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 
 

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 
 

可以自定义的属性:

调用:

main_activity.xml:

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脚本之家。