Android自定义环形LoadingView效果

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。