标签：canvas 自定义 int float private mPaint VerticalSeekBar MySeekBar Android
如图：
1、自定义属性 res->values下创建attrs.xml文件
<!-- 仪表盘自定义属性 -->
<declare-styleable name="MySeekBar">
<!--背景颜色-->
<attr name="bgColor" format="color"/>
<!--进度颜色-->
<attr name="progressColor" format="color"/>
<!--当前进度-->
<attr name="progress" format="float"/>
<!--总进度-->
<attr name="maxProgress" format="float"/>
<!--是否显示小太阳-->
<attr name="showSun" format="boolean"/>
<!--是否缩放小太阳-->
<attr name="zoomSun" format="boolean"/>
<!--小太阳颜色-->
<attr name="sunColor" format="color"/>
<!--小太阳半径-->
<attr name="circleRadius" format="dimension"/>
<!--矩形圆角-->
<attr name="radiusXY" format="dimension"/>
<attr name="showText" format="boolean"/>
<attr name="setTextColor" format="color"/>
<attr name="setTextHeight" format="integer|dimension"/>
<attr name="setTextSize" format="dimension"/>
</declare-styleable>
2、自定义View
package com.example.customseekbar;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import com.example.customseekbar.utils.MyColorUtils;
public class MySeekBar extends View {
//背景颜色
private int bgColor;
//进度颜色
private int progressColor;
//当前进度
private float progress = 10;
//总进度
private float maxProgress = 100;
//当前UI高度与view高度的比例
private double progressRate = 0;
//记录按压时手指相对于组件view的高度
private float downY;
//手指移动的距离，视为亮度调整
private float moveDistance;
private Paint mPaint;//画笔
//是否画亮度路标
private boolean showSun = true;
//太阳颜色
private int sunColor;
//小太阳半径
private float circleRadius = 15;
//矩形圆角
private float radiusXY = 40;
//设置是否画亮度文字
private boolean showText = true;
//文字位置
private int textHeight = -1;
//字体大写
private float textSize = 15;
//字体颜色
private int textColor = Color.BLACK;
//显示内容
private String textContent = "";
//是否缩放小太阳
private boolean isSunZoom = true;
//亮度图标margin
private int margin = 10;
public MySeekBar(Context context) {
this(context,null);
}
public MySeekBar(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public MySeekBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initAttrs(context, attrs);
}
private void initAttrs(Context context, AttributeSet attrs) {
textSize = sp2px(context,textSize);
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MySeekBar);
bgColor = typedArray.getColor(R.styleable.MySeekBar_bgColor, ContextCompat.getColor(getContext(),R.color.bg_color));
progressColor = typedArray.getColor(R.styleable.MySeekBar_progressColor,ContextCompat.getColor(getContext(),R.color.progress_color));
progress = typedArray.getFloat(R.styleable.MySeekBar_progress, 10);
maxProgress = typedArray.getFloat(R.styleable.MySeekBar_maxProgress, 100);
showSun = typedArray.getBoolean(R.styleable.MySeekBar_showSun,showSun);
isSunZoom = typedArray.getBoolean(R.styleable.MySeekBar_zoomSun,isSunZoom);
sunColor = typedArray.getColor(R.styleable.MySeekBar_sunColor,ContextCompat.getColor(getContext(),R.color.sun_color));
circleRadius = typedArray.getDimension(R.styleable.MySeekBar_circleRadius, circleRadius);
radiusXY = typedArray.getDimension(R.styleable.MySeekBar_radiusXY, radiusXY);
showText = typedArray.getBoolean(R.styleable.MySeekBar_showText,showText);
textColor = typedArray.getColor(R.styleable.MySeekBar_setTextColor,textColor);
textHeight = typedArray.getInt(R.styleable.MySeekBar_setTextHeight,textHeight);
textSize = typedArray.getDimension(R.styleable.MySeekBar_setTextSize,textSize);
typedArray.recycle();
initPaint();
}
private void initPaint() {
//获取当前百分比率
progressRate = getProgressRate();
//背景画笔
mPaint = new Paint();
mPaint.setAntiAlias(true);//抗锯齿
mPaint.setDither(true);//设置防抖动
mPaint.setColor(bgColor);
mPaint.setStyle(Paint.Style.FILL);
mPaint.setStrokeWidth(0);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setTextSize(textSize);
}
public int getProgress(){
return (int)progress;
}
public void setProgress(int mProgress){
progress = mProgress;
progressRate = getProgressRate();
invalidate();
}
/**
* 计算亮度比例
*/
private double getProgressRate(){
return (double) progress / maxProgress;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//保存
int layerId = canvas.saveLayer(0, 0, canvas.getWidth(), canvas.getHeight(), null, Canvas.ALL_SAVE_FLAG);
onDrawBackground(canvas); //画背景
onDrawProgress(canvas); //画进度
onDrawText(canvas); //画文字
onDrawSunCircle(canvas);//画小太郎
//恢复到特定的保存点
canvas.restoreToCount(layerId);
}
/**
* 画圆弧背景
* @param canvas
*/
private void onDrawBackground(Canvas canvas){
mPaint.setStyle(Paint.Style.FILL);
mPaint.setColor(bgColor);
int with = getWidth();
int height = getHeight();
// int colors [] = new int[2];
// //colors[0] = Color.parseColor("#FFB660");
// //colors[1] = Color.parseColor("#FFA757");
// colors[0] = setColorTempToColor("6500K");
// colors[1] = setColorTempToColor("2700K");
// //线性变色
// float heightkkk = (canvas.getHeight()-(int)(canvas.getHeight() * progressRate));
// LinearGradient linearGradient = new LinearGradient((canvas.getWidth()/2),heightkkk,(canvas.getWidth()/2),0,colors,null, Shader.TileMode.CLAMP);
// //new float[]{},中的数据表示相对位置，将150,50,150,300，划分10个单位，.3，.6，.9表示它的绝对位置。300到400，将直接画出rgb（0,232,210）
// mPaint.setShader(linearGradient);
RectF rectF = new RectF(0,0,with,height);
canvas.drawRoundRect(rectF,radiusXY,radiusXY,mPaint);
}
/**
* 画亮度背景-方形-随手势上下滑动而变化用来显示亮度大小
* @param canvas
*/
private void onDrawProgress(Canvas canvas){
mPaint.setStyle(Paint.Style.FILL);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP));
int with = getWidth();
int height = getHeight();
// int colors [] = new int[2];
// //colors[0] = Color.parseColor("#FFB660");
// //colors[1] = Color.parseColor("#FFA757");
// colors[0] = setColorTempToColor("6500K");
// colors[1] = setColorTempToColor("2700K");
// //线性变色
// float heightkkk = (canvas.getHeight()-(int)(canvas.getHeight() * progressRate));
// LinearGradient linearGradient = new LinearGradient((canvas.getWidth()/2),heightkkk,(canvas.getWidth()/2),height,colors,null, Shader.TileMode.CLAMP);
// //new float[]{},中的数据表示相对位置，将150,50,150,300，划分10个单位，.3，.6，.9表示它的绝对位置。300到400，将直接画出rgb（0,232,210）
// mPaint.setShader(linearGradient);
mPaint.setColor(progressColor);
Log.i("打印比率：","progressRate = "+progressRate);
float progressHeight = (canvas.getHeight()-(int)(canvas.getHeight() * progressRate));
canvas.drawRect(0,progressHeight,with,height,mPaint);
mPaint.setXfermode(null);
}
/**
* 画文字-展示当前大小
* @param canvas
*/
private void onDrawText(Canvas canvas){
if(showText) { //如果开启了则开始绘制
mPaint.setStyle(Paint.Style.FILL);
textContent = "" + (int) (progressRate * 100);
mPaint.setColor(textColor);
canvas.drawText(textContent, (canvas.getWidth() / 2 - mPaint.measureText(textContent) / 2), textHeight >= 0 ? textHeight : getHeight() / 6, mPaint);
}
}
/**
* 画亮度图标-太阳圆心
*/
private void onDrawSunCircle(Canvas canvas){
if(showSun){ //如果开启了则开始绘制
mPaint.setStyle(Paint.Style.FILL);
mPaint.setStrokeWidth(4);
mPaint.setColor(sunColor);
if (isSunZoom){//是否缩放太阳圆点
float circleMaxRadius = (float) (Math.sqrt(canvas.getWidth()) * 1.5);
float circleMinRadius = (float) (Math.sqrt(canvas.getWidth()) * 1);
//当前圆半径
circleRadius = (float) progressRate * (circleMaxRadius - circleMinRadius) + circleMinRadius;
canvas.drawCircle(canvas.getWidth()/2,(float) (canvas.getHeight() * 0.85 - margin), circleRadius,mPaint);
onDrawSunRays(canvas,canvas.getWidth()/2,(float) (canvas.getHeight() * 0.85 - margin));
}else {
canvas.drawCircle(canvas.getWidth()/2,(float) (canvas.getHeight() * 0.85), circleRadius,mPaint);
onDrawSunRays(canvas,canvas.getWidth()/2,(float) (canvas.getHeight() * 0.85));
}
}
}
/**
* 画亮度图标-太阳光芒
*/
private void onDrawSunRays(Canvas canvas,float cx,float cy){
mPaint.setStrokeCap(Paint.Cap.ROUND); // 定义线段断电形状为圆头
//绘制时刻度
canvas.translate(cx,cy);
for (int i = 0; i < 10; i++) {
if (isSunZoom){//是否缩放
canvas.drawLine(circleRadius, circleRadius, (float)(circleRadius + 5 * progressRate),(float)( circleRadius + 5* progressRate), mPaint);
}else {
canvas.drawLine(circleRadius, circleRadius, (float)(circleRadius + 5),(float)( circleRadius + 5), mPaint);
}
canvas.rotate(36);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
downY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
moveDistance = downY - event.getY();
//计算手指移动后亮度UI占比大小
calculateLoudRate();
downY = event.getY();
if (listener != null) {
listener.onProgressChange((int)(progressRate*100));
}
break;
case MotionEvent.ACTION_UP:
break;
}
invalidate();
return true;
}
/**
* 计算手指移动后亮度UI占比大小，视其为亮度大小
*/
private void calculateLoudRate(){
progressRate = ( getHeight() * progressRate + moveDistance) / getHeight();
if(progressRate >= 1){
progressRate = 1;
}
if(progressRate <= 0){
progressRate = 0;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
margin = MeasureSpec.getSize(widthMeasureSpec)/10;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
//附加
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
}
//分离，拆卸
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dp2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
/**
* 将sp值转换为px值，保证文字大小不变
*/
public int sp2px(Context context, float spValue) {
final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
//进度发生变化的回调接口
interface OnProgressChangedListener {
void onProgressChange(int progress);
}
public void setOnProgressChangedListener(OnProgressChangedListener listener) {
this.listener = listener;
}
//进度移动监听
private OnProgressChangedListener listener = null;
private int setColorTempToColor(String color){
String zhi = color.replace("K", "");
Log.i("打印色温值：",""+zhi);
int rgb [] = new int[3];
rgb = MyColorUtils.getRgbFromTemperature(Double.valueOf(zhi),false);
Log.i("打印色温值转颜色：","R=${rgb[0]} ,G=${rgb[1]} ,B=${rgb[2]}");
int c = Color.argb(255,rgb[0], rgb[1], rgb[2]);
Log.i("打印选择的值3","c=${c}");
//返回颜色
return c;
}
}
3、布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FF00"
tools:context=".MySeekBarActivity">
<com.example.customseekbar.MySeekBar
android:id="@+id/my_seekbar"
android:layout_width="100dp"
android:layout_height="300dp"
app:progress="60"
app:maxProgress="100"
app:bgColor="@color/bg_color"
app:progressColor="@color/progress_color"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"></com.example.customseekbar.MySeekBar>
<TextView
android:id="@+id/tv_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text=""
android:textSize="16sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/my_seekbar"></TextView>
</androidx.constraintlayout.widget.ConstraintLayout>
4、activity
public class MySeekBarActivity extends AppCompatActivity {
private MySeekBar mySeekBar;
private TextView tvValue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_seek_bar);
tvValue = findViewById(R.id.tv_value);
mySeekBar = findViewById(R.id.my_seekbar);
mySeekBar.setOnProgressChangedListener(new MySeekBar.OnProgressChangedListener() {
@Override
public void onProgressChange(int progress) {
tvValue.setText(""+progress);
//tvValue.setText(""+(2700+(6500-2700)/100*progress));
}
});
//设置默认
mySeekBar.setProgress(90);
tvValue.setText(""+mySeekBar.getProgress());
}
}
完成
标签：canvas,自定义,int,float,private,mPaint,VerticalSeekBar,MySeekBar,Android 来源： https://www.cnblogs.com/changyiqiang/p/16559445.html
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