我已经在http://www.yougli.net/android/a-photoshop-like-color-picker-for-your-android-application/
上学习了一个教程但是找不到如何创建/启动此对话框的方法...任何想法？
下面的课程代码。
谢谢！ ：）
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);
}
// 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(getResources().getString(R.string.settings_bg_color_confirm), 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(getResources().getString(R.string.settings_default_color_confirm), 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) {
mListener.colorChanged(mKey, color);
dismiss();
}
};
setContentView(new ColorPickerView(getContext(), l, mInitialColor, mDefaultColor));
setTitle(R.string.settings_bg_color_dialog);
}
}
答案 0 :(得分：1)
显示它的代码应该是这样的：
ColorPickerDialog dialog = new ColorPickerDialog(context, this, 0);
dialog.show();
编辑：我在一个用于选择偏好的类中使用了它。该类扩展了Preference并实现了OnClickListener和OnColorChangedListener，因此ColorPickerDialog构造函数参数是context - 您必须传递给它的应用程序上下文（有几种方法可以获取应用程序上下文，例如活动中的getApplicationContext（））; 'this'是对OnColorChangedListener的引用（因为调用ColorPickerDialog的类实现了这个接口，但它可能是一个单独的类），最后，0是初始颜色的值。
答案 1 :(得分：1)
new ColorPickerDialog(
this,
new ColorPickerDialog.OnColorChangedListener() {
@Override
public void colorChanged(int color) {
//you change your color when the color is changed in the dialog
myColor = color;
}
},
Color.BLACK).show();