qrobot开发总结之android语音识别
android sdk提供了语音识别的接口，有些人在网上找了例子发现运行不了（PS：网上的例子基本就那一个，都是各种转载的），原因在于手机没有安装google语音搜索软件！去网上下载一个安上就可以了，另外需保持手机网络畅通。
第一种方法：这种方法会显示一个语音对话框，各种提示信息会显示的比较清晰，也是实现起来最简单的。
触发语音识别是调用
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "您的语音将转化为文字");
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
VOICE_RECOGNITION_REQUEST_CODE这个是一个静态的全局变量
sdk解释是：requestCode If>= 0, this code will be returned in onActivityResult() when the activity exits.
然后复写onActivityResult()方法：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == VOICE_RECOGNITION_REQUEST_CODE && resultCode == RESULT_OK){
ArrayList results = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
Toast.makeText(MainActivity.this, matches.get(0), Toast.LENGTH_LONG).show();
//to do sth
}
super.onActivityResult(requestCode, resultCode, data);
}
第2中方法：这种方法是不显示对话框，完全在后台运行，给用户的体验会更好一些。
初始化：
SpeechRecognizer recognizer = SpeechRecognizer.createSpeechRecognizer(this);
recognizer.setRecognitionListener(new listener());
触发语音识别时调用
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra("calling_package", "VoiceIME");
intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 1);
recognizer.startListening(intent);
区别于第一种方法，这种方法要实现一个接口RecognitionListener类
class listener implements RecognitionListener {
public void onReadyForSpeech(Bundle params) {
}
public void onBeginningOfSpeech() {
}
public void onRmsChanged(float rmsdB) {
}
public void onBufferReceived(byte[] buffer) {
}
public void onEndOfSpeech() {
}
public void onError(int error) {
String s = "";
switch(error){
case SpeechRecognizer.ERROR_AUDIO:
s = "录音设别错误";
break;
case SpeechRecognizer.ERROR_CLIENT:
s = "其他客户端错误";
break;
case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS:
s = "权限不足";
break;
case SpeechRecognizer.ERROR_NETWORK:
s = "网络连接错误";
break;
case SpeechRecognizer.ERROR_NETWORK_TIMEOUT:
s = "网络连接超时";
break;
case SpeechRecognizer.ERROR_NO_MATCH:
s = "没有匹配项";
break;
case SpeechRecognizer.ERROR_RECOGNIZER_BUSY:
s = "识别服务繁忙";
break;
case SpeechRecognizer.ERROR_SERVER:
s = "识别服务器错误";
break;
case SpeechRecognizer.ERROR_SPEECH_TIMEOUT:
s = "无语音输入";
break;
}
s += " 请重试";
Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
}
public void onResults(Bundle results) {
recognizer_result = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION).get(0);
Toast.makeText(MainActivity.this, recognizer_result, Toast.LENGTH_SHORT).show();
}
public void onPartialResults(Bundle partialResults) {
}
public void onEvent(int eventType, Bundle params) {
}
}
看方法的名字相信大家应该就知道要干什么了，多看文档。起初我觉得用第2中方法给用户的提示信息太少，往往出错了，用户不知道是怎么回事。后面看文档才发现google android sdk已经定义了很多错误的错误号，只要根据不同错误给出恰当的提示就好了！