我正在使用Android Twitter客户端，当我的Android设备中执行代码时，它显示“不幸的是，appname已停止工作”
这是logcat：
12-16 23:12:08.685: E/AndroidRuntime(23850): FATAL EXCEPTION: main
12-16 23:12:08.685: E/AndroidRuntime(23850): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androidtwitterclient/com.example.androidtwitterclient.MainActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10183 nor current process has android.permission.ACCESS_NETWORK_STATE.
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread.access$600(ActivityThread.java:140)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.os.Handler.dispatchMessage(Handler.java:99)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.os.Looper.loop(Looper.java:137)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread.main(ActivityThread.java:4898)
12-16 23:12:08.685: E/AndroidRuntime(23850): at java.lang.reflect.Method.invokeNative(Native Method)
12-16 23:12:08.685: E/AndroidRuntime(23850): at java.lang.reflect.Method.invoke(Method.java:511)
12-16 23:12:08.685: E/AndroidRuntime(23850): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
12-16 23:12:08.685: E/AndroidRuntime(23850): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
12-16 23:12:08.685: E/AndroidRuntime(23850): at dalvik.system.NativeStart.main(Native Method)
12-16 23:12:08.685: E/AndroidRuntime(23850): Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10183 nor current process has android.permission.ACCESS_NETWORK_STATE.
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.os.Parcel.readException(Parcel.java:1425)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.os.Parcel.readException(Parcel.java:1379)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.net.IConnectivityManager$Stub$Proxy.getActiveNetworkInfo(IConnectivityManager.java:667)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.net.ConnectivityManager.getActiveNetworkInfo(ConnectivityManager.java:458)
12-16 23:12:08.685: E/AndroidRuntime(23850): at com.example.androidtwitterclient.MainActivity.downloadTweets(MainActivity.java:46)
12-16 23:12:08.685: E/AndroidRuntime(23850): at com.example.androidtwitterclient.MainActivity.onCreate(MainActivity.java:40)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.Activity.performCreate(Activity.java:5206)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
12-16 23:12:08.685: E/AndroidRuntime(23850): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
12-16 23:12:08.685: E/AndroidRuntime(23850): ... 11 more
这是我的AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidtwitterclient"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<activity
android:name="com.example.androidtwitterclient.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
但是我的MainActivity.java很安静。
package com.example.androidtwitterclient;
import android.app.ListActivity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.widget.ArrayAdapter;
import com.google.gson.Gson;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import java.io.*;
import java.net.URLEncoder;
/**
* Demonstrates how to use a twitter application keys to access a user's timeline
*/
public class MainActivity extends ListActivity {
private ListActivity activity;
final static String ScreenName = "elvirachrisanty";
final static String LOG_TAG = "rnc";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity = this;
downloadTweets();
}
// download twitter timeline after first checking to see if there is a network connection
public void downloadTweets() {
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
new DownloadTwitterTask().execute(ScreenName);
} else {
Log.v(LOG_TAG, "No network connection available.");
}
}
// Uses an AsyncTask to download a Twitter user's timeline
private class DownloadTwitterTask extends AsyncTask<String, Void, String> {
final static String CONSUMER_KEY = "xxxxxxxxxxxxxxx";
final static String CONSUMER_SECRET = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
final static String TwitterTokenURL = "https://api.twitter.com/oauth2/token";
final static String TwitterStreamURL = "https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=";
@Override
protected String doInBackground(String... screenNames) {
String result = null;
if (screenNames.length > 0) {
result = getTwitterStream(screenNames[0]);
}
return result;
}
// onPostExecute convert the JSON results into a Twitter object (which is an Array list of tweets
@Override
protected void onPostExecute(String result) {
Twitter twits = jsonToTwitter(result);
// lets write the results to the console as well
for (Tweet tweet : twits) {
Log.i(LOG_TAG, tweet.getText());
}
// send the tweets to the adapter for rendering
ArrayAdapter<Tweet> adapter = new ArrayAdapter<Tweet>(activity, android.R.layout.simple_list_item_1, twits);
setListAdapter(adapter);
}
// converts a string of JSON data into a Twitter object
private Twitter jsonToTwitter(String result) {
Twitter twits = null;
if (result != null && result.length() > 0) {
try {
Gson gson = new Gson();
twits = gson.fromJson(result, Twitter.class);
} catch (IllegalStateException ex) {
// just eat the exception
}
}
return twits;
}
// convert a JSON authentication object into an Authenticated object
private Authenticated jsonToAuthenticated(String rawAuthorization) {
Authenticated auth = null;
if (rawAuthorization != null && rawAuthorization.length() > 0) {
try {
Gson gson = new Gson();
auth = gson.fromJson(rawAuthorization, Authenticated.class);
} catch (IllegalStateException ex) {
// just eat the exception
}
}
return auth;
}
private String getResponseBody(HttpRequestBase request) {
StringBuilder sb = new StringBuilder();
try {
DefaultHttpClient httpClient = new DefaultHttpClient(new BasicHttpParams());
HttpResponse response = httpClient.execute(request);
int statusCode = response.getStatusLine().getStatusCode();
String reason = response.getStatusLine().getReasonPhrase();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
String line = null;
while ((line = bReader.readLine()) != null) {
sb.append(line);
}
} else {
sb.append(reason);
}
} catch (UnsupportedEncodingException ex) {
} catch (ClientProtocolException ex1) {
} catch (IOException ex2) {
}
return sb.toString();
}
private String getTwitterStream(String screenName) {
String results = null;
// Step 1: Encode consumer key and secret
try {
// URL encode the consumer key and secret
String urlApiKey = URLEncoder.encode(CONSUMER_KEY, "UTF-8");
String urlApiSecret = URLEncoder.encode(CONSUMER_SECRET, "UTF-8");
// Concatenate the encoded consumer key, a colon character, and the
// encoded consumer secret
String combined = urlApiKey + ":" + urlApiSecret;
// Base64 encode the string
String base64Encoded = Base64.encodeToString(combined.getBytes(), Base64.NO_WRAP);
// Step 2: Obtain a bearer token
HttpPost httpPost = new HttpPost(TwitterTokenURL);
httpPost.setHeader("Authorization", "Basic " + base64Encoded);
httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
httpPost.setEntity(new StringEntity("grant_type=client_credentials"));
String rawAuthorization = getResponseBody(httpPost);
Authenticated auth = jsonToAuthenticated(rawAuthorization);
// Applications should verify that the value associated with the
// token_type key of the returned object is bearer
if (auth != null && auth.token_type.equals("bearer")) {
// Step 3: Authenticate API requests with bearer token
HttpGet httpGet = new HttpGet(TwitterStreamURL + screenName);
// construct a normal HTTPS request and include an Authorization
// header with the value of Bearer <>
httpGet.setHeader("Authorization", "Bearer " + auth.access_token);
httpGet.setHeader("Content-Type", "application/json");
// update the results with the body of the response
results = getResponseBody(httpGet);
}
} catch (UnsupportedEncodingException ex) {
} catch (IllegalStateException ex1) {
}
return results;
}
}
}
真的很感激任何帮助
答案 0 :(得分：2)
从错误日志中可以解释为您缺少访问清单中网络状态的权限。
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />