语音识别作为后台服务

是否有可能实施一项活动作为一项服务? 我的活动是一个语音识别活动。 我想要在应用程序的后台运行活动,不断检查语音,当用户说出一个命令时,它会识别它,然后执行操作。 我的问题是…是否有可能这样做,如果是这样,后台服务如何通知当前的活动或应用程序? 有一个在这方面的前哨,但没有明确的答案…感谢您的任何意见或帮助。 这是从另一个stackoverflowpost采取的语音活动:

import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.speech.RecognitionListener; import android.speech.RecognizerIntent; import android.speech.SpeechRecognizer; import android.widget.Button; import android.widget.TextView; import java.util.ArrayList; import android.util.Log; public class voiceRecognitionTest extends Activity implements OnClickListener { private TextView mText; private SpeechRecognizer sr; private static final String TAG = "MyStt3Activity"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button speakButton = (Button) findViewById(R.id.btn_speak); mText = (TextView) findViewById(R.id.textView1); speakButton.setOnClickListener(this); sr = SpeechRecognizer.createSpeechRecognizer(this); sr.setRecognitionListener(new listener()); } class listener implements RecognitionListener { public void onReadyForSpeech(Bundle params) { Log.d(TAG, "onReadyForSpeech"); } public void onBeginningOfSpeech() { Log.d(TAG, "onBeginningOfSpeech"); } public void onRmsChanged(float rmsdB) { Log.d(TAG, "onRmsChanged"); } public void onBufferReceived(byte[] buffer) { Log.d(TAG, "onBufferReceived"); } public void onEndOfSpeech() { Log.d(TAG, "onEndofSpeech"); } public void onError(int error) { Log.d(TAG, "error " + error); mText.setText("error " + error); } public void onResults(Bundle results) { String str = new String(); Log.d(TAG, "onResults " + results); ArrayList data = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION); for (int i = 0; i < data.size(); i++) { Log.d(TAG, "result " + data.get(i)); str += data.get(i); } mText.setText("results: "+String.valueOf(data.size())); } public void onPartialResults(Bundle partialResults) { Log.d(TAG, "onPartialResults"); } public void onEvent(int eventType, Bundle params) { Log.d(TAG, "onEvent " + eventType); } } public void onClick(View v) { if (v.getId() == R.id.btn_speak) { Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH); intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM); intent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE,"voice.recognition.test"); intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS,5); sr.startListening(intent); Log.i("111111","11111111"); } } 

}

你可以做的是启动识别器的活动,这将监听命令,当它find一个合适的命令,它将做任何你想要它做的特定命令。 这个简单的方法的问题是,活动将不断地倾听语音input,更重要的是它需要在焦点上,而不是在后台运行…

http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/VoiceRecognition.html