Java

You can integrate the Ditto SDK into Kotlin projects to develop for the Android platform. 
For a complete overview of the platforms, transports, and devices the JavaScript SDK supports, select Java from the Directory of Compatibility Maps﻿.
For the API reference, see ditto 4.7.1.
To install the Java SDK:
1
Confirm that you meet the minimum requirements. (Prerequisites﻿)
2
Prepare your environment for Ditto. (Setting Up Your Environment﻿)
3
Set up your app permissions. (Configuring Permissions﻿)
4
Add Ditto to your app. (Integrating Ditto﻿)
Prerequisites
Following are the minimum requirements that must be met before attempting to install Ditto.
Android version 6.0 (Marshmallow) or later
minSdk version 23.0 or later
compileSdk version 31.0 or later
Java Development Kit (JDK) version 11.0 or later
Setting Up Your Environment
﻿
Configuring Permissions
﻿
Android Manifest Permissions
The Ditto Android SDK includes a set of permissions that are required to use all
the device features necessary to enable sync. The permissions below will be
automatically merged into your app's final manifest.
AndroidManifest.xml
<manifest
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android">

<uses-permission android:name="android.permission.BLUETOOTH"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"
    android:usesPermissionFlags="neverForLocation"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
    android:maxSdkVersion="32" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.NEARBY_WIFI_DEVICES"
    android:usesPermissionFlags="neverForLocation"
    tools:targetApi="tiramisu" />
<manifest
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android">

<uses-permission android:name="android.permission.BLUETOOTH"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"
    android:usesPermissionFlags="neverForLocation"
    tools:targetApi="s" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
    android:maxSdkVersion="32" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
    android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.NEARBY_WIFI_DEVICES"
    android:usesPermissionFlags="neverForLocation"
    tools:targetApi="tiramisu" />
﻿
The tools:targetApi attribute causes the permission to only be requested on
devices running the specified API level or higher. This avoids errors on older
OS versions that do not recognize the permission.
The android:maxSdkVersion attribute causes that permission to only be requested
on devices running the specified SDK level or lower. This avoids asking for more
permissions than Ditto needs, however it will prevent your app from being able
to request the permission on devices running a newer OS version. To opt out of
this behavior and request the permission on all OS versions, see the following
snippet:
Location Permission Override
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
    tools:remove="android:maxSdkVersion" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
    tools:remove="android:maxSdkVersion" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
    tools:remove="android:maxSdkVersion" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"
    tools:remove="android:maxSdkVersion" />
﻿
Note that you may need to add the xmlns:tools="http://schemas.android.com/tools"
namespace attribute to your app's root <manifest> tag as shown in the
AndroidManifest.xml example above.
This will configure your app's build to ignore the android:maxSdkVersion
attribute in our SDK allowing the permission to be requested on any SDK version.
This techniquie can be used to tweak any permissions to your liking.
For more details, see the documentation for the Bluetooth and WiFi Aware permissions in the Android Documentation.
Runtime Permissions
﻿
Java
void checkLocationPermission() {
   DittoSyncPermissions permissions = new DittoSyncPermissions(this);
   String[] missing = permissions.missingPermissions(permissions.requiredPermissions());
   if (missing.length > 0) {
      this.requestPermissions(missing, 0);
   }
}
void checkLocationPermission() {
   DittoSyncPermissions permissions = new DittoSyncPermissions(this);
   String[] missing = permissions.missingPermissions(permissions.requiredPermissions());
   if (missing.length > 0) {
      this.requestPermissions(missing, 0);
   }
}
﻿
﻿
Java
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
   super.onRequestPermissionsResult(requestCode, permissions, grantResults);
   this.ditto.refreshPermissions();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
   super.onRequestPermissionsResult(requestCode, permissions, grantResults);
   this.ditto.refreshPermissions();
}
﻿
﻿
Integrating Ditto
1
Add Ditto to your application.
We recommend placing this in your Application.onCreate method. Note that the Context you want to reference here is the Application level Context, rather than whatever Activity you might happen to be instantiating the Ditto instance from initially. This is because you need to ensure that your app is keeping a single Ditto instance alive for the entire lifetime of the application so it's not going out of scope or getting garbage collected.
Java
DittoDependencies androidDependencies = new DefaultAndroidDittoDependencies(this.context);
DittoLogger.setMinimumLogLevel(DittoLogLevel.DEBUG);
DittoIdentity identity = new DittoIdentity.OnlinePlayground(androidDependencies, "REPLACE_ME_WITH_YOUR_APP_ID", "YOUR_PLAYGROUND_TOKEN_HERE");
Ditto ditto = new Ditto(androidDependencies, identity);

try {
    ditto.startSync();
} catch(DittoError e) {
    //handle error
}
DittoDependencies androidDependencies = new DefaultAndroidDittoDependencies(this.context);
DittoLogger.setMinimumLogLevel(DittoLogLevel.DEBUG);
DittoIdentity identity = new DittoIdentity.OnlinePlayground(androidDependencies, "REPLACE_ME_WITH_YOUR_APP_ID", "YOUR_PLAYGROUND_TOKEN_HERE");
Ditto ditto = new Ditto(androidDependencies, identity);

try {
    ditto.startSync();
} catch(DittoError e) {
    //handle error
}
﻿
2
Replace YOUR_APP_ID and YOUR_PLAYGROUND_TOKEN with your access credentials available in the portal.
For instructions on how to obtain your access credentials, see Onboarding﻿. For an introduction to authentication in Ditto, see Ditto Basics > Authentication and Initialization﻿.
﻿
Updated 03 May 2024
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