boolean b_IsConnect = isNetworkAvailable();
private boolean isNetworkAvailable() {
  ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  NetworkInfo activeNetworkInfo = connectivityManager
    .getActiveNetworkInfo();
  return activeNetworkInfo != null;
}

我还在清单中添加了所需的权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

但它仍然抛出异常：

05-02 16:05:26.226: E/AndroidRuntime(481): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.housedisplay/com.housedisplay.RSSActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10038 nor current process has android.permission.ACCESS_NETWORK_STATE.
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.access$1500(ActivityThread.java:123)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.os.Looper.loop(Looper.java:126)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.main(ActivityThread.java:3997)
05-02 16:05:26.226: E/AndroidRuntime(481):  at java.lang.reflect.Method.invokeNative(Native Method)
05-02 16:05:26.226: E/AndroidRuntime(481):  at java.lang.reflect.Method.invoke(Method.java:491)
05-02 16:05:26.226: E/AndroidRuntime(481):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-02 16:05:26.226: E/AndroidRuntime(481):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-02 16:05:26.226: E/AndroidRuntime(481):  at dalvik.system.NativeStart.main(Native Method)
05-02 16:05:26.226: E/AndroidRuntime(481): Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10038 nor current process has android.permission.ACCESS_NETWORK_STATE.
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.os.Parcel.readException(Parcel.java:1322)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.os.Parcel.readException(Parcel.java:1276)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.net.IConnectivityManager$Stub$Proxy.getActiveNetworkInfo(IConnectivityManager.java:446)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.net.ConnectivityManager.getActiveNetworkInfo(ConnectivityManager.java:256)
05-02 16:05:26.226: E/AndroidRuntime(481):  at com.housedisplay.RSSActivity.isNetworkAvailable(RSSActivity.java:218)
05-02 16:05:26.226: E/AndroidRuntime(481):  at com.housedisplay.RSSActivity.onCreate(RSSActivity.java:59)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)

你能告诉我这里发生了什么吗？