============问题描述============
我用网上的ColorPickerDialog控件改成了View控件，希望把ColorPicker控件直接嵌入到layout内，在layout设计界面可以看到View已经显示了，但在MainActivity内使用SetContentView调用后就报错，请大侠帮我查下哪里写得不对；
package com.example.colorpicker;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.view.View;
public class ColorPickerView extends View {
private Paint mPaint;//
private Paint mCenterPaint;//
private Paint mLinePaint;//
private Paint mRectPaint;//
private Shader rectShader;//
private float rectLeft;//
private float rectTop;//
private float rectRight;//
private float rectBottom;//
private final boolean debug = true;
private final String TAG = "ColorPicker";
Context context;
private String title;//
private int mInitialColor;//
// private OnColorChangedListener mListener;
private final int[] mCircleColors;//
private final int[] mRectColors;//
private int mHeight;//
private int mWidth;//
private float r;//
private float centerRadius;//
private boolean downInCircle = true;//
private boolean downInRect;//
private boolean highlightCenter;//
private boolean highlightCenterLittle;//
// public ColorPickerView(Context context, int height, int width) {
public ColorPickerView(Context context) {
super(context);
int height = 400;
int width = 500;
this.mHeight = height - 36;
this.mWidth = width;
setMinimumHeight(height - 36);
setMinimumWidth(width);
mCircleColors = new int[] {0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,
0xFF00FFFF, 0xFF00FF00,0xFFFFFF00, 0xFFFF0000};
Shader s = new SweepGradient(0, 0, mCircleColors, null);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setShader(s);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(50);
r = width / 2 * 0.7f - mPaint.getStrokeWidth() * 0.5f;
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(mInitialColor);
mCenterPaint.setStrokeWidth(5);
centerRadius = (r - mPaint.getStrokeWidth() / 2 ) * 0.7f;
mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mLinePaint.setColor(Color.parseColor("#72A1D1"));
mLinePaint.setStrokeWidth(4);
mRectColors = new int[]{0xFF000000, mCenterPaint.getColor(), 0xFFFFFFFF};
mRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mRectPaint.setStrokeWidth(5);
rectLeft = -r - mPaint.getStrokeWidth() * 0.5f;
rectTop = r + mPaint.getStrokeWidth() * 0.5f +
mLinePaint.getStrokeMiter() * 0.5f + 15;
rectRight = r + mPaint.getStrokeWidth() * 0.5f;
rectBottom = rectTop + 50;
}
private void init()
{
}
@Override
protected void onDraw(Canvas canvas) {
canvas.translate(mWidth / 2, mHeight / 2 - 50);
canvas.drawCircle(0, 0, centerRadius, mCenterPaint);
if (highlightCenter || highlightCenterLittle) {
int c = mCenterPaint.getColor();
mCenterPaint.setStyle(Paint.Style.STROKE);
if(highlightCenter) {
mCenterPaint.setAlpha(0xFF);
}else if(highlightCenterLittle) {
mCenterPaint.setAlpha(0x90);
}
canvas.drawCircle(0, 0,
centerRadius + mCenterPaint.getStrokeWidth(), mCenterPaint);
mCenterPaint.setStyle(Paint.Style.FILL);
mCenterPaint.setColor(c);
}
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
if(downInCircle) {
mRectColors[1] = mCenterPaint.getColor();
}
rectShader = new LinearGradient(rectLeft, 0, rectRight, 0, mRectColors, null, Shader.TileMode.MIRROR);
mRectPaint.setShader(rectShader);
canvas.drawRect(rectLeft, rectTop, rectRight, rectBottom, mRectPaint);
float offset = mLinePaint.getStrokeWidth() / 2;
canvas.drawLine(rectLeft - offset, rectTop - offset * 2,
rectLeft - offset, rectBottom + offset * 2, mLinePaint);//?·|
canvas.drawLine(rectLeft - offset * 2, rectTop - offset,
rectRight + offset * 2, rectTop - offset, mLinePaint);//???
canvas.drawLine(rectRight + offset, rectTop - offset * 2,
rectRight + offset, rectBottom + offset * 2, mLinePaint);//??3
canvas.drawLine(rectLeft - offset * 2, rectBottom + offset,
rectRight + offset * 2, rectBottom + offset, mLinePaint);//???
super.onDraw(canvas);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(mWidth, mHeight);
}
private boolean inColorCircle(float x, float y, float outRadius, float inRadius) {
double outCircle = Math.PI * outRadius * outRadius;
double inCircle = Math.PI * inRadius * inRadius;
double fingerCircle = Math.PI * (x * x + y * y);
if(fingerCircle < outCircle && fingerCircle > inCircle) {
return true;
}else {
return false;
}
}
private boolean inCenter(float x, float y, float centerRadius) {
double centerCircle = Math.PI * centerRadius * centerRadius;
double fingerCircle = Math.PI * (x * x + y * y);
if(fingerCircle < centerCircle) {
return true;
}else {
return false;
}
}
private boolean inRect(float x, float y) {
if( x <= rectRight && x >=rectLeft && y <= rectBottom && y >=rectTop) {
return true;
} else {
return false;
}
}
private int interpCircleColor(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);
return Color.argb(a, r, g, b);
}
private int interpRectColor(int colors[], float x) {
int a, r, g, b, c0, c1;
float p;
if (x < 0) {
c0 = colors[0];
c1 = colors[1];
p = (x + rectRight) / rectRight;
} else {
c0 = colors[1];
c1 = colors[2];
p = x / rectRight;
}
a = ave(Color.alpha(c0), Color.alpha(c1), p);
r = ave(Color.red(c0), Color.red(c1), p);
g = ave(Color.green(c0), Color.green(c1), p);
b = ave(Color.blue(c0), Color.blue(c1), p);
return Color.argb(a, r, g, b);
}
private int ave(int s, int d, float p) {
return s + Math.round(p * (d - s));
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getmInitialColor() {
return mInitialColor;
}
public void setmInitialColor(int mInitialColor) {
this.mInitialColor = mInitialColor;
}
}
============解决方案1============
看看错误log是什么，就知道哪里错了。
============解决方案2============
你能把相应layout的XML文件贴出来么
============解决方案3============
异常很明显是没有构造函数。
public ColorPickerView(Context context, AttributeSet attributeSet)
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
============解决方案4============
public ColorPickerView(Context context, AttributeSet attributeSet) {
this.ColorPickerView(context);//这样写
}
============解决方案5============
public ColorPickerView(Context context, AttributeSet attributeSet) {
super(context,attributeSet);
ColorPickerView(context);//...................................
}
ColorPickerView(context) 你不是说你写了这个构造函数了么。