Taking screenshot programmatically in android

AndroidScreenshot.java

private void takeScreenshot() {
    Date now = new Date();
    android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);

    try {
        // image naming and path  to include sd card  appending name you choose for file
        String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";

        // create bitmap screen capture
        View v1 = getWindow().getDecorView().getRootView();//inside acitivity
        //View v1 = getActivity().getWindow().getDecorView().getRootView(); //inside fragment
        v1.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
        v1.setDrawingCacheEnabled(false);

        File imageFile = new File(mPath);

        FileOutputStream outputStream = new FileOutputStream(imageFile);
        int quality = 100;
        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
        outputStream.flush();
        outputStream.close();

        openScreenshot(imageFile);
    } catch (Throwable e) {
        // Several error may come out with file handling or OOM
        e.printStackTrace();
    }
}

private void openScreenshot(File imageFile) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(imageFile);
    intent.setDataAndType(uri, "image/*");
    startActivity(intent);
}

Some references

https://stackoverflow.com/questions/2661536/how-to-programmatically-take-a-screenshot-in-android?rq=1 
http://www.viralandroid.com/2016/01/how-to-take-screenshot-programmatically-in-android.html 
https://stackoverflow.com/questions/20136121/android-how-to-take-screenshot-programatically
https://stackoverflow.com/questions/30196965/how-to-take-a-screenshot-of-current-activity-and-then-share-it