小编Sey*_*rth的帖子

您好,我正面临这个问题:我正在使用兼容包在Android应用程序中使用片段(min SDK 2.1).

片段有时会发生随机异常,我无法弄清楚原因.这是我收到的堆栈跟踪:

java.lang.IllegalStateException: Fragment FeedListFragment{438a54e8} not attached to Activity
    at android.support.v4.app.Fragment.getLoaderManager(Fragment.java:715)
    at com.myappli.ui.FeedListFragment.refreshUpdateDate(FeedListFragment.java:283)
    at com.myappli.ui.phone.FeedListActivity.onReceiveResult(FeedListActivity.java:277)
    at com.myappli.data.rssplayer.service.KTDetachableResultReceiver.onReceiveResult(KTDetachableResultReceiver.java:55)
    at android.os.ResultReceiver$MyRunnable.run(ResultReceiver.java:43)
    at android.os.Handler.handleCallback(Handler.java:587)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:4425)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:521)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
    at dalvik.system.NativeStart.main(Native Method)

这是我在Fragment类中调用的相应代码:

public class FeedListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor>, FeedListCursorAdapterListener {

...
    public void refreshUpdateDate() {
    getLoaderManager().restartLoader(LAST_UPDATE_CURSOR_ID, null, this);
    }
...
}

以下是调用片段的活动的代码:

private FeedListFragment mCursorLoaderListFg;

if (!isFinishing()) {
    mCursorLoaderListFg.refreshUpdateDate();
    mCursorLoaderListFg.refreshDisplay();
    mCursorLoaderListFg.hideLoadingArticles();
}

这是getLoaderManager()的片段源代码:

/**
* Return the LoaderManager for …

我在ICS上测试我的应用程序时遇到了一个奇怪的问题.

在Android 2.X上使用以下代码效果很好(有时会发生超时但很少次):

    HttpParams httpParameters = new BasicHttpParams();
    HttpConnectionParams.setConnectionTimeout(httpParameters, CONNECTION_TIMEOUT);
    HttpConnectionParams.setSoTimeout(httpParameters, SOCKET_TIMEOUT);

    final DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);

    // Create a new HttpClient and Post Header
    HttpPost httpPost = new HttpPost(url);

    HttpResponse response = null;
    try {
        if (keys != null) {
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
        }

        // Cookies
        // Create a local instance of cookie store
        if (checkCookieValues()) {
            BasicClientCookie cookieSession = new BasicClientCookie(mCookieName, mCookieValue);
            cookieSession.setDomain(mCookieDomain);
            httpClient.getCookieStore().clear();
            httpClient.getCookieStore().addCookie(cookieSession);
        }

        // Execute HTTP Post Request
        response = httpClient.execute(httpPost);

        httpClient.getConnectionManager().shutdown();

    } catch …