Part 1 – Static BroadcastReceiver

[embedyt] https://www.youtube.com/watch?v=8FJ3oOpHszc[/embedyt]

In this video series we will learn everything about BroadcastReceivers in Android, with which we can listen to different system and application events. This way we can execute code when the device boots up, when the internet connectivity of the phone changes, when we receive an SMS and a lot more. We can also send our own broadcasts and schedule work for a time in the future.
In part 1 we will take a look at static, Manifest registered BroadcastReceivers, that will work even if the app itself is not running. By giving them an IntentFilter with an appropriate action string, we can have them listen to implicit broadcasts, like different system events. When these events happen, the onReceive method of our BroadcastReceiver will be called.
We will also learn about the background execution changes that have been made on Android Nougat and Oreo, which for example change the way we can listen to the CONNECTIVITY_CHANGE broadcast.

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ExampleBroadcastReceiver.javaAndroidManifest.xml

package com.codinginflow.broadcastexample;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.widget.Toast;

public class ExampleBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
            Toast.makeText(context, "Boot completed", Toast.LENGTH_SHORT).show();
        }

        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
            Toast.makeText(context, "Connectivity changed", Toast.LENGTH_SHORT).show();
        }
    }
}

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

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

    <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>
        <receiver android:name=".ExampleBroadcastReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            </intent-filter>
        </receiver>
    </application>

</manifest>