我不明白，为什么我的 Twitter 阅读在我运行纯 Java 应用程序时有效，而在从 android java 程序调用时无效。我希望有一个人可以帮助我。我使用 twitter 的 1.1 API 的 application-authentification 方法。
我在执行 Java 时使用了以下代码，这是有效的：
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import javax.net.ssl.HttpsURLConnection;
import org.apache.commons.codec.binary.Base64;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
public class testSomething {
private final static String getTokenURL = "https://api.twitter.com/oauth2/token";
private static String bearerToken;
public static final String CONSUMER_KEY = "<key>";
public static final String CONSUMER_SECRET= "<secret>";
/**
* @param args
*/
public static void main(String[] args) {
// encodeKeys(APIKEY, APISECRET);
new Thread(new Runnable() {
@Override
public void run() {
try {
bearerToken = requestBearerToken(getTokenURL);
System.out.println("Search = " + "https://api.twitter.com/1.1/search/tweets.json?q=%23PhuseKatja&count=20");
System.out.println("Bearer = " + bearerToken);
ArrayList<Tweet> tweets = fetchSearchTweet("https://api.twitter.com/1.1/search/tweets.json?q=%23PhuseKatja&count=20",
bearerToken);
System.out.println(tweets.size());
} catch (IOException e) {
System.out.println("IOException e");
e.printStackTrace();
}
}
}).start();
}
// Encodes the consumer key and secret to create the basic authorization key
private static String encodeKeys(String consumerKey, String consumerSecret) {
try {
String encodedConsumerKey = URLEncoder.encode(consumerKey, "UTF-8");
String encodedConsumerSecret = URLEncoder.encode(consumerSecret,
"UTF-8");
String fullKey = encodedConsumerKey + ":" + encodedConsumerSecret;
byte[] encodedBytes = Base64.encodeBase64(fullKey.getBytes());
return new String(encodedBytes);
} catch (UnsupportedEncodingException e) {
return new String();
}
}
// Constructs the request for requesting a bearer token and returns that
// token as a string
public static String requestBearerToken(String endPointUrl)
throws IOException {
HttpsURLConnection connection = null;
String encodedCredentials = encodeKeys(CONSUMER_KEY, CONSUMER_SECRET);
System.out.println("encodedCredentials "+encodedCredentials);
try {
URL url = new URL(endPointUrl);
connection = (HttpsURLConnection) url.openConnection();
System.out.println(connection);
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "Android Phuse Application");
connection.setRequestProperty("Authorization", "Basic " + encodedCredentials);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
connection.setRequestProperty("Content-Length", "29");
connection.setUseCaches(false);
writeRequest(connection, "grant_type=client_credentials");
// Parse the JSON response into a JSON mapped object to fetch fields
// from.
JSONObject obj = (JSONObject) JSONValue.parse(readResponse(connection));
if (obj != null) {
String tokenType = (String) obj.get("token_type");
String token = (String) obj.get("access_token");
return ((tokenType.equals("bearer")) && (token != null)) ? token
: "";
}
return new String();
} catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
// Fetches the first tweet from a given user's timeline
public static ArrayList<Tweet> fetchSearchTweet(String endPointUrl, String aBearerToken)
throws IOException {
HttpsURLConnection connection = null;
ArrayList<Tweet> tweets = new ArrayList<Tweet>();
try {
URL url = new URL(endPointUrl);
connection = (HttpsURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("GET");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "anyApplication");
connection.setRequestProperty("Authorization", "Bearer " + aBearerToken);
connection.setUseCaches(false);
String response = readResponse(connection);
System.out.println("Response = " + response);
System.out.println(connection.getResponseMessage());
System.out.println(connection.getResponseCode());
System.out.println("---------------------------------");
// Parse the JSON response into a JSON mapped object to fetch fields from.
JSONObject objSearch = (JSONObject) JSONValue.parse(response);
JSONArray ja = (JSONArray) objSearch.get("statuses");
if (ja != null) {
for (int i = 0; i < ja.size(); i++)
{
Tweet tweet = new Tweet((((JSONObject)((JSONObject) ja.get(i)).get("user")).get("screen_name").toString()),
((JSONObject) ja.get(i)).get("text").toString(),
(((JSONObject)((JSONObject) ja.get(i)).get("user")).get("profile_image_url").toString()));
tweets.add(tweet);
}
}
return tweets;
} catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
// Writes a request to a connection
private static boolean writeRequest(HttpURLConnection connection,
String textBody) {
try {
BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(
connection.getOutputStream()));
wr.write(textBody);
wr.flush();
wr.close();
return true;
} catch (IOException e) {
return false;
}
}
// Reads a response for a given connection and returns it as a string.
private static String readResponse(HttpURLConnection connection) {
try {
StringBuilder str = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String line = "";
while ((line = br.readLine()) != null) {
str.append(line + System.getProperty("line.separator"));
}
return str.toString();
} catch (IOException e) {
return new String();
}
}
public static class Tweet {
public String username;
public String message;
public String image_url;
//public Bitmap image_bitmap;
public Tweet(String username, String message, String url) {
this.username = username;
this.message = message;
this.image_url = url;
//this.image_bitmap = getBitmap(url);
}
}
}
当我创建 Android Java 应用程序（我最终需要它）时，我可以调用相同的代码但它不起作用。我的 fetchSearchTweet 请求确实收到了 400“错误响应”代码。BearerToken 已按预期收到，并且在打印令牌和搜索字符串时，都是一样的。
对于 Android，我创建了一个完整的新项目，激活 Internet 连接，复制相同的 testSomething 类并尝试运行它。但不幸的是，这不起作用（twitter 响应 400）。我没有线索。
import android.os.Bundle;
import android.os.StrictMode;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
String bearerToken = testSomething.requestBearerToken("https://api.twitter.com/oauth2/token");
testSomething.fetchSearchTweet("https://api.twitter.com/1.1/search/tweets.json?q=%23PhuseKatja&count=20", bearerToken);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
这在 Android-Java 中不起作用的原因在于纯 Java 和 Android Java 不同的“HttpsURLConnection”类。不知道新的 Twitter API 是否不支持 Android 提供的 HttpsURLConnection 或者 Android 的 HttpsURLConnection 是否不符合要求的格式。
我现在正在使用Twitter4J的快照版本，它也支持应用程序身份验证模式。