Take Android Screenshot programmatically-whatever on screen-app may be in background-not rooted device

Question

I want to take Screenshot of Android device programmatically. I have searched lot of things but wherever i found, it is saying that either your device should be rooted or only you can take screenshot of your app only, i.e. if your app is in background then it will not take screenshot of home screen.

In short, i want screenshot which gives me whatever is on screen that user can seen. My own app may be in background.

1. Device is not rooted
2. Whole screen(only visible portion to user)
3. App may be in background(but still should take screenshot of whatever visible to user, i.e. may be home screen)

Answer 1

To get screenshot you need to get root layout of the view

getWindow().getDecorView();

Cache the View into Bitmap

public static File getScreenShot(Context context,View parentLayout) 
    {
        parentLayout.setDrawingCacheEnabled(true);
        Bitmap cachedBitmap= parentLayout.getDrawingCache();
        Bitmap finalBitmap = cachedBitmap.copy(Bitmap.Config.RGB_565, true);
            return saveBitmap(context,finalBitmap);
    }

Save the bitmap on the device or such

private static File saveBitmap(Context context,Bitmap bitmap) 
    {
        File snapShot=null;
        try 
        {
            String cacheDirectory=getCacheDirectory(context);               
            snapShot=new File(cacheDirectory, "Screenshot.png");
            FileOutputStream out = new FileOutputStream(snapShot);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
            out.close();
        } catch (Exception e) 
        {
               e.printStackTrace();
        }
        return snapShot;
    }