我有这个语音识别的例子。我为httppost命令添加了一些代码。我想，当我说DOG这个词来制作一个httppost。一切正常，但是当我说“狗”这个词以及它应该做我的httppost时我会得到这些错误：
05-25 21:31:24.889: D/AndroidRuntime(15191): Shutting down VM
05-25 21:31:24.889: W/dalvikvm(15191): threadid=1: thread exiting with uncaught exception (group=0x40aab300)
05-25 21:31:24.909: E/AndroidRuntime(15191): FATAL EXCEPTION: main
05-25 21:31:24.909: E/AndroidRuntime(15191): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1001, result=-1, data=Intent { (has extras) }} to activity {com.rakesh.voicerecognitionexample/com.rakesh.voicerecognitionexample.VoiceRecognitionActivity}: android.os.NetworkOnMainThreadException
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread.deliverResults(ActivityThread.java:3267)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3310)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread.access$1100(ActivityThread.java:142)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.os.Looper.loop(Looper.java:137)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread.main(ActivityThread.java:4931)
05-25 21:31:24.909: E/AndroidRuntime(15191): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 21:31:24.909: E/AndroidRuntime(15191): at java.lang.reflect.Method.invoke(Method.java:511)
05-25 21:31:24.909: E/AndroidRuntime(15191): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
05-25 21:31:24.909: E/AndroidRuntime(15191): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
05-25 21:31:24.909: E/AndroidRuntime(15191): at dalvik.system.NativeStart.main(Native Method)
05-25 21:31:24.909: E/AndroidRuntime(15191): Caused by: android.os.NetworkOnMainThreadException
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
05-25 21:31:24.909: E/AndroidRuntime(15191): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
05-25 21:31:24.909: E/AndroidRuntime(15191): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
05-25 21:31:24.909: E/AndroidRuntime(15191): at java.net.InetAddress.getAllByName(InetAddress.java:214)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-25 21:31:24.909: E/AndroidRuntime(15191): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-25 21:31:24.909: E/AndroidRuntime(15191): at com.rakesh.voicerecognitionexample.VoiceRecognitionActivity.cici(VoiceRecognitionActivity.java:157)
05-25 21:31:24.909: E/AndroidRuntime(15191): at com.rakesh.voicerecognitionexample.VoiceRecognitionActivity.onActivityResult(VoiceRecognitionActivity.java:113)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.Activity.dispatchActivityResult(Activity.java:5192)
05-25 21:31:24.909: E/AndroidRuntime(15191): at android.app.ActivityThread.deliverResults(ActivityThread.java:3263)
05-25 21:31:24.909: E/AndroidRuntime(15191): ... 11 more
这是我的代码：
package com.rakesh.voicerecognitionexample;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;
public class VoiceRecognitionActivity extends Activity {
private static final int VOICE_RECOGNITION_REQUEST_CODE = 1001;
private EditText metTextHint;
private ListView mlvTextMatches;
private Spinner msTextMatches;
private Button mbtSpeak;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_voice_recognition);
metTextHint = (EditText) findViewById(R.id.etTextHint);
mlvTextMatches = (ListView) findViewById(R.id.lvTextMatches);
msTextMatches = (Spinner) findViewById(R.id.sNoOfMatches);
mbtSpeak = (Button) findViewById(R.id.btSpeak);
}
public void checkVoiceRecognition() {
// Check if voice recognition is present
PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (activities.size() == 0) {
mbtSpeak.setEnabled(false);
Toast.makeText(this, "Voice recognizer not present",
Toast.LENGTH_SHORT).show();
}
}
public void speak(View view) {
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
// Specify the calling package to identify your application
intent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, getClass()
.getPackage().getName());
// Display an hint to the user about what he should say.
intent.putExtra(RecognizerIntent.EXTRA_PROMPT, metTextHint.getText()
.toString());
// Given an hint to the recognizer about what the user is going to say
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH);
// If number of Matches is not selected then return show toast message
if (msTextMatches.getSelectedItemPosition() == AdapterView.INVALID_POSITION) {
Toast.makeText(this, "Please select No. of Matches from spinner",
Toast.LENGTH_SHORT).show();
return;
}
int noOfMatches = Integer.parseInt(msTextMatches.getSelectedItem()
.toString());
// Specify how many results you want to receive. The results will be
// sorted where the first result is the one with higher confidence.
intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, noOfMatches);
startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE)
//If Voice recognition is successful then it returns RESULT_OK
if(resultCode == RESULT_OK) {
ArrayList<String> textMatchList = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
if (!textMatchList.isEmpty()) {
// If first Match contains the 'search' word
// Then start web search.
if (textMatchList.get(0).contains("search")) {
String searchQuery = textMatchList.get(0).replace("search",
" ");
Intent search = new Intent(Intent.ACTION_WEB_SEARCH);
search.putExtra(SearchManager.QUERY, searchQuery);
startActivity(search);
} else if (textMatchList.get(0).contains("dog")) {
postTo();
} else {
// populate the Matches
mlvTextMatches
.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
textMatchList));
}
}
//Result code for various error.
}else if(resultCode == RecognizerIntent.RESULT_AUDIO_ERROR){
showToastMessage("Audio Error");
}else if(resultCode == RecognizerIntent.RESULT_CLIENT_ERROR){
showToastMessage("Client Error");
}else if(resultCode == RecognizerIntent.RESULT_NETWORK_ERROR){
showToastMessage("Network Error");
}else if(resultCode == RecognizerIntent.RESULT_NO_MATCH){
showToastMessage("No Match");
}else if(resultCode == RecognizerIntent.RESULT_SERVER_ERROR){
showToastMessage("Server Error");
}
super.onActivityResult(requestCode, resultCode, data);
}
void showToastMessage(String message){
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
public void postTo()
{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://mysite.com/script.php");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("message", "cracanel"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
}
答案 0 :(得分：4)
它是NetworkOnMainThread异常。您无法在主ui线程上运行与网络相关的操作。你应该为此目的使用asynctask。
http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
对于asynctask
http://developer.android.com/reference/android/os/AsyncTask.html
您还可以创建自己的线程并执行httppost。但请确保您不要在backgroudn线程上更新ui。 Asyntask让你更容易
示例：
class TheTask extends AsyncTask<Void,Void,Void>
{
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
// invoked on the ui thread.
// display progress dialog
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
//invoked on the ui thread
// dismiss progress dialog
// result of doinbackground computation is a parameter to this
// can update ui here
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
//invoked on the background thread
// do not update ui
// execute http post here
postTo(); // call your post method here
return null;
}
}
用法：
new TheTask().execute(); // load on ui thread
可以将参数传递给asynctask的构造函数。您也可以直接将参数传递给doinbackground。
答案 1 :(得分：2)
您需要在单独的线程或AsyncTask上进行网络连接。
你可以在这里的代码中看到我是如何做到这一点的（AsyncTask + callback）：https://github.com/nedwidek/Android-Rest-API
或使用搜索查找许多其他示例。如： - android wait asynctask to finish - Using wait in AsyncTask
AsyncTask适用于短期后台任务（例如网络访问）。
答案 2 :(得分：0)
只是一个简单的外部线程，如果您需要在此过程中更新UI，请使用Asynctask 在您的代码中尝试此操作：
else if (textMatchList.get(0).contains("dog")) {
Thread backgroundThread = new Thread(new Runnable() {
@Override
public void run() {
postTo();
}
});
backgroundThread.start();
}
答案 3 :(得分：0)
您无法在UI线程上进行联网。使用AsyncTask。