本文主要是介绍android service 通过broadcast通知Myreceiver 启动activity，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
<span style="white-space: pre; "> </span>本程序实现的是在android 中后台启动service 监听某个函数的返回状态，如果发生改变则通过broadcast到MyReceiver然后 启动另一个类似接听电话的activity，现附上源码并加以描述。1 MainAcitvity.java 中实现的是handleMessage(接收MyReceiver发送过来的hander对象)；button2中的绑定服务（只有在按Button2后才可以绑定服务）；重写OnserviceDisconnected和OnserviceConnected方法
public class MainActivity extends Activity {private Button button1;private Button button2;private Binder binder;public static final int STARTACTIVITY = 1;public static Handler handlerstart = new Handler(){public void handleMessage(Message msg){if(msg.what == STARTACTIVITY){M_arg.count++;String s=String.valueOf(M_arg.count);Log.e("msg2",s);Context context = (Context)msg.obj;Intent intent = new Intent(context,ListenCall.class);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);//播放音乐}super.handleMessage(msg); }};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button2 = (Button)findViewById(R.id.button2);//完成绑定对象 开始绑定Intent intent = new Intent();intent.setClass(MainActivity.this, SecondService.class);//绑定服务由该函数来完成，由第二个函数可知道第二部要做什么bindService(intent, conn, BIND_AUTO_CREATE);//发送请求button2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Parcel data = Parcel.obtain();Parcel reply = Parcel.obtain();data.writeString("from activity :data");//给parcel方数据try {//一执行transact 就会去执行secondservice的ontransact，并且将相应的四个参数传递到ontransact中binder.transact(0, data, reply,0);String s = reply.readString();//Log.e("msg接收", s); } catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});}//连接对象，重写OnserviceDisconnected和OnserviceConnected方法 ServiceConnection conn = new ServiceConnection() {// 成功连接服务，该方法被执行。在该方法中可以通过IBinder对象取得onBind方法的返回值，一般通过向下转型@Overridepublic void onServiceConnected(ComponentName name, IBinder binder) {MainActivity.this.binder = (Binder)binder;//绑定成功之后，MyBinder()传过来的binder对象赋值给mainacitvity的binder}@Overridepublic void onServiceDisconnected(ComponentName componentName) {// TODO Auto-generated method stub}};
}public class SecondService extends Service {IBinder binder = new MyBinder();private static final String TAG = "MyService";byte[] datahtml;String htmlcode;byte[] datahtmlafter;String htmlcodeafter;String alarm;String alarmafter;String textenter;String textenterafter;private boolean checkalarm = false;// 当service与activity成功调用时调用这个方法@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn binder;}class MyBinder extends Binder {//定义一个action常量private static final String MY_ACTION = "com.example.parceltest.MY_ACTION";// data是activity 发往service的。reply是service发往activity@Overrideprotected boolean onTransact(int code, Parcel data, Parcel reply,int flags) throws RemoteException {// TODO Auto-generated method stubfinal Handler whilehandler = new Handler();Runnable runnable = new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stub checkalarm = checkalarm();whilehandler.postDelayed(this, 2000);//每隔2s钟if (checkalarm) {// 获得了这个alarm然后再每隔2s钟再检测一次是不是还是同样的alarm如果不是或者是就返回给activityIntent intent = new Intent();//设置avtion属性intent.setAction(MY_ACTION);intent.putExtra("msg", "开门");if(M_arg.count==0){sendBroadcast(intent);//发出广播M_arg.count++;}else{Handler delayhandler = new Handler();delayhandler.postDelayed(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubM_arg.count=0;}}, 33000); }}//Log.e("data", s);//程序在这个地方崩掉}};String s = data.readString();reply.writeString("from service: reply");whilehandler.postDelayed(runnable, 2000);// 打开定时器，执行操作 实现每隔2s钟重复执行checkalarm()一次return super.onTransact(code, data, reply, flags);}}public boolean checkalarm() {try {datahtml=getHtml();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} try {htmlcode = new String(datahtml,"gb2312");} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.printStackTrace();}textenter = htmlcode.replaceAll("\n", "");//去掉回车符alarm = textenter.substring(123, 137);//取出123到137位if(alarm.equals("alarm_status=2")){//正常情况下alarm是alarm_status=0，checkalarm = true;Log.e("msg1", "第一次执行true");}else {checkalarm = false;Log.e("msg1", "第一次执行false");}return checkalarm;}public byte[] getHtml() throws Exception {URL url = new URL("http://192.168.1.104:81/get_status.cgi");//我是在局域网里面试的可以访问改地址。HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5 * 1000);InputStream inStream = conn.getInputStream();ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = inStream.read(buffer)) != -1) {outStream.write(buffer, 0, len);}byte[] data = outStream.toByteArray();// 网页的二进制数据outStream.close();inStream.close();return data;}// service 创建时被调用@Overridepublic void onCreate() {Log.e(TAG, "start onCreate~~~");super.onCreate();}// 客户端调用startservice()方法启动service时，该方法被调用@Overridepublic void onStart(Intent intent, int startId) {Log.e(TAG, "start onStart~~~");super.onStart(intent, startId);}// 当service不再使用是被调用@Overridepublic void onDestroy() {Log.e(TAG, "start onDestroy~~~");super.onDestroy();}
}public class MyReceiver extends BroadcastReceiver{@Overridepublic void onReceive(final Context context, Intent intent) {//从intent中获得信息String msg = intent.getStringExtra("msg");//使用toast显示if(msg.equals("开门")){Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();//在一个普通类中启动activity http://bbs.csdn.net/topics/370005057//在receive里面启动一个activity会存在的问题是 onReceive函数只会存在10s钟左右就会销毁//解决方法是：广播里面向handler发送一个消息，在handler里面去打开一个界面。/*Intent intentcall = new Intent(context, ListenCall.class);intentcall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intentcall); */Message message = new Message(); message.what = 1;message.obj = context;MainActivity.handlerstart.sendMessage(message);}} }
public class ListenCall extends Activity
{private ImageButton accept;private ImageButton reject;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.linsten);accept = (ImageButton)findViewById(R.id.btn_doorbell_ok);reject = (ImageButton)findViewById(R.id.btn_doorbell_no);accept.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){}});reject.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub}});}}
public class M_arg{public static int count=0;
}
2 Layout部分代码请直接下载下面的连接。去下载整个工程。
源代码及工程下载地址：点击打开链接
这篇关于android service 通过broadcast通知Myreceiver 启动activity的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
