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2019-03-15
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摘要：本文将带你了解Android应用开发Android 可滚动圆形进度条 滑块和进度在进度条上面跟着滚动，希望本文对大家学Android有所帮助。
本文将带你了解Android应用开发Android 可滚动圆形进度条 滑块和进度在进度条上面跟着滚动，希望本文对大家学Android有所帮助。
Android 可滚动圆形进度条 滑块和进度在进度条上面跟着滚动。package com.example.test;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PointF;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class MusicProgressBar extends View{
/**
* 画笔对象的引用
*/
private Paint paint;
/**
* 圆环的颜色
*/
private int roundColor;
/**
* 圆环进度的颜色
*/
private int roundProgressColor;
/**
* 圆环的宽度
*/
private float roundWidth;
/**
* 最大进度
*/
private int max;
/**
* 当前进度
*/
private int progress;
/**
* 中间进度百分比的字符串的颜色
*/
private int textColor;
/**
* 中间进度百分比的字符串的字体
*/
private float textSize;
/**
* 点的半径
*/
private float pointRadius;
/**
* 空心点的宽度
*/
private float pointWidth;
private Drawable mThumb, mThumbPress;
public MusicProgressBar(Context context) {
this(context, null);
}
public MusicProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public MusicProgressBar(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
paint = new Paint();
//TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.RoundProgressBar);
//获取自定义属性和默认值
roundColor =Color.RED;//
mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor,
Color.RED);
roundProgressColor =Color.GREEN;// mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor,
Color.GREEN);
roundWidth =3;//
mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 3);
textColor =Color.BLACK;//
mTypedArray.getColor(R.styleable.RoundProgressBar_textColor,
Color.GREEN);
textSize =8;//
mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
max =100;// mTypedArray.getInteger(R.styleable.RoundProgressBar_imageMax,
100);
pointRadius =3;// mTypedArray.getDimension(R.styleable.RoundProgressBar_pointRadius,
3);
pointWidth =2;//
mTypedArray.getDimension(R.styleable.RoundProgressBar_pointWidth, 2);
// mTypedArray.recycle();
// 加载拖动图标
mThumb = getResources().getDrawable(R.drawable.ic_launcher);// 圆点图片
int thumbHalfheight = mThumb.getIntrinsicHeight() / 2;
int thumbHalfWidth = mThumb.getIntrinsicWidth() / 2;
mThumb.setBounds(-thumbHalfWidth, -thumbHalfheight, thumbHalfWidth,
thumbHalfheight);
mThumbPress = getResources().getDrawable(R.drawable.ic_launcher);//
圆点图片
thumbHalfheight = mThumbPress.getIntrinsicHeight() / 2;
thumbHalfWidth = mThumbPress.getIntrinsicWidth() / 2;
mThumbPress.setBounds(-thumbHalfWidth, -thumbHalfheight, thumbHalfWidth,
thumbHalfheight);
paddingOuterThumb = thumbHalfheight*2;
}
@Override
public void onDraw(Canvas canvas) {
/**
* 画最外层的大圆环
*/
paint.setColor(roundColor); //设置圆环的颜色
paint.setStyle(Paint.Style.STROKE); //设置空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setAntiAlias(true); //消除锯齿
canvas.drawCircle(centerX, centerY, radius, paint); //画出圆环
/**
* 画文字
*/
paint.setStrokeWidth(0);
paint.setColor(textColor);
paint.setTextSize(textSize);
// paint.setTypeface(Typeface.DEFAULT); //设置字体
String textTime = getTimeText(progress);
float textWidth = paint.measureText(textTime); //测量字体宽度，我们需要根据字体的宽度设置在圆环中间
// canvas.drawText(textTime, centerX - textWidth / 2, centerY + textSize/2,
paint);
/**
* 画圆弧 ，画圆环的进度
*/
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setColor(roundProgressColor); //设置进度的颜色
RectF oval = new RectF(centerX - radius, centerY - radius, centerX +
radius, centerY + radius); //用于定义的圆弧的形状和大小的界限
paint.setStyle(Paint.Style.STROKE);
canvas.drawArc(oval, 270, 360 * progress / max, false, paint);
//根据进度画圆弧
// 画圆上的两个点
paint.setStrokeWidth(pointWidth);
PointF startPoint = ChartUtil.calcArcEndPointXY(centerX, centerY, radius,
0, 270);
canvas.drawCircle(startPoint.x, startPoint.y, pointRadius, paint);
//paint.setStyle(Paint.Style.FILL_AND_STROKE);
PointF progressPoint = ChartUtil.calcArcEndPointXY(centerX, centerY,
radius, 360 * progress / max, 270);
//canvas.drawCircle(progressPoint.x, progressPoint.y, pointRadius,
paint);
// 画Thumb
canvas.save();
canvas.translate((float)(progressPoint.x+15*Math.sin(360 * progress /
max*0.0174533f)), (float)(progressPoint.y-15*Math.cos(360 * progress /
max*0.0174533f)));
canvas.rotate(360 * progress / max);
if (downOnArc) {
mThumbPress.draw(canvas);
} else {
mThumb.draw(canvas);
}
canvas.restore();
paint.setStrokeWidth(0);
paint.setColor(textColor);
paint.setTextSize(textSize);
// paint.setTypeface(Typeface.DEFAULT); //设置字体
// String textTime = getTimeText(progress);
// float textWidth = paint.measureText(textTime);
progress-=5;
canvas.rotate(360*(progress+5) / max,
(float)(progressPoint.x+26f*Math.sin(360 * progress /
max*0.0174533f)),(float)(progressPoint.y-26f*Math.cos(360 * progress /
max*0.0174533f)));
canvas.drawText(textTime,(float)(progressPoint.x+26f*Math.sin(360 *
progress / max*0.0174533f)),(float)(progressPoint.y-26f*Math.cos(360 *
progress / max*0.0174533f)), paint);
canvas.rotate(-360*(progress+5) / max, progressPoint.x,
progressPoint.y);
progress+=5;
}
private boolean downOnArc = false;
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
int x = (int) event.getX();
int y = (int) event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
if (isTouchArc(x, y)) {
downOnArc = true;
updateArc(x, y);
return true;
}
break;
case MotionEvent.ACTION_MOVE:
if (downOnArc) {
updateArc(x, y);
return true;
}
break;
case MotionEvent.ACTION_UP:
downOnArc = false;
invalidate();
if (changeListener != null) {
changeListener.onProgressChangeEnd(max, progress);
}
break;
}
return super.onTouchEvent(event);
}
private int centerX, centerY;
private int radius;
private int paddingOuterThumb;
@Override
protected void onSizeChanged(int width, int height, int oldw, int oldh)
{
centerX = width / 2;
centerY = height / 2;
int minCenter = Math.min(centerX, centerY);
radius = (int) (minCenter - roundWidth/2 - paddingOuterThumb);
//圆环的半径
minValidateTouchArcRadius = (int) (radius - paddingOuterThumb*1.5f);
maxValidateTouchArcRadius = (int) (radius + paddingOuterThumb*1.5f);
super.onSizeChanged(width, height, oldw, oldh);
}
// 根据点的位置，更新进度
private void updateArc(int x, int y) {
int cx = x - getWidth() / 2;
int cy = y - getHeight() / 2;
// 计算角度，得出(-1->1)之间的数据，等同于(-180°->180°)
double angle = Math.atan2(cy, cx)/Math.PI;
// 将角度转换成(0->2)之间的值，然后加上90°的偏移量
angle = ((2 + angle)%2 + (90/180f))%2;
// 用(0->2)之间的角度值乘以总进度，等于当前进度
progress = (int) (angle * max/2);
if (changeListener != null) {
changeListener.onProgressChange(max, progress);
}
invalidate();
}
private int minValidateTouchArcRadius; // 最小有效点击半径
private int maxValidateTouchArcRadius; // 最大有效点击半径
// 判断是否按在圆边上
private boolean isTouchArc(int x, int y) {
double d = getTouchRadius(x, y);
if (d >= minValidateTouchArcRadius && d <=
maxValidateTouchArcRadius) {
return true;
}
return false;
}
// 计算某点到圆点的距离
private double getTouchRadius(int x, int y) {
int cx = x - getWidth() / 2;
int cy = y - getHeight() / 2;
return Math.hypot(cx, cy);
}
private String getTimeText(int progress) {
int minute = progress / 60;
int second = progress % 60;
String result = (minute < 10 ? 0 : ) + minute + : + (second < 10 ? 0
: ) + second;
return result;
}
public synchronized int getMax() {
return max;
}
/**
* 设置进度的最大值
* @param max
*/
public synchronized void setMax(int max) {
if(max < 0){
throw new IllegalArgumentException(max not less than 0);
}
this.max = max;
}
/**
* 获取进度.需要同步
* @return
*/
public synchronized int getProgress() {
return progress;
}
/**
* 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
* 刷新界面调用postInvalidate()能在非UI线程刷新
* @param progress
*/
public synchronized void setProgress(int progress) {
if(progress < 0){
throw new IllegalArgumentException(progress not less than 0);
}
if(progress > max){
progress = max;
}
if(progress <= max){
this.progress = progress;
postInvalidate();
}
}
public int getCricleColor() {
return roundColor;
}
public void setCricleColor(int cricleColor) {
this.roundColor = cricleColor;
}
public int getCricleProgressColor() {
return roundProgressColor;
}
public void setCricleProgressColor(int cricleProgressColor) {
this.roundProgressColor = cricleProgressColor;
}
public float getRoundWidth() {
return roundWidth;
}
public void setRoundWidth(float roundWidth) {
this.roundWidth = roundWidth;
}
public static class ChartUtil {
/**
* 依圆心坐标，半径，扇形角度，计算出扇形终射线与圆弧交叉点的xy坐标
* @param cirX
* @param cirY
* @param radius
* @param cirAngle
* @return
*/
public static PointF calcArcEndPointXY(float cirX, float cirY, float
radius, float cirAngle){
float posX = 0.0f;
float posY = 0.0f;
//将角度转换为弧度
float arcAngle = (float) (Math.PI * cirAngle / 180.0);
if (cirAngle < 90)
{
posX = cirX + (float)(Math.cos(arcAngle)) * radius;
posY = cirY + (float)(Math.sin(arcAngle)) * radius;
}
else if (cirAngle == 90)
{
posX = cirX;
posY = cirY + radius;
}
else if (cirAngle > 90 && cirAngle < 180)
{
arcAngle = (float) (Math.PI * (180 - cirAngle) / 180.0);
posX = cirX - (float)(Math.cos(arcAngle)) * radius;
posY = cirY + (float)(Math.sin(arcAngle)) * radius;
}
else if (cirAngle == 180)
{
posX = cirX - radius;
posY = cirY;
}
else if (cirAngle > 180 && cirAngle < 270)
{
arcAngle = (float) (Math.PI * (cirAngle - 180) / 180.0);
posX = cirX - (float)(Math.cos(arcAngle)) * radius;
posY = cirY - (float)(Math.sin(arcAngle)) * radius;
}
else if (cirAngle == 270)
{
posX = cirX;
posY = cirY - radius;
}
else
{
arcAngle = (float) (Math.PI * (360 - cirAngle) / 180.0);
posX = cirX + (float)(Math.cos(arcAngle)) * radius;
posY = cirY - (float)(Math.sin(arcAngle)) * radius;
}
return new PointF(posX, posY);
}
public static PointF calcArcEndPointXY(float cirX, float cirY, float
radius, float cirAngle, float orginAngle){
cirAngle = (orginAngle + cirAngle) % 360;
return calcArcEndPointXY(cirX, cirY, radius, cirAngle);
}
}
private OnProgressChangeListener changeListener;
public void setChangeListener(OnProgressChangeListener changeListener)
{
this.changeListener = changeListener;
}
public interface OnProgressChangeListener {
void onProgressChange(int duration, int progress);
void onProgressChangeEnd(int duration, int progress);
}
}
本文由职坐标整理并发布，希望对同学们有所帮助。了解更多详情请关注职坐标移动开发之Android频道！
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