Checking your internet connection on Android

Question

I need to check if the Internet is available or not in Android, so I tried using the following function:

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

And I also added the necessary permissions in the manifest:

 <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"/> 

But it still throws exceptions:

 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) 

Can you tell me what is going on here?

Answer 1

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" > slash is missing. There may be a problem with XML parsing, which can lead to incorrect parsing of the following <uses-permission ...> .

Answer 2

You need to set permission outside of your application tag in Manifest.xml

And how it should work:

 private boolean connectionChecker() { // ConnectivityManager casten connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); // boolean für networkinfo holen activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); // Returnt true oder false if not null return activeNetworkInfo != null; } 

Answer 3

try it,

 private void checkNetworkState() { // TODO Auto-generated method stub ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager .getActiveNetworkInfo(); if (activeNetworkInfo == null) { Toast.makeText(this, "Network Not Connected...Please Try Again", Toast.LENGTH_LONG).show(); } else { if (activeNetworkInfo.isConnected()) { try { << Your Task>>> } catch (Exception e) { // TODO Auto-generated catch block System.out.println("Inside the Exception" + e.getMessage()); } } else if (activeNetworkInfo.isConnectedOrConnecting()) { Toast.makeText(this, "Network is connecting Now please patient", Toast.LENGTH_LONG).show(); } } } 

Add this permission to the manifest <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> (mark the permission tag above the application tag)

Answer 4

Try this code

 public boolean isNetworkOnline() { boolean status=false; try{ ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getNetworkInfo(0); if (netInfo != null && netInfo.getState()==NetworkInfo.State.CONNECTED) { status= true; }else { netInfo = cm.getNetworkInfo(1); if(netInfo!=null && netInfo.getState()==NetworkInfo.State.CONNECTED) status= true; } }catch(Exception e){ e.printStackTrace(); return false; } return status; } 

Answer 5

 NetworkInfo i = conMgr.getActiveNetworkInfo(); if (i == null) return false; if (!i.isConnected()) return false; if (!i.isAvailable()) return false; return true; 

Answer 6

you just need to place permission above your application. Tag in the manifest of Andriod