小编给大家分享一下Android如何自定义带动画的半圆环型进度效果，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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;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" />以上是“Android如何自定义带动画的半圆环型进度效果”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注编程网行业资讯频道！
