我想在我开发的应用程序中的活动上添加颜色选择器。我不会和对话。它将出现在活动的内容上。当我触摸颜色选择器圆的表面时，它将返回RGB十六进制值。
不管怎样，下面有一些代码可以满足我提到的需求。当我在安卓4.4.2上运行该应用程序，manifest.xml上的行为Android:minSdkVersion="9"时，我可以清楚地看到圆圈。但是，当我在manifest.xml上运行android:minSdkVersion="14"行的应用程序时，活动中显示的是黑白（大部分是黑色）颜色选择器圆圈，而不是彩色圆圈。同样奇怪的是，当我触摸圆圈时，它会像彩色圆圈一样返回正确的值。例如，当我触摸黑色时，它会返回0XFF000000（红色）。
我的错在哪里？我该怎么处理？请帮帮我。
布局xml；
...
<com.(package name).ColourPicker
android:id="@+id/colourPick"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
...
java类；
public class ColourPicker extends View {
private static final float PI = 3.1415926f;
private int[] mCoord;
private float[] mHSV;
private MainActivity ourContext;
private static int CENTER_X;
private static int CENTER_Y;
private static int HUE_RADIUS;
private static int INNER_RADIUS;
private static int PALETTE_RADIUS;
private static int SAT_RADIUS;
public boolean colourKnown = false;
int[] mSpectrumColorsRev = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,
0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000, };
Paint mOvalHue;
Paint mOvalHueInner;
Paint mOvalSat;
RectF mRectSat;
Paint mArcSat;
Paint mPaintSatTextRect;
Paint mPaintSatText;
Paint mPosMarker;
RectF posMarkerRect1;
RectF posMarkerRect2;
Shader shaderA;
Shader shaderB;
Shader shaderHue;
Shader shaderSat;
public ColourPicker(Context context, AttributeSet attr) {
super(context, attr);
ourContext = (MainActivity) context;
DisplayMetrics metrics = new DisplayMetrics();
WindowManager wm = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
wm.getDefaultDisplay().getMetrics(metrics);
double scalefactor;
if (metrics.widthPixels < metrics.heightPixels) {
scalefactor = 2.5;
} else {
scalefactor = 5.5;
}
CENTER_X = (int) (1 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// / 2);
CENTER_Y = (int) (1 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// / 2);
HUE_RADIUS = (int) (1 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// / 6)
// -
// (metrics.heightPixels
// /
// 45);
// //110;
INNER_RADIUS = (int) (0.63 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// /
// 10.5);
// //70;
PALETTE_RADIUS = (int) (1 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// /
// 6)
// -
// (metrics.heightPixels
// /
// 45);
// //110;;
SAT_RADIUS = (int) (0.60 * (metrics.widthPixels / scalefactor));// (metrics.heightPixels
// /
// 10.5)
// -5;
// //65;*/
mOvalHue = new Paint(Paint.ANTI_ALIAS_FLAG);
mOvalHueInner = new Paint(Paint.ANTI_ALIAS_FLAG);
mOvalSat = new Paint(Paint.ANTI_ALIAS_FLAG);
mRectSat = new RectF(-SAT_RADIUS, -SAT_RADIUS, SAT_RADIUS, SAT_RADIUS);
mArcSat = new Paint();
mPosMarker = new Paint(Paint.ANTI_ALIAS_FLAG);
shaderA = new SweepGradient(0, 0, mSpectrumColorsRev, null);
shaderB = new RadialGradient(CENTER_X, CENTER_Y, HUE_RADIUS,
0xFFFFFFFF, 0xFF000000, Shader.TileMode.CLAMP);
shaderHue = new ComposeShader(shaderA, shaderB, PorterDuff.Mode.SCREEN);
shaderSat = new RadialGradient(CENTER_X, CENTER_Y, SAT_RADIUS,
0xFF888888, 0xFFFFFFFF, Shader.TileMode.CLAMP);
// InitialisePaints Paints
mOvalHue.setShader(shaderHue);
mOvalHue.setStyle(Paint.Style.FILL);
mOvalHue.setDither(true);
mOvalSat.setShader(shaderSat);
mOvalSat.setStyle(Paint.Style.FILL);
mOvalSat.setDither(true);
mOvalSat.setColor(0xFFFFFFFF);
mArcSat.setAntiAlias(true);
mArcSat.setStyle(Paint.Style.FILL);
mArcSat.setColor(0xFFFFFFFF);
mPosMarker.setStyle(Paint.Style.STROKE);
mPosMarker.setStrokeWidth(2);
mPaintSatTextRect = new Paint();
mPaintSatTextRect.setAntiAlias(true);
mPaintSatTextRect.setStyle(Paint.Style.FILL);
mPaintSatTextRect.setColor(0XFF000000);
mPaintSatText = new Paint();
mPaintSatText.setAntiAlias(true);
mPaintSatText.setStyle(Paint.Style.FILL);
mPaintSatText.setColor(0xFFFFFFFF);
mPaintSatText.setTextSize(25);
mCoord = new int[2];
mHSV = new float[3];
mHSV[1] = 1;
posMarkerRect1 = new RectF(mCoord[0] - 5, mCoord[1] - 5, mCoord[0] + 5,
mCoord[1] + 5);
posMarkerRect2 = new RectF(mCoord[0] - 3, mCoord[1] - 3, mCoord[0] + 3,
mCoord[1] + 3);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.translate(CENTER_X, CENTER_Y);
canvas.drawCircle(0, 0, HUE_RADIUS, mOvalHue);
canvas.drawCircle(0, 0, INNER_RADIUS, mOvalHueInner);
// Sat up
canvas.drawArc(mRectSat, (float) 182, (float) 176, true, mOvalSat);
canvas.drawArc(mRectSat, (float) 182, (float) 176, true, mArcSat);
// Sat down
canvas.drawArc(mRectSat, (float) 2, (float) 176, true, mOvalSat);
canvas.drawArc(mRectSat, (float) 2, (float) 176, true, mArcSat);
canvas.drawRect(-(SAT_RADIUS - 10), 15, (SAT_RADIUS - 10), -15,
mPaintSatTextRect);
mPaintSatText.setColor(0xFFFFFFFF);
mPaintSatText.setTextSize(25);
String satStr = "Saturation";
canvas.drawText(satStr, -60, 8, mPaintSatText);
mPaintSatText.setTextSize(35);
mPaintSatText.setColor(0xFF000000);
satStr = "+";
canvas.drawText(satStr, -8, -30, mPaintSatText);
satStr = "-";
canvas.drawText(satStr, -8, 50, mPaintSatText);
if (colourKnown) {
posMarkerRect1.set(mCoord[0] - 5, mCoord[1] - 5, mCoord[0] + 5,
mCoord[1] + 5);
posMarkerRect2.set(mCoord[0] - 3, mCoord[1] - 3, mCoord[0] + 3,
mCoord[1] + 3);
mPosMarker.setColor(Color.BLACK);
canvas.drawOval(posMarkerRect1, mPosMarker);
mPosMarker.setColor(Color.WHITE);
canvas.drawOval(posMarkerRect2, mPosMarker);
}
}
// Currently Fixed size
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(CENTER_X * 2, CENTER_Y * 2);
}
public void drawPortraite() {
invalidate();
}
// Weighted average between points
private int ave(int s, int d, float p) {
return s + java.lang.Math.round(p * (d - s));
}
// Interpolate colour value between points
private int interpColor(int colors[], float unit) {
if (unit <= 0) {
return colors[0];
}
if (unit >= 1) {
return colors[colors.length - 1];
}
float p = unit * (colors.length - 1);
int i = (int) p;
p -= i;
// now p is just the fractional part [0...1] and i is the index
int c0 = colors[i];
int c1 = colors[i + 1];
int a = ave(Color.alpha(c0), Color.alpha(c1), p);
int r = ave(Color.red(c0), Color.red(c1), p);
int g = ave(Color.green(c0), Color.green(c1), p);
int b = ave(Color.blue(c0), Color.blue(c1), p);
System.out.println("the vaient is" + b);
return Color.argb(a, r, g, b);
}
private int round(double x) {
return (int) Math.round(x);
}
public void upDateColorPreivew(byte hue, byte sat) {
// update hue preview
float unit = (float) hue / 255;
if (unit < 0) {
unit += 1;
}
unit = 1 - unit;
int c = interpColor(mSpectrumColorsRev, unit);
mArcSat.setColor(c);
// update sat preview
mArcSat.setAlpha(sat);
colourKnown = true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled())
return false;
float x = event.getX() - CENTER_X;
float y = event.getY() - CENTER_Y;
float angle = (float) java.lang.Math.atan2(y, x);
// need to turn angle [-PI ... PI] into unit [0....1]
float unit = angle / (2 * PI);
if (unit < 0) {
unit += 1;
}
// Pin the radius
float radius = (float) java.lang.Math.sqrt(x * x + y * y);
if (radius > PALETTE_RADIUS)
radius = PALETTE_RADIUS;
if (radius < INNER_RADIUS) {
// User adjusted saturation
if (angle < 0) {
// + Sat
if ((mHSV[1] + 0.10) <= 1) {
mHSV[1] += 0.10;
} else {
mHSV[1] = 1;
}
} else {
// - Sat
if ((mHSV[1] - 0.10) >= 0) {
mHSV[1] -= 0.10;
} else {
mHSV[1] = 0;
}
}
byte hue = (byte) ((mHSV[0] / 360) * 255);
byte sat = (byte) (mHSV[1] * 254);
ourContext.sendHueSatChange(hue, sat);
// update preview
mArcSat.setAlpha((byte) (mHSV[1] * 254));
} else {
// User adjusted hue
mCoord[0] = round(Math.cos(angle)
* (HUE_RADIUS - (HUE_RADIUS - INNER_RADIUS) / 2));
mCoord[1] = round(Math.sin(angle)
* (HUE_RADIUS - (HUE_RADIUS - INNER_RADIUS) / 2));
int c = interpColor(mSpectrumColorsRev, unit);
float[] hsv = new float[3];
Color.colorToHSV(c, hsv);
mHSV[0] = hsv[0];
colourKnown = true;
// Update color
byte hue = (byte) ((mHSV[0] / 360) * 255);
byte sat = (byte) (mHSV[1] * 254);
ourContext.sendHueSatChange(hue, sat);
// update preview
mArcSat.setColor(c);
mArcSat.setAlpha((int) (mHSV[1] * 255));
}
invalidate();
return true;
}
}
我刚刚通过将manifest.xml的应用程序标记添加到下面的行中来解决问题；
android:hardwareAccelerated="false"
链接中的相关句子-http://developer.android.com/guide/topics/graphics/hardware-accel.html#controlling；
"…如果您的应用程序仅使用标准视图和Drawables，全局启用它不会对绘图产生任何不利影响。但是，由于并非所有2D绘图操作都支持硬件加速，因此启用它可能会影响一些自定义视图或绘图调用。"