.. _Method 1. Non-inheriting the main Activity:

Method 1. Non-inheriting the main Activity
==============================================================

1. Writing JAR file in Android Studio 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 

- 1)	Create a new class and write your own method (here's how to create the file and update the media library

.. code-block:: java

    package com.pico.jartest;
    import …;

    public class JarClass {
    	public void updateFile(Context context, String fullFileName) {
      		Log.e(TAG, "updateFile: ");
      		Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
      		intent.setData(Uri.fromFile(new File(fullFileName)));
      		context.sendBroadcast(intent);
    	}
     }

- 2)	Add the following code on the app-> build.gradle root node, which is the same level as android and dependencies

.. code-block:: java

    task createJarDebug(type: Jar,dependsOn: ['build']) {
      baseName "test"
      from 'build/intermediates/javac/debug/compileDebugJavaWithJavac/classes' 
      include('**')
      exclude('**/R.class')
      exclude('**/R$*.class')
      exclude('**/BuildConfig.class')
      exclude('**/MainActivity.class')
      exclude('**/MainActivity$*.class')
    }

- 3)	In Terminal, type gradlew createJarDebug (you need to generate the obguile package, type gradlew createJarDebug proguard)

If prompted build success, the package succeeds

**Jar package path**: app/build/libs/test.jar

Copy to Unity engineer and tell them package name. Class name, interface name

2. Use the JAR file in Unity project
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 

- 1)	Copy the Jar package to the **Assets/Plugins/Android/** directory

- 2)	Create a new script, use “**PackageName.ClassName**” to initialize object of the class defined in JAR file.

.. code-block:: c#

    public class filetest : MonoBehaviour {
      string fullFileName;
      AndroidJavaObject updateFileManager;
      AndroidJavaObject ActivityContext;
      
      private void Start()
      {
        fullFileName = "/storage/emulated/0/Download/update.txt";
        updateFileManager = new AndroidJavaObject("com.picovr.updateanyfile.UpdateManager");
        ActivityContext = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
      }
      public void updateFile()
      {
        updateFileManager.Call("updateFile", ActivityContext, fullFileName);
      }
    }