Tries to take a screenshot of the entire list

I need to take a screenshot of the entire list, no matter what is visible on the screen, but in the end I end up with an image composed of details that are only visible on the display. Please help me to solve this problem.

Here's my code for reference:

ListView listView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TAG = getClass().getName();

    screenShot = (Button) findViewById(R.id.screenshot_button);
    listView = (ListView) findViewById(R.id.listView);
    screenRoot = (LinearLayout) findViewById(R.id.screenRoot);

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1, values);
    listView.setAdapter(adapter);
    listView.layout(0, 0, totalWidth, totalHeight);
    Display display = getWindowManager().getDefaultDisplay();
    @SuppressWarnings("deprecation")
    int width = screenRoot.getMeasuredWidth();
    int height = screenRoot.getMeasuredHeight();

    //totalHeight = listView.getChildAt(0).getHeight();
    //totalWidth = listView.getChildAt(0).getWidth();

    listView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            // You only need this method to be called once
            listView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            // Store the height in a class variable
            int width = listView.getMeasuredWidth();
            int height = listView.getMeasuredHeight();

            totalHeight = height;
            totalWidth = width;             

        }
    });

    screenShot.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "Inside on click",
                    Toast.LENGTH_SHORT).show();
            //Bitmap bitmap = takeScreenshot();
            //saveBitmap(bitmap);
            Log.i("The Total Height is ",""+totalHeight);
            Log.i("The Total Width is ",""+totalWidth);

            createImage(totalHeight, totalWidth, listView,"screenshot_new");


        }
    }); 

}


public Bitmap takeScreenshot() {
    Log.d(TAG, "Inside takeScreenShot method");
    listView.setDrawingCacheEnabled(true);
    listView.buildDrawingCache(true);
    Bitmap b = Bitmap.createBitmap(listView.getDrawingCache());    
    // View rootView = findViewById(android.R.id.content).getRootView();
    // rootView.setDrawingCacheEnabled(true);
    return listView.getDrawingCache();  

}

public void saveBitmap(Bitmap bitmap) {
    File imagePath = new File(Environment.getExternalStorageDirectory()
            + "/screenshot.png");
    FileOutputStream fos;
    try {
        fos = new FileOutputStream(imagePath);
        bitmap.compress(CompressFormat.JPEG, 100, fos);
        fos.flush();
        fos.close();
    } catch (FileNotFoundException e) {
        Log.e("GREC", e.getMessage(), e);
    } catch (IOException e) {
        Log.e("GREC", e.getMessage(), e);
    }
}

public File createImage(int height, int width, View view, String fileName) {
    Bitmap bitmapCategory = getBitmapFromView(view, height, width);
    return createFile(bitmapCategory, fileName);
}

public File createFile(Bitmap bitmap, String fileName) {

    File externalStorage = Environment.getExternalStorageDirectory();
    String sdcardPath = externalStorage.getAbsolutePath();
   // File reportImageFile = new File(sdcardPath + fileName + ".jpg");

    File reportImageFile = new File(Environment.getExternalStorageDirectory()
            + "/screenshot.png");
    try {
        if (reportImageFile.isFile()) {
            reportImageFile.delete();
        }
        if (reportImageFile.createNewFile()) {
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
            FileOutputStream fo = new FileOutputStream(reportImageFile);
            fo.write(bytes.toByteArray());
            bytes.close();
            fo.close();
            return reportImageFile;
        }
    } catch (Exception e) {
        Toast.makeText(MainActivity.this, "Unable to create Image.Try again", Toast.LENGTH_SHORT).show();
    }
    return null;
}

public Bitmap getBitmapFromView(View view, int totalHeight, int totalWidth) {


    Bitmap returnedBitmap = Bitmap.createBitmap(totalWidth, totalHeight, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(returnedBitmap);
    Drawable bgDrawable = view.getBackground();
    if (bgDrawable != null)
        bgDrawable.draw(canvas);
    else
        canvas.drawColor(Color.WHITE);
    totalWidth  = getTotalWidthofListView(listView);
   // totalHeight = getTotalHeightofListView(listView);

    //totalWidth  = 2160;
    totalHeight = 2160;

    view.measure(MeasureSpec.makeMeasureSpec(totalWidth, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(totalHeight, MeasureSpec.EXACTLY));
    view.layout(0, 0, totalWidth, totalHeight);
    view.draw(canvas);
    return returnedBitmap;
}


public static int getTotalHeightofListView(ListView listView) {

    ListAdapter mAdapter = listView.getAdapter();

    int totalHeight = 0;

    for (int i = 0; i < mAdapter.getCount(); i++) {
        View mView = mAdapter.getView(i, null, listView);

        mView.measure(
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),

                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        totalHeight += mView.getMeasuredHeight();
        Log.w("HEIGHT" + i, String.valueOf(totalHeight));

    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight
            + (listView.getDividerHeight() * (mAdapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
    return totalHeight;
}

public static int getTotalWidthofListView(ListView listView) {

    ListAdapter mAdapter = listView.getAdapter();

    int totalWidth = 0;

    for (int i = 0; i < mAdapter.getCount(); i++) {
        View mView = mAdapter.getView(i, null, listView);

        mView.measure(
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),

                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

        totalWidth += mView.getMeasuredHeight();
        Log.w("HEIGHT" + i, String.valueOf(totalWidth));

    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalWidth
            + (listView.getDividerHeight() * (mAdapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();
    return totalWidth;
}