安卓中颜色选择器的使用教程 Android中颜色选择器和改变字体颜色的实例教程
by2n 人气:0想了解Android中颜色选择器和改变字体颜色的实例教程的相关内容吗，by2n在本文为您仔细讲解安卓中颜色选择器的使用教程的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：Android,ColorPicker,颜色选择器,安卓,字体,背景，下面大家一起来学习吧。
1.构建一张七彩图:
我们经常看到这种样子的颜色选择器吧..
然后其实右边的亮度选择是:
这样我们的代码就可以进行啦...
// 创建七彩图片
private void init() {
int[] oc = { 0xffff0000, 0xffffff00, 0xff00ff00, 0xff00ffff,
0xff0000ff, 0xffff00ff, 0xffff0000 };
float[] op = { 0, 0.16667f, 0.33333f, 0.5f, 0.66667f, 0.83333f, 1 };
LinearGradient lg = new LinearGradient(0, 0, ORIWIDTH, 0, oc, op,
TileMode.MIRROR);
LinearGradient lg2 = new LinearGradient(0, 0, 0, ORIHEIGHT, 0x00808080,
0xff808080, TileMode.MIRROR);
oriColor = Bitmap.createBitmap(ORIWIDTH, ORIHEIGHT, Config.ARGB_8888);
Canvas c = new Canvas(oriColor);
paint.setShader(lg);
c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint);
paint.setShader(lg2);
c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint);
}
// 右边的亮度栏
private void drawABar(Canvas c) {
int x, y;
x = (roundColor & 0x00ffffff);
y = (x | 0xff000000);
LinearGradient lg = new LinearGradient(0, 0, layoutWidth, 0, x, y,
TileMode.MIRROR);
// 初始化 x 240 + 6 * 2
y = ORIHEIGHT + (GAP << 2) - GAP + BARHEIGHT;
paint.setColor(0xffffffff);
c.drawBitmap(aBk, 0, y, paint);
paint.setShader(lg);
c.drawRect(0, y, layoutWidth, y + BARHEIGHT, paint);
}
其他屏幕事件什么的就不贴代码啦...
2.ColorPicker颜色选择器改变字体颜色实例：
（1）测试界面
（2）调色板对话框
（3）改变字体颜色
嗯好，来看代码：
package com.xsl.colorpicker;
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.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
public class ColorPickerDialog extends Dialog {
private final boolean debug = true;
private final String TAG = "ColorPicker";
Context context;
private String title; //标题
private int mInitialColor; //初始颜色
private OnColorChangedListener mListener;
/**
* 初始颜色黑色
* @param context
* @param title 对话框标题
* @param listener 回调
*/
public ColorPickerDialog(Context context, String title,
OnColorChangedListener listener) {
this(context, Color.BLACK, title, listener);
}
/**
*
* @param context
* @param initialColor 初始颜色
* @param title 标题
* @param listener 回调
*/
public ColorPickerDialog(Context context, int initialColor,
String title, OnColorChangedListener listener) {
super(context);
this.context = context;
mListener = listener;
mInitialColor = initialColor;
this.title = title;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WindowManager manager = getWindow().getWindowManager();
int height = (int) (manager.getDefaultDisplay().getHeight() * 0.38f); //0.5
int width = (int) (manager.getDefaultDisplay().getWidth() * 0.5f); //0.7
ColorPickerView myView = new ColorPickerView(context, height, width);
setContentView(myView);
setTitle(title);
}
private class ColorPickerView extends View {
private Paint mPaint; //渐变色环画笔
private Paint mCenterPaint; //中间圆画笔
private Paint mLinePaint; //分隔线画笔
private Paint mRectPaint; //渐变方块画笔
private Shader rectShader; //渐变方块渐变图像
private float rectLeft; //渐变方块左x坐标
private float rectTop; //渐变方块右x坐标
private float rectRight; //渐变方块上y坐标
private float rectBottom; //渐变方块下y坐标
private final int[] mCircleColors; //渐变色环颜色
private final int[] mRectColors; //渐变方块颜色
private int mHeight; //View高
private int mWidth; //View宽
private float r; //色环半径(paint中部)
private float centerRadius; //中心圆半径
private boolean downInCircle = true; //按在渐变环上
private boolean downInRect; //按在渐变方块上
private boolean highlightCenter; //高亮
private boolean highlightCenterLittle; //微亮
public ColorPickerView(Context context, int height, int width) {
super(context);
this.mHeight = height - 36;
this.mWidth = width;
setMinimumHeight(height - 36);
setMinimumWidth(width);
//渐变色环参数
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;
//中心圆参数
mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mCenterPaint.setColor(mInitialColor);
mCenterPaint.setStrokeWidth(5);
centerRadius = (r - mPaint.getStrokeWidth() / 2 ) * 0.7f;
//边框参数
mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mLinePaint.setColor(Color.parseColor("#72A1D1"));
mLinePaint.setStrokeWidth(4);
//黑白渐变参数
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;
}
@Override
protected void onDraw(Canvas canvas) {
//移动中心
canvas.translate(mWidth / 2, mHeight / 2 - 50);
//画中心圆
canvas.drawCircle(0, 0, centerRadius, mCenterPaint);
//是否显示中心圆外的小圆环
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);
}
//画色环
canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
//画黑白渐变块
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);//左
canvas.drawLine(rectLeft - offset * 2, rectTop - offset,
rectRight + offset * 2, rectTop - offset, mLinePaint);//上
canvas.drawLine(rectRight + offset, rectTop - offset * 2,
rectRight + offset, rectBottom + offset * 2, mLinePaint);//右
canvas.drawLine(rectLeft - offset * 2, rectBottom + offset,
rectRight + offset * 2, rectBottom + offset, mLinePaint);//下
super.onDraw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX() - mWidth / 2;
float y = event.getY() - mHeight / 2 + 50;
boolean inCircle = inColorCircle(x, y,
r + mPaint.getStrokeWidth() / 2, r - mPaint.getStrokeWidth() / 2);
boolean inCenter = inCenter(x, y, centerRadius);
boolean inRect = inRect(x, y);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downInCircle = inCircle;
downInRect = inRect;
highlightCenter = inCenter;
case MotionEvent.ACTION_MOVE:
if(downInCircle && inCircle) {//down按在渐变色环内, 且move也在渐变色环内
float angle = (float) Math.atan2(y, x);
float unit = (float) (angle / (2 * Math.PI));
if (unit < 0) {
unit += 1;
}
mCenterPaint.setColor(interpCircleColor(mCircleColors, unit));
if(debug) Log.v(TAG, "色环内, 坐标: " + x + "," + y);
}else if(downInRect && inRect) {//down在渐变方块内, 且move也在渐变方块内
mCenterPaint.setColor(interpRectColor(mRectColors, x));
}
if(debug) Log.v(TAG, "[MOVE] 高亮: " + highlightCenter + "微亮: " + highlightCenterLittle + " 中心: " + inCenter);
if((highlightCenter && inCenter) || (highlightCenterLittle && inCenter)) {//点击中心圆, 当前移动在中心圆
highlightCenter = true;
highlightCenterLittle = false;
} else if(highlightCenter || highlightCenterLittle) {//点击在中心圆, 当前移出中心圆
highlightCenter = false;
highlightCenterLittle = true;
} else {
highlightCenter = false;
highlightCenterLittle = false;
}
invalidate();
break;
case MotionEvent.ACTION_UP:
if(highlightCenter && inCenter) {//点击在中心圆, 且当前启动在中心圆
if(mListener != null) {
mListener.colorChanged(mCenterPaint.getColor());
ColorPickerDialog.this.dismiss();
}
}
if(downInCircle) {
downInCircle = false;
}
if(downInRect) {
downInRect = false;
}
if(highlightCenter) {
highlightCenter = false;
}
if(highlightCenterLittle) {
highlightCenterLittle = false;
}
invalidate();
break;
}
return true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(mWidth, mHeight);
}
/**
* 坐标是否在色环上
* @param x 坐标
* @param y 坐标
* @param outRadius 色环外半径
* @param inRadius 色环内半径
* @return
*/
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;
}
}
/**
* 坐标是否在中心圆上
* @param x 坐标
* @param y 坐标
* @param centerRadius 圆半径
* @return
*/
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;
}
}
/**
* 坐标是否在渐变色中
* @param x
* @param y
* @return
*/
private boolean inRect(float x, float y) {
if( x <= rectRight && x >=rectLeft && y <= rectBottom && y >=rectTop) {
return true;
} else {
return false;
}
}
/**
* 获取圆环上颜色
* @param colors
* @param unit
* @return
*/
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);
}
/**
* 获取渐变块上颜色
* @param colors
* @param x
* @return
*/
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));
}
}
/**
* 回调接口
*/
public interface OnColorChangedListener {
/**
* 回调函数
* @param color 选中的颜色
*/
void colorChanged(int color);
}
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;
}
public OnColorChangedListener getmListener() {
return mListener;
}
public void setmListener(OnColorChangedListener mListener) {
this.mListener = mListener;
}
}
测试界面
PaintDemoActivity.java
package com.xsl.colorpicker;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class PaintDemoActivity extends Activity {
Context context;
private Button btnColorPicker;
private TextView tvText;
private ColorPickerDialog dialog;
@Override
public void onCreate(Bundle savedInstanceState) {
context = this;
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initViews();
}
/**
* 初始化UI
*/
private void initViews() {
btnColorPicker = (Button) findViewById(R.id.button1);
btnColorPicker.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dialog = new ColorPickerDialog(context, tvText.getTextColors().getDefaultColor(),
getResources().getString(R.string.app_name),
new ColorPickerDialog.OnColorChangedListener() {
public void colorChanged(int color) {
tvText.setTextColor(color);
}
});
dialog.show();
}
});
tvText = (TextView) findViewById(R.id.tv);
}
}
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