我正在尝试在Android应用程序的后台运行连续语音识别服务。我希望服务将处理后的文本发送回主线程以用于UI目的。
当我在我的线程的run函数中时，线程在绑定服务后立即死亡。你们中的任何人都可以指导我正确的方向发生这种情况吗？
以下是从here
借来的服务代码/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.example.quadcontrol;
//import android.annotation.SdkConstant;
//import android.annotation.SdkConstant.SdkConstantType;
import android.app.Service;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.speech.RecognitionListener;
import android.speech.RecognitionService;
import android.speech.SpeechRecognizer;
import android.util.Log;
public abstract class SimpleVoiceService extends Service
{
/**
* The {@link Intent} that must be declared as handled by the service.
*/
//@SdkConstant(SdkConstantType.SERVICE_ACTION)
public static final String SERVICE_INTERFACE = "android.speech.RecognitionService";
/**
* Name under which a RecognitionService component publishes information about itself.
* This meta-data should reference an XML resource containing a
* <code><{@link android.R.styleable#RecognitionService recognition-service}></code> tag.
*/
public static final String SERVICE_META_DATA = "android.speech";
/** Log messages identifier */
private static final String TAG = "SimpleVoiceService";
/** Debugging flag */
private static final boolean DBG = false;
/** Binder of the recognition service */
private RecognitionServiceBinder mBinder = new RecognitionServiceBinder(this);
/**
* The current callback of an application that invoked the
* {@link RecognitionService#onStartListening(Intent, Callback)} method
*/
private Callback mCurrentCallback = null;
private static final int MSG_START_LISTENING = 1;
private static final int MSG_STOP_LISTENING = 2;
private static final int MSG_CANCEL = 3;
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_START_LISTENING:
StartListeningArgs args = (StartListeningArgs) msg.obj;
dispatchStartListening(args.mIntent, args.mListener);
break;
case MSG_STOP_LISTENING:
dispatchStopListening((RecognitionListener) msg.obj);
break;
case MSG_CANCEL:
dispatchCancel((RecognitionListener) msg.obj);
}
}
};
private void dispatchStartListening(Intent intent, android.speech.RecognitionService.Callback mListener) {
if (mCurrentCallback == null) {
//if (DBG) Log.d(TAG, "created new mCurrentCallback, listener = " + mListener.asBinder());
mCurrentCallback = new Callback(mListener);
SimpleVoiceService.this.onStartListening(intent, mCurrentCallback);
} else {
try {
mListener.error(SpeechRecognizer.ERROR_RECOGNIZER_BUSY);
} catch (RemoteException e) {
Log.d(TAG, "onError call from startListening failed");
}
Log.i(TAG, "concurrent startListening received - ignoring this call");
}
}
private void dispatchStopListening(RecognitionListener listener) {
if (mCurrentCallback == null) {
listener.onError(SpeechRecognizer.ERROR_CLIENT);
Log.w(TAG, "stopListening called with no preceding startListening - ignoring");
} else if (mCurrentCallback.mListener != listener) {
listener.onError(SpeechRecognizer.ERROR_RECOGNIZER_BUSY);
Log.w(TAG, "stopListening called by other caller than startListening - ignoring");
} else { // the correct state
SimpleVoiceService.this.onStopListening(mCurrentCallback);
}
}
private void dispatchCancel(RecognitionListener listener) {
if (mCurrentCallback == null) {
if (DBG) Log.d(TAG, "cancel called with no preceding startListening - ignoring");
} else if (mCurrentCallback.mListener != listener) {
Log.w(TAG, "cancel called by client who did not call startListening - ignoring");
} else { // the correct state
SimpleVoiceService.this.onCancel(mCurrentCallback);
mCurrentCallback = null;
if (DBG) Log.d(TAG, "canceling - setting mCurrentCallback to null");
}
}
private class StartListeningArgs {
public final Intent mIntent;
public final android.speech.RecognitionService.Callback mListener;
public StartListeningArgs(Intent intent, android.speech.RecognitionService.Callback listener) {
this.mIntent = intent;
this.mListener = listener;
}
}
/**
* Checks whether the caller has sufficient permissions
*
* @param listener to send the error message to in case of error
* @return {@code true} if the caller has enough permissions, {@code false} otherwise
*/
private boolean checkPermissions(android.speech.RecognitionService.Callback listener) {
if (DBG) Log.d(TAG, "checkPermissions");
if (SimpleVoiceService.this.checkCallingOrSelfPermission(android.Manifest.permission.
RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) {
return true;
}
Log.e(TAG, "call for recognition service without RECORD_AUDIO permissions");
try {
listener.error(SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
/**
* Notifies the service that it should start listening for speech.
*
* @param recognizerIntent contains parameters for the recognition to be performed. The intent
* may also contain optional extras, see {@link RecognizerIntent}. If these values are
* not set explicitly, default values should be used by the recognizer.
* @param listener that will receive the service's callbacks
*/
protected abstract void onStartListening(Intent recognizerIntent, Callback listener);
/**
* Notifies the service that it should cancel the speech recognition.
*/
protected abstract void onCancel(Callback listener);
/**
* Notifies the service that it should stop listening for speech. Speech captured so far should
* be recognized as if the user had stopped speaking at this point. This method is only called
* if the application calls it explicitly.
*/
protected abstract void onStopListening(Callback listener);
@Override
public final IBinder onBind(final Intent intent) {
if (DBG) Log.d(TAG, "onBind, intent=" + intent);
return (IBinder) mBinder;
}
@Override
public void onDestroy() {
if (DBG) Log.d(TAG, "onDestroy");
mCurrentCallback = null;
mBinder.clearReference();
super.onDestroy();
}
/**
* This class receives callbacks from the speech recognition service and forwards them to the
* user. An instance of this class is passed to the
* {@link RecognitionService#onStartListening(Intent, Callback)} method. Recognizers may call
* these methods on any thread.
*/
public class Callback {
private final android.speech.RecognitionService.Callback mListener;
private Callback(android.speech.RecognitionService.Callback mListener2) {
mListener = mListener2;
}
/**
* The service should call this method when the user has started to speak.
*/
public void beginningOfSpeech() throws RemoteException {
if (DBG) Log.d(TAG, "beginningOfSpeech");
mListener.beginningOfSpeech();
}
/**
* The service should call this method when sound has been received. The purpose of this
* function is to allow giving feedback to the user regarding the captured audio.
*
* @param buffer a buffer containing a sequence of big-endian 16-bit integers representing a
* single channel audio stream. The sample rate is implementation dependent.
*/
public void bufferReceived(byte[] buffer) throws RemoteException {
mListener.bufferReceived(buffer);
}
/**
* The service should call this method after the user stops speaking.
*/
public void endOfSpeech() throws RemoteException {
mListener.endOfSpeech();
}
/**
* The service should call this method when a network or recognition error occurred.
*
* @param error code is defined in {@link SpeechRecognizer}
*/
public void error(int error) throws RemoteException {
mCurrentCallback = null;
mListener.error(error);
}
/**
* The service should call this method when partial recognition results are available. This
* method can be called at any time between {@link #beginningOfSpeech()} and
* {@link #results(Bundle)} when partial results are ready. This method may be called zero,
* one or multiple times for each call to {@link SpeechRecognizer#startListening(Intent)},
* depending on the speech recognition service implementation.
*
* @param partialResults the returned results. To retrieve the results in
* ArrayList<String> format use {@link Bundle#getStringArrayList(String)} with
* {@link SpeechRecognizer#RESULTS_RECOGNITION} as a parameter
*/
public void partialResults(Bundle partialResults) throws RemoteException {
mListener.partialResults(partialResults);
}
/**
* The service should call this method when the endpointer is ready for the user to start
* speaking.
*
* @param params parameters set by the recognition service. Reserved for future use.
*/
public void readyForSpeech(Bundle params) throws RemoteException {
mListener.readyForSpeech(params);
}
/**
* The service should call this method when recognition results are ready.
*
* @param results the recognition results. To retrieve the results in {@code
* ArrayList<String>} format use {@link Bundle#getStringArrayList(String)} with
* {@link SpeechRecognizer#RESULTS_RECOGNITION} as a parameter
*/
public void results(Bundle results) throws RemoteException {
mCurrentCallback = null;
mListener.results(results);
}
/**
* The service should call this method when the sound level in the audio stream has changed.
* There is no guarantee that this method will be called.
*
* @param rmsdB the new RMS dB value
*/
public void rmsChanged(float rmsdB) throws RemoteException {
mListener.rmsChanged(rmsdB);
}
}
/** Binder of the recognition service */
private static class RecognitionServiceBinder extends RecognitionService {
private SimpleVoiceService mInternalService;
public RecognitionServiceBinder(SimpleVoiceService simpleVoiceService) {
mInternalService = simpleVoiceService;
}
@Override
protected void onStartListening(Intent recognizerIntent, Callback listener) {
//if (DBG) Log.d(TAG, "startListening called by:" + listener.asBinder());
if (mInternalService != null && mInternalService.checkPermissions(listener)) {
mInternalService.mHandler.sendMessage(Message.obtain(mInternalService.mHandler,
MSG_START_LISTENING, mInternalService.new StartListeningArgs(
recognizerIntent, listener)));
}
}
@Override
protected void onStopListening(Callback listener) {
//if (DBG) Log.d(TAG, "stopListening called by:" + listener.asBinder());
if (mInternalService != null && mInternalService.checkPermissions(listener)) {
mInternalService.mHandler.sendMessage(Message.obtain(mInternalService.mHandler,
MSG_STOP_LISTENING, listener));
}
}
@Override
protected void onCancel(Callback listener) {
//if (DBG) Log.d(TAG, "cancel called by:" + listener.asBinder());
if (mInternalService != null && mInternalService.checkPermissions(listener)) {
mInternalService.mHandler.sendMessage(Message.obtain(mInternalService.mHandler,
MSG_CANCEL, listener));
}
}
public void clearReference() {
mInternalService = null;
}
}
}
这是我的MainActivity
public class MainActivity extends Activity
{
private static final String TAG = "Activity";
private TextView txtMsg; // TextView that shows the number
private Handler mHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtMsg = (TextView)findViewById(R.id.lbl_info);
final ServiceConnection serviceConnection = new ServiceConnection()
{
@Override
public void onServiceConnected(ComponentName name, IBinder service)
{
// TODO Auto-generated method stub
}
@Override
public void onServiceDisconnected(ComponentName name)
{
// TODO Auto-generated method stub
}
};
Thread t = new Thread()
{
public void run()
{
//Start service
getApplicationContext().bindService(
new Intent(getApplicationContext(), SimpleVoiceService.class),
serviceConnection,
Context.BIND_AUTO_CREATE);
}
};
t.start();
//Create handler for receiving messages
mHandler = new Handler(Looper.getMainLooper())
{
@Override
public void handleMessage(Message inputMessage)
{
//switch(inputMessage.what)
//{
//case 4:
//{
txtMsg.setText((String)inputMessage.obj);
//break;
//}
//}
}
};
//mHandler.sendMessage(Message.obtain(mHandler, 1));
txtMsg.setText("Service Started");
}
这是我的Manifest（这是Google玻璃项目）
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.quadcontrol"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="com.google.android.glass.permission.DEVELOPMENT" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:immersive="true" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:icon="@drawable/ic_launcher" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.speech.action.RECOGNIZE_SPEECH" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<action android:name="com.google.android.glass.action.VOICE_TRIGGER" />
</intent-filter>
<meta-data
android:name="com.google.angroid.glass.VoiceTrigger"
android:resource="@xml/voice_trigger" />
</activity>
<recognition-service
android:name="WordService"
android:icon="@drawable/ic_launcher"
android:label="@string/service_name">
<intent-filter>
<action android:name="android.speech.RecognitionService" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</recognition-service>
</application>
</manifest>
由于
答案 0 :(得分：0)
当你说：
绑定服务后线程立即死亡
我希望您的日志中会出现堆栈跟踪异常。这可能会对实际发生的事情有所了解。
仔细看看，您指定的服务类是抽象的....
public abstract class SimpleVoiceService extends Service
我现在没有Android开发环境来确认这一点，但我不确定这可以这样工作。删除abstract修饰符，或绑定到另一个扩展此修饰符的非抽象服务。
另外，为什么要在线程中绑定服务？而不是：
Thread t = new Thread() { public void run() { //Start service getApplicationContext().bindService( new Intent(getApplicationContext(), SimpleVoiceService.class), serviceConnection, Context.BIND_AUTO_CREATE); } }; t.start();
你为什么不这样做：
getApplicationContext().bindService(
new Intent(getApplicationContext(), SimpleVoiceService.class),
serviceConnection,
Context.BIND_AUTO_CREATE);