Development Handbook: Interaction between Unity and Android (Unity2019+)

      It is necessary to adjust the native functions of android again, this time using the unity2019+ version and the as4+ version. It is different from the previous Unity2018+AS3+ interaction , so record it again.
      I will write the operation in detail, and the logo will be very detailed.
      Preparation tools:
      1. Unity2019.4.22f1
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      2. AndroidStudio4.1.1

      Specific process:
      1. Create a new AS empty project
      2. Set basic information

      Here we only need to configure com.CompanyName, and select the minimum api26 I need (according to your own needs)

      3. Expand the project directory
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      4. Copy the classes.jar file to libs
      Copy the classes.jar file of Unity2019 to the as project libs

      5. Copy the UnityPlayerActivity.java file to the src directory
      Copy UnityPlayerActivity.java to the as project src directory
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This step is a very critical step, because the new version of unity classes.jar file no longer contains the UnityPlayerActivity class, so it must be manually copied to the as project.

      6. Synchronize the as project and add library references in
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      the upper right corner of the as window, click the synchronization project,

      select classes.jar, right-click AddAsLibrary,
      then we can officially start writing code

7. UnityPlayerActivity add package name
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Open the UnityPlayerActivity add package as follows:

import com.unity3d.player.IUnityPlayerLifecycleEvents;
import com.unity3d.player.UnityPlayer;

      7. MainActivity starts to write code
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      to inherit UnityPlayerActivity, press shift+alt+enter to import the package and

      start to write the android functions required by my unity project.

      The specific android functions need to be directly Baidu, here is only a demonstration.

      8. Modify the build.gradle configuration
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      change application to library, and comment applicationId "com.Bsti"

      9. Modify the androidmanifest.xml configuration
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      Red is the required item, and sky blue is the added permission (according to the specific needs of your own functions)

      10. Synchronize the project, build the project
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      , click the upper right corner of the as window to synchronize the project,

      click rebuild project to build the aar file

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The aar file is built

11. Import the unity project

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Use compression software to open the aar file, just copy these two files to Assets\Plugins\Android

12. Writing c# code call
still uses AndroidJavaClass, AndroidJavaObject to call, as follows:

 private void OnGUI()
 {
    
    
     if (GUI.Button(new Rect(0, 0, 200, 200), "Toast"))
     {
    
    
         AndroidJavaClass ajc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
         AndroidJavaObject ajo = ajc.GetStatic<AndroidJavaObject>("currentActivity");
         ajo.Call("ShowToast", "Unity Message");
     }
     if (GUI.Button(new Rect(300, 0, 200, 200), "Lanuch"))
     {
    
    
         AndroidJavaClass ajc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
         AndroidJavaObject ajo = ajc.GetStatic<AndroidJavaObject>("currentActivity");
         ajo.Call("LanuchApp", "com.Bsti.WS1");
     }
 }

Make sure that the method name string does not make mistakes.

      13. Package unity apk test
      release configuration
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      and then package

insert image description here Install to mobile phone, test:

ok, this is the complete interaction process.

Development Handbook: Interaction between Unity and Android (Unity2019+)

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