Question

在我的Android 4.2.2模拟器中，我尝试使用scribe code snippet：

OAuthService service = new ServiceBuilder()
            .provider(TwitterApi.class)
            .apiKey("abc")
            .apiSecret("aaa123")
            .debug()
            .build();
    Scanner in = new Scanner(System.in);
    Token requestToken = service.getRequestToken();

在logcat中，我收到以下错误。我认为这可能是因为Scribe的这个示例代码不是异步任务。你能推荐一个异步的例子吗？

请注意，此代码段适用于Android 2.3.3。它在Android 4.2.2中不起作用。

    E/AndroidRuntime: FATAL EXCEPTION: main
    java.lang.RuntimeException: 
      Unable to start activity  
      ComponentInfo{com.myexample.android/com.myexample.android.MyActivity}: 
      org.scribe.exceptions.OAuthConnectionException:
      There was a problem while creating a connection to the remote service.
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    at android.app.ActivityThread.access$600(ActivityThread.java:141)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5039)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: org.scribe.exceptions.OAuthConnectionException: There was a problem while creating a connection to the remote service.
    at org.scribe.model.Request.send(Request.java:70)
    at org.scribe.oauth.OAuth10aServiceImpl.getRequestToken(OAuth10aServiceImpl.java:59)
    at org.scribe.oauth.OAuth10aServiceImpl.getRequestToken(OAuth10aServiceImpl.java:40)
    at org.scribe.oauth.OAuth10aServiceImpl.getRequestToken(OAuth10aServiceImpl.java:45)
    at com.myexample.android.MyActivity.onCreate(MyActivity.java:139)
    at android.app.Activity.performCreate(Activity.java:5104)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
    ... 11 more
    Caused by: android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
    at java.net.InetAddress.getAllByName(InetAddress.java:214)
    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
    at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:197)
    at org.scribe.model.Request.addBody(Request.java:136)
    at org.scribe.model.Request.doSend(Request.java:114)
    at org.scribe.model.Request.send(Request.java:66)
    ... 18 more

Answer 1

这是因为Android的更高版本现在要求网络连接发生在主线程之外。我之前使用过AsyncTask，但它在未来的Android版本中被删除了。

如果您需要返回结果并更新UI，我建议您使用AsyncTaskLoader。否则，您可以使用IntentService（或任何其他Service类型）。您也可以直接创建新的Thread。无论你决定什么，一旦你从主线程移开连接，你就不会再收到NetworkOnMainThreadException了！

Answer 2

在@ Jabari的回答之后，我也添加了我的答案。

是的，网络连接必须具有与UI线程不同的线程所以我发现loopj的库非常好您可以从中获得：http://loopj.com/android-async-http/

Android 4中的Scribe-java和异步请求

2 个答案: