Activity、Service、BroadcastReceiver的通信

目的

本应用程序包括一个活动(testActivity)和一个服务(testService), 他们各自有自己的广播接收器(MyReceiver 和TestServiceReceiver). 

当按下Start按钮, testActivity会通过意图(Intent)启动testService. 
在testService的onStartCommand()创建并启动一个线程(thread),在线程里面重复发送广播(sendBroadcast()),把当前系统时间送给testActivity的MyReceiver. 
当MyReceiver接收到,会把接收到的时间和新的系统时间比较,并把延迟时间显示出来.

当按下Stop按钮, testActivity会发送广播送给testService的TestServiceReceiver.  
当TestServiceReceiver接收到,便会停止服务.

testActivity.java

package com.testActivity;
 
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.widget.Button;
import android.widget.TextView;
 
public class testActivity extends Activity {
 
 final static String MY_ACTION = "testActivity.MY_ACTION" ;
 
 TextView textData;
 
 public static final int RQS_STOP_SERVICE = 1 ;
 MyReceiver myReceiver;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        textData = (TextView)findViewById(R.id.data);
        Button buttonStart = (Button)findViewById(R.id.start);
        Button buttonStop = (Button)findViewById(R.id.stop);
        buttonStart.setOnClickListener(buttonStartOnClickListener);
        buttonStop.setOnClickListener(buttonStopOnClickListener);
    }
 
    @Override
 protected void onStart() {
  // TODO Auto-generated method stub
     myReceiver = new MyReceiver();
     IntentFilter intentFilter = new IntentFilter();
     intentFilter.addAction(MY_ACTION);
     registerReceiver(myReceiver, intentFilter);   //←Squek:注册receiver等待其他Broadcast传送
  super .onStart();
 }
 
 @Override
 protected void onStop() {
  // TODO Auto-generated method stub
  unregisterReceiver(myReceiver);  //←Squek:取消注册
  super .onStop();
 }
 
 Button.OnClickListener buttonStartOnClickListener
    = new Button.OnClickListener(){
 
  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   Intent intent = new Intent(testActivity. this , com.testActivity.testService. class );
   testActivity. this .startService(intent);   //←Squek:Service启动
  }};
 
 Button.OnClickListener buttonStopOnClickListener
 = new Button.OnClickListener(){
 
  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   Intent intent = new Intent();
   intent.setAction(testService.MY_ACTION);
   intent.putExtra( "RQS" , RQS_STOP_SERVICE);
   sendBroadcast(intent);  //←Squek:Activity send Broadcast
  }};
 
  //Broadcast Receiver宣告
  private class MyReceiver extends BroadcastReceiver{
 
  @Override
  public void onReceive(Context arg0, Intent arg1) {
   // TODO Auto-generated method stub
   long timestamp = arg1.getLongExtra( "timestamp" , 0 );
   long curtime = System.currentTimeMillis();
   long delay = curtime - timestamp;
   textData.setText(String.valueOf(timestamp)
     + " : " + String.valueOf(curtime)
     + " delay " + String.valueOf(delay)
     + "(ms)" );
  }
 
 }
}

testService.java

package com.testActivity;
 
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.widget.Toast;
 
public class testService extends Service {
 
 final static String MY_ACTION = "testService.MY_ACTION" ;
 
 TestServiceReceiver testServiceReceiver;
 boolean running;
 
 @Override
 public void onCreate() {
  // TODO Auto-generated method stub
  Toast.makeText(getBaseContext(),
    "TestServiceReceiver.onCreate" ,
    Toast.LENGTH_LONG).show();
  testServiceReceiver = new TestServiceReceiver();
  super .onCreate();
 }
 
 @Override
 public IBinder onBind(Intent arg0) {
  // TODO Auto-generated method stub
  return null ;
 }
 
 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
  // TODO Auto-generated method stub
  Toast.makeText(getBaseContext(),
    "TestServiceReceiver.onStartCommand" ,
    Toast.LENGTH_LONG).show();
  IntentFilter intentFilter = new IntentFilter();
  intentFilter.addAction(MY_ACTION);
  registerReceiver(testServiceReceiver, intentFilter);
  running = true ;
 
  MyThread myThread = new MyThread();
  myThread.start();
 
  return super .onStartCommand(intent, flags, startId);
 }
 
 
 
 @Override
 public void onDestroy() {
  // TODO Auto-generated method stub
  this .unregisterReceiver(testServiceReceiver);
  super .onDestroy();
 }
 
 public class MyThread extends Thread {
 
  @Override
  public void run() {
   // TODO Auto-generated method stub
 
   // TODO Auto-generated method stub
   while (running){
    try {
     Thread.sleep( 1000 );
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    Intent intent = new Intent();
    intent.setAction(testActivity.MY_ACTION);
    intent.putExtra( "timestamp" , System.currentTimeMillis());
    sendBroadcast(intent);  //←Squek:Service send Broadcast
   }
  }
 
 }
 
 public class TestServiceReceiver extends BroadcastReceiver {
 
  @Override
  public void onReceive(Context arg0, Intent arg1) {
   // TODO Auto-generated method stub
   int rqs = arg1.getIntExtra( "RQS" , 0 );
   if (rqs == testActivity.RQS_STOP_SERVICE){
    Toast.makeText(getBaseContext(),
      "TestServiceReceiver.onReceive w/ RQS_STOP_SERVICE" ,
      Toast.LENGTH_LONG).show();
    running = false ;
    stopSelf();
   }
  }
 }
 
}

main.xml

<? 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"
    >
< TextView
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    android:text = "@string/hello"
    />
< Button
 android:id = "@+id/start"
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    android:text = "- Start -"
    />
< Button
 android:id = "@+id/stop"
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    android:text = "- Stop -"
    />
< TextView
 android:id = "@+id/data"
    android:layout_width = "fill_parent"
    android:layout_height = "wrap_content"
    />
</ LinearLayout >

AndroidManifest.xml setting

<? xml version = "1.0" encoding = "utf-8" ?>
< manifest xmlns:android = " http://schemas.android.com/apk/res/android"
      package = "com.testActivity"
      android:versionCode = "1"
      android:versionName = "1.0" >
    < application android:icon = "@drawable/icon" android:label = "@string/app_name" >
        < activity android:name = ".testActivity"
                  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 = ".testService"
     />
    </ application >
    < uses-sdk android:minSdkVersion = "7" />
 
</ manifest >
posted @ 2013-04-27 13:26 重庆Debug 阅读(...) 评论(...) 编辑 收藏