[置顶] 模仿小米安全中心检测效果（进度条效果）

模仿小米安全中心检测效果

废话少说，咱们先上效果图：

github地址： https://github.com/niniloveyou/GradeProgressView

欢迎前去点个赞（star）



这个效果的使用场景并不多，主要是各种检测的时候，比如垃圾清理，手机安全检测， 当然如果你不嫌弃这个效果丑， 也可以用作进度条。哈哈。

下面说点干货分析下这个效果怎么实现：

拿到这个效果首先想想主要有哪些技术难点：

1.进度条

2.中间的指针怎么弄

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1.进度条

有人说进度条还不容易吗？ 就这样写：

mPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, 。。。));

canvas.drawArc(mRectF, 135, 270, false, mPaint);
mPaint.setColor(Color.WHITE);
canvas.drawArc(mRectF, 135, degree, false, mPaint);

设置个PathEffect

然后画个圆弧，给画笔设置颜色然后根据进度，算出角度， 然后再画出一个圆弧，覆盖第一个圆弧的部分不就行了。废话这么多。

不过我想说的too young too simple. 当时我也是这样想的，于是就实现吧！ 做好了先画个50% （也就是第二个圆弧覆盖第一个圆弧的一半）试试，不错啊perfect看来是这样的， 再来个30%试试尼玛不对啊， 怎么小格子没有重合，有点错位啊。MDZZ

后来想了一个简单点的办法，不覆盖，画两个圆弧， 但是这两个圆弧是对接起来的。 比如第一个圆弧，画一半，第二个画一半。

//draw background arc
canvas.drawArc(mRectF, 135 + degree, 270 - degree, false, mPaint);

//draw progress arc
canvas.drawArc(mRectF, 135, degree, false, mProgressPaint);

2.中间的指针怎么弄

先画出指针的路径

mPointerPath = new Path();
mPointerPath.moveTo(centerX + pointRadius, centerY - 7);
mPointerPath.lineTo(centerX + pointRadius, centerY + 7);
mPointerPath.lineTo(mRectF.right - pointGap - lineWidth / 2,centerY);
mPointerPath.lineTo(centerX + pointRadius, centerY - 7);
mPointerPath.close();

在中心draw一个小圆

然后draw指针,这样当画布旋转时指针自然也就旋转了，不懂得要去看看canvas.save(), canvas.restore()的作用

//draw pointer
canvas.drawCircle(centerX, centerY, pointRadius,mInnerCirclePaint);
canvas.save();
canvas.rotate(135 + degree, centerX, centerY);
canvas.drawPath(mPointerPath, mPointerPaint);
canvas.restore();

下面上完整代码：

package deadline.grade;

import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.os.Build;
import android.support.annotation.IntRange;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;

/**
* @author deadline
* @time 2016/9/24
*/
public class GradeProgressView extends View {

private static final String TAG = GradeProgressView.class.getSimpleName();

private static final int DEFAULT_PROGRESS_COLOR = Color.WHITE;
private static final int DEFAULT_BACKGROUND_COLOR = 0x5AFFFFFF;

private int mBackgroundColor = DEFAULT_BACKGROUND_COLOR;
private int mProgressColor = DEFAULT_PROGRESS_COLOR;

//进度条的每格线宽，间距，长度
private int dashWith = 4;
private int dashSpace = 6;
private int lineWidth = 60;

//最外圈线的宽度和与进度条之间的间距
private int outLineWidth = 5;
private int gapWidth = 25;

//指针的线宽度， 半径， 以及指针与进度条的间距
private int pointLineWidth = 10;
private int pointRadius = 25;
private int pointGap = 20;

private int mProgress = 0;

//外线
private RectF mOuterRectF;
private Paint mOuterPaint;

//进度条
private RectF mRectF;
private Paint mPaint;
private Paint mProgressPaint;

//指针
private Paint mInnerCirclePaint;
private Paint mPointerPaint;
private Path  mPointerPath;

private float centerX;
private float centerY;

private ValueAnimator animator;

private OnProgressChangeListener mListener;

public GradeProgressView(Context context) {
this(context, null);
}

public GradeProgressView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public GradeProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setup();
}

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

private void setup() {

mRectF = new RectF();
mOuterRectF = new RectF();

mOuterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mOuterPaint.setStrokeWidth(outLineWidth);
mOuterPaint.setColor(mBackgroundColor);
mOuterPaint.setStyle(Paint.Style.STROKE);

mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setStrokeWidth(lineWidth);
mPaint.setColor(mBackgroundColor);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));

mProgressPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mProgressPaint.setStrokeWidth(lineWidth);
mProgressPaint.setColor(mProgressColor);
mProgressPaint.setStyle(Paint.Style.STROKE);
mProgressPaint.setPathEffect(new DashPathEffect(new float[]{dashWith, dashSpace}, dashSpace));

mPointerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPointerPaint.setStrokeWidth(pointLineWidth / 2);
mPointerPaint.setColor(mProgressColor);
mPointerPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPointerPaint.setStrokeCap(Paint.Cap.ROUND);
mPointerPaint.setShadowLayer(4, 3, 0, 0x20000000);

mInnerCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mInnerCirclePaint.setStrokeWidth(pointLineWidth);
mInnerCirclePaint.setColor(mProgressColor);
mInnerCirclePaint.setStyle(Paint.Style.STROKE);
mInnerCirclePaint.setShadowLayer(4, 3, 0, 0x20000000);
}

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

int value = outLineWidth / 2;
mOuterRectF.set(value, value, w - value, h - value);

int gap = lineWidth / 2 + outLineWidth + gapWidth;

mRectF.set(mOuterRectF.left + gap,
mOuterRectF.top + gap,
mOuterRectF.right - gap,
mOuterRectF.bottom - gap);

centerX = mRectF.centerX();
centerY = mRectF.centerY();

mPointerPath = new Path();
mPointerPath.moveTo(centerX + pointRadius, centerY - 7);
mPointerPath.lineTo(centerX + pointRadius, centerY + 7);
mPointerPath.lineTo(mRectF.right - pointGap - lineWidth / 2, centerY);
mPointerPath.lineTo(centerX + pointRadius, centerY - 7);
mPointerPath.close();
}

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

float degree = 2.7f * mProgress;

//draw out arc
canvas.drawArc(mOuterRectF, 135, 270, false, mOuterPaint);

//draw background arc
canvas.drawArc(mRectF, 135 + degree, 270 - degree, false, mPaint);

//draw progress arc
canvas.drawArc(mRectF, 135, degree, false, mProgressPaint);

//draw pointer
canvas.drawCircle(centerX, centerY, pointRadius, mInnerCirclePaint);

canvas.save();
canvas.rotate(135 + degree, centerX, centerY);
canvas.drawPath(mPointerPath, mPointerPaint);
canvas.restore();
}

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

int measureWidth = MeasureSpec.getSize(widthMeasureSpec);
int measureHeight = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(Math.min(measureHeight, measureWidth), Math.min(measureHeight, measureWidth));
}

public void setOnProgressChangeListener(OnProgressChangeListener listener){
this.mListener = listener;
}

public int getProgressColor() {
return mProgressColor;
}

public void setProgressColor(int progressColor) {
this.mProgressColor = progressColor;
if(mProgressPaint != null){
mProgressPaint.setColor(mProgressColor);
}

if(mPointerPaint != null){
mPointerPaint.setColor(mProgressColor);
}

if(mInnerCirclePaint != null){
mInnerCirclePaint.setColor(mProgressColor);
}
postInvalidate();
}

public int getBackgroundColor() {
return mBackgroundColor;
}

public void setBackgroundColor(int backgroundColor) {

this.mBackgroundColor = backgroundColor;
if(mPaint != null){
mPaint.setColor(mBackgroundColor);
}

if(mOuterPaint != null){
mOuterPaint.setColor(mBackgroundColor);
}
postInvalidate();
}

public int getLineWidth() {
return lineWidth;
}

public void setLineWidth(int lineWidth) {
this.lineWidth = lineWidth;
if(mPaint != null){
mPaint.setStrokeWidth(lineWidth);
}

if(mProgressPaint != null){
mProgressPaint.setStrokeWidth(lineWidth);
}
postInvalidate();
}

public int getOutLineWidth() {
return outLineWidth;
}

public void setOutLineWidth(int outLineWidth) {
this.outLineWidth = outLineWidth;
if(mOuterPaint != null){
mOuterPaint.setStrokeWidth(outLineWidth);
}
postInvalidate();
}

public int getGapWidth() {
return gapWidth;
}

public void setGapWidth(int gapWidth) {
this.gapWidth = gapWidth;
}

public int getProgress() {
return mProgress;
}

public void setProgress(@IntRange(from = 0, to = 100) int progress) {
if(progress > 100){
progress = 100;
}

if(progress < 0){
progress = 0;
}
this.mProgress = progress;
if(mListener != null){
mListener.onProgressChanged(GradeProgressView.this, mProgress);
}
postInvalidate();
}

public void setProgressWidthAnimation(@IntRange(from = 0, to = 100) int progress){

if(progress > 100){
progress = 100;
}

if(progress < 0){
progress = 0;
}

if(animator != null && animator.isRunning()){
animator.cancel();
animator = null;
}

animator = ValueAnimator.ofInt(mProgress, progress);
int duration = 10 * Math.abs(progress - mProgress);
animator.setDuration(duration);

animator.setInterpolator(new AccelerateDecelerateInterpolator());
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int value = (int)valueAnimator.getAnimatedValue();
if(mProgress != value) {
mProgress = value;
if(mListener != null){
mListener.onProgressChanged(GradeProgressView.this, mProgress);
}
postInvalidate();
}
}
});
animator.start();

}

@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();

if(animator != null){
animator.cancel();
animator = null;
}

}

public interface OnProgressChangeListener{

void onProgressChanged(GradeProgressView gradeProgressView, int progress);
}
}