Androidpdfviewer: Night mode

[amin9565]

hello and thank u for the lib.
i need to add night mode for pdf but i don't
what do shall ?

[1stmetro]

I made a grey scale option if this helps....

[amin9565]

please give me the link ...

[1stmetro]

I dont have the code handy but basically i set a grey scale filter over the pdfview, i dont remember that i changed the whole activity, since some people may have issues reading in color hence the greyscale mode or night mode, etc.

[ArvidNy]

This is what I did to do to accomplish a night mode. I basically just make the bitmap grayscale and then invert the colors. I put the line of code in the RenderingHandler class above the last line in the proceed method.

if (pdfView.isNightMode()) {
    render = toNightMode(render, renderingTask.bestQuality);
}

The following method is also needed somewhere in the class:

private Bitmap toNightMode(Bitmap bmpOriginal, boolean bestQuality)
    {
        int width, height;
        height = bmpOriginal.getHeight();
        width = bmpOriginal.getWidth();

        Bitmap nightModeBitmap = Bitmap.createBitmap(width, height, bestQuality ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
        Canvas c = new Canvas(nightModeBitmap);
        Paint paint = new Paint();

        ColorMatrix grayScaleMatrix = new ColorMatrix();
        grayScaleMatrix.setSaturation(0);
        ColorMatrix invertMatrix =
                new ColorMatrix(new float[] {
                        -1,  0,  0,  0, 255,
                        0, -1,  0,  0, 255,
                        0,  0, -1,  0, 255,
                        0,  0,  0,  1,   0});

        ColorMatrix nightModeMatrix = new ColorMatrix();
        nightModeMatrix.postConcat(grayScaleMatrix);
        nightModeMatrix.postConcat(invertMatrix);

        paint.setColorFilter(new ColorMatrixColorFilter(nightModeMatrix));
        c.drawBitmap(bmpOriginal, 0, 0, paint);

        return nightModeBitmap;
    }

It should also be noted that this means each part will render a tad slower, but in my experience we're not even talking about a second so in my opinion it's not really visible to the naked eye.

Might be a good idea to also change the background color in PDFView:

if (nightMode) {
    canvas.drawColor(Color.BLACK);
} else {
    canvas.drawColor(Color.WHITE);
}

Hope that helps!

[Abhisheknarsing]

please give me the link ...

.onDraw(new OnDrawListener() {
@Override
public void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

                                        canvas.drawColor(Color.argb(0.4f,0,0,0));}

                                }
                            })