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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！
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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