While learning Unity3D and developing my indie game for Android – Makura – last week, I was trying to set up a button to take a screenshot and share the image opening the default list of Android of the current social apps installed on the device.
I have been stuck for a while, getting errors using AndroidJavaClass and AndroidJavaObject on Unity to call the Java classes of Android.
Once I solved the problem I wanted to share the code on my blog, because I couldn’t find anywhere a solution.
The exact problem was including the jpg of the screenshot as uri for the EXTRA_STREAM parameter of the Intent java object, and let it open properly with other apps.
Below the code in C#:
//instantiate the class Intent AndroidJavaClass intentClass = new AndroidJavaClass("android.content.Intent"); //instantiate the object Intent AndroidJavaObject intentObject = new AndroidJavaObject("android.content.Intent"); //call setAction setting ACTION_SEND as parameter intentObject.Call<AndroidJavaObject>("setAction", intentClass.GetStatic<string>("ACTION_SEND")); //instantiate the class Uri AndroidJavaClass uriClass = new AndroidJavaClass("android.net.Uri"); //instantiate the object Uri with the parse of the url's file AndroidJavaObject uriObject = uriClass.CallStatic<AndroidJavaObject>("parse","file:///sdcard/expl.jpg"); //call putExtra with the uri object of the file intentObject.Call<AndroidJavaObject>("putExtra", intentClass.GetStatic<string>("EXTRA_STREAM"), uriObject); //set the type of file intentObject.Call<AndroidJavaObject>("setType", "image/jpeg"); //instantiate the class UnityPlayer AndroidJavaClass unity = new AndroidJavaClass("com.unity3d.player.UnityPlayer"); //instantiate the object currentActivity AndroidJavaObject currentActivity = unity.GetStatic<AndroidJavaObject>("currentActivity"); //call the activity with our Intent currentActivity.Call("startActivity", intentObject);
I hope this could help someone else!
Don’t hesitate to leave me a comment with your experiences or questions!
UPDATE 13 MAY 2014
Finally I had the time to make an example project for this utility.
I’ve heard that some of you had troubles to make it work, so I decided to create a kind of tutorial and share it so you can download it and test it!
My computer runs Windows 7 64bit, Unity Free 4.3.4f1, Java jdk1.7.0_55 and jre7.
At the moment the code is working perfectly, inside the zip file you can find “ShareTest.apk” to test the example on your device.
I really hope to help and make many people happy as, I wasn’t expecting this, but it seems that simple plugins like this are still sold! (Why am I sharing this, so?!!!)
Guys, let me know if you have still troubles! 🙂
UPDATE 27 AUG 2014
I’ve published the demo on Google Play and removed the apk inside the zip, you can install it to see how it works:
UPDATE 19 JULY 2015
Grant the Writing Access to External (SDCard) in PlayerSettings, otherwise you won’t be able to share pictures.
UPDATE 23 September 2019
This code doesn’t work anymore on the latest Android OS.
You can target Android 6 and it works fine, but if you want to publish it on Google Play, it won’t be accepted.