Broadcast Receivers In Android Application

1. Android Detect Internet Connection Status Check Using  Broadcast Receivers:-

Broadcast Receivers

Broadcast Receivers following two important steps to make BroadcastReceiver works for the system broadcasted intents:−

1. Creating the Broadcast Receiver.
2. Registering Broadcast Receiver.

1. Now Project Start in  Detect Internet Connection Status Checks Using  Broadcast Receivers in Android.

1. Step (1):- Create a project in Android Studio from File ⇒ New Project.
2. Step (2):- Create a class named ConnectivityReceiverInternet.java and extend it from BroadcastReceiver. This is a receiver class that will be notified whenever there is a change in network/internet connection.

package info.thecodehub.checkinternet;

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

public class ConnectivityReceiverInternet
        extends BroadcastReceiver {

    public static ConnectivityReceiverListener connectivityReceiverListener;

    public ConnectivityReceiverInternet() {
        super();
    }

    @Override
    public void onReceive(Context context, Intent internet) {
        ConnectivityManager cm = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        boolean isConnected = activeNetwork != null
                && activeNetwork.isConnectedOrConnecting();

        if (connectivityReceiverListener != null) {
            connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
        }
    }

    public static boolean isConnected() {
        ConnectivityManager
                cm = (ConnectivityManager) MyApplication.getInstance().getApplicationContext()
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null
                && activeNetwork.isConnectedOrConnecting();
    }


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

}

 3.Step (3):- Create another class named MyApplication.java and extend it from Application. This class will be called whenever the app is launched. Here setConnectivityListener() method is used to initiate the connectivity listener.

package info.thecodehub.checkinternet;

import android.app.Application;


public class MyApplication extends Application {

    private static MyApplication mInstance;

    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }

    public static synchronized MyApplication getInstance() {
        return mInstance;
    }

    public void setConnectivityListener(ConnectivityReceiverInternet.ConnectivityReceiverListener listener) {
        ConnectivityReceiverInternet.connectivityReceiverListener = listener;
    }
}

4.Step (4):-  Open AndroidManifest.xml In the below changes.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="info.thecodehub.checkinternet">

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

    <application
        android:name="info.thecodehub.checkinternet.MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name="info.thecodehub.checkinternet.MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name="info.thecodehub.checkinternet.ConnectivityReceiverInternet"
            android:enabled="true">
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>

        <activity
            android:name="info.thecodehub.checkinternet.SecondActivity"
            android:label="@string/title_activity_second"
            android:parentActivityName="info.thecodehub.checkinternet.MainActivity"
            android:theme="@style/AppTheme.NoActionBar">
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="info.thecodehub.checkinternet.MainActivity" />
        </activity>
    </application>

</manifest>

5.Step (5):-Open layout file main activity activity_main.xml add the below layout in xml File.

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="info.thecodehub.checkinternet.MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </com.google.android.material.appbar.AppBarLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="@dimen/activity_vertical_margin"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Turn on/off wifi to notify the app about connection status." />

        <Button
            android:id="@+id/btn_check"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:text="Check Connection" />
    </LinearLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_add_white_24dp" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

6.Step(6):- MainActivity.java To  the below changes to receive the internet status.

package info.thecodehub.checkinternet;

import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
        implements ConnectivityReceiverInternet.ConnectivityReceiverListener {

    private FloatingActionButton fab;
    private Button btnCheck;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        btnCheck = (Button) findViewById(R.id.btn_check);
        fab = (FloatingActionButton) findViewById(R.id.fab);

        // Manually checking internet connection
        checkConnection();

        btnCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Manually checking internet connection
                checkConnection();
            }
        });

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, SecondActivity.class));
            }
        });
    }

    private void checkConnection() {
        boolean isConnected = ConnectivityReceiverInternet.isConnected();
        showSnack(isConnected);
    }

    private void showSnack(boolean isConnected) {
        String message;
        int color;
        if (isConnected) {
            message = "Good! Connected to Internet";
            color = Color.WHITE;
        } else {
            message = "Sorry! Not connected to internet";
            color = Color.RED;
        }

        Snackbar snackbar = Snackbar
                .make(findViewById(R.id.fab), message, Snackbar.LENGTH_LONG);

        View sbView = snackbar.getView();
        TextView textView = (TextView) sbView.findViewById(R.id.snackbar_text);
        textView.setTextColor(color);
        snackbar.show();
    }

    @Override
    protected void onResume() {
        super.onResume();

        // register connection status listener
        MyApplication.getInstance().setConnectivityListener(this);
    }

   
    @Override
    public void onNetworkConnectionChanged(boolean isConnected) {
        showSnack(isConnected);
    }
}

Code Resource:-https://github.com/Keyur88/Internet-Connection-Broadcast-Receiver.git

Now you can run your project.

Output:-

Congratulations!!! you have developed your Detect Internet Connection Status Check Using  Broadcast Receivers In Android Example Integration. in Android Studio and now just keep following the rest of the tutorial step by step to become a great Android Developer. All the very best.