To extend the default Unity activity, you create your own custom activity and set it as the application’s entry point. The process to do this is as follows:
UnityPlayerActivity
class.activity
as the application’s entry point.After you do this, you can implement custom behavior in your activity to control interactions between Unity and Android.
To create a new activity:
.java
) or Kotlin (.kt
) file.UnityPlayerActivity
.The following code sample shows an example activity that overrides multiple functions.
package com.company.product;
import com.unity3d.player.UnityPlayerActivity;
import android.os.Bundle;
import android.util.Log;
public class OverrideExample extends UnityPlayerActivity {
protected void onCreate(Bundle savedInstanceState) {
// Calls UnityPlayerActivity.onCreate()
super.onCreate(savedInstanceState);
// Prints debug message to Logcat
Log.d("OverrideActivity", "onCreate called!");
}
public void onBackPressed()
{
// Instead of calling UnityPlayerActivity.onBackPressed(), this example ignores the back button event
// super.onBackPressed();
}
}
To use a custom activity for a Unity Android application, you must create a plug-in to contain the activity. Activities are written in either Java or Kotlin, which means you must use one of the following types of plug-ins:
If you want to create a custom activity for a single project, use Java and Kotlin source plug-ins. To create the source plug-ins, place the source files directly in the Assets folder of your project.
If you want to reuse the activity in multiple projects or distribute it to other people, use Android Archive (AAR) or JAR plug-ins. Managing one AAR or JAR plug-in file is easier to deliver functionalities in multiple projects.
Use an Android Library Project while you develop the plug-in and then compile it into an Android Archive plug-in when you complete the implementation, want to use it in multiple projects, or distribute it to other people.
After you create the plug-in, add the activity file to it.
After you create an activity and add it to a plug-in, you can set it as the application entry point. To do this, override the Android Manifest and set the name
attribute of the activity element to the class name of your custom activity.
The following Android Manifest example shows how to do this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.company.product">
<application android:icon="@drawable/app_icon" android:label="@string/app_name">
<activity android:name="com.YourPackage.name.OverrideExample"
android:theme="@style/UnityThemeSelector"
android:label="@string/app_name"
android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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