Example usage for android.graphics Color alpha

Introduction

In this page you can find the example usage for android.graphics Color alpha.

Prototype

@IntRange(from = 0, to = 255)
public static int alpha(int color)

Source Link

Document

Return the alpha component of a color int.

Usage

From source file:Main.java

private static int applyAlpha(final int color, final float alpha) {
    final int newAlpha = (int) (Color.alpha(color) * alpha);
    return Color.argb(newAlpha, Color.red(color), Color.green(color), Color.blue(color));
}

From source file:Main.java

public static String[] convertToARGB(int color) {
    String alpha = Integer.toHexString(Color.alpha(color)).toUpperCase(Locale.getDefault());
    String red = Integer.toHexString(Color.red(color)).toUpperCase(Locale.getDefault());
    String green = Integer.toHexString(Color.green(color)).toUpperCase(Locale.getDefault());
    String blue = Integer.toHexString(Color.blue(color)).toUpperCase(Locale.getDefault());

    // we want the strings with a leading 0 if needed
    return new String[] { ("00" + alpha).substring(alpha.length()), ("00" + red).substring(red.length()),
            ("00" + green).substring(green.length()), ("00" + blue).substring(blue.length()) };
}

From source file:Main.java

public static Bitmap olderImage(Bitmap bm) {

    int width = bm.getWidth();
    int height = bm.getHeight();
    int color;//from   ww w .j  a  v a2  s .c  om
    int r, g, b, a;

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    int[] oldPx = new int[width * height];
    int[] newPx = new int[width * height];

    bm.getPixels(oldPx, 0, width, 0, 0, width, height);

    for (int i = 0; i < oldPx.length; i++) {
        color = oldPx[i];
        r = Color.red(color);
        g = Color.green(color);
        b = Color.blue(color);
        a = Color.alpha(color);

        r = (int) (0.393 * r + 0.769 * g + 0.189 * b);
        g = (int) (0.349 * r + 0.686 * g + 0.168 * b);
        b = (int) (0.272 * r + 0.534 * g + 0.131 * b);

        if (r > 255) {
            r = 255;
        } else if (r < 0) {
            r = 0;
        }

        if (g > 255) {
            g = 255;
        } else if (g < 0) {
            g = 0;
        }

        if (b > 255) {
            b = 255;
        } else if (b < 0) {
            b = 0;
        }

        newPx[i] = Color.argb(a, r, g, b);
    }

    bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
    return bitmap;
}

From source file:Main.java

public static Bitmap backsheetImage(Bitmap bm) {

    int width = bm.getWidth();
    int height = bm.getHeight();
    int color;/*  w  w w .  j av  a 2 s.c o  m*/
    int r, g, b, a;

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    int[] oldPx = new int[width * height];
    int[] newPx = new int[width * height];

    bm.getPixels(oldPx, 0, width, 0, 0, width, height);

    for (int i = 0; i < oldPx.length; i++) {
        color = oldPx[i];
        r = Color.red(color);
        g = Color.green(color);
        b = Color.blue(color);
        a = Color.alpha(color);

        r = 255 - r;
        g = 255 - g;
        b = 255 - b;

        if (r > 255) {
            r = 255;
        } else if (r < 0) {
            r = 0;
        }

        if (g > 255) {
            g = 255;
        } else if (g < 0) {
            g = 0;
        }

        if (b > 255) {
            b = 255;
        } else if (b < 0) {
            b = 0;
        }

        newPx[i] = Color.argb(a, r, g, b);
    }

    bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
    return bitmap;
}

From source file:Main.java

/**
 * Returns the complimentary color of the given color
 * @param color/*from ww w. j a v a2s. c  o  m*/
 * @return
 */
public static int complimentaryColor(int color) {
    return Color.argb(Color.alpha(color), (~Color.red(color)) & 0xff, (~Color.green(color)) & 0xff,
            (~Color.blue(color)) & 0xff);
}

From source file:Main.java

public static Bitmap reliefImage(Bitmap bm) {

    int width = bm.getWidth();
    int height = bm.getHeight();
    int color;//  w  w w . j av  a  2 s.c  om
    int r, g, b, a;

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    int[] oldPx = new int[width * height];
    int[] newPx = new int[width * height];

    bm.getPixels(oldPx, 0, width, 0, 0, width, height);

    for (int i = 1; i < oldPx.length; i++) {
        color = oldPx[i - 1];
        r = Color.red(color);
        g = Color.green(color);
        b = Color.blue(color);
        a = Color.alpha(color);

        int nextColor = oldPx[i];
        int r1 = Color.red(nextColor);
        int g1 = Color.green(nextColor);
        int b1 = Color.blue(nextColor);

        r = r1 - r + 127;
        g = g1 - g + 127;
        b = b1 - b + 127;

        if (r > 255) {
            r = 255;
        } else if (r < 0) {
            r = 0;
        }

        if (g > 255) {
            g = 255;
        } else if (g < 0) {
            g = 0;
        }

        if (b > 255) {
            b = 255;
        } else if (b < 0) {
            b = 0;
        }

        newPx[i] = Color.argb(a, r, g, b);
    }

    bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
    return bitmap;
}

From source file:Main.java

/**
 * Retuns a darker color from a specified color by the factor.
 * @param color/* w w w  .jav a  2  s. c  o  m*/
 * @param factor
 * @return
 */
public static int darker(int color, float factor) {
    int a = Color.alpha(color);
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);

    return Color.argb(a, Math.max((int) (r * factor), 0), Math.max((int) (g * factor), 0),
            Math.max((int) (b * factor), 0));
}

From source file:Main.java

public static int adjustBrightness(int color, float percentage) {
    return Color.argb(Color.alpha(color), (int) (Color.red(color) * percentage),
            (int) (Color.green(color) * percentage), (int) (Color.blue(color) * percentage));
}

From source file:Main.java

private static int modulateColorAlpha(int baseColor, float alphaMod) {
    if (alphaMod == 1.0f) {
        return baseColor;
    }// www  .j  a va2s . co m
    final int baseAlpha = Color.alpha(baseColor);
    final int alpha = constrain((int) (baseAlpha * alphaMod + 0.5f), 0, 255);
    return (baseColor & 0xFFFFFF) | (alpha << 24);
}

From source file:Main.java

public static void smoothToTransparentFromColor(final View view, final int color) {
    Date firstDate = new Date();
    final long firstTime = firstDate.getTime();
    executeAsyncTask(new AsyncTask<Void, Integer, Void>() {
        int n = 1, t = 4000;
        boolean increaseN;

        @Override/*from  w  w w. j ava  2s .  c o  m*/
        protected Void doInBackground(Void... params) {
            while (!isCancelled()) {
                Date currentDate = new Date();
                long diffTime = currentDate.getTime() - firstTime;

                double y = getCosY(diffTime);
                int alpha = (int) (y * Color.alpha(color));
                int resultColor = setAlphaComponent(color, alpha);
                if (alpha < 0.038 * 255) {
                    publishProgress(0);
                    this.cancel(true);
                    return null;
                }
                publishProgress(resultColor, alpha);
                try {
                    Thread.sleep(38);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            view.setBackgroundColor(values[0]);
        }
    });
}