Auto Network detect using Broadcast receiver

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When using application suddenly if the network is OFF or ON we can detect using the broadcast receiver.

Please refer below code for that

step1: Create one class that extends as an application like below

TestApp.Java

package com.androindian.raj.test;

import android.app.Application;
import android.content.IntentFilter;
import android.net.ConnectivityManager;

public class TestApp extends Application{
    NetworkConnectivity listner;
    private static TestApp mInstance;
    IntentFilter filter;
    private boolean isregistered;
    @Override
    public void onCreate() {
        super.onCreate();
        mInstance=this;
        filter=new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        listner=new NetworkConnectivity();


    }

    public void setConnectivityListener(NetworkConnectivity.ConnectivityReceiverListener listener) {
        NetworkConnectivity.connectivityReceiverListener = listener;
        registerReceiver(listner,filter);
        isregistered=true;
    }
    public void resetConnectivityListener(NetworkConnectivity.ConnectivityReceiverListener listener){
        if (isregistered) {
            isregistered=false;
            NetworkConnectivity.connectivityReceiverListener = null;
            unregisterReceiver(listner);
        }
    }

    public static TestApp getInstance() {
        return mInstance;
    }


}

package com.androindian.raj.test;

import android.app.Application;

import android.content.IntentFilter;

import android.net.ConnectivityManager;

public class TestApp extends Application{

NetworkConnectivity listner;

private static TestApp mInstance;

IntentFilter filter;

private boolean isregistered;

@Override

public void onCreate() {

super.onCreate();

mInstance=this;

filter=new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);

listner=new NetworkConnectivity();

}

public void setConnectivityListener(NetworkConnectivity.ConnectivityReceiverListener listener) {

NetworkConnectivity.connectivityReceiverListener = listener;

registerReceiver(listner,filter);

isregistered=true;

}

public void resetConnectivityListener(NetworkConnectivity.ConnectivityReceiverListener listener){

if (isregistered) {

isregistered=false;

NetworkConnectivity.connectivityReceiverListener = null;

unregisterReceiver(listner);

}

public static TestApp getInstance() {

return mInstance;

}

Step2:

Add that class name in the manifest file within Application tag like below

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androindian.raj.test">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
       <strong><span style="color: #ff6600;"> android:name="TestApp"</span></strong>
        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>

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.androindian.raj.test">

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

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

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

<strong><span style="color: #ff6600;"> android:name="TestApp"</span></strong>

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/AppTheme">

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Step3:

Create one more class on name of NetworkConnectvity.Java that extends as a broadcast receiver

package com.androindian.raj.test;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkInfo;

class NetworkConnectivity extends BroadcastReceiver {
    public static ConnectivityReceiverListener connectivityReceiverListener;
    @Override
    public void onReceive(Context context, Intent intent) {
        boolean isConnected=isnetworkok();
        if (connectivityReceiverListener != null) {
            connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
        }
    }

    public  boolean isnetworkok(){
        ConnectivityManager manager= (ConnectivityManager) TestApp.getInstance().getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        if (manager!=null){
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
                Network[] network = manager.getAllNetworks();
                NetworkInfo info=manager.getActiveNetworkInfo();
                if (info!=null&&info.isConnectedOrConnecting()){
                    return true;
                }
               /* if (network.length >= 0) {
                    for (Network mntework : network) {
                        info = manager.getNetworkInfo(mntework);
                        if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
                            return true;
                        }
                    }
                }*/
            }else {
                NetworkInfo[] networkInfos = manager.getAllNetworkInfo();
                if (networkInfos != null) {
                    for (NetworkInfo info : networkInfos) {
                        if (info.getState() == NetworkInfo.State.CONNECTED) {
                            return true;
                        }
                    }
                }
            }
        }
        return false;
    }

    public interface ConnectivityReceiverListener {
        void onNetworkConnectionChanged(boolean isConnected);
    }
}

package com.androindian.raj.test;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.net.ConnectivityManager;

import android.net.Network;

import android.net.NetworkInfo;

class NetworkConnectivity extends BroadcastReceiver {

public static ConnectivityReceiverListener connectivityReceiverListener;

@Override

public void onReceive(Context context, Intent intent) {

boolean isConnected=isnetworkok();

if (connectivityReceiverListener != null) {

connectivityReceiverListener.onNetworkConnectionChanged(isConnected);

}

public boolean isnetworkok(){

ConnectivityManager manager= (ConnectivityManager) TestApp.getInstance().getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);

if (manager!=null){

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {

Network[] network = manager.getAllNetworks();

NetworkInfo info=manager.getActiveNetworkInfo();

if (info!=null&&info.isConnectedOrConnecting()){

return true;

}

/* if (network.length >= 0) {

for (Network mntework : network) {

info = manager.getNetworkInfo(mntework);

if (info.getState().equals(NetworkInfo.State.CONNECTED)) {

return true;

}

}*/

}else {

NetworkInfo[] networkInfos = manager.getAllNetworkInfo();

if (networkInfos != null) {

for (NetworkInfo info : networkInfos) {

if (info.getState() == NetworkInfo.State.CONNECTED) {

return true;

}

return false;

}

public interface ConnectivityReceiverListener {

void onNetworkConnectionChanged(boolean isConnected);

}

Step4:

Finally which class you want to check internet automatically add like below

package com.androindian.raj.test;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
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.Toast;

public class MainActivity extends AppCompatActivity implements NetworkConnectivity.ConnectivityReceiverListener {
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
             
    }

    @Override
 protected void onStart() {
 super.onStart();
 TestApp.getInstance().setConnectivityListener(this);
 }

 @Override
 protected void onPause() {
 TestApp.getInstance().resetConnectivityListener(null);
 super.onPause();
 }

 @Override
 public void onNetworkConnectionChanged(boolean isConnected) {
 if(isConnected){
 Toast.makeText(getApplicationContext(),
 "Net is there", Toast.LENGTH_LONG).show();
 }else {
 Toast.makeText(getApplicationContext(),
 "Net is not there", Toast.LENGTH_LONG).show();
 }

 }
}

package com.androindian.raj.test;

import android.content.Context;

import android.net.ConnectivityManager;

import android.net.Network;

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.Toast;

public class MainActivity extends AppCompatActivity implements NetworkConnectivity.ConnectivityReceiverListener {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

@Override

protected void onStart() {

super.onStart();

TestApp.getInstance().setConnectivityListener(this);

}

@Override

protected void onPause() {

TestApp.getInstance().resetConnectivityListener(null);

super.onPause();

}

@Override

public void onNetworkConnectionChanged(boolean isConnected) {

if(isConnected){

Toast.makeText(getApplicationContext(),

"Net is there", Toast.LENGTH_LONG).show();

}else {

Toast.makeText(getApplicationContext(),

"Net is not there", Toast.LENGTH_LONG).show();

}

APPS in Play Store

Auto Network detect using Broadcast receiver

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