Java Android Studio Screenshot A TableLayout

Question

I am trying to get a screenshot of a scrollable table. The TableLayout has parent matching width/height and right/left padding. The TableRows width/height has wrap_content and textAlignment center.

After some work I got to this code:

private Bitmap getBitmapFromView(View view)
{
    view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);

    Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(bitmap);
    canvas.drawColor(Color.WHITE);

    view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
    view.draw(canvas);

    return bitmap;
}

While it does get all the information , it doesn't get the padding and/or textAlignment correctly , displaying the text too close to each other.

And this is how it should look vs how it looks: Image

I also tried a different approach:

Bitmap bitmap = getBitmapFromView(TableLayout, TableLayout.getHeight(), TableLayout.getWidth());

private Bitmap getBitmapFromView(View view, int height, int width) {
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        Drawable bgDrawable = view.getBackground();
        if (bgDrawable != null)
            bgDrawable.draw(canvas);
        else
            canvas.drawColor(Color.WHITE);
        view.draw(canvas);
        return bitmap;
    }

While this does keep the padding/alignment it always return every row but the last one (when adding new rows). So if i have 20 rows it returns only 19.

It also leaves a white space when i delete a row (where the deleted row was).

It seems like it doesn't update the TableLayout properly before getting the screenshot. I've tried using:

view.invalidate();
view.requestLayout();

But with no result.

In the first approach it gets all the data (when adding) and doesn't return white spaces where deleted rows are (when removing) but it has padding/alignment issues while in the second method it gets incomplete data.

You really should not be calling layout or measure. It will screw up the placement of the view inside the parent. Which is probably part of your spacing issues. — Gabe Sechan, Jun 15 '21 at 05:53
Does this answer your question? [How to render an android view to canvas WITHOUT rendering it first (i.e. without full layout)](https://stackoverflow.com/questions/60582424/how-to-render-an-android-view-to-canvas-without-rendering-it-first-i-e-without) — Andrew, Jun 16 '21 at 19:37

score 2 · Accepted Answer · answered Jun 16 '21 at 22:52

The second method should work but only after the table finished the job.

You can create a ViewTreeObserver.OnGlobalLayoutListener and put the screenshot code inside thus waiting for the table to finish the job.

ViewTreeObserver.OnGlobalLayoutListener tableLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        ViewTreeObserver observer = yourTableLayout.getViewTreeObserver();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            observer.removeOnGlobalLayoutListener(this);
        } else {
            observer.removeGlobalOnLayoutListener(this);
        }

        //Your code here
    }
};

And you can create it by using

yourTableLayout.getViewTreeObserver().addOnGlobalLayoutListener(tableLayoutListener);

Java Android Studio Screenshot A TableLayout

1 Answers1