最近项目有要用到环形的进度条,Github上有一个类似的DashedCircularProgress控件,但是他画的进度是通过设置画笔的虚线效果来实现间隔的:progressPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));如果内层还有一层圆环,在动态设置时,内层和外层有细微的偏差.于是我在原有基础上改了一个,实现了我要的效果(设置进度时可以选择加动画或者不加动画):

控件实现:

这个控件继承RelativeLayout,在onDraw时做了两件事:

1、先画出底部的黑色环形;
2、按照当时的进度值画出对应比例的外层绿色环形.

对外提供一个接口,回调当前进度值:

public interface OnValueChangeListener { void onValueChange(float value);}

核心绘制类:

InternalCirclePainterImp2,绘制内层的黑色的环形:

/** * @author Chuck */public class InternalCirclePainterImp2 implements InternalCirclePainter { private RectF internalCircle;//画出圆弧时,圆弧的外切矩形 private Paint internalCirclePaint; private int color; private float startAngle = 270f; int arcQuantity=100;//等分(圆弧加间隔),比如arcQuantity=100时,表示将有100个圆弧,和100个空白间隔 float ratio=0.5f;//每段圆弧与圆弧加间隔之和的比例,ratio=0.5表示每个圆弧与相邻的间隔弧度比是1:1 private int width; private int height; private int internalStrokeWidth = 48;//圆环宽度 public InternalCirclePainterImp2(int color, int progressStrokeWidth, int arcQuantity,float ratio) { this.color = color; this.internalStrokeWidth = progressStrokeWidth; this.arcQuantity = arcQuantity; if(ratio>0&&ratio<1){ this.ratio = ratio; } init(); } private void init() { initExternalCirclePainter(); } private void initExternalCirclePainter() { internalCirclePaint = new Paint(); internalCirclePaint.setAntiAlias(true); internalCirclePaint.setStrokeWidth(internalStrokeWidth); internalCirclePaint.setColor(color); internalCirclePaint.setStyle(Paint.Style.STROKE); } //圆弧外切矩形 private void initExternalCircle() { internalCircle = new RectF(); float padding = internalStrokeWidth * 0.5f; internalCircle.set(padding, padding , width - padding, height - padding); initExternalCirclePainter(); } @Override public void draw(Canvas canvas) { float eachAngle=360f/arcQuantity; float eachArcAngle=eachAngle*ratio; for(int i=0;i<arcQuantity*2;i++){ if(i%2==0){//遇到偶数就画圆弧,基数则跳过 canvas.drawArc(internalCircle, startAngle+eachAngle*i/2, eachArcAngle, false, internalCirclePaint); } else{ continue; } } } public void setColor(int color) { this.color = color; internalCirclePaint.setColor(color); } @Override public int getColor() { return color; } @Override public void onSizeChanged(int height, int width) { this.width = width; this.height = height; initExternalCircle(); }}

ProgressPainterImp2,绘制内层的黑色的环形:

/** * @author Chuck */public class ProgressPainterImp2 implements ProgressPainter { private RectF progressCircle; private Paint progressPaint; private int color = Color.RED; private float startAngle = 270f; private int internalStrokeWidth = 48; private float min; private float max; private int width; private int height; private int currentPecent;//当前的百分比 int arcQuantity=100;//等分(圆弧加间隔),比如arcQuantity=100时,表示将有100个圆弧,和100个空白间隔 float ratio=0.5f;//每段圆弧与圆弧加间隔之和的比例,ratio=0.5表示每个圆弧与相邻的间隔弧度比是1:1 public ProgressPainterImp2(int color, float min, float max, int progressStrokeWidth, int arcQuantity,float ratio) { this.color = color; this.min = min; this.max = max; this.internalStrokeWidth = progressStrokeWidth; this.arcQuantity = arcQuantity; this.ratio = ratio; init(); Log.e("ProgressPainterImp","构造函数执行"); } private void init() { initInternalCirclePainter(); } private void initInternalCirclePainter() { progressPaint = new Paint(); progressPaint.setAntiAlias(true); progressPaint.setStrokeWidth(internalStrokeWidth); progressPaint.setColor(color); progressPaint.setStyle(Paint.Style.STROKE); } //初始化外切的那个矩形 private void initInternalCircle() { progressCircle = new RectF(); float padding = internalStrokeWidth * 0.5f; progressCircle.set(padding, padding , width - padding, height - padding); initInternalCirclePainter(); } @Override public void draw(Canvas canvas) { float eachAngle=360f/arcQuantity; float eachArcAngle=eachAngle*ratio; int quantity=2*arcQuantity*currentPecent/100; for(int i=0;i<quantity;i++){ if(i%2==0){//遇到偶数就画圆弧,基数则跳过 canvas.drawArc(progressCircle, startAngle+eachAngle*i/2, eachArcAngle, false, progressPaint); } else{ continue; } } } public float getMin() { return min; } public void setMin(float min) { this.min = min; } public float getMax() { return max; } public void setMax(float max) { this.max = max; } public void setValue(float value) { this.currentPecent = (int) (( 100f * value) / max); } @Override public void onSizeChanged(int height, int width) { Log.e("ProgressPainterImp","onSizeChanged执行"); this.width = width; this.height = height; initInternalCircle(); } public int getColor() { return color; } public void setColor(int color) { this.color = color; progressPaint.setColor(color); }}

可以自定义的属性:

<declare-styleable name="CircularLoadingView"> <attr name="base_color" format="color" /> <!--内层圆环的颜色--> <attr name="progress_color" format="color" /><!--进度圆环的颜色--> <attr name="max" format="float" /><!--最小值--> <attr name="min" format="float" /><!--最大值--> <attr name="duration" format="integer" /><!--动画时长--> <attr name="progress_stroke_width" format="integer" /><!--圆环宽度--> <!--等分(圆弧加间隔),比如arcQuantity=100时,表示将有100个圆弧,和100个空白间隔--> <attr name="argQuantity" format="integer" /> <!--每段圆弧与圆弧加间隔之和的比例,ratio=0.5表示每个圆弧与相邻的间隔弧度比是1:1--> <attr name="ratio" format="float" /></declare-styleable>

调用:

main_activity.xml:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" xmlns:custom="http://schemas.android.com/apk/res-auto" android:background="#ffffff" > <!--自定义控件,继承RelativeLayout--> <qdong.com.mylibrary.CircularLoadingView android:id="@+id/simple" custom:base_color="@color/pager_bg" custom:min="0" custom:max="100" custom:argQuantity="100" custom:ratio="0.6" custom:progress_color="@android:color/holo_green_light" custom:progress_icon="@mipmap/ic_launcher" custom:duration="1000" custom:progress_stroke_width="28" android:layout_centerInParent="true" android:layout_width="200dp" android:layout_height="200dp"> <RelativeLayout android:layout_centerInParent="true" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_centerInParent="true" android:textSize="20sp" android:layout_centerHorizontal="true" android:id="@+id/number" android:text="0" android:gravity="center" android:textColor="@color/pager_bg" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout> </qdong.com.mylibrary.CircularLoadingView> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Set_Value" android:id="@+id/button" android:layout_alignParentBottom="true" android:layout_alignParentStart="true"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Animation" android:id="@+id/button3" android:layout_alignTop="@+id/button" android:layout_alignParentEnd="true"/></RelativeLayout>

MainActivity:

findViewById(R.id.button).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { try { mDashedCircularProgress.setValue(66);//没有动画的,直接设置 } catch (Exception e) { e.printStackTrace(); } }});findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { try { mDashedCircularProgress.setValue(0);//无动画,归零 mDashedCircularProgress.setValueWithAnimation(100,2000);//带动画 } catch (Exception e) { e.printStackTrace(); } }});

Github地址:https://github.com/506954774/AndroidCircularLoadingView

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。