创建集成Twitter的应用程序。我使用本教程：
http://blog.blundell-apps.com/sending-a-tweet/
package com.blundell.tut.ttt;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.Toast;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.auth.RequestToken;
public class TweetToTwitterActivity extends Activity {
private static final String TAG = "Blundell.TweetToTwitterActivity";
/** Name to store the users access token */
private static final String PREF_ACCESS_TOKEN = "accessToken";
/** Name to store the users access token secret */
private static final String PREF_ACCESS_TOKEN_SECRET = "accessTokenSecret";
/** Consumer Key generated when you registered your app at https://dev.twitter.com/apps/ */
private static final String CONSUMER_KEY = "yourConsumerKey";
/** Consumer Secret generated when you registered your app at https://dev.twitter.com/apps/ */
private static final String CONSUMER_SECRET = "yourConsumerSecret"; // XXX Encode in your app
/** The url that Twitter will redirect to after a user log's in - this will be picked up by your app manifest and redirected into this activity */
private static final String CALLBACK_URL = "tweet-to-twitter-blundell-01-android:///";
/** Preferences to store a logged in users credentials */
private SharedPreferences mPrefs;
/** Twitter4j object */
private Twitter mTwitter;
/** The request token signifies the unique ID of the request you are sending to twitter */
private RequestToken mReqToken;
private Button mLoginButton;
private Button mTweetButton;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(TAG, "Loading TweetToTwitterActivity");
setContentView(R.layout.activity_main);
// Create a new shared preference object to remember if the user has
// already given us permission
mPrefs = getSharedPreferences("twitterPrefs", MODE_PRIVATE);
Log.i(TAG, "Got Preferences");
// Load the twitter4j helper
mTwitter = new TwitterFactory().getInstance();
Log.i(TAG, "Got Twitter4j");
// Tell twitter4j that we want to use it with our app
mTwitter.setOAuthConsumer(CONSUMER_KEY, CONSUMER_SECRET);
Log.i(TAG, "Inflated Twitter4j");
mLoginButton = (Button) findViewById(R.id.login_button);
mTweetButton = (Button) findViewById(R.id.tweet_button);
}
/**
* Button clickables are declared in XML as this projects min SDK is 1.6</br> </br>
* Checks if the user has given this app permission to use twitter
* before</br> If so login and enable tweeting</br>
* Otherwise redirect to Twitter for permission
*
* @param v the clicked button
*/
public void buttonLogin(View v) {
Log.i(TAG, "Login Pressed");
if (mPrefs.contains(PREF_ACCESS_TOKEN)) {
Log.i(TAG, "Repeat User");
loginAuthorisedUser();
} else {
Log.i(TAG, "New User");
loginNewUser();
}
}
/**
* Button clickables are declared in XML as this projects min SDK is 1.6</br> </br>
*
* @param v the clicked button
*/
public void buttonTweet(View v) {
Log.i(TAG, "Tweet Pressed");
tweetMessage();
}
/**
* Create a request that is sent to Twitter asking 'can our app have permission to use Twitter for this user'</br>
* We are given back the {@link mReqToken}
* that is a unique indetifier to this request</br>
* The browser then pops up on the twitter website and the user logins in ( we never see this informaton
* )</br> Twitter then redirects us to {@link CALLBACK_URL} if the login was a success</br>
*
*/
private void loginNewUser() {
try {
Log.i(TAG, "Request App Authentication");
mReqToken = mTwitter.getOAuthRequestToken(CALLBACK_URL);
Log.i(TAG, "Starting Webview to login to twitter");
WebView twitterSite = new WebView(this);
twitterSite.loadUrl(mReqToken.getAuthenticationURL());
setContentView(twitterSite);
} catch (TwitterException e) {
Toast.makeText(this, "Twitter Login error, try again later", Toast.LENGTH_SHORT).show();
}
}
/**
* The user had previously given our app permission to use Twitter</br>
* Therefore we retrieve these credentials and fill out the Twitter4j helper
*/
private void loginAuthorisedUser() {
String token = mPrefs.getString(PREF_ACCESS_TOKEN, null);
String secret = mPrefs.getString(PREF_ACCESS_TOKEN_SECRET, null);
// Create the twitter access token from the credentials we got previously
AccessToken at = new AccessToken(token, secret);
mTwitter.setOAuthAccessToken(at);
Toast.makeText(this, "Welcome back", Toast.LENGTH_SHORT).show();
enableTweetButton();
}
/**
* Catch when Twitter redirects back to our {@link CALLBACK_URL}</br>
* We use onNewIntent as in our manifest we have singleInstance="true" if we did not the
* getOAuthAccessToken() call would fail
*/
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.i(TAG, "New Intent Arrived");
dealWithTwitterResponse(intent);
}
@Override
protected void onResume() {
super.onResume();
Log.i(TAG, "Arrived at onResume");
}
/**
* Twitter has sent us back into our app</br>
* Within the intent it set back we have a 'key' we can use to authenticate the user
*
* @param intent
*/
private void dealWithTwitterResponse(Intent intent) {
Uri uri = intent.getData();
if (uri != null && uri.toString().startsWith(CALLBACK_URL)) { // If the user has just logged in
String oauthVerifier = uri.getQueryParameter("oauth_verifier");
authoriseNewUser(oauthVerifier);
}
}
/**
* Create an access token for this new user</br>
* Fill out the Twitter4j helper</br>
* And save these credentials so we can log the user straight in next time
*
* @param oauthVerifier
*/
private void authoriseNewUser(String oauthVerifier) {
try {
AccessToken at = mTwitter.getOAuthAccessToken(mReqToken, oauthVerifier);
mTwitter.setOAuthAccessToken(at);
saveAccessToken(at);
// Set the content view back after we changed to a webview
setContentView(R.layout.activity_main);
enableTweetButton();
} catch (TwitterException e) {
Toast.makeText(this, "Twitter auth error x01, try again later", Toast.LENGTH_SHORT).show();
}
}
/**
* Allow the user to Tweet
*/
private void enableTweetButton() {
Log.i(TAG, "User logged in - allowing to tweet");
mLoginButton.setEnabled(false);
mTweetButton.setEnabled(true);
}
/**
* Send a tweet on your timeline, with a Toast msg for success or failure
*/
private void tweetMessage() {
try {
mTwitter.updateStatus("Test - Tweeting with @Blundell_apps #AndroidDev Tutorial using #Twitter4j http://blog.blundell-apps.com/sending-a-tweet/");
Toast.makeText(this, "Tweet Successful!", Toast.LENGTH_SHORT).show();
} catch (TwitterException e) {
Toast.makeText(this, "Tweet error, try again later", Toast.LENGTH_SHORT).show();
}
}
private void saveAccessToken(AccessToken at) {
String token = at.getToken();
String secret = at.getTokenSecret();
Editor editor = mPrefs.edit();
editor.putString(PREF_ACCESS_TOKEN, token);
editor.putString(PREF_ACCESS_TOKEN_SECRET, secret);
editor.commit();
}
}
这里用onNewIntent（）方法编写的代码不起作用我设置setcontentView只是一个问题吗？
这是清单
<application
android:icon="@drawable/icon"
android:label="@string/app_name">
<activity
android:name=".TweetToTwitterActivity"
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>
<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="tweet-to-twitter-blundell-01-android" />
</intent-filter>
</activity>
</application>
答案 0 :(得分：4)
在清单中更改您的活动启动模式，如下所示，让我知道结果，
android:launchMode="singleTop"
答案 1 :(得分：1)
android:launchMode="singleInstance"为我工作。
我必须确保将这两个用于启动意图的当前活动，以及即将从意图开始的活动，在AndroidManifest.xml内。