Crash on Android when sharing screenshot using Lua

cocos2d-x Lua
#1

I am working on a game using cocos2d-x 3.1.1 + Lua, for Android. But that game crash when sharing screenshot. Below are some code snippets:

-- take screenshot using Lua
--
local size = cc.Director:getInstance():getVisibleSize()
local texture = cc.RenderTexture:create(size.width, size.height)
texture:setPosition(size.width / 2, size.height / 2)

texture:begin()
cc.Director:getInstance():getRunningScene():visit()
texture:endToLua()
texture:saveToFile(filename, cc.IMAGE_FORMAT_PNG)

Then I send the file to Java via LuaJavaBridge. Java code do below things:

  1. Copy the image from private folder to sdcard
  2. creates an Intent of ACTION_SEND from the copied image, and call startActivity()

I upload the apk to phone. When I tap the share button, a share chooser dialog pops up. Then I tap Cancel to dismiss the dialog, app crashes and go back to desktop.

Some facts may help to locate issue:

  1. Screenshot is taken correctly. I can see the screenshot file in sdcard.
  2. I can share if comment out above Lua code, which is used to take screenshot.

Someone can help on this?

Thank you

#2

I use the lua-tests/NewEventDispatcher/PauseResumeTargetTest to check this,I insert the following code in the ‘popup’ funciton:

        local size = cc.Director:getInstance():getVisibleSize()
        local texture = cc.RenderTexture:create(size.width, size.height)
        texture:setPosition(size.width / 2, size.height / 2)
        texture:begin()
        cc.Director:getInstance():getRunningScene():visit()
        texture:endToLua()
        texture:saveToFile("image-0.png", cc.IMAGE_FORMAT_PNG)

Then, I tap Popup to pop up a layer,then i tap close to exit layer.The test didn’t crash,can you pasts more codes?
And, The v3.2 add the CaptureScreenTest,you can also refer to it.

#3

Thanks. I still don’t get the reason why it crashes. It triggers an exception in libc, signal 11.
Will try it on 3.2.

#4

In Java Code
First you must to get the main looper

mHandler = new Handler(this.getMainLooper());

And then start a activity use the mHandler:

mHandler.post(new Runnable() {
	
	@Override
	public void run() {
		String path = "/mnt/sdcard/elevengames/";
		String imagePath = path + "screenshot.png";
		File dir = new File(path);
		if (!dir.exists()) {
			dir.mkdir();
		}
		File imageFile = new File(imagePath);
		try {
			imageFile.createNewFile();
			FileInputStream is = mContext.openFileInput("screenshot.png");
			FileOutputStream os = new FileOutputStream(imageFile);
			byte[] buffer = new byte[1024];
			int count = 0;
			while((count = is.read(buffer)) != -1) {
				os.write(buffer);
				os.flush();
			}
			os.close();
			is.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		Intent shareIntent = new Intent(Intent.ACTION_SEND);
		shareIntent.setType("image/*");
		Uri uri = Uri.fromFile(imageFile);
		shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
		mContext.startActivity(shareIntent);
	}
});