application>
	<uses-sdk android:minSdkVersion="7" />

</manifest> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<Button android:id="@+id/btnStart" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="启动服务" />
	<Button android:id="@+id/btnStop" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="停止服务" />
	<TextView android:id="@+id/tv" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="等待来自Service的数据" />
</LinearLayout>