Screenshot is black

Question

I'm trying to take a screen shot and save it as a png file on the sdcard. My file is saved with its file size as 1.57Kb but it is black. I'm using the following code:

View content = findViewById(R.id.id_ll_SurfaceView);
content.setDrawingCacheEnabled(true);
Bitmap b = content.getDrawingCache();
b.createBitmap(800, 480, Config.ARGB_8888);
File file = new File("/sdcard/test.png");
try
{
    file.createNewFile();
    FileOutputStream fos = new FileOutputStream(file);
    FileOutputStream(
        Environment.getExternalStorageDirectory().getAbsoluteFile()+"/test.jpg"));
    b.compress(CompressFormat.PNG, 100, fos);
    fos.close();
    Toast.makeText(getApplicationContext(), "Saved", 0).show();
}
catch (Exception e)
{
    e.printStackTrace();
}

Where are you calling the code? Is the view `id_ll_SurfaceView` already rendered on screen which this code is executed? — Karthik, Dec 09 '11 at 06:50
you can also check [here](http://stackoverflow.com/questions/8294110/taking-screenshot/8366223#8366223). — Lalit Poptani, Dec 09 '11 at 07:00
`b.createBitmap(800, 480, Config.ARGB_8888);` line is completely useless...`createBitmap` is static funtion, you're ignoring the returned Bitmap. I think you mean to resize the Bitmap. — st0le, Dec 09 '11 at 07:33
actually i m using cocos2d.... now i placed some images on its surfaceview, played aroung a bit and trying to save the whole screen as image file...this is the full scenerio — Noman, Dec 09 '11 at 07:34

score 2 · Answer 1 · edited May 23 '17 at 12:32

Are you taking screenshot from onCreate()..You have to wait till view is completely drawn on the screen..Use ViewTreeObserver to get a callback when view is completely drawn on the screen..

add this code in onCreate..

ViewTreeObserver vto = yourView.getViewTreeObserver();

vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
  @Override
  public void onGlobalLayout() {
    layout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    yourScreenshotFunction();
  }
});

Now implement this function

public void yourScreenshotFunction(){
 //Add your screenshot taking code here..
}

See my question here..I have explained the procedure under title Final Outcome..

user370305 · Accepted Answer · 2011-12-09T06:50:34.873

1

I am doing just,

main.setDrawingCacheEnabled(true);
screenshot = Bitmap.createBitmap(main.getDrawingCache());
File file = new File("/sdcard/test.png");
        try
        {
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            screenshot.compress(CompressFormat.PNG, 100, fos);
            fos.close();
            Toast.makeText(getApplicationContext(), "Saved", 0).show();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }

Here main is your activity's view..

EDIT: Look at this tutorial Android take screenshot from code

edited Dec 09 '11 at 06:50

answered Dec 09 '11 at 06:43

user370305

108,599
23
164
151

@user370305 Can you please copy your main activity aswell? Not sure how to include getDrawingcache and serDrawingCacheEnabled() functions. Thank you – Sandeep May 02 '13 at 03:31

score 0 · Answer 3 · answered Dec 19 '11 at 06:22

0

Go to eclipse...

Go to Windows
Open Perspective
DDMS
Select your emulator or phone on the left hand side.
Click on the camera icon just above in the toolbar.
EASY AS THAT :)

answered Dec 19 '11 at 06:22

user1025013

123
1
9

@user1025013... user will not use Eclipse in his phone for the application! – Noman Dec 19 '11 at 07:39
@Noman Yeah he said he just wants a screenshot of the phone not an app to do it... he wants to create an app that does it but this shows him something that is already done – user1025013 Dec 19 '11 at 07:56

Screenshot is black

3 Answers3