Android Detect Internet Connection Status

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It is better to check internet connectivity status before making any HTTP Requests to avoid http exceptions. This tutorial will explain how to detect internet connection status in your applications.

Create new Project

1. Create a new project in Eclipse IDE by filling required details. File ⇒ New ⇒ Android Project
2. After creating new project first step is to add required permission in your AndroidManifest.xml file.
To access internet we need INTERNET Permission
To detect network status we need ACCESS_NETWORK_STATE Permission

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.detectinternetconnection"     android:versionCode="1"     android:versionName="1.0" >       <uses-sdk android:minSdkVersion="8" />       <application         android:icon="@drawable/ic_launcher"         android:label="@string/app_name" >         <activity             android:name=".AndroidDetectInternetConnectionActivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                   <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>       <!-- Internet Permissions -->     <uses-permission android:name="android.permission.INTERNET" />       <!-- Network State Permissions -->     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />   </manifest>

3. Create a new Class file and name it as ConnectionDetector.java and type the following code.

ConnectionDetector.java

package com.example.detectinternetconnection;   import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo;   public class ConnectionDetector {       private Context _context;       public ConnectionDetector(Context context){         this._context = context;     }       public boolean isConnectingToInternet(){         ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);           if (connectivity != null)           {               NetworkInfo[] info = connectivity.getAllNetworkInfo();               if (info != null)                   for (int i = 0; i < info.length; i++)                       if (info[i].getState() == NetworkInfo.State.CONNECTED)                       {                           return true;                       }             }           return false;     } }

4. When ever you want to check Internet Status in your application call isConnectingToInternet() function and it will return true or false

ConnectionDetector cd = new ConnectionDetector(getApplicationContext());   Boolean isInternetPresent = cd.isConnectingToInternet(); // true or false

5. In this tutorial for testing purpose i placed a simple button. Once you press the button it will show appropriate alert message about internet connection status.
6. Open your main.xml under res/layout folder and create a button.

main.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >       <TextView         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="Detect Internet Status" />       <Button android:id="@+id/btn_check"         android:layout_height="wrap_content"         android:layout_width="wrap_content"         android:text="Check Internet Status"         android:layout_centerInParent="true"/>   </RelativeLayout>

7. Finally open your MainActivity file and paste the following code. In the following code i showed an alert dialog with respected internet status message.

package com.example.detectinternetconnection;   import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button;   public class AndroidDetectInternetConnectionActivity extends Activity {       // flag for Internet connection status     Boolean isInternetPresent = false;       // Connection detector class     ConnectionDetector cd;       @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);           Button btnStatus = (Button) findViewById(R.id.btn_check);           // creating connection detector class instance         cd = new ConnectionDetector(getApplicationContext());           /**          * Check Internet status button click event          * */         btnStatus.setOnClickListener(new View.OnClickListener() {               @Override             public void onClick(View v) {                   // get Internet status                 isInternetPresent = cd.isConnectingToInternet();                   // check for Internet status                 if (isInternetPresent) {                     // Internet Connection is Present                     // make HTTP requests                     showAlertDialog(AndroidDetectInternetConnectionActivity.this, "Internet Connection",                             "You have internet connection", true);                 } else {                     // Internet connection is not present                     // Ask user to connect to Internet                     showAlertDialog(AndroidDetectInternetConnectionActivity.this, "No Internet Connection",                             "You don't have internet connection.", false);                 }             }           });       }       /**      * Function to display simple Alert Dialog      * @param context - application context      * @param title - alert dialog title      * @param message - alert message      * @param status - success/failure (used to set icon)      * */     public void showAlertDialog(Context context, String title, String message, Boolean status) {         AlertDialog alertDialog = new AlertDialog.Builder(context).create();           // Setting Dialog Title         alertDialog.setTitle(title);           // Setting Dialog Message         alertDialog.setMessage(message);           // Setting alert dialog icon         alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);           // Setting OK Button         alertDialog.setButton("OK", new DialogInterface.OnClickListener() {             public void onClick(DialogInterface dialog, int which) {             }         });           // Showing Alert Message         alertDialog.show();     } }

Run and test your application. For the above you will be getting following outputs.