我还是Android编程的新手。我正在阅读一本名为Learning Android的书中的教程。当我点击更新按钮时，我最终崩溃了。知道为什么吗？ Stacktrace在下面。 我得到一个致命的例外：主要
package com.marakana.yamba;
import winterwell.jtwitter.Twitter;
import winterwell.jtwitter.TwitterException;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class StatusActivity extends Activity implements OnClickListener{
private static final String TAG ="StatusActivity";
Twitter twitter;
EditText editText;
Button updateButton ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.status);
// Find Views
editText = (EditText) findViewById(R.id.editText);
updateButton = (Button) findViewById(R.id.updateButton);
updateButton.setOnClickListener(this);
twitter = new Twitter("Yamba18", "undertaker");
twitter.setAPIRootUrl("http://yamba.marakana.com/api");
}
//Asynchronously Post to Twitter
class PostToTwitter extends AsyncTask<String, Integer, String>{
@Override
protected String doInBackground(String... statuses){
try{
winterwell.jtwitter.Status status = twitter.updateStatus(statuses[0]);
return status.text;
}catch(TwitterException e){
Log.e(TAG,e.toString());
e.printStackTrace();
return "Failedd to Post";
}
}
@Override
protected void onProgressUpdate (Integer... values){
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result){
Toast.makeText(StatusActivity.this, result, Toast.LENGTH_LONG).show();
}
}
public void onClick(View v){
twitter.setStatus(editText.getText().toString());
Log.d(TAG, "onClicked");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.status, menu);
return true;
}
}
这是logcat。
09-26 17:25:56.469: D/AndroidRuntime(612): Shutting down VM
09-26 17:25:56.469: W/dalvikvm(612): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
09-26 17:25:56.529: E/AndroidRuntime(612): FATAL EXCEPTION: main
09-26 17:25:56.529: E/AndroidRuntime(612): winterwell.jtwitter.TwitterException: java.io.IOException: Received authentication challenge is null
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.URLConnectionHttpClient.processError(URLConnectionHttpClient.java:533)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.URLConnectionHttpClient.post2_connect(URLConnectionHttpClient.java:413)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.URLConnectionHttpClient.post2(URLConnectionHttpClient.java:379)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.URLConnectionHttpClient.post(URLConnectionHttpClient.java:348)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.Twitter.updateStatus(Twitter.java:2762)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.Twitter.updateStatus(Twitter.java:2694)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.Twitter.setStatus(Twitter.java:2482)
09-26 17:25:56.529: E/AndroidRuntime(612): at com.marakana.yamba.StatusActivity.onClick(StatusActivity.java:68)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.view.View.performClick(View.java:3480)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.view.View$PerformClick.run(View.java:13983)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.os.Handler.handleCallback(Handler.java:605)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.os.Handler.dispatchMessage(Handler.java:92)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.os.Looper.loop(Looper.java:137)
09-26 17:25:56.529: E/AndroidRuntime(612): at android.app.ActivityThread.main(ActivityThread.java:4340)
09-26 17:25:56.529: E/AndroidRuntime(612): at java.lang.reflect.Method.invokeNative(Native Method)
09-26 17:25:56.529: E/AndroidRuntime(612): at java.lang.reflect.Method.invoke(Method.java:511)
09-26 17:25:56.529: E/AndroidRuntime(612): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-26 17:25:56.529: E/AndroidRuntime(612): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-26 17:25:56.529: E/AndroidRuntime(612): at dalvik.system.NativeStart.main(Native Method)
09-26 17:25:56.529: E/AndroidRuntime(612): Caused by: java.io.IOException: Received authentication challenge is null
09-26 17:25:56.529: E/AndroidRuntime(612): at libcore.net.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:397)
09-26 17:25:56.529: E/AndroidRuntime(612): at libcore.net.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:345)
09-26 17:25:56.529: E/AndroidRuntime(612): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:276)
09-26 17:25:56.529: E/AndroidRuntime(612): at libcore.net.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:479)
09-26 17:25:56.529: E/AndroidRuntime(612): at winterwell.jtwitter.URLConnectionHttpClient.processError(URLConnectionHttpClient.java:468)
09-26 17:25:56.529: E/AndroidRuntime(612): ... 18 more
09-26 17:25:59.169: I/Process(612): Sending signal. PID: 612 SIG: 9
答案 0 :(得分：2)
类似的例子对我有用，希望它有所帮助：
修改MainActivity.java：
private static final String OAUTH_KEY = "your_OAUTH_KEY";
private static final String OAUTH_SECRET = "your_OAUTH_SECRET";
private static final String TWITTER_USER = "your_email";
我的文件：
<强> MainActivity.java
package com.marakana.oauth;
import com.marakana.oauth.R;
import oauth.signpost.OAuth;
import oauth.signpost.OAuthConsumer;
import oauth.signpost.OAuthProvider;
import oauth.signpost.basic.DefaultOAuthConsumer;
import oauth.signpost.basic.DefaultOAuthProvider;
import oauth.signpost.exception.OAuthCommunicationException;
import oauth.signpost.exception.OAuthExpectationFailedException;
import oauth.signpost.exception.OAuthMessageSignerException;
import oauth.signpost.exception.OAuthNotAuthorizedException;
import winterwell.jtwitter.OAuthSignpostClient;
import winterwell.jtwitter.Twitter;
import winterwell.jtwitter.TwitterException;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "OAuthDemo";
/********************************
Generate your values on the web::
https://dev.twitter.com/apps/
*********************************/
private static final String OAUTH_KEY = "your_OAUTH_KEY";
private static final String OAUTH_SECRET = "your_OAUTH_SECRET";
private static final String TWITTER_USER = "your_email";
private static final String OAUTH_CALLBACK_SCHEME = "x-marakana-oauth-twitter";
private static final String OAUTH_CALLBACK_URL = OAUTH_CALLBACK_SCHEME + "://callback";
private OAuthSignpostClient oauthClient;
private OAuthConsumer mConsumer;
private OAuthProvider mProvider;
private Twitter twitter;
SharedPreferences prefs;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mConsumer = new DefaultOAuthConsumer(OAUTH_KEY, OAUTH_SECRET);
//mConsumer = new CommonsHttpOAuthConsumer(OAUTH_KEY, OAUTH_SECRET);
mProvider = new DefaultOAuthProvider(
"https://api.twitter.com/oauth/request_token",
"https://api.twitter.com/oauth/access_token",
"https://api.twitter.com/oauth/authorize");
// Read the prefs to see if we have token
prefs = PreferenceManager.getDefaultSharedPreferences(this);
String token = prefs.getString("token", null);
String tokenSecret = prefs.getString("tokenSecret", null);
if (token != null && tokenSecret != null) {
// We have token, use it
mConsumer.setTokenWithSecret(token, tokenSecret);
// Make a Twitter object
oauthClient = new OAuthSignpostClient(OAUTH_KEY, OAUTH_SECRET,
token, tokenSecret);
twitter = new Twitter(TWITTER_USER, oauthClient);
}
}
/*
* Callback once we are done with the authorization of this app with
* Twitter.
*/
@Override
public void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.d(TAG, "intent: " + intent);
// Check if this is a callback from OAuth
Uri uri = intent.getData();
if (uri != null && uri.getScheme().equals(OAUTH_CALLBACK_SCHEME)) {
Log.d(TAG, "callback: " + uri.getPath());
String verifier = uri.getQueryParameter(OAuth.OAUTH_VERIFIER);
Log.d(TAG, "verifier: " + verifier);
new RetrieveAccessTokenTask().execute(verifier);
}
}
public void onClickAuthorize(View view) {
new OAuthAuthorizeTask().execute();
}
public void onClickTweet(View view) {
if (twitter == null) {
Toast.makeText(this, "Authenticate first", Toast.LENGTH_LONG)
.show();
return;
}
EditText status = (EditText) findViewById(R.id.status);
new PostStatusTask().execute(status.getText().toString());
}
public void onClickGetStatus(View view) {
if (twitter == null) {
Toast.makeText(this, "Authenticate first", Toast.LENGTH_LONG)
.show();
return;
}
new GetStatusTask().execute();
}
/* Responsible for starting the Twitter authorization */
class OAuthAuthorizeTask extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... params) {
String authUrl;
String message = null;
try {
authUrl = mProvider.retrieveRequestToken(mConsumer,
OAUTH_CALLBACK_URL);
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse(authUrl));
startActivity(intent);
} catch (OAuthMessageSignerException e) {
message = "OAuthMessageSignerException";
e.printStackTrace();
} catch (OAuthNotAuthorizedException e) {
message = "OAuthNotAuthorizedException";
e.printStackTrace();
} catch (OAuthExpectationFailedException e) {
message = "OAuthExpectationFailedException";
e.printStackTrace();
} catch (OAuthCommunicationException e) {
message = "OAuthCommunicationException";
e.printStackTrace();
}
return message;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (result != null) {
Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG)
.show();
}
}
}
/* Responsible for retrieving access tokens from twitter */
class RetrieveAccessTokenTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String message = null;
String verifier = params[0];
try {
// Get the token
Log.d(TAG, "mConsumer: " + mConsumer);
Log.d(TAG, "mProvider: " + mProvider);
mProvider.retrieveAccessToken(mConsumer, verifier);
String token = mConsumer.getToken();
String tokenSecret = mConsumer.getTokenSecret();
mConsumer.setTokenWithSecret(token, tokenSecret);
Log.d(TAG, String.format(
"verifier: %s, token: %s, tokenSecret: %s", verifier,
token, tokenSecret));
// Store token in prefs
prefs.edit().putString("token", token)
.putString("tokenSecret", tokenSecret).commit();
// Make a Twitter object
oauthClient = new OAuthSignpostClient(OAUTH_KEY, OAUTH_SECRET,
token, tokenSecret);
/* "NameTest" (any word) */
twitter = new Twitter("NameTest", oauthClient);
Log.d(TAG, "token: " + token);
} catch (OAuthMessageSignerException e) {
message = "OAuthMessageSignerException";
e.printStackTrace();
} catch (OAuthNotAuthorizedException e) {
message = "OAuthNotAuthorizedException";
e.printStackTrace();
} catch (OAuthExpectationFailedException e) {
message = "OAuthExpectationFailedException";
e.printStackTrace();
} catch (OAuthCommunicationException e) {
message = "OAuthCommunicationException";
e.printStackTrace();
}
return message;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (result != null) {
Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG)
.show();
}
}
}
/* Responsible for getting Twitter status */
class GetStatusTask extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... params) {
return twitter.getStatus().text;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
}
}
/* Responsible for posting new status to Twitter */
class PostStatusTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
try {
twitter.setStatus(params[0]);
return "Successfully posted: " + params[0];
} catch (TwitterException e) {
return "Error connecting to server.";
}
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
}
}
}
<强>的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.marakana.oauth"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="11" />
<uses-permission
android:name="android.permission.INTERNET" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:launchMode="singleInstance">
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<!-- Used for OAuth callback -->
<intent-filter>
<action
android:name="android.intent.action.VIEW" />
<category
android:name="android.intent.category.DEFAULT" />
<category
android:name="android.intent.category.BROWSABLE" />
<data
android:scheme="x-marakana-oauth-twitter"
android:host="callback" />
</intent-filter>
</activity>
</application>
</manifest>
<强> activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/app_name"
android:textSize="50sp"
android:gravity="center" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Authenticate"
android:onClick="onClickAuthorize"
android:textSize="40sp"></Button>
<EditText
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:id="@+id/status"
android:textSize="40sp"
android:hint="What's up?"></EditText>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tweet"
android:onClick="onClickTweet"
android:textSize="40sp"></Button>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Status"
android:textSize="40sp"
android:onClick="onClickGetStatus"></Button>
</LinearLayout>
答案 1 :(得分：0)
查看http://www.winterwell.com/software/jtwitter.php
代码示例的第一部分：获得授权