Java Code Examples for androidx.core.graphics.ColorUtils#calculateLuminance()

static Bitmap generateLetterIcon(String letter, float h, int size, Context context) {
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    float s = prefs.getInt("saturation", 100) / 100f;
    float v = prefs.getInt("brightness", 100) / 100f;
    float t = prefs.getInt("threshold", 50) / 100f;

    int bg = Color.HSVToColor(new float[]{h, s, v});
    double lum = ColorUtils.calculateLuminance(bg);

    Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawColor(bg);

    Paint paint = new Paint();
    paint.setColor(lum < t ? Color.WHITE : Color.BLACK);
    paint.setTextSize(size / 2f);
    paint.setTypeface(Typeface.DEFAULT_BOLD);

    canvas.drawText(letter,
            size / 2f - paint.measureText(letter) / 2,
            size / 2f - (paint.descent() + paint.ascent()) / 2, paint);

    return bitmap;
}
 

void setColor(Integer color) {
    if (color == null)
        color = Color.TRANSPARENT;
    this.color = color;

    GradientDrawable background = new GradientDrawable();
    background.setColor(color);
    background.setStroke(
            Helper.dp2pixels(getContext(), 1),
            Helper.resolveColor(getContext(), R.attr.colorSeparator));
    setBackground(background);

    if (color == Color.TRANSPARENT)
        setTextColor(Helper.resolveColor(getContext(), android.R.attr.textColorPrimary));
    else {
        double lum = ColorUtils.calculateLuminance(color);
        setTextColor(lum < 0.5 ? Color.WHITE : Color.BLACK);
    }
}
 

@Override
public void bind(CheckBoxSetting entry) {
    super.bind(entry);
    int[] overrideColors = ((ThemeOptionSetting) entry).overrideColors;
    int bgColor = StyledAttributesHelper.getColor(mCheckBox.getContext(),
            android.R.attr.colorBackground, 0);
    boolean darkBg = ColorUtils.calculateLuminance(bgColor) < 0.4;
    int overrideColor = overrideColors[0];
    for (int c : overrideColors) {
        if ((!darkBg && ColorUtils.calculateLuminance(c) < 0.75)
                || (darkBg && ColorUtils.calculateLuminance(c) > 0.25)) {
            overrideColor = c;
            break;
        }
    }
    if (overrideColor != 0)
        CompoundButtonCompat.setButtonTintList(mCheckBox,
                ColorStateList.valueOf(overrideColor));
    else
        CompoundButtonCompat.setButtonTintList(mCheckBox, mDefaultButtonTintList);
}
 

static int adjustLuminance(int color, boolean dark, float min) {
    float lum = (float) ColorUtils.calculateLuminance(color);
    if (dark ? lum < min : lum > 1 - min)
        return ColorUtils.blendARGB(color,
                dark ? Color.WHITE : Color.BLACK,
                dark ? min - lum : lum - (1 - min));
    return color;
}
 

protected void setPaletteBtnColor(int color) {
    ViewCompat.setBackgroundTintList(mPaletteBtn, ColorStateList.valueOf(color));
    int paletteIconColor = 0xFFFFFFFF;
    if (ColorUtils.calculateLuminance(color) >= 0.6)
        paletteIconColor = 0xFF000000;
    ImageViewCompat.setImageTintList(mPaletteIcon, ColorStateList.valueOf(paletteIconColor));
}
 

@Override
public void bind(int color) {
    super.bind(color);
    if (ColorUtils.calculateLuminance(color) < 0.6)
        ImageViewCompat.setImageTintList(mIcon, ColorStateList.valueOf(0xFFFFFFFF));
    else
        ImageViewCompat.setImageTintList(mIcon, ColorStateList.valueOf(0xFF000000));
}
 

private void setColorFilter(int position) {
  if (position == selectedPosition && ColorUtils.calculateLuminance(colors[position]) >= 0.65) {
    imageView.setColorFilter(Color.BLACK, PorterDuff.Mode.SRC_IN);
  } else {
    imageView.setColorFilter(null);
  }
}
 

public void recolor() {
    chartView.updateColors();
    chartView.invalidate();

    zoomedChartView.updateColors();
    zoomedChartView.invalidate();

    chartHeaderView.recolor();
    chartHeaderView.invalidate();

    if (data != null && data.chartData != null && data.chartData.lines != null && data.chartData.lines.size() > 1) {
        for (int i = 0; i < data.chartData.lines.size(); i++) {
            int color;
            if (data.chartData.lines.get(i).colorKey != null && Theme.hasThemeKey(data.chartData.lines.get(i).colorKey)) {
                color = Theme.getColor(data.chartData.lines.get(i).colorKey);
            } else {
                boolean darkBackground = ColorUtils.calculateLuminance(Theme.getColor(Theme.key_windowBackgroundWhite)) < 0.5f;
                color = darkBackground ? data.chartData.lines.get(i).colorDark :
                        data.chartData.lines.get(i).color;
            }
            if (i < checkBoxes.size()) {
                checkBoxes.get(i).recolor(color);
            }
        }
    }
    progressView.setProgressColor(Theme.getColor(Theme.key_progressCircle));
    errorTextView.setTextColor(Theme.getColor(Theme.key_dialogTextGray4));
}
 

public void updateColors() {
    if (line.colorKey != null && Theme.hasThemeKey(line.colorKey)) {
        lineColor = Theme.getColor(line.colorKey);
    } else {
        int color = Theme.getColor(Theme.key_windowBackgroundWhite);
        boolean darkBackground = ColorUtils.calculateLuminance(color) < 0.5f;
        lineColor = darkBackground ? line.colorDark : line.color;
    }
    paint.setColor(lineColor);
    bottomLinePaint.setColor(lineColor);
    selectionPaint.setColor(lineColor);
}
 

public void recolor() {
    chartView.updateColors();
    chartView.invalidate();

    zoomedChartView.updateColors();
    zoomedChartView.invalidate();

    chartHeaderView.recolor();
    chartHeaderView.invalidate();

    if (data != null && data.chartData != null && data.chartData.lines != null && data.chartData.lines.size() > 1) {
        for (int i = 0; i < data.chartData.lines.size(); i++) {
            int color;
            if (data.chartData.lines.get(i).colorKey != null && Theme.hasThemeKey(data.chartData.lines.get(i).colorKey)) {
                color = Theme.getColor(data.chartData.lines.get(i).colorKey);
            } else {
                boolean darkBackground = ColorUtils.calculateLuminance(Theme.getColor(Theme.key_windowBackgroundWhite)) < 0.5f;
                color = darkBackground ? data.chartData.lines.get(i).colorDark :
                        data.chartData.lines.get(i).color;
            }
            if (i < checkBoxes.size()) {
                checkBoxes.get(i).recolor(color);
            }
        }
    }
    progressView.setProgressColor(Theme.getColor(Theme.key_progressCircle));
    errorTextView.setTextColor(Theme.getColor(Theme.key_dialogTextGray4));
}
 

public void updateColors() {
    if (line.colorKey != null && Theme.hasThemeKey(line.colorKey)) {
        lineColor = Theme.getColor(line.colorKey);
    } else {
        int color = Theme.getColor(Theme.key_windowBackgroundWhite);
        boolean darkBackground = ColorUtils.calculateLuminance(color) < 0.5f;
        lineColor = darkBackground ? line.colorDark : line.color;
    }
    paint.setColor(lineColor);
    bottomLinePaint.setColor(lineColor);
    selectionPaint.setColor(lineColor);
}
 

public static boolean isDark(@ColorInt int color) {
    return ColorUtils.calculateLuminance(color) < 0.5;
}
 

private static boolean isColorLight(@ColorInt int color) {
  return color != TRANSPARENT && ColorUtils.calculateLuminance(color) > 0.5;
}
 

public void setCurrentColor(@ColorInt int currentColor) {
    this.currentColor = currentColor;
    currentColorLuminance = ColorUtils.calculateLuminance(this.currentColor);
}