Allow for host app data to be backed up

FuturaeDemo/app/build.gradle

 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 29
@@ -6,9 +7,9 @@ android {
 
     defaultConfig {
         applicationId "com.futurae.futuraedemo"
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 29
-        versionCode 5
+        versionCode 6
         versionName "1.0.0"
         resConfigs "en", "el"
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
@@ -46,7 +47,10 @@ repositories {
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
 
-    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+
+    implementation "androidx.core:core-ktx:1.6.0"
+    implementation 'androidx.appcompat:appcompat:1.3.1'
     implementation 'com.google.android.gms:play-services-vision:20.1.3'
     implementation 'com.jakewharton:butterknife:10.2.3'
     annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.3'
@@ -57,7 +61,7 @@ dependencies {
     implementation 'com.google.firebase:firebase-core:18.0.3'
     implementation 'com.google.firebase:firebase-messaging:21.1.0'
 
-    implementation('com.futurae.sdk:futuraekit:1.3.0')
+//    implementation('com.futurae.sdk:futuraekit:1.3.0')
 
 //  Use these if you are NOT using Maven
 //    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
@@ -67,7 +71,7 @@ dependencies {
 //    implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
 //    implementation 'com.github.nisrulz:easydeviceinfo-base:2.4.1'
 //    implementation 'com.google.code.gson:gson:2.8.6'
-//    implementation files('src/main/libs/futuraekit.aar')
+    implementation files('../../futuraekit.aar')
 
 }
 

FuturaeDemo/app/src/main/AndroidManifest.xml

@@ -15,7 +15,7 @@
   <application
       tools:replace="android:allowBackup"
       android:allowBackup="true"
-      android:backupAgent=".DemoBackupAgent"
+      android:backupAgent=".CustomBackupAgent"
       android:icon="@mipmap/ic_launcher"
       android:label="@string/app_name"
       android:name="com.futurae.futuraedemo.AppMain"

FuturaeDemo/app/src/main/java/com/futurae/futuraedemo/CustomBackupAgent.kt

+package com.futurae.futuraedemo
+
+import android.app.backup.BackupAgent
+import android.app.backup.BackupDataInput
+import android.app.backup.BackupDataOutput
+import android.os.ParcelFileDescriptor
+import android.util.Log
+import java.io.*
+import kotlin.random.Random
+
+class CustomBackupAgent : BackupAgent() {
+
+    private val TAG = CustomBackupAgent::class.simpleName
+    private val PREFS_BACKUP_KEY = "prefs_shared_prefs_backup_key"
+
+    override fun onBackup(oldState: ParcelFileDescriptor?, data: BackupDataOutput, newState: ParcelFileDescriptor?) {
+        try {
+
+            //call SDK's backup agent
+            com.futurae.sdk.BackupAgent.onBackupAccounts(this, oldState, data, newState)
+
+            //back up your own data
+            val sp = getSharedPreferences(PREFS_NAME, MODE_PRIVATE)
+            val randomInt = Random.nextInt(10)
+            sp.edit().putInt(PREF_RANDOM_STRING, randomInt).apply()
+
+            val preferenceValue = randomInt.toString()
+            Log.d(
+                TAG,
+                "Starting backup of the prefs configuration in $PREFS_BACKUP_KEY, store: $randomInt as $preferenceValue"
+            )
+
+            val bufStream = ByteArrayOutputStream()
+            val outWriter = DataOutputStream(bufStream)
+            outWriter.writeUTF(preferenceValue)
+            val buffer = bufStream.toByteArray()
+            val len = buffer.size
+            data.writeEntityHeader(PREFS_BACKUP_KEY, len)
+            data.writeEntityData(buffer, len)
+        } catch (e: IOException) {
+            Log.e(TAG, e.message)
+            throw e
+        }
+    }
+
+    override fun onRestore(data: BackupDataInput, appVersionCode: Int, newState: ParcelFileDescriptor?) {
+        while (data.readNextHeader()) {
+            //if it's your backup key, proceed with restoring backed-up values
+            if (PREFS_BACKUP_KEY == data.key) {
+                try {
+                    val dataSize = data.dataSize
+                    val dataBuf = ByteArray(dataSize)
+                    data.readEntityData(dataBuf, 0, dataSize)
+                    val baStream = ByteArrayInputStream(dataBuf)
+                    val `in` = DataInputStream(baStream)
+                    val storedValue = `in`.readUTF()
+                    if (storedValue.isBlank()) {
+                        return
+                    }
+                    Log.d(
+                        TAG,
+                        "onRestore: Prefs restore from the backup completed. Value: ${storedValue}, calling SDK backup agent"
+                    )
+                    val sp = getSharedPreferences(PREFS_NAME, MODE_PRIVATE)
+                    sp.edit().putInt(PREF_RANDOM_STRING, storedValue.toInt()).apply()
+                } catch (e: IOException) {
+                    Log.e(TAG, e.message)
+                    throw e
+                } catch (e: Exception) {
+                    Log.d(TAG, e.message)
+                }
+            } else {
+                com.futurae.sdk.BackupAgent.onRestoreAccountsData(this, data)
+            }
+        }
+    }
+
+    companion object {
+        const val PREFS_NAME = "PREFS_NAME_CUSTOM"
+        const val PREF_RANDOM_STRING = "PREF_RANDOM_STRING"
+    }
+}
\ No newline at end of file

FuturaeDemo/app/src/main/java/com/futurae/futuraedemo/DemoBackupAgent.java

-package com.futurae.futuraedemo;
-
-import android.app.backup.BackupDataInput;
-import android.app.backup.BackupDataOutput;
-import android.os.ParcelFileDescriptor;
-import android.util.Log;
-
-import com.futurae.sdk.BackupAgent;
-
-import java.io.IOException;
-
-public class DemoBackupAgent extends android.app.backup.BackupAgent {
-
-    private static final String TAG = DemoBackupAgent.class.getSimpleName();
-
-    @Override
-    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState) {
-
-        try {
-            BackupAgent.onBackupAccounts(this, oldState, data, newState);
-        } catch (IOException e) {
-            Log.e(TAG, e.getMessage(), e);
-        }
-    }
-
-    @Override
-    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) {
-        try {
-            BackupAgent.onRestoreAccounts(this, data, appVersionCode, newState);
-        } catch (IOException e) {
-            Log.e(TAG, e.getMessage(), e);
-        }
-    }
-}
\ No newline at end of file

FuturaeDemo/build.gradle

 buildscript {
-    
+    ext.kotlin_version = '1.5.0'
+
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:4.0.0'
-        classpath 'com.google.gms:google-services:4.2.0'
+        classpath 'com.google.gms:google-services:4.3.10'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
     }
 }
 
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }