Android实现Activity、Service与Broadcaster三大组件之间互相调用的方法详解

package com.ljq.activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Context;import android.content.Intent;import android.graphics.Color;import android.os.Binder;import android.os.IBinder;public class MyService extends Service { private NotificationManager notificationManager = null; private final IBinder binder = new LocalBinder(); @Override public void onCreate() { sendMsgtoActivty("Service is oncreating./n"); } @Override public IBinder onBind(Intent intent) { String msg = "Activity is sendding message to service,/n Service send msg to server!/n"; sendMsgtoActivty(msg); return binder; } /** * 把信息传递给activity * * @param msg */ private void sendMsgtoActivty(String msg) { Intent intent = new Intent("com.android.Yao.msg"); intent.putExtra("msg", msg); this.sendBroadcast(intent); } @Override public void onDestroy() { super.onDestroy(); if(notificationManager!=null){  notificationManager.cancel(0);  notificationManager=null; } } /** * 在状态栏显示通知 * * @param msg */ private void showNotification(String msg) { notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); // 定义Notification的各种属性 Notification notification =new Notification(R.drawable.icon,     "A Message Coming!", System.currentTimeMillis()); //FLAG_AUTO_CANCEL  该通知能被状态栏的清除按钮给清除掉 //FLAG_NO_CLEAR   该通知不能被状态栏的清除按钮给清除掉 //FLAG_ONGOING_EVENT 通知放置在正在运行 //FLAG_INSISTENT   是否一直进行，比如音乐一直播放，知道用户响应 notification.flags |= Notification.FLAG_ONGOING_EVENT; // 将此通知放到通知栏的"Ongoing"即"正在运行"组中 notification.flags |= Notification.FLAG_NO_CLEAR; // 表明在点击了通知栏中的"清除通知"后，此通知不清除，经常与FLAG_ONGOING_EVENT一起使用 notification.flags |= Notification.FLAG_SHOW_LIGHTS; //DEFAULT_ALL   使用所有默认值，比如声音，震动，闪屏等等 //DEFAULT_LIGHTS 使用默认闪光提示 //DEFAULT_SOUNDS 使用默认提示声音 //DEFAULT_VIBRATE 使用默认手机震动，需加上<uses-permission android:name="android.permission.VIBRATE" />权限 notification.defaults = Notification.DEFAULT_LIGHTS; //叠加效果常量 //notification.defaults=Notification.DEFAULT_LIGHTS|Notification.DEFAULT_SOUND; notification.ledARGB = Color.BLUE; notification.ledOnMS =5000; //闪光时间，毫秒 // 设置通知的事件消息 //Intent notificationIntent =new Intent(MainActivity.this, MainActivity.class); // 点击该通知后要跳转的Activity Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class); // 加载类，如果直接通过类名，会在点击时重新加载页面，无法恢复最后页面状态。 notificationIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); PendingIntent contentItent = PendingIntent.getActivity(this, 0, notificationIntent, 0); notification.setLatestEventInfo(this, "Message", "Message:" + msg, contentItent); // 把Notification传递给NotificationManager notificationManager.notify(0, notification); } /** * 从activity获取信息 * * @param msg */ public void receiverMsgtoActivity(String msg){ sendMsgtoActivty("/n receiverMsgtoActivity:"+msg); } public void sendMsgtoServer(String msg) { showNotification(msg); } public class LocalBinder extends Binder { public MyService getService() {  return MyService.this; } }}

package com.ljq.activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;/** * 发送Intent启动服务 * * @author jiqinlin * */public class MyBroadcastreceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Intent service = new Intent(context, MyService.class); context.startService(service); }}

package com.ljq.activity;import java.util.List;import android.app.Activity;import android.app.ActivityManager;import android.content.BroadcastReceiver;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.util.Log;import android.view.View;import android.widget.TextView;public class MainActivity extends Activity implements View.OnClickListener { private String msg = ""; private TextView txtMsg; private UpdateReceiver receiver; private MyService myService; private final static String TAG=MainActivity.class.getSimpleName(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); txtMsg = (TextView) this.findViewById(R.id.txtMsg); this.findViewById(R.id.btnStart).setOnClickListener(this); this.findViewById(R.id.btnSend).setOnClickListener(this); //订阅广播Intent receiver = new UpdateReceiver(); IntentFilter filter = new IntentFilter(); filter.addAction("com.android.Yao.msg"); this.registerReceiver(receiver, filter); //初始化时启动服务 //Intent intent = new Intent(MainActivity.this, MyService.class); //this.bindService(intent, conn, BIND_AUTO_CREATE); } @Override protected void onDestroy() { super.onDestroy(); //结束服务 if(conn!=null){  unbindService(conn);  myService=null; } } public class UpdateReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) {  //获取service传过来的信息  msg = intent.getStringExtra("msg");  txtMsg.append(msg); } } private ServiceConnection conn = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) {  myService = ((MyService.LocalBinder) service).getService();  Log.i(TAG, "onServiceConnected myService: "+myService); } @Override public void onServiceDisconnected(ComponentName name) {  myService = null; } }; @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, MyService.class); switch (v.getId()) { case R.id.btnStart:  //判断服务是否启动  if(false==isServiceRunning(this, MyService.class.getName())){  Log.i(TAG, "start "+MyService.class.getSimpleName()+" service");  this.bindService(intent, conn, BIND_AUTO_CREATE);  }  Log.i(TAG, MyService.class.getName()+" run status: "+isServiceRunning(this, MyService.class.getName()));  break; case R.id.btnSend:  //判断服务是否启动  if(false==isServiceRunning(this, MyService.class.getName())){  Log.i(TAG, "start "+MyService.class.getSimpleName()+" service");  this.bindService(intent, conn, BIND_AUTO_CREATE);  }  Log.i(TAG, MyService.class.getName()+" run status: "+isServiceRunning(this, MyService.class.getName()));  Log.i(TAG, "onClick myService: "+myService); //第一次启动服务时此处为null(小编认为虽然服务已启动成功，但是还没全部初始化)  if(myService!=null){    myService.sendMsgtoServer("i am sending msg to server");    //从activity传递信息给service    myService.receiverMsgtoActivity("this is a msg");   }  break; } } /** * 判断服务是否正在运行 * * @param context * @param className 判断的服务名字：包名+类名 * @return true在运行 false 不在运行 */ public static boolean isServiceRunning(Context context, String className) { boolean isRunning = false; ActivityManager activityManager = (ActivityManager) context  .getSystemService(Context.ACTIVITY_SERVICE); //获取所有的服务 List<ActivityManager.RunningServiceInfo> services= activityManager.getRunningServices(Integer.MAX_VALUE); if(services!=null&&services.size()>0){  for(ActivityManager.RunningServiceInfo service : services){  if(className.equals(service.service.getClassName())){   isRunning=true;   break;  }  } } return isRunning; }}

<?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:id="@+id/txtMsg" /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="start service"  android:id="@+id/btnStart"/> <Button android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="send msg to server"  android:id="@+id/btnSend"/> </LinearLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.ljq.activity"   android:versionCode="1"   android:versionName="1.0">  <application android:icon="@drawable/icon" android:label="@string/app_name">    <activity android:name=".MainActivity"         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"/>    <receiver android:name=".MyBroadcastreceiver" />  </application>  <uses-sdk android:minSdkVersion="7" /></manifest>