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.