Android仿小米安全中心检测进度条效果

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

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

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;

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);
 }
}

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