CHECK INTERNET AVAILABILITY AND NOTIFY WHEN AVAILABLE IN ANDROID

If you want to develop an android application that will fetch information from internet, its better to check first if there is any internet connection available or not to handle exceptions.

You may also want to check when internet connection available to perform task or what type of connection is available (like WiFi or Mobile Data).

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• First of all add permission in AndroidManifest.xml

Internet Permission 

<uses-permission android:name="android.permission.INTERNET" />
Network State Permission 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

• Create a new java file Network.java  and write down the following code:

Network.java import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; public class Network {       private int NOT_CONNECTED = -1;       private int MOBILE = 0;       private int WIFI = 1;       private Context context;       public Network(Context context) {             this.context = context;       }       public boolean isInternetAvailable() {             ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);             if (cm != null) {                   NetworkInfo[] ni = cm.getAllNetworkInfo();                   if (ni != null) {                         for (int i = 0; i < ni.length; i++) {                               if (ni[i].getState() == NetworkInfo.State.CONNECTED) {                                     return true;                               }                         }                   }             }             return false;       }       public int getConnectionType() {             ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);             if (cm != null) {                   NetworkInfo ni = cm.getActiveNetworkInfo();                   if (null != ni) {                         if (ni.getType() == ConnectivityManager.TYPE_MOBILE)                               return MOBILE;                         if (ni.getType() == ConnectivityManager.TYPE_WIFI)                               return WIFI;                   }             }             return NOT_CONNECTED;       }       public String getConnectionString() {             int type = getConnectionType();             String status = null;             if (type == MOBILE) {                   status = "Mobile data enabled";             } else if (type == WIFI) {                   status = "Wifi enabled";             } else if (type == NOT_CONNECTED) {                   status = "Not connected to Internet";             }             return status;       } }

• For checking any type of internet connection available or not on device use:

Network net = new Network(getApplicationContext()); net.isInternetAvailable();

• For checking what type of internet connection is available on device use:

Network network = new Network(context); String status = network.getConnectionString();

• Use Broadcast receiver to check Network state, which will notify which network is available.
• Create New java file NetworkStatusChangeReceiver.java and write down following code:

NetworkStatusChangeReceiver.java import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.widget.TextView; import android.widget.Toast; public class NetworkStatusChangeReceiver extends BroadcastReceiver {     @Override     public void onReceive(final Context context, final Intent intent) {       Network network = new Network(context);         String status = network.getConnectionString();         showToast(context,status);     }           //Custom toast message       private void showToast(Context context, String status) {         LayoutInflater mInflater = LayoutInflater.from(context);         View myView = mInflater.inflate(R.layout.custom_toast, null);         TextView text = (TextView) myView.findViewById(R.id.text);         text.setText(status);         Toast toast = new Toast(context);         toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);         toast.setDuration(Toast.LENGTH_SHORT);         toast.setView(myView);         toast.show();       } }

• Register BroadcastReceiver in AndroidManifest.xml

AndroidManifest.xml <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.tutorialsface.networkstatus"     android:versionCode="1"     android:versionName="1.0" >     <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="19" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />     <application         android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity android:name="com.tutorialsface.networkstatus.MainActivity" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>         <receiver android:name=".NetworkStatusChangeReceiver" >             <intent-filter>                 <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />                 <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />             </intent-filter>         </receiver>     </application> </manifest>

• Custom Toast xml

custom_toast.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/toast_layout_root"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@drawable/rounded_rect"     android:orientation="vertical" >     <TextView         android:id="@+id/text"         android:layout_width="wrap_content"         android:layout_height="fill_parent"         android:padding="10dp"         android:textColor="#FFF" /> </LinearLayout>

• Make rounded_rect.xml file in drawable folder as toast background.

rounded_rect.xml <?xml version="1.0" encoding="UTF-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"     android:shape="rectangle" >     <gradient         android:angle="360"         android:centerColor="#FF0000"         android:endColor="#FF0000"         android:startColor="#FF0000" />     <corners         android:bottomLeftRadius="10dp"         android:bottomRightRadius="10dp"         android:topLeftRadius="10dp"         android:topRightRadius="10dp" /> </shape>

• Create MainActivity.java

MainActivity.java import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity {       Button buttonCheck;       TextView textStatus;       Network net;       @Override       protected void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.activity_main);             init();       }       private void init() {             getViews();             setListeners();             net = new Network(getApplicationContext());       }       private void setListeners() {             buttonCheck.setOnClickListener(new OnClickListener() {                   @Override                   public void onClick(View v) {                         if(net.isInternetAvailable()){                               textStatus.setText("Connected to Internet");                               textStatus.setTextColor(Color.GREEN);                         }else{                               textStatus.setText("Not connected to Internet");                               textStatus.setTextColor(Color.RED);                         }                   }             });       }       private void getViews() {             buttonCheck = (Button) findViewById(R.id.buttonCheck);             textStatus = (TextView) findViewById(R.id.textStatus);       } }

• Create activity_main.xml

activity_main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >     <Button         android:id="@+id/buttonCheck"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal"         android:text="Get Internet status" />     <TextView         android:id="@+id/textStatus"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center"         android:layout_marginTop="50dp"         android:textSize="25dp" /> </LinearLayout>

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