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The source code is released under:
GNU General Public License
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package com.motioncoding.miband.view; // w w w .ja v a2 s. c om import android.R; import android.app.Dialog; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Shader; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; public class ColorPickerDialog extends Dialog { public interface OnColorChangedListener { void colorChanged(String key, int color); } private OnColorChangedListener mListener; private int mInitialColor, mDefaultColor; private String mKey; private static class ColorPickerView extends View { private Paint mPaint; private float mCurrentHue = 0; private int mCurrentX = 0, mCurrentY = 0; private int mCurrentColor, mDefaultColor; private final int[] mHueBarColors = new int[258]; private int[] mMainColors = new int[65536]; private OnColorChangedListener mListener; ColorPickerView(Context c, OnColorChangedListener l, int color, int defaultColor) { super(c); mListener = l; mDefaultColor = defaultColor; // Get the current hue from the current color and update the main // color field float[] hsv = new float[3]; Color.colorToHSV(color, hsv); mCurrentHue = hsv[0]; updateMainColors(); mCurrentColor = color; // Initialize the colors of the hue slider bar int index = 0; for (float i = 0; i < 256; i += 256 / 42) // Red (#f00) to pink // (#f0f) { mHueBarColors[index] = Color.rgb(255, 0, (int) i); index++; } for (float i = 0; i < 256; i += 256 / 42) // Pink (#f0f) to blue // (#00f) { mHueBarColors[index] = Color.rgb(255 - (int) i, 0, 255); index++; } for (float i = 0; i < 256; i += 256 / 42) // Blue (#00f) to light // blue (#0ff) { mHueBarColors[index] = Color.rgb(0, (int) i, 255); index++; } for (float i = 0; i < 256; i += 256 / 42) // Light blue (#0ff) to // green (#0f0) { mHueBarColors[index] = Color.rgb(0, 255, 255 - (int) i); index++; } for (float i = 0; i < 256; i += 256 / 42) // Green (#0f0) to yellow // (#ff0) { mHueBarColors[index] = Color.rgb((int) i, 255, 0); index++; } for (float i = 0; i < 256; i += 256 / 42) // Yellow (#ff0) to red // (#f00) { mHueBarColors[index] = Color.rgb(255, 255 - (int) i, 0); index++; } // Initializes the Paint that will draw the View mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setTextAlign(Paint.Align.CENTER); mPaint.setTextSize(12); } // Get the current selected color from the hue bar private int getCurrentMainColor() { int translatedHue = 255 - (int) (mCurrentHue * 255 / 360); int index = 0; for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb(255, 0, (int) i); index++; } for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb(255 - (int) i, 0, 255); index++; } for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb(0, (int) i, 255); index++; } for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb(0, 255, 255 - (int) i); index++; } for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb((int) i, 255, 0); index++; } for (float i = 0; i < 256; i += 256 / 42) { if (index == translatedHue) return Color.rgb(255, 255 - (int) i, 0); index++; } return Color.RED; } // Update the main field colors depending on the current selected hue private void updateMainColors() { int mainColor = getCurrentMainColor(); int index = 0; int[] topColors = new int[256]; for (int y = 0; y < 256; y++) { for (int x = 0; x < 256; x++) { if (y == 0) { mMainColors[index] = Color.rgb( 255 - (255 - Color.red(mainColor)) * x / 255, 255 - (255 - Color.green(mainColor)) * x / 255, 255 - (255 - Color.blue(mainColor)) * x / 255); topColors[x] = mMainColors[index]; } else mMainColors[index] = Color.rgb( (255 - y) * Color.red(topColors[x]) / 255, (255 - y) * Color.green(topColors[x]) / 255, (255 - y) * Color.blue(topColors[x]) / 255); index++; } } } @Override protected void onDraw(Canvas canvas) { int translatedHue = 255 - (int) (mCurrentHue * 255 / 360); // Display all the colors of the hue bar with lines for (int x = 0; x < 256; x++) { // If this is not the current selected hue, display the actual // color if (translatedHue != x) { mPaint.setColor(mHueBarColors[x]); mPaint.setStrokeWidth(1); } else // else display a slightly larger black line { mPaint.setColor(Color.BLACK); mPaint.setStrokeWidth(3); } canvas.drawLine(x + 10, 0, x + 10, 40, mPaint); // canvas.drawLine(0, x+10, 40, x+10, mPaint); } // Display the main field colors using LinearGradient for (int x = 0; x < 256; x++) { int[] colors = new int[2]; colors[0] = mMainColors[x]; colors[1] = Color.BLACK; Shader shader = new LinearGradient(0, 50, 0, 306, colors, null, Shader.TileMode.REPEAT); mPaint.setShader(shader); canvas.drawLine(x + 10, 50, x + 10, 306, mPaint); } mPaint.setShader(null); // Display the circle around the currently selected color in the // main field if (mCurrentX != 0 && mCurrentY != 0) { mPaint.setStyle(Paint.Style.STROKE); mPaint.setColor(Color.BLACK); canvas.drawCircle(mCurrentX, mCurrentY, 10, mPaint); } // Draw a 'button' with the currently selected color mPaint.setStyle(Paint.Style.FILL); mPaint.setColor(mCurrentColor); canvas.drawRect(10, 316, 138, 356, mPaint); // Set the text color according to the brightness of the color if (Color.red(mCurrentColor) + Color.green(mCurrentColor) + Color.blue(mCurrentColor) < 384) mPaint.setColor(Color.WHITE); else mPaint.setColor(Color.BLACK); canvas.drawText("bg", 74, 340, mPaint); // Draw a 'button' with the default color mPaint.setStyle(Paint.Style.FILL); mPaint.setColor(mDefaultColor); canvas.drawRect(138, 316, 266, 356, mPaint); // Set the text color according to the brightness of the color if (Color.red(mDefaultColor) + Color.green(mDefaultColor) + Color.blue(mDefaultColor) < 384) mPaint.setColor(Color.WHITE); else mPaint.setColor(Color.BLACK); canvas.drawText("def", 202, 340, mPaint); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(276, 366); } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() != MotionEvent.ACTION_DOWN) return true; float x = event.getX(); float y = event.getY(); // If the touch event is located in the hue bar if (x > 10 && x < 266 && y > 0 && y < 40) { // Update the main field colors mCurrentHue = (255 - x) * 360 / 255; updateMainColors(); // Update the current selected color int transX = mCurrentX - 10; int transY = mCurrentY - 60; int index = 256 * (transY - 1) + transX; if (index > 0 && index < mMainColors.length) mCurrentColor = mMainColors[256 * (transY - 1) + transX]; // Force the redraw of the dialog invalidate(); } // If the touch event is located in the main field if (x > 10 && x < 266 && y > 50 && y < 306) { mCurrentX = (int) x; mCurrentY = (int) y; int transX = mCurrentX - 10; int transY = mCurrentY - 60; int index = 256 * (transY - 1) + transX; if (index > 0 && index < mMainColors.length) { // Update the current color mCurrentColor = mMainColors[index]; // Force the redraw of the dialog invalidate(); } } // If the touch event is located in the left button, notify the // listener with the current color if (x > 10 && x < 138 && y > 316 && y < 356) mListener.colorChanged("", mCurrentColor); // If the touch event is located in the right button, notify the // listener with the default color if (x > 138 && x < 266 && y > 316 && y < 356) mListener.colorChanged("", mDefaultColor); return true; } } public ColorPickerDialog(Context context, OnColorChangedListener listener, String key, int initialColor, int defaultColor) { super(context); mListener = listener; mKey = key; mInitialColor = initialColor; mDefaultColor = defaultColor; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); OnColorChangedListener l = new OnColorChangedListener() { public void colorChanged(String key, int color) { if (mListener != null) mListener.colorChanged(mKey, color); dismiss(); } }; setContentView(new ColorPickerView(getContext(), l, mInitialColor, mDefaultColor)); setTitle("Set LED Color"); } }