我正在构建的应用程序有一个记录功能。我通过在服务中启动一个MediaRecorder对象来实现这个功能：
Intent intent = new Intent(v.getContext(), RecordService.class);
Messenger messenger = new Messenger(handler);
intent.putExtra("COUNT", basic);
intent.putExtra("MESSENGER", messenger);
v.getContext().startService(intent);
//service
//...
mRecorder = new MediaRecorder();
//...
现在我添加了一个通知，用于让用户了解录制本身的状态，因为如果你回到主页或点击返回按钮，它必须继续录制。因此，如果你点击通知，你会回到应用程序。
这就是我遇到困难的地方，如果我点击通知，我回到应用程序，但所有内容都被设置为初始状态（计时器回到00:00:00，我可以再次点击录制按钮而不是暂停按钮）。我应该实现的当然是保持录制并且我可以看到正在进行的计时器+停止按钮。注意：计时器现在不是一个服务。有什么想法吗？我应该如何处理这个问题？
编辑
假设我关闭了应用程序，服务仍在运行。重新打开应用程序（因此是最初调用服务的活动）我们可以使用：
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) myContext.getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (MyService.class.getName().equals(service.service.getClassName())) {
return true;
}
}
return false;
}
我在某种程度上已经解决了这个问题，但是从该服务传递到该活动的变量现在已经丢失。看起来我的活动中的处理程序在重新打开该活动后没有接收到它们？
private Handler handler = new Handler() {
public void handleMessage(Message message) {
//..
Bundle bundle = message.getData();
fileName = bundle.getString("FILENAME");
tvFileName.setText(fileName);
Log.e("Filename", "transfered: " + fileName);
};
};
//编辑
片段：
public class LayoutOne extends Fragment implements OnClickListener {
//vars
@Override
public void onPause() {
super.onPause();
if (mRecorder != null) {
mRecorder.release();
mRecorder = null;
}
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
}
private Handler handler = new Handler() {
public void handleMessage(Message message) {
int i = message.arg1;
Bundle bundle = message.getData();
fileName = bundle.getString("FILENAME");
tvFileName.setText(fileName);
Log.e("Handler", "Succesfully transfered: " + (Integer.toString(i)));
Log.e("Filename", "Succesfully transfered: " + fileName);
};
};
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bRecord:
if (mStartRecording) {
mStartRecording = false;
Intent intent = new Intent(v.getContext(), RecordService.class);
Messenger messenger = new Messenger(handler);
intent.putExtra("MESSENGER", messenger);
v.getContext().startService(intent);
} else {
mRecordButton.setText("Record");
Intent stopIntent = new Intent(v.getContext(),
RecordService.class);
try {
v.getContext().stopService(stopIntent);
} catch (Exception e) {
e.printStackTrace();
}
mStartRecording = true;
}
break;
case R.id.bStop:
Intent stopIntent = new Intent(v.getContext(), RecordService.class);
v.getContext().stopService(stopIntent);
break;
}
}
public static Fragment newInstance(Context context) {
LayoutOne f = new LayoutOne();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
root = (ViewGroup) inflater.inflate(R.layout.layout_one, null);
myContext = container.getContext();
//buttons
mgr = (NotificationManager) myContext.getSystemService(Context.NOTIFICATION_SERVICE);
return root;
}
public void notifyMe(View v) {
Notification note = new Notification(R.drawable.ic_launcher,
getString(R.string.notificationbar), System.currentTimeMillis());
PendingIntent i = PendingIntent.getActivity(myContext, 0, new Intent(
myContext, ViewPagerStyle1Activity.class), 0);
note.setLatestEventInfo(myContext, getString(R.string.app_name),
getString(R.string.notification), i);
note.number = ++count;
note.vibrate = new long[] { 500L, 200L, 200L, 500L };
note.flags |= Notification.FLAG_AUTO_CANCEL;
mgr.notify(NOTIFY_ME_ID, note);
}
public void clearNotification(View v) {
mgr.cancel(NOTIFY_ME_ID);
}
// /SHARED PREFERENCES SETTINGS///
//…
private void initiatePopupWindow() {
//..
}
@Override
public void onResume() {
super.onResume();
Intent intent = new Intent(myContext, RecordService.class);
myContext.startService(intent);
myContext.bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
}
private ServiceConnection mServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
LocalBinder binder = (LocalBinder) service;
myService = binder.getService();
//myService.setBound(true);
initializeUI();
}
@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
}
};
protected void initializeUI() {
//..
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
myContext.unbindService(mServiceConnection);
}
@Override
public void onStop() {
// TODO Auto-generated method stub
myContext.unbindService(mServiceConnection);
}
}
//SERVICE
public class RecordService extends Service {
//vars
public class LocalBinder extends Binder {
RecordService getService() {
return RecordService.this;
}
}
@Override
public void onCreate() {
Log.i("Oncreate", "Service onCreate");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Bundle extras = intent.getExtras();
if (extras != null) {
messenger = (Messenger) extras.get("MESSENGER");
count = Integer.toString(extras.getInt("COUNT"));
try {
Message message = new Message();
int arg = 0;
message.arg1 = arg;
mFileNamePass=”test”;
Bundle bundle = new Bundle();
bundle.putString("FILENAME", mFileNamePass);
message.setData(bundle);
messenger.send(message);
} catch (android.os.RemoteException e1) {
Log.w(getClass().getName(), "Exception sending message", e1);
}
}
else {
Log.i("Extras","Didn't find extras");
}
Runnable r = new Runnable() {
@Override
public void run() {
checkIfFolderExists();
String dateFull = calculateDate();
mFileName = Environment.getExternalStorageDirectory()
.getAbsolutePath();
mFileName += "test.3gp";
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile(mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
mRecorder.start();
Log.i("Service", "Service running");
}
};
Thread t = new Thread(r);
t.start();
return RecordService.START_STICKY;
}
@Override
public void onDestroy() {
Runnable stopRecord = new Runnable() {
@Override
public void run() {
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
};
Thread stopRecordThread = new Thread(stopRecord);
stopRecordThread.start();
Log.i("Service", "Service stopped");
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}