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Android 自定义圆环

Android 自定义圆环

作者: 因为我的心 | 来源:发表于2020-12-26 15:42 被阅读0次

一、前言:

最近公司有个需求,需要自定义圆环的颜色和进度,效果图如下:


效果图.png

1、创建类,继承view,重写onDraw和onMesure方法

public class CirclePercentBar extends View {
    private Context mContext;
    private int mArcColor;
    private int mArcWidth;
    private int mCenterTextColor;
    private int mCenterTextSize;
    private int mCircleRadius;
    private Paint arcPaint;
    private Paint arcCirclePaint;
    private Paint centerTextPaint;
    private RectF arcRectF;
    private Rect textBoundRect;
    private float mCurData=0;
    private int arcStartColor;
    private int arcEndColor;
    private Paint startCirclePaint;
    public CirclePercentBar(Context context) {
        this(context, null);
    }
    public CirclePercentBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public CirclePercentBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext=context;
        //color_FFEBEEF5
        TypedArray typedArray=context.obtainStyledAttributes(attrs, R.styleable.CirclePercentBar,defStyleAttr,0);
        mArcColor = typedArray.getColor(R.styleable.CirclePercentBar_arcColor,0xff0000);
        mArcWidth = typedArray.getDimensionPixelSize(R.styleable.CirclePercentBar_arcWidth, DisplayUtil.dp2px(context, 20));
        mCenterTextColor = typedArray.getColor(R.styleable.CirclePercentBar_centerTextColor, 0x0000ff);
        mCenterTextSize = typedArray.getDimensionPixelSize(R.styleable.CirclePercentBar_centerTextSize, DisplayUtil.dp2px(context, 20));
        mCircleRadius = typedArray.getDimensionPixelSize(R.styleable.CirclePercentBar_circleRadius, DisplayUtil.dp2px(context, 100));
        arcStartColor = typedArray.getColor(R.styleable.CirclePercentBar_arcStartColor,
                ContextCompat.getColor(mContext, R.color.color_FFF9612D));
        arcEndColor = typedArray.getColor(R.styleable.CirclePercentBar_arcEndColor,
                ContextCompat.getColor(mContext, R.color.color_FF58C89E));
        typedArray.recycle();
        initPaint();
    }
    private void initPaint() {
        startCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        startCirclePaint.setStyle(Paint.Style.FILL);
        //startCirclePaint.setStrokeWidth(mArcWidth);
        startCirclePaint.setColor(arcStartColor);
        arcCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        arcCirclePaint.setStyle(Paint.Style.STROKE);
        arcCirclePaint.setStrokeWidth(mArcWidth);
        //底部默认的圆环色   color_FFF96857 color_FFEBEEF5
        arcCirclePaint.setColor(ContextCompat.getColor(mContext,R.color.color_FFF96857));
        arcCirclePaint.setStrokeCap(Paint.Cap.ROUND);
        arcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        arcPaint.setStyle(Paint.Style.STROKE);
        arcPaint.setStrokeWidth(mArcWidth);
        arcPaint.setColor(mArcColor);
        arcPaint.setStrokeCap(Paint.Cap.ROUND);
        centerTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        centerTextPaint.setStyle(Paint.Style.STROKE);
        centerTextPaint.setColor(mCenterTextColor);
        centerTextPaint.setTextSize(mCenterTextSize);
        //圓弧的外接矩形
        arcRectF = new RectF();
        //文字的边界矩形
        textBoundRect = new Rect();
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(measureDimension(widthMeasureSpec),measureDimension(heightMeasureSpec));
    }
    private int measureDimension(int measureSpec) {
        int result;
        int specMode=MeasureSpec.getMode(measureSpec);
        int specSize=MeasureSpec.getSize(measureSpec);
        if(specMode==MeasureSpec.EXACTLY){
            result=specSize;
        }else{
            result=mCircleRadius*2;
            if(specMode==MeasureSpec.AT_MOST){
                result=Math.min(result,specSize);
            }
        }
        return result;
    }
    @Override
    protected void onDraw(Canvas canvas) {
        canvas.rotate(-90, getWidth()/ 2, getHeight()/ 2);
        arcRectF.set(getWidth()/2-mCircleRadius+mArcWidth/2,getHeight()/2-mCircleRadius+mArcWidth/2
                ,getWidth()/2+mCircleRadius-mArcWidth/2,getHeight()/2+mCircleRadius-mArcWidth/2);
        canvas.drawArc(arcRectF, 0,360,false,arcCirclePaint);
        arcPaint.setShader(new SweepGradient(getWidth()/2,getHeight()/2,arcStartColor,arcEndColor));
        canvas.drawArc(arcRectF, 0,360* mCurData /100,false,arcPaint);
        canvas.rotate(90, getWidth()/ 2, getHeight()/ 2);
        canvas.drawCircle(getWidth()/2,getHeight()/2-mCircleRadius+mArcWidth/2,mArcWidth/2,startCirclePaint);
        String data= String.valueOf(mCurData) +"%";
        centerTextPaint.getTextBounds(data,0,data.length(),textBoundRect);
        canvas.drawText(data,getWidth()/2-textBoundRect.width()/2,getHeight()/2+textBoundRect.height()/2,centerTextPaint);
    }
    public void setPercentData(float data, TimeInterpolator interpolator){
        ValueAnimator valueAnimator=ValueAnimator.ofFloat(mCurData,data);
        valueAnimator.setDuration((long) (Math.abs(mCurData-data)*30));
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                float value= (float) valueAnimator.getAnimatedValue();
                mCurData=(float)(Math.round(value*10))/10;
                invalidate();
            }
        });
        valueAnimator.setInterpolator(interpolator);
        valueAnimator.start();
    }
}

2、其中需要用到的类

public class DisplayUtil {
  public static int px2dp(Context context,float pxValue){
    final float scale=context.getResources().getDisplayMetrics().density;
    return (int)(pxValue/scale+0.5f);
  }
  public static int dp2px(Context context,float dpValue){
    final float scale=context.getResources().getDisplayMetrics().density;
    return (int)(dpValue*scale+0.5f);
  }
}

3、attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="CirclePercentBar">
    <attr name="arcColor" format="color"/>
    <attr name="arcWidth" format="dimension"/>
    <attr name="centerTextColor" format="color"/>
    <attr name="centerTextSize" format="dimension"/>
    <attr name="circleRadius" format="dimension"/>
    <attr name="arcStartColor" format="color"/>
    <attr name="arcEndColor" format="color"/>
  </declare-styleable>
</resources>

4、在activity_main里面写布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:orientation="vertical" android:layout_width="match_parent"
  android:layout_height="match_parent">
  <com.example.administrator.textc.CirclePercentBar
    android:id="@+id/circle_bar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:layout_gravity="center_horizontal"
    app:arcWidth="30dp"
    app:circleRadius="100dp"
    app:centerTextSize="30sp"
    app:arcColor="@color/colorPrimary"
    app:centerTextColor="@color/colorAccent"
    app:arcStartColor="@android:color/holo_green_light"/>
  <Button
    android:id="@+id/start_btn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="随机"/>
</LinearLayout>

5、编程实现效果:

public class MainActivity extends AppCompatActivity {
  CirclePercentBar circlePercentBar;
  Button startBtn;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    circlePercentBar= (CirclePercentBar) findViewById(R.id.circle_bar);
    circlePercentBar.setPercentData(55.2f,new DecelerateInterpolator());
    startBtn= (Button) findViewById(R.id.start_btn);
    startBtn.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        circlePercentBar.setPercentData((float) (100*Math.random()),new DecelerateInterpolator());
      }
    });
  }
}

参考链接:https://www.jb51.net/article/144732.htm

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