Android自定义带动画的半圆环型进度效果

本文实例为大家分享了Android半圆环型进度效果的具体代码，供大家参考，具体内容如下

package com.newair.ondrawtext;

import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.OvershootInterpolator;

/**
* Created by ouhimehime on 16/6/15.
* --------自定义控件-------
*/
public class CustomView extends View {

//画笔
 private Paint paint;
 private RectF oval;

//圆弧颜色
 private int roundColor;
 //进度颜色
 private int progressColor;
 //文字内容
 private boolean textIsShow;
 //字体大小
 private float textSize = 14;
 //文字颜色
 private int textColor;
 //最大进度
 private int max = 1000;
 //当前进度
 private int progress = 300;
 //圆弧宽度
 private int roundWidth = 30;

private int viewWidth; //宽度--控件所占区域

private float nowPro = 0;//用于动画

private ValueAnimator animator;

public CustomView(Context context) {
   super(context);
 }

public CustomView(Context context, AttributeSet attrs) {
   super(context, attrs);
   initAttrs(attrs, context);
 }

public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
   super(context, attrs, defStyleAttr);
   initAttrs(attrs, context);
 }

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public CustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
   super(context, attrs, defStyleAttr, defStyleRes);
   initAttrs(attrs, context);
 }

private void initAttrs(AttributeSet attr, Context context) {
   TypedArray array = context.obtainStyledAttributes(attr, R.styleable.CustomView);

roundColor = array.getColor(R.styleable.CustomView_roundColor, Color.BLACK);//环形颜色
   progressColor = array.getColor(R.styleable.CustomView_progressColor, Color.RED);//进度颜色
   textIsShow = array.getBoolean(R.styleable.CustomView_textIsShow, false);//文字
   textSize = array.getDimension(R.styleable.CustomView_textSize, 14);//文字大小
   textColor = array.getColor(R.styleable.CustomView_textColor, Color.BLACK);//文字颜色
   roundWidth = array.getInt(R.styleable.CustomView_roundWidth, 30);//圆环宽度

array.recycle();

//动画
   animator = ValueAnimator.ofFloat(0, progress);
   animator.setDuration(1800);
   animator.setInterpolator(new OvershootInterpolator());
   animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
     @Override
     public void onAnimationUpdate(ValueAnimator animation) {
       nowPro = (float) animation.getAnimatedValue();
       postInvalidate();
     }
   });
   animator.start();

}

@Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
   final int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);

if (widthSpecMode == MeasureSpec.AT_MOST) {//可获得最大空间
     setMeasuredDimension(widthMeasureSpec, (widthSpecSize / 2) + (int) (Math.cos(20) * (widthSpecSize / 2)));
   } else if (widthMeasureSpec == MeasureSpec.EXACTLY) {//一般指精确值
     setMeasuredDimension(widthMeasureSpec, (widthSpecSize / 2) + (int) (Math.cos(20) * (widthSpecSize / 2)));
   } else {
     setMeasuredDimension(widthMeasureSpec, (viewWidth / 2) + (int) (Math.cos(20) * (viewWidth / 2)));
   }
 }

@Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
   super.onSizeChanged(w, h, oldw, oldh);

viewWidth = w;//得到宽度以此来计算控件所占实际大小

//计算画布所占区域
   oval = new RectF();
   oval.left = roundWidth + getPaddingLeft();
   oval.top = roundWidth + getPaddingTop();
   oval.right = viewWidth - roundWidth - getPaddingRight();
   oval.bottom = viewWidth - roundWidth - getPaddingBottom();

}

@Override
 protected void onDraw(Canvas canvas) {
   super.onDraw(canvas);

Paint paint = new Paint();
   paint.setAntiAlias(true);            //设置画笔为无锯齿
   paint.setColor(roundColor);           //设置画笔颜色
   paint.setStrokeWidth(roundWidth);        //线宽
   paint.setStyle(Paint.Style.STROKE);       //空心
   canvas.drawArc(oval, 160, 220, false, paint);  //绘制圆弧

//画进度层
   paint.setColor(progressColor);
   paint.setStrokeWidth(roundWidth + 1);
   canvas.drawArc(oval, 160, 220 * nowPro / max, false, paint); //绘制圆弧

if (textIsShow) {
     paint.setColor(textColor);
     paint.setStrokeWidth(0);
     paint.setTypeface(Typeface.DEFAULT);
     paint.setTextSize(textSize * 2);
     float textWidth = paint.measureText((int) ((nowPro / (float) max) * 100) + "％");
     canvas.drawText((int) ((nowPro / (float) max) * 100) + "％", viewWidth / 2 - textWidth / 2, viewWidth / 2, paint);
   }

}

private int getDefaultHeight() {
   return 0;
 }

private int getDefaultWidth() {
   return 0;
 }

public int getRoundColor() {
   return roundColor;
 }

public void setRoundColor(int roundColor) {
   this.roundColor = roundColor;
 }

public int getProgressColor() {
   return progressColor;
 }

public void setProgressColor(int progressColor) {
   this.progressColor = progressColor;
 }

public boolean getText() {
   return textIsShow;
 }

public void setText(boolean text) {
   this.textIsShow = text;
 }

public float getTextSize() {
   return textSize;
 }

public void setTextSize(float textSize) {
   this.textSize = textSize;
 }

public int getTextColor() {
   return textColor;
 }

public void setTextColor(int textColor) {
   this.textColor = textColor;
 }

public int getMax() {
   return max;
 }

public void setMax(int max) {
   this.max = max;
 }

public int getProgress() {
   return progress;
 }

public void setProgress(int progress) {
   this.progress = progress;
 }
}

自定义属性

<declare-styleable name="CustomView">
   <attr name="roundColor" format="color" />
   <attr name="progressColor" format="color" />
   <attr name="textIsShow" format="boolean" />
   <attr name="textSize" format="dimension" />
   <attr name="textColor" format="color" />
   <attr name="roundWidth" format="integer" />
 </declare-styleable>

用法

<com.newair.ondrawtext.CustomView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:visibility="visible"
   app:progressColor="@android:color/holo_orange_dark"
   app:roundColor="@android:color/holo_blue_dark"
   app:roundWidth="45"
   app:textColor="@android:color/black"
   app:textIsShow="true"
   app:textSize="14sp" />