微信QQ附近好友雷达扫描

1.概述

　　最近一直到在带实习生，因为人比较多，所以很长一段时间没有更新博客了，今天更新一篇雷达扫描附近好友效果，以后尽量每周更新一篇，先看一下效果：
　　
　　

2．实现　

　　１．效果分析
　　效果分为两个部分，一个是上半部分的自定义RadarView，还有就是下半部分的ViewPager，至于怎么做到缩放和背景虚化的效果大家可以去看看LazyViewPager这里不详细介绍,也可以去慕课网看看http://www.imooc.com/view/226，这里主要实现扫描效果部分
　　
　　

　　２．扫描效果实现
　　2.1自定义RadarView在onDraw()方法中画六个圆圈，至于圆圈的半径是多少我们需要通过onMeasure(int widthMeasureSpec, int heightMeasureSpec)测量方法获取控件的宽高来确定圆的半径，每个圆的半径是宽度的1 / 13f, 2 / 13f, 3 / 13f, 4 / 13f, 5 / 13f, 6 / 13f，这只是自己测试出来感觉比较舒适的效果，下面请看代码：

//每个圆圈所占的比例
private static float[] circleProportion = {1 / 13f, 2 / 13f, 3 / 13f, 4 / 13f, 5 / 13f, 6 / 13f};
private Paint mPaintCircle;//画圆需要用到的paintpublic class RadarView extends View {public RadarView(Context context) {this(context, null);}public RadarView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public RadarView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}private void init() {mPaintCircle = new Paint();mPaintCircle.setColor(Color.WHITE);mPaintCircle.setAntiAlias(true);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// 获取控件的宽高setMeasuredDimension(measureSize(widthMeasureSpec), measureSize(widthMeasureSpec));mWidth = getMeasuredWidth();mHeight = getMeasuredHeight();mWidth = mHeight = Math.min(mWidth, mHeight);}@Overrideprotected void onDraw(Canvas canvas) {// 绘制六个白色圆圈drawCircle(canvas);}/*** 绘制圆线圈** @param canvas*/private void drawCircle(Canvas canvas) {canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[1], mPaintLine);   // 绘制最小圆canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[1], mPaintLine);     // 绘制小圆canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[2], mPaintLine);   // 绘制中圆canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[3], mPaintLine); // 绘制中大圆canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[4], mPaintLine);  // 绘制大圆canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[5], mPaintLine);  // 绘制大大圆}
}

2.2下面需要去画中间的用户图像，可以运行看看中间的六个圆圈有没有达到效果，这里就不看了直接在onDraw()方法中画中间图像：

    private Bitmap centerBitmap;//最中间iconprivate void init(){// 通过bitmap工厂区获取用户图像的bitmapcenterBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.circle_photo);}@Overrideprotected void onDraw(Canvas canvas) {drawCenterIcon(canvas);}/*** 绘制最中间的图标** @param canvas*/private void drawCenterIcon(Canvas canvas) {int iconWidth = mWidth * circleProportion[0];canvas.drawBitmap(centerBitmap, 0,0,iconWidth ,iconWidth , null);}

　　2.3最后只需要实现这个扫描的效果这个控件基本就完成了，第一需要开启线程不断调用invalidate()去更新onDraw()方法，第二需要熟悉扫描渲染SweepGradient这个类，如果这两个都没问题那么大功告成：

private Paint mPaintScan;//画扫描需要用到的paint
private Matrix matrix = new Matrix();//旋转需要的矩阵
private int mRoteDegree;//扫描旋转的角度
private Shader scanShader;//扫描渲染shaderpublic Runnable run = new Runnable() {@Overridepublic void run() {mRoteDegree +=2;mRoteMatrix.postRotate(mRoteDegree,cx,cy);invalidate();postDelayed(run,60);}};@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {//设置扫描渲染的shaderscanShader = new SweepGradient(mWidth / 2, mHeight / 2,new int[]{Color.TRANSPARENT, Color.parseColor("#84B5CA")}, null);}@Overrideprotected void onDraw(Canvas canvas) {drawScan(canvas);}/*** 绘制扫描** @param canvas*/private void drawScan(Canvas canvas) {canvas.save();mPaintScan.setShader(scanShader);canvas.concat(matrix);canvas.drawCircle(mWidth / 2, mHeight / 2, mWidth * circleProportion[4], mPaintScan);canvas.restore();}

2.4.到这里我们来看一下扫描RadarView的效果

3. 实现添加数据效果RadarViewGroup,我们的图像附近点需要加入ViewGroup这里又需要自定义了，这里简单说一下自定ViewGroup：
1.onMeasure()测量方法这里就不说了
2.只要搞清楚onLayout()方法是干嘛的就Ok,ViewGroup里面的子View都显示在什么位置就是写在这个方法里面的，换句话说有的隔得近有的隔得远都是由 child.layout(int l, int t, int r, int b)决定的，下面我们看一下代码：

    public class RadarViewGroup extends ViewGroup implements RadarView.IScanningListener {private int mWidth, mHeight;//viewgroup的宽高private SparseArray<Float> scanAngleList = new SparseArray<>();//记录展示的item所在的扫描位置角度private SparseArray<Info> mDatas;//数据源private int dataLength;//数据源长度private int minItemPosition;//最小距离的item所在数据源中的位置private CircleView currentShowChild;//当前展示的itemprivate CircleView minShowChild;//最小距离的itemprivate IRadarClickListener iRadarClickListener;//雷达图中点击监听CircleView小圆点回调接口public void setiRadarClickListener(IRadarClickListener iRadarClickListener) {this.iRadarClickListener = iRadarClickListener;}public RadarViewGroup(Context context) {this(context, null);}public RadarViewGroup(Context context, AttributeSet attrs) {this(context, attrs, 0);}public RadarViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {setMeasuredDimension(measureSize(widthMeasureSpec), measureSize(heightMeasureSpec));mWidth = getMeasuredWidth();mHeight = getMeasuredHeight();mWidth = mHeight = Math.min(mWidth, mHeight);//测量每个childrenmeasureChildren(widthMeasureSpec, heightMeasureSpec);for (int i = 0; i < getChildCount(); i++) {View child = getChildAt(i);if (child.getId() == R.id.id_scan_circle) {//为雷达扫描图设置需要的属性((RadarView) child).setScanningListener(this);//考虑到数据没有添加前扫描图在扫描，但是不会开始为CircleView布局if (mDatas != null && mDatas.size() > 0) {((RadarView) child).setMaxScanItemCount(mDatas.size());((RadarView) child).startScan();}continue;}}}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {int childCount = getChildCount();//首先放置雷达扫描图View view = findViewById(R.id.id_scan_circle);if (view != null) {view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());}//放置雷达图中需要展示的item圆点for (int i = 0; i < childCount; i++) {final int j = i;final View child = getChildAt(i);if (child.getId() == R.id.id_scan_circle) {//如果不是Circleview跳过continue;}//设置CircleView小圆点的坐标信息//坐标 = 旋转角度 * 半径 * 根据远近距离的不同计算得到的应该占的半径比例((CircleView) child).setDisX((float) Math.cos(Math.toRadians(scanAngleList.get(i - 1) - 5))* ((CircleView) child).getProportion() * mWidth / 2);((CircleView) child).setDisY((float) Math.sin(Math.toRadians(scanAngleList.get(i - 1) - 5))* ((CircleView) child).getProportion() * mWidth / 2);//如果扫描角度记录SparseArray中的对应的item的值为0，// 说明还没有扫描到该item，跳过对该item的layout//（scanAngleList设置数据时全部设置的value=0，// 当onScanning时，value设置的值始终不会0，具体可以看onScanning中的实现）if (scanAngleList.get(i - 1) == 0) {continue;}//放置Circle小圆点child.layout((int) ((CircleView) child).getDisX() + mWidth / 2, (int) ((CircleView) child).getDisY() + mHeight / 2,(int) ((CircleView) child).getDisX() + child.getMeasuredWidth() + mWidth / 2,(int) ((CircleView) child).getDisY() + child.getMeasuredHeight() + mHeight / 2);//设置点击事件child.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {resetAnim(currentShowChild);currentShowChild = (CircleView) child;//因为雷达图是childAt(0),所以这里需要作-1才是正确的CirclestartAnim(currentShowChild, j - 1);if (iRadarClickListener != null) {iRadarClickListener.onRadarItemClick(j - 1);}}});}}private int measureSize(int measureSpec) {int result = 0;int specMode = MeasureSpec.getMode(measureSpec);int specSize = MeasureSpec.getSize(measureSpec);if (specMode == MeasureSpec.EXACTLY) {result = specSize;} else {result = 300;if (specMode == MeasureSpec.AT_MOST) {result = Math.min(result, specSize);}}return result;}/*** 设置数据** @param mDatas*/public void setDatas(SparseArray<Info> mDatas) {this.mDatas = mDatas;dataLength = mDatas.size();float min = Float.MAX_VALUE;float max = Float.MIN_VALUE;//找到距离的最大值，最小值对应的minItemPositionfor (int j = 0; j < dataLength; j++) {Info item = mDatas.get(j);if (item.getDistance() < min) {min = item.getDistance();minItemPosition = j;}if (item.getDistance() > max) {max = item.getDistance();}scanAngleList.put(j, 0f);}//根据数据源信息动态添加CircleViewfor (int i = 0; i < dataLength; i++) {CircleView circleView = new CircleView(getContext());if (mDatas.get(i).getSex()) {circleView.setPaintColor(getResources().getColor(R.color.bg_color_pink));} else {circleView.setPaintColor(getResources().getColor(R.color.bg_color_blue));}//根据远近距离的不同计算得到的应该占的半径比例 0.312-0.832circleView.setProportion((mDatas.get(i).getDistance() / max + 0.6f) * 0.52f);if (minItemPosition == i) {minShowChild = circleView;}addView(circleView);}}/*** 雷达图没有扫描完毕时回调** @param position* @param scanAngle*/@Overridepublic void onScanning(int position, float scanAngle) {if (scanAngle == 0) {scanAngleList.put(position, 1f);} else {scanAngleList.put(position, scanAngle);}requestLayout();}/*** 雷达图扫描完毕时回调*/@Overridepublic void onScanSuccess() {LogUtil.m("完成回调");resetAnim(currentShowChild);currentShowChild = minShowChild;startAnim(currentShowChild, minItemPosition);}/*** 恢复CircleView小圆点原大小** @param object*/private void resetAnim(CircleView object) {if (object != null) {object.clearPortaitIcon();ObjectAnimator.ofFloat(object, "scaleX", 1f).setDuration(300).start();ObjectAnimator.ofFloat(object, "scaleY", 1f).setDuration(300).start();}}/*** 放大CircleView小圆点大小** @param object* @param position*/private void startAnim(CircleView object, int position) {if (object != null) {object.setPortraitIcon(mDatas.get(position).getPortraitId());ObjectAnimator.ofFloat(object, "scaleX", 2f).setDuration(300).start();ObjectAnimator.ofFloat(object, "scaleY", 2f).setDuration(300).start();}}/*** 雷达图中点击监听CircleView小圆点回调接口*/public interface IRadarClickListener {void onRadarItemClick(int position);}/*** 根据position，放大指定的CircleView小圆点** @param position*/public void setCurrentShowItem(int position) {CircleView child = (CircleView) getChildAt(position + 1);resetAnim(currentShowChild);currentShowChild = child;startAnim(currentShowChild, position);}
}

附源码地址：http://download.csdn.net/detail/z240336124/9590748