Android中颜色选择器和改变字体颜色的实例教程
短信预约 -IT技能 免费直播动态提醒
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;
public ColorPickerDialog(Context context, String title,
OnColorChangedListener listener) {
this(context, Color.BLACK, title, listener);
}
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);
}
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 interface OnColorChangedListener {
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();
}
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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