How to check your internet connection in Android?

Question

I want to check my internet connection at every event. If it is lost, a message should be displayed.

Can anyone advise me how to do this?

Answer 1

You can use the ConnectivityManager to check the status of the network.

ConnectivityManager conMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) { // notify user you are online } else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) { // notify user you are not online } 

Note that the ConnectivityManager.TYPE_MOBILE and ConnectivityManager.TYPE_WIFI constants represent connection types, and these two values ​​are not exhaustive. See here for an exhaustive list.

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Also make sure that you have the necessary permission to monitor the network status. You must add this permission to your AndroidManifest.xml:

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 

Answer 2

Only one connection can be active at any point. Therefore a simpler answer:

 final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo(); if (activeNetwork != null && activeNetwork.isConnected()) { // notify user you are online } else { // notify user you are not online } 

It is also suitable for any new type of network, such as ConnectivityManager # TYPE_WIMAX

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Also make sure that you have the necessary permission to monitor the network status. You must add this permission to your AndroidManifest.xml:

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 

Answer 3

This can be done for various types of network conditions.

 public void checkNetworkStatus(){ final ConnectivityManager connMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE); final android.net.NetworkInfo wifi = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); final android.net.NetworkInfo mobile = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if( wifi.isAvailable() ){ Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show(); } else if( mobile.isAvailable() ){ Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show(); } else { Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show(); } } 

Answer 4

You can directly check network availability and data availability for mobile and wi-fi using

For network availability ,

 private boolean isNetworkAvailable() { ConnectivityManager conxMgr = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE); NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); NetworkInfo wifiNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); return ((mobileNwInfo== null ? false : mobileNwInfo.isAvailable()) || (wifiNwInfo == null ? false : wifiNwInfo.isAvailable())); } 

For data availability if network is available

 private boolean isDataAvailable() { ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE); NetworkInfo wifiNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); return ((mobileNwInfo== null? false : mobileNwInfo.isConnected() )|| (wifiNwInfo == null? false : wifiNwInfo.isConnected())); } 

Answer 5

Correction

 if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED || conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING ) { //notify user you are online } 

it should be

 if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED || conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) { //notify user you are online } 

Answer 6

Register the broadcast receiver to the CONNECTIVITY_ACTION descriptor . See This Complete Example . You must update the static variable 'connectionAvailable', which will be available everywhere and every time through the appropriate recipient.

Remember to declare the broadcast receiver in the manifest file:

 <receiver android:name=".NetworkConnectivityReceiver" android:enabled="true"> <intent-filter> <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/> </intent-filter> </receiver> 

Regarding “checking every action,” you might be interested in using BaseActivity, enhanced by your actions , and managing the connection check and message display.

Also note that using events (not polling from actions) will be more efficient.

Answer 7

You are not using ConnectivityManager.getNetworkInfo(0).getState() and ConnectivityManager.getNetworkInfo(1).getState() correctly, instead of hardcoding, values ​​(1) and (0) use ConnectivityManager.TYPE_WIFI and ConnectivityManager.TYPE_MOBILE

Answer 8

This is a boolean check to see if you have network access. It does not determine what access to the network is mobile, Wi-Fi ..., it just checks if it is connected.

 boolean mobileNwInfo = false; ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); try { mobileNwInfo = conxMgr.getActiveNetworkInfo().isConnected(); } catch (NullPointerException e) { mobileNwInfo = false; } if ( mobileNwInfo == false ) { // Your code goes here... }