当前位置:操作系统 > 安卓/Android >>

Android ApiDemos示例解析(46):App->Voice Recognition

这个例子需要Android系统中安装了支持RecognizerIntent.ACTION_RECOGNIZE_SPEECH的应用,比如Google的 Voice Search应用。

 

\

 

模拟器上缺省没有安装,可以参见如何在Android emulator上安装 APK 在模拟器上安装一个Voice Search。

本例VoiceRecognition首先通过PackageManager检测本机是否安装了支持RecognizerIntent.ACTION_RECOGNIZE_SPEECH,如果有,则Enable Speak按钮,否则显示“Recognizer not present”

[java] 
// Check to see if a recognition activity is present   
PackageManager pm = getPackageManager();  
List<ResolveInfo> activities = pm.queryIntentActivities(  
 new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);  
if (activities.size() != 0) {  
 speakButton.setOnClickListener(this);  
} else {  
 speakButton.setEnabled(false);  
 speakButton.setText("Recognizer not present");  

// Check to see if a recognition activity is present
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(
 new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (activities.size() != 0) {
 speakButton.setOnClickListener(this);
} else {
 speakButton.setEnabled(false);
 speakButton.setText("Recognizer not present");
}

 

如果本机上安装了Google的Voice Search,点击“Speak!”则会启动语音输入对话框:

 

\


Speak按钮对应的代码如下:

[java] 
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);  
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,  
 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);  
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");  
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE); 
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Speech recognition demo");
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

 

采用的是startActivityForResult这是因为我们需要从语音输入对话框获取用户输入。RecognizerIntent.EXTRA_PROMPT定义对应框提示。 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM 为语音输入类型,这里使用自由格式,另外一种为WEB_SEARCH主要用于Web搜索。


下面代码响应从语音输入对话框返回值:

[java] 
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE  
    && resultCode == RESULT_OK) {  
 // Fill the list view with the strings the recognizer   
// thought it could have heard   
 ArrayList<String> matches = data.getStringArrayListExtra(  
 RecognizerIntent.EXTRA_RESULTS);  
 mList.setAdapter(new ArrayAdapter<String>(this,  
  android.R.layout.易做图_list_item_1,  
 matches));  

if (requestCode == VOICE_RECOGNITION_REQUEST_CODE
    && resultCode == RESULT_OK) {
 // Fill the list view with the strings the recognizer
// thought it could have heard
 ArrayList<String> matches = data.getStringArrayListExtra(
 RecognizerIntent.EXTRA_RESULTS);
 mList.setAdapter(new ArrayAdapter<String>(this,
  android.R.layout.易做图_list_item_1,
 matches));
}

 

在列表中显示由语音识别返回的文字:

 

\

作者:mapdigit

 

补充:移动开发 , Android ,
CopyRight © 2022 站长资源库 编程知识问答 zzzyk.com All Rights Reserved
部分文章来自网络,