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android take screenshot of surface view shows black screen


android take screenshot of surface view shows black screen  using -'android,surfaceview'

I am attempting to Take a Screenshot of my Game through code and Share it through an Intent. I able to do of those things, however the screenshot always appears black. Here is the Code Related to Sharing the Screenshot:

View view = MainActivity.getView();
view.setDrawingCacheEnabled(true);
Bitmap screen = Bitmap.createBitmap(view.getDrawingCache(true));
.. save Bitmap


This is in the MainActivity:

view = new GameView(this);
view.setLayoutParams(new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.FILL_PARENT,
            RelativeLayout.LayoutParams.FILL_PARENT));

public static SurfaceView getView() {
    return view;
}


And the View itself:

public class GameView extends SurfaceView implements SurfaceHolder.Callback {
private static SurfaceHolder surfaceHolder;
...etc


And this is how I am Drawing everything:

Canvas canvas = surfaceHolder.lockCanvas(null);
        if (canvas != null) {
                Game.draw(canvas);
...


Ok, based on some answers, i have constructed this:

public static void share() {
    Bitmap screen = GameView.SavePixels(0, 0, Screen.width, Screen.height);
    Calendar c = Calendar.getInstance();
    Date d = c.getTime();
    String path = Images.Media.insertImage(
            Game.context.getContentResolver(), screen, "screenShotBJ" + d
                    + ".png", null);
    System.out.println(path + " PATH");
    Uri screenshotUri = Uri.parse(path);
    final Intent emailIntent = new Intent(
            android.content.Intent.ACTION_SEND);
    emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    emailIntent.putExtra(Intent.EXTRA_STREAM, screenshotUri);
    emailIntent.setType("image/png");
    Game.context.startActivity(Intent.createChooser(emailIntent,
            "Share High Score:"));
}


The Gameview contains the Following Method:

public static Bitmap SavePixels(int x, int y, int w, int h) {
    EGL10 egl = (EGL10) EGLContext.getEGL();
    GL10 gl = (GL10) egl.eglGetCurrentContext().getGL();
    int b[] = new int[w * (y + h)];
    int bt[] = new int[w * h];
    IntBuffer ib = IntBuffer.wrap(b);
    ib.position(0);
    gl.glReadPixels(x, 0, w, y + h, GL10.GL_RGBA, GL10.GL_UNSIGNED_BYTE, ib);
    for (int i = 0, k = 0; i < h; i++, k++) {
        for (int j = 0; j < w; j++) {
            int pix = b[i * w + j];
            int pb = (pix >> 16) & 0xff;
            int pr = (pix << 16) & 0x00ff0000;
            int pix1 = (pix & 0xff00ff00) | pr | pb;
            bt[(h - k - 1) * w + j] = pix1;
        }
    }

    Bitmap sb = Bitmap.createBitmap(bt, w, h, Bitmap.Config.ARGB_8888);
    return sb;
}


The Screenshot is still Black. Is there something wrong with the way I am saving it perhaps?

I have attempted several different methods to take the Screenshot, but none of them worked:
The one shown in the code above was the most commonly suggested one. But it does not seem to work.
Is this an Issue with using SurfaceView? And if so, why does view.getDrawingCache(true) even exist if I cant use it and how do I fix this?

WORKING CODE:

public static void share() {
    // GIVES BLACK SCREENSHOT:
    Calendar c = Calendar.getInstance();
    Date d = c.getTime();

    Game.update();
    Bitmap.Config conf = Bitmap.Config.RGB_565;
    Bitmap image = Bitmap.createBitmap(Screen.width, Screen.height, conf);
    Canvas canvas = GameThread.surfaceHolder.lockCanvas(null);
    canvas.setBitmap(image);
    Paint backgroundPaint = new Paint();
    backgroundPaint.setARGB(255, 40, 40, 40);
    canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(),
            backgroundPaint);
    Game.draw(canvas);
    Bitmap screen = Bitmap.createBitmap(image, 0, 0, Screen.width,
            Screen.height);
    canvas.setBitmap(null);
    GameThread.surfaceHolder.unlockCanvasAndPost(canvas);

    String path = Images.Media.insertImage(
            Game.context.getContentResolver(), screen, "screenShotBJ" + d
                    + ".png", null);
    System.out.println(path + " PATH");
    Uri screenshotUri = Uri.parse(path);
    final Intent emailIntent = new Intent(
            android.content.Intent.ACTION_SEND);
    emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    emailIntent.putExtra(Intent.EXTRA_STREAM, screenshotUri);
    emailIntent.setType("image/png");
    Game.context.startActivity(Intent.createChooser(emailIntent,
            "Share High Score:"));
}


Thank you.
    

asked Sep 24, 2015 by santosh soni
0 votes
297 views



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