Added ForegroundDemo

Android/2021_05_13_AndroidClass-3/ForegroundDemo/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

Android/2021_05_13_AndroidClass-3/ForegroundDemo/README.md

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+# ForegroundDemo
+
+This Android App demonstrates how to make a Foreground Service.
+
+Visit: [https://github.com/CC-MNNIT/2021-22-Classes/tree/main/Android/2021_05_13_AndroidClass-3/ForegroundDemo/](https://github.com/CC-MNNIT/2021-22-Classes/tree/main/Android/2021_05_13_AndroidClass-3/ForegroundDemo/) for the source code.
+
+## Outcome:
+
+![Screenshot](ForegroundDemo.jpg)

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/.gitignore

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+/build

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 30
+    defaultConfig {
+        applicationId "com.wave.foregroundservice"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.core:core:1.3.2'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+}

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/src/androidTest/java/com/wave/foregroundservice/ExampleInstrumentedTest.java

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+package com.wave.foregroundservice;
+
+import android.content.Context;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.wave.foregroundservice", appContext.getPackageName());
+    }
+}

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.wave.foregroundservice">
+
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+    <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">
+        <service
+            android:name=".ForegroundService"
+            android:enabled="true"
+            android:exported="true"></service>
+
+        <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>

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/src/main/java/com/wave/foregroundservice/ForegroundService.java

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+package com.wave.foregroundservice;
+
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Intent;
+import android.os.Build;
+import android.os.IBinder;
+import androidx.annotation.Nullable;
+import androidx.core.app.NotificationCompat;
+
+public class ForegroundService extends Service {
+    public static final String CHANNEL_ID = "ForegroundServiceChannel";
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        String input = intent.getStringExtra("inputExtra");
+        createNotificationChannel();
+        Intent notificationIntent = new Intent(this, MainActivity.class);
+        PendingIntent pendingIntent = PendingIntent.getActivity(this,
+                0, notificationIntent, 0);
+
+        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
+                .setContentTitle("Foreground Service")
+                .setContentText(input)
+                .setSmallIcon(R.drawable.ic_stat_name)
+                .setContentIntent(pendingIntent)
+                .build();
+
+        startForeground(1, notification);
+
+        //do heavy work on a background thread
+
+
+        //stopSelf();
+
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+    }
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    private void createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationChannel serviceChannel = new NotificationChannel(
+                    CHANNEL_ID,
+                    "Foreground Service Channel",
+                    NotificationManager.IMPORTANCE_DEFAULT
+            );
+
+            NotificationManager manager = getSystemService(NotificationManager.class);
+            manager.createNotificationChannel(serviceChannel);
+        }
+    }
+}

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/src/main/java/com/wave/foregroundservice/MainActivity.java

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+package com.wave.foregroundservice;
+
+import android.content.Intent;
+import android.os.Bundle;
+import androidx.core.content.ContextCompat;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.view.View;
+import android.widget.Button;
+
+public class MainActivity extends AppCompatActivity {
+    Button btnStartService, btnStopService;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        btnStartService = findViewById(R.id.buttonStartService);
+        btnStopService = findViewById(R.id.buttonStopService);
+
+        btnStartService.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startService();
+            }
+        });
+
+        btnStopService.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                stopService();
+            }
+        });
+    }
+
+    public void startService() {
+        Intent serviceIntent = new Intent(this, ForegroundService.class);
+        serviceIntent.putExtra("inputExtra", "Foreground Service Example in Android");
+
+        ContextCompat.startForegroundService(this, serviceIntent);
+    }
+
+    public void stopService() {
+        Intent serviceIntent = new Intent(this, ForegroundService.class);
+        stopService(serviceIntent);
+    }
+}
+

Android/2021_05_13_AndroidClass-3/ForegroundDemo/app/src/main/res/drawable-anydpi-v24/ic_stat_name.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="#FFFFFF"
+    android:viewportWidth="26.086956"
+    android:viewportHeight="26.086956">
+    <group
+        android:translateX="1.0434783"
+        android:translateY="1.0434783">
+        <path
+            android:fillColor="#FF000000"
+            android:pathData="M12,23c1.1,0 1.99,-0.89 1.99,-1.99h-3.98c0,1.1 0.89,1.99 1.99,1.99zM20.29,18.29L19,17v-6c0,-3.35 -2.36,-6.15 -5.5,-6.83L13.5,3c0,-0.83 -0.67,-1.5 -1.5,-1.5s-1.5,0.67 -1.5,1.5v1.17C7.36,4.85 5,7.65 5,11v6l-1.29,1.29c-0.63,0.63 -0.19,1.71 0.7,1.71h15.17c0.9,0 1.34,-1.08 0.71,-1.71zM13,16h-2v-2h2v2zM13,11c0,0.55 -0.45,1 -1,1s-1,-0.45 -1,-1L11,9c0,-0.55 0.45,-1 1,-1s1,0.45 1,1v2z" />
+    </group>
+</vector>