Asynctask致命exception
我还是Android编程的新手。 我正在关注一本名为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{ @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
类似的例子对我有用，希望它有所帮助：
- 添加库：signpost（signpost-core-1.2.1.1.jar）
- 在Web上生成OAUTH_KEY和OAUTH_SECRET： https ：//dev.twitter.com/apps/
-
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：
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 { @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 { @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 { @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 { @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(); } } }
AndroidManifest.xml中
activity_main.xml中
看看http://www.winterwell.com/software/jtwitter.php
代码示例的第一部分：获得授权