Android自定义加载loading view动画组件

在github上找的一个有点酷炫的loading动画https://github.com/Fichardu/CircleProgress 

我写写使用步骤 

自定义view（CircleProgress ）的代码 

package com.hysmarthotel.view;
import com.hysmarthotel.roomcontrol.R;
import com.hysmarthotel.util.EaseInOutCubicInterpolator;
import android.animation.TimeInterpolator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AnimationUtils;
public class CircleProgress extends View {
 private static final int RED = 0xFFE5282C;
 private static final int YELLOW = 0xFF1F909A;
 private static final int BLUE = 0xFFFC9E12;
 private static final int COLOR_NUM = 3;
 private int[] COLORS;
 private TimeInterpolator mInterpolator = new EaseInOutCubicInterpolator();
 private final double DEGREE = Math.PI / 180;
 private Paint mPaint;
 private int mViewSize;
 private int mPointRadius;
 private long mStartTime;
 private long mPlayTime;
 private boolean mStartAnim = false;
 private Point mCenter = new Point();
 private ArcPoint[] mArcPoint;
 private static final int POINT_NUM = 15;
 private static final int DELTA_ANGLE = 360 / POINT_NUM;
 private long mDuration = 3600;
 public CircleProgress(Context context) {
  super(context);
  init(null, 0);
 }
 public CircleProgress(Context context, AttributeSet attrs) {
  super(context, attrs);
  init(attrs, 0);
 }
 public CircleProgress(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  init(attrs, defStyle);
 }
 private void init(AttributeSet attrs, int defStyle) {
  mArcPoint = new ArcPoint[POINT_NUM];
  mPaint = new Paint();
  mPaint.setAntiAlias(true);
  mPaint.setStyle(Paint.Style.FILL);
  TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CircleProgress, defStyle, 0);
  int color1 = a.getColor(R.styleable.CircleProgress_color1, RED);
  int color2 = a.getColor(R.styleable.CircleProgress_color2, YELLOW);
  int color3 = a.getColor(R.styleable.CircleProgress_color3, BLUE);
  a.recycle();
  COLORS = new int[]{color1, color2, color3};
 }
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  int defaultSize = getResources().getDimensionPixelSize(R.dimen.default_circle_view_size);
  int width = getDefaultSize(defaultSize, widthMeasureSpec);
  int height = getDefaultSize(defaultSize, heightMeasureSpec);
  mViewSize = Math.min(width, height);
  setMeasuredDimension(mViewSize, mViewSize);
  mCenter.set(mViewSize / 2, mViewSize / 2);
  calPoints(1.0f);
 }
 @Override
 protected void onDraw(Canvas canvas) {
  canvas.save();
  canvas.translate(mCenter.x, mCenter.y);
  float factor = getFactor();
  canvas.rotate(36 * factor);
  float x, y;
  for (int i = 0; i < POINT_NUM; ++i) {
   mPaint.setColor(mArcPoint[i].color);
   float itemFactor = getItemFactor(i, factor);
   x = mArcPoint[i].x - 2 * mArcPoint[i].x * itemFactor;
   y = mArcPoint[i].y - 2 * mArcPoint[i].y * itemFactor;
   canvas.drawCircle(x, y, mPointRadius, mPaint);
  }
  canvas.restore();
  if (mStartAnim) {
   postInvalidate();
  }
 }
 private void calPoints(float factor) {
  int radius = (int) (mViewSize / 3 * factor);
  mPointRadius = radius / 12;
  for (int i = 0; i < POINT_NUM; ++i) {
   float x = radius * -(float) Math.sin(DEGREE * DELTA_ANGLE * i);
   float y = radius * -(float) Math.cos(DEGREE * DELTA_ANGLE * i);
   ArcPoint point = new ArcPoint(x, y, COLORS[i % COLOR_NUM]);
   mArcPoint[i] = point;
  }
 }
 private float getFactor() {
  if (mStartAnim) {
   mPlayTime = AnimationUtils.currentAnimationTimeMillis() - mStartTime;
  }
  float factor = mPlayTime / (float) mDuration;
  return factor % 1f;
 }
 private float getItemFactor(int index, float factor) {
  float itemFactor = (factor - 0.66f / POINT_NUM * index) * 3;
  if (itemFactor < 0f) {
   itemFactor = 0f;
  } else if (itemFactor > 1f) {
   itemFactor = 1f;
  }
  return mInterpolator.getInterpolation(itemFactor);
 }
 public void startAnim() {
  mPlayTime = mPlayTime % mDuration;
  mStartTime = AnimationUtils.currentAnimationTimeMillis() - mPlayTime;
  mStartAnim = true;
  postInvalidate();
 }
 public void reset() {
  stopAnim();
  mPlayTime = 0;
  postInvalidate();
 }
 public void stopAnim() {
  mStartAnim = false;
 }
 public void setInterpolator(TimeInterpolator interpolator) {
  mInterpolator = interpolator;
 }
 public void setDuration(long duration) {
  mDuration = duration;
 }
 public void setRadius(float factor) {
  stopAnim();
  calPoints(factor);
  startAnim();
 }
 static class ArcPoint {
  float x;
  float y;
  int color;
  ArcPoint(float x, float y, int color) {
   this.x = x;
   this.y = y;
   this.color = color;
  }
 }
}

EaseInOutCubicInterpolator是自定义view（CircleProgress ）中要是用的一个工具 

package com.hysmarthotel.util;
import android.animation.TimeInterpolator;
public class EaseInOutCubicInterpolator implements TimeInterpolator {
 @Override
 public float getInterpolation(float input) {
  if ((input *= 2) < 1.0f) {
   return 0.5f * input * input * input;
  }
  input -= 2;
  return 0.5f * input * input * input + 1;
 }
}

在activity中的调用（还有一些其他用法可以自己看看github上的源代码） 

mProgressView = (CircleProgress)findViewById(R.id.progress_vie);
mProgressView.startAnim(); //开始
mProgressView.stopAnim(); //结束
mProgressView.setRadius(factor); //半径
mProgressView.reset(); //复原

在xml文件中的布局 

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:circleprogress="http://schemas.android.com/apk/res/com.hysmarthotel.roomcontrol"  //这个地方记得要加 //包名
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@drawable/bg1" >
 <com.hysmarthotel.view.CircleProgress                   //类名
  android:id="@+id/progress_vie"
  android:layout_x="350.5px"
  android:layout_y="150.0px"
  android:layout_width="1140.0px"
  android:layout_height="700.0px"
  circleprogress:color1="@android:color/holo_red_light"   //这些参数就是通过xmlns:circleprogress，和attrs文件相关联的 　　　　circleprogress:color2="@android:color/holo_green_light" 　　　　circleprogress:color3="@android:color/holo_blue_light" />

自己在values目录中新建的attrs文件，这是与自定义view中自定义参数相关的

 <declare-styleable name="CircleProgress">
  <attr name="color1" format="reference|color"/>
  <attr name="color2" format="reference|color"/>
  <attr name="color3" format="reference|color"/>
 </declare-styleable> 

自己在values目录中新建的dimens文件，这个只是几个颜色参数

 <?xml version="1.0" encoding="utf-8"?>
<resources>
 <dimen name="activity_horizontal_margin">16dp</dimen>
 <dimen name="activity_vertical_margin">16dp</dimen>
 <dimen name="default_circle_view_size">200dp</dimen>
</resources>

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