How to monitor Network connections status in Android?

This example demonstrates how do I monitor Network connections status in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity">
   <ImageView
      android:id="@+id/ivConStatus"
      android:layout_width="150dp"
      android:layout_height="150dp"
      android:layout_centerInParent="true"
      android:layout_marginTop="24sp"
      android:scaleType="fitCenter"
      android:contentDescription="@string/todo" />
   <TextView
      android:id="@+id/tvConStatus"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textStyle="bold"
      android:textSize="24sp"
      android:layout_centerHorizontal="true"
      android:padding="4dp" />
   <Button
      android:id="@+id/btnCheckNetwork"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_alignParentBottom="true"
      android:text="Check Network"/>
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   ImageView ivConStatus;
   TextView tvconStatus;
   Button btnCheckNetwork;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      ivConStatus = findViewById(R.id.ivConStatus);
      tvconStatus = findViewById(R.id.tvConStatus);
      btnCheckNetwork = findViewById(R.id.btnCheckNetwork);
      btnCheckNetwork.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            checkNetworkConnectionStatus();
         }
      });
   }
   private void checkNetworkConnectionStatus() {
      boolean wifiConnected;
      boolean mobileDataConnected;
      ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo networkInfo = cm.getActiveNetworkInfo();
      if (networkInfo!=null && networkInfo.isConnected()){
         wifiConnected = networkInfo.getType() == ConnectivityManager.TYPE_WIFI;
         mobileDataConnected = networkInfo.getType() == ConnectivityManager.TYPE_MOBILE;
         if (wifiConnected){
            ivConStatus.setImageResource(R.drawable.ic_wifi);
            tvconStatus.setText("WIFI is Connected");
         } else if (mobileDataConnected){
            ivConStatus.setImageResource(R.drawable.ic_mobiledata);
            tvconStatus.setText("Mobile data is Connected");
         }
      } else {
         ivConStatus.setImageResource(R.drawable.ic_dnd);
         tvconStatus.setText("No Connections are available");
      }
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample">
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code.