我正在创建一个简单的应用程序。我目前发现的是，当我打开我的应用程序时，.gradle文件夹中设置了以下权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
然而，我的应用程序有一个名为Gvoice.java的第二个活动，然后依赖谷歌语音文本。
我发现如果我在.gradle文件夹中保留上述权限，我的主活动窗口与pocketsphinx完美配合。但是，我的Gvoice活动给了我一条消息'Can't open microphone'。
但我发现如果删除.gradle文件夹中的三个权限。我的主要活动不再按照我的要求行事，但我的第二个活动叫做Gvoice，现在正确地将语音转换为文本而不会给我'Can't open microphone'消息。
有没有一种简单的方法可以解决这个问题，因为我认为它肯定与麦克风权限有关。还请注意，每当我返回主活动时，都需要设置权限，当我在主活动之外的另一个活动时，它需要禁用权限（或者如果还有另一种方法可以执行此操作）。
是否可以为清单文件中的不同活动设置不同的权限？
下面我已经更新了我到目前为止所看到的内容请看看：
public class PocketSphinxActivity extends Activity implements RecognitionListener
{
private static final String KWS_SEARCH = "wakeup";
/* Keyword we are looking for to activate menu */
private static final String KEYPHRASE = "open voice command"; //adjust this keyphrase here and in string!
private SpeechRecognizer recognizer;
private HashMap<String, Integer> captions;
ListView lv;
TextView tv;
EditText a;
Button b;
Button c;
Boolean isDone = false;
@Override
public void onCreate(Bundle state) {
super.onCreate(state);
// Prepare the data for UI
captions = new HashMap<String, Integer>();
captions.put(KWS_SEARCH, R.string.kws_caption);
setContentView(R.layout.main);
((TextView) findViewById(R.id.caption_text))
.setText("Preparing the recognizer");
lv = (ListView) findViewById(R.id.lvVoiceReturn);
tv = (TextView) findViewById(R.id.result_text);
a = (EditText) findViewById(R.id.TFusername);
b = (Button) findViewById(R.id.bVoice);
c = (Button)findViewById(R.id.Blogin);
// Recognizer initialization is a time-consuming and it involves IO,
// so we execute it in async task
new AsyncTask<Void, Void, Exception>() {
@Override
protected Exception doInBackground(Void... params) {
try {
Assets assets = new Assets(PocketSphinxActivity.this);
File assetDir = assets.syncAssets();
setupRecognizer(assetDir);
} catch (IOException e) {
return e;
}
return null;
}
@Override
protected void onPostExecute(Exception result) {
if (result != null) {
((TextView) findViewById(R.id.caption_text))
.setText("Failed to init recognizer " + result);
} else {
switchSearch(KWS_SEARCH);
}
}
}.execute();
//line added.../////////////////////////
a.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().trim().equalsIgnoreCase("open voice command")) {
//
//Do your stuff here OR button.performClick()
//
//DELAY
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
if (!isDone) {
b.performClick();
isDone = true;
}
}
}, 500);
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
////////////////////////////////////////
}
@Override
public void onDestroy() {
super.onDestroy();
recognizer.cancel();
recognizer.shutdown();
}
/**
* In partial result we get quick updates about current hypothesis. In
* keyword spotting mode we can react here, in other modes we need to wait
* for final result in onResult.
*/
@Override
public void onPartialResult(Hypothesis hypothesis) {
if (hypothesis == null)
return;
String text = hypothesis.getHypstr();
//((TextView) findViewById(R.id.result_text)).setText(text);
((EditText) findViewById(R.id.TFusername)).setText(text);
}
/**
* This callback is called when we stop the recognizer.
*/
@Override
public void onResult(Hypothesis hypothesis) {
//((TextView) findViewById(R.id.result_text)).setText("");
((EditText) findViewById(R.id.TFusername)).setText("");
if (hypothesis != null) {
String text = hypothesis.getHypstr();
makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
//a.setText((String) tv.getText());
//tv = TextView.getText().toString();
}
}
@Override
public void onBeginningOfSpeech() {
}
/**
* We stop recognizer here to get a final result
*/
@Override
public void onEndOfSpeech() {
if (!recognizer.getSearchName().equals(KWS_SEARCH))
switchSearch(KWS_SEARCH);
}
private void switchSearch(String searchName) {
recognizer.stop();
// If we are not spotting, start listening with timeout (10000 ms or 10 seconds).
if (searchName.equals(KWS_SEARCH))
recognizer.startListening(searchName);
else
recognizer.startListening(searchName, 10000);
String caption = getResources().getString(captions.get(searchName));
((TextView) findViewById(R.id.caption_text)).setText(caption);
}
private void setupRecognizer(File assetsDir) throws IOException {
// The recognizer can be configured to perform multiple searches
// of different kind and switch between them
recognizer = defaultSetup()
.setAcousticModel(new File(assetsDir, "en-us-ptm"))
.setDictionary(new File(assetsDir, "cmudict-en-us.dict"))
// To disable logging of raw audio comment out this call (takes a lot of space on the device)
.setRawLogDir(assetsDir)
// Threshold to tune for keyphrase to balance between false alarms and misses
.setKeywordThreshold(1e-45f)
// Use context-independent phonetic search, context-dependent is too slow for mobile
.setBoolean("-allphone_ci", true)
.getRecognizer();
recognizer.addListener(this);
/** In your application you might not need to add all those searches.
* They are added here for demonstration. You can leave just one.
*/
// Create keyword-activation search.
recognizer.addKeyphraseSearch(KWS_SEARCH, KEYPHRASE);
}
@Override
public void onError(Exception error) {
((TextView) findViewById(R.id.caption_text)).setText(error.getMessage());
}
@Override
public void onTimeout() {
switchSearch(KWS_SEARCH);
}
//Assign button clicks to go to a new activity:
public void onButtonClick_1(View v){
if (v.getId() == R.id.bVoice){
String str_1 = a.getText().toString();
//Go to the relevant page if any part of the phrase or word entered in the 'EditText' field contains 'command' which is not case sensitive
if (str_1.toLowerCase().contains("command")) {
Intent userintent = new Intent(PocketSphinxActivity.this, Gvoice.class);
startActivity(userintent);
} else {
Toast.makeText(getApplicationContext(), "Incorrect Information", Toast.LENGTH_SHORT).show();
}
}
}
答案 0 :(得分：0)
在我的评论中我说：
使用noHistory不是解决方案，它恰好适用于大多数情况。当您的应用不再位于前台时，由于收到来电等原因，您不希望丢失用户体验，而是希望暂停。正确管理onPause和onResume是一个基本的基本要求，使用noHistory将暂时避免使用。
以下是您的应用暂停并随后恢复时如何管理recognizer对象的示例。
@Override
protected void onResume() {
super.onResume();
if (recognizer == null) {
// Set up recognizer again
}
}
@Override
protected void onPause() {
super.onPause();
if (recognizer != null) {
recognizer.cancel();
recognizer.shutdown();
recognizer = null;
}
}
虽然每次暂停时销毁您的应用，都会解决释放麦克风和识别器资源的解决方案，这不是您想要做的 - 您希望优雅地管理您的生命周期应用程序进入后台并再次进入前台，没有您持有的资源（如麦克风）导致其他应用程序出现问题。
答案 1 :(得分：-1)
我已经想出了另一种方法是将以下内容添加到我的清单文件android:noHistory="true"中，这似乎清除了主活动堆栈的历史记录，现在onClickListener正在第二个活动中工作。
另一种方法是将以下内容放在我的MainActivity文件的底部，这是@brandall建议的onPause方法：
@Override
protected void onPause() {
super.onPause();
finish();
}