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Simple way to capture screen and save to file for Android — Gideros Forum
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    Simple way to capture screen and save to file for Android

    RickyngkRickyngk Member
    edited August 2012 in Code snippets
    After googling, I found a simple way to capture screen on Android (I forgot where the original code come from)

    Use following code MyActivity.java (after export)
    + MyActivity.sRequireCapture, MyActivity.sRequireCaptureWidth, MyActivity.sRequireCaptureHeight, MyActivity.sRequireCaptureFilename : static var from MyActivity (defined by yourself)
    + TOSTRING(ANDROID_PACKAGE_NAME): replace this by your package name, such as: "com.guava7.demo"
    public void onDrawFrame(GL10 gl)
{
	GiderosApplication.getInstance().onDrawFrame();
	JavaNativeBridge.onDrawFrame();
 
	if(MyActivity.sRequireCapture)
	{                    
		int width = MyActivity.sRequireCaptureWidth;
		int height = MyActivity.sRequireCaptureHeight;
		int screenshotSize = width * height;
		ByteBuffer bb = ByteBuffer.allocateDirect(screenshotSize * 4);
		bb.order(ByteOrder.nativeOrder());
		gl.glReadPixels(0, 0, width, height, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, bb);
		int pixelsBuffer[] = new int[screenshotSize];
		bb.asIntBuffer().get(pixelsBuffer);
		bb = null;
		Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
		bitmap.setPixels(pixelsBuffer, screenshotSize-width, -width, 0, 0, width, height);
		pixelsBuffer = null;
 
		short sBuffer[] = new short[screenshotSize];
		ShortBuffer sb = ShortBuffer.wrap(sBuffer);
		bitmap.copyPixelsToBuffer(sb);
 
		//Making created bitmap (from OpenGL points) compatible with Android bitmap
		for (int i = 0; i < screenshotSize; ++i) {                  
			short v = sBuffer[i];
			sBuffer[i] = (short) (((v&0x1f) << 11) | (v&0x7e0) | ((v&0xf800) >> 11));
		}
		sb.rewind();
		bitmap.copyPixelsFromBuffer(sb);
		sLastScreenShoot = bitmap;
 
		//save to sd card
		String extStorageDirectory = Environment.getExternalStorageDirectory().toString() + "//Android//data//" + TOSTRING(ANDROID_PACKAGE_NAME) + "//";
 
		File dir = new File(extStorageDirectory);
		if (!(dir.exists() && dir.isDirectory())) 
		{
			dir.mkdirs();
		}
 
		System.out.println("Capture screen to " + extStorageDirectory + MyActivity.sRequireCaptureFilename + ".png");
		OutputStream outStream = null;
		File file = new File(extStorageDirectory, MyActivity.sRequireCaptureFilename + ".png");
		try {
			outStream = new FileOutputStream(file);
			bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
			outStream.flush();
			outStream.close();
		}
		catch(Exception e)
		{
			System.out.println("Fail to write screenshot");
			e.printStackTrace();
		}
 
		MyActivity.sRequireCapture = false;
	}
}
    P/S (@atilim)
    In onDrawFrame, how can I get screen-size, which return the same result as application:getDeviceWidth, application:getDeviceHeight ?

    Likes: Teranth

    http://www.guava7.com/
    +1 -1 (+1 / -0 )Share on Facebook

    Comments

    • TeranthTeranth Member
      @Rickyngk Thanks for the code I am certainly going to have to try that one out and how it works.
      ThumbHurt Games / FB: ThumbHurt Games / FB: Eli/Teranth | Skype: teranth37
      +1 -1Share on Facebook
    • RickyngkRickyngk Member
      I wrote a simple android plugin, which use for setting value of MyActivity.sRequireCapture, MyActivity.sRequireCaptureWidth, MyActivity.sRequireCaptureHeight, MyActivity.sRequireCaptureFilename

      I need this feature because sometimes I have to capture bug on android phone (capture screen on android phone is not good like iOS).

      @atilim: In onDrawFrame, how can I get screen-size, which return the same result as application:getDeviceWidth, application:getDeviceHeight ?
      http://www.guava7.com/
      +1 -1Share on Facebook
    • keszeghkeszegh Member
      I wrote a simple android plugin, which use for setting value of MyActivity.sRequireCapture, MyActivity.sRequireCaptureWidth, MyActivity.sRequireCaptureHeight, MyActivity.sRequireCaptureFilename

      I need this feature because sometimes I have to capture bug on android phone (capture screen on android phone is not good like iOS).

      @atilim: In onDrawFrame, how can I get screen-size, which return the same result as application:getDeviceWidth, application:getDeviceHeight ?
      Would it be possible that you share also the plugin with us, and/or an example project? Probably now i could do it for myself yet it would be just much simpler to have the plugin as well (maybe i'm speaking on behalf of others as well). Many thanks for the code in any case.
      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
      +1 -1Share on Facebook
    • totebototebo Member
      Would love to get my hands on the plug too. Pretty please @Rickyngk?

      :)

      Niclas
      My Gideros games: www.totebo.com
      +1 -1Share on Facebook
    • SinisterSoftSinisterSoft Maintainer
      There is a plugin in Labs that captures screens on Android and iOS.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
      +1 -1Share on Facebook
    • lsouchetlsouchet Member
      Hi there, I used the media plugin from gideros labs to take screenshot.
      Unfortunately I always get black empty screenshots. What am I doing wrong?

      Here is a code sample I use:
      mediamanager:addEventListener(Event.MEDIA_RECEIVE, function(e)
    print(e.path)
    local path = e.path
    mediamanager:postPicture(path) -- to save it to the gallery, when I simply display the image at e.path, the result is the same.
    end)
  mediamanager:takeScreenshot()
      +1 -1Share on Facebook
    • ar2rsawseenar2rsawseen Maintainer
      @lsouchet I think the problem would be incorrect installation, in the point where you modify activity to capture OpenGL buffer
      http://appcodingeasy.com/Gideros-Mobile
      +1 -1Share on Facebook
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