Android自訂環形LoadingView效果-H5教程-PHP中文網

這篇文章主要為大家詳細介紹了Android自訂環形LoadingView效果的方法，具有一定的參考價值，有興趣的小夥伴們可以參考一下

最近專案有要用到環形的進度條,Github上有一個類似的DashedCircularProgress控制,但是他畫的進度是透過設定畫筆的虛線效果來實現間隔的:progressPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));如果內層還有一層圓環,在動態設定時,內層和外層有細微的偏差.於是我在原有基礎上改了一個,實現了我要的效果(設定進度時可以選擇加動畫或不加動畫):

控制實作：

這個控制項繼承RelativeLayout,在onDraw時做了兩件事:

1、先畫出底部的黑色環形;
2、按照當時的進度值畫出對應比例的外層綠色環形.

對外提供一個接口,回調當前進度值:

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

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核心繪製類別:

InternalCirclePainterImp2,繪製內層的黑色的環形:

/**
 * @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();
  }
}

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ProgressPainterImp2,繪製內層的黑色的環形:

/**
 * @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);
  }
}

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#可以自訂的屬性:

<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>

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#呼叫:

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>

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#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();
    }
  }
});

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

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