1.概述

老规矩，先上图

原装货（就不录制gif了，大家可以自己在Q群助手开启共享地理位置，返回群聊天页面就看到看到附近的人）：

看起来还是挺像的吧。

通过观察，我们可以获取得到如下关系

1.下面展示列表我们可以使用ViewPager来实现（当然如果你不觉得麻烦，你也可以用HorizontalScrollView来试试）

2.上面的扫描图，肯定是个ViewGroup(因为里面的小圆点是可以点击的，如果是View的话，对于这些小圆点的位置的判断，以及对小圆点缩放动画的处理都会超级麻烦，难以实现)，所以我们肯定需要自定义ViewGroup

3.确定好了是自定义ViewGroup后，对于里面需要放什么对象呢？没错，就是N个小圆点+一个扫描的大圈圈。

有了上面的分析，我们基本可以确定我们的项目结构如下了：

下面将逐个击破，完成最终效果！

二.展示用的viewpager

通过上面的分析，可以确定我们首先需要一个been类 Info

public class Info { private int portraitId;//头像id private String name;//名字 private String age;//年龄 private boolean sex;//false为男，true为女 private float distance;//距离 public int getPortraitId() { return portraitId; } public void setPortraitId(int portraitId) { this.portraitId = portraitId; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } public float getDistance() { return distance; } public void setDistance(float distance) { this.distance = distance; } public String getName() { return name; } public void setName(String name) { this.name = name; } public boolean getSex() { return sex; } public void setSex(boolean sex) { this.sex = sex; } }

因为我们想要viewpager左右滑动的时候，当滑动速度大于一定值，则可以一次滑动两个item，所以我们需要自定义一个获取速度的ViewPager

public class CustomViewPager extends ViewPager{ private long downTime; private float LastX; private float mSpeed; public CustomViewPager(Context context) { super(context); } public CustomViewPager(Context context, AttributeSet attrs) { super(context, attrs); } @Override public boolean dispatchTouchEvent(MotionEvent ev) { float x = ev.getX(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: downTime = System.currentTimeMillis(); LastX = x; break; case MotionEvent.ACTION_MOVE: x = ev.getX(); break; case MotionEvent.ACTION_UP: //计算得到手指从按下到离开的滑动速度 mSpeed = (x - LastX) * 1000 / (System.currentTimeMillis() - downTime); break; } return super.dispatchTouchEvent(ev); } public float getSpeed() { return mSpeed; } public void setSpeed(float mSpeed) { this.mSpeed = mSpeed; } }

最后就是我们的MainAcitivyt中进行相应的设置

public class MainActivity extends Activity implements ViewPager.OnPageChangeListener, RadarViewGroup.IRadarClickListener { private CustomViewPager viewPager; private RelativeLayout ryContainer; private RadarViewGroup radarViewGroup; private int[] mImgs = {R.drawable.len, R.drawable.leo, R.drawable.lep, R.drawable.leq, R.drawable.ler, R.drawable.les, R.drawable.mln, R.drawable.mmz, R.drawable.mna, R.drawable.mnj, R.drawable.leo, R.drawable.leq, R.drawable.les, R.drawable.lep}; private String[] mNames = {"ImmortalZ", "唐马儒", "王尼玛", "张全蛋", "蛋花", "王大锤", "叫兽", "哆啦A梦"}; private int mPosition; private FixedSpeedScroller scroller; private SparseArray<Info> mDatas = new SparseArray<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); /** * 将Viewpager所在容器的事件分发交给ViewPager */ ryContainer.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return viewPager.dispatchTouchEvent(event); } }); ViewpagerAdapter mAdapter = new ViewpagerAdapter(); viewPager.setAdapter(mAdapter); //设置缓存数为展示的数目 viewPager.setOffscreenPageLimit(mImgs.length); viewPager.setPageMargin(getResources().getDimensionPixelOffset(R.dimen.viewpager_margin)); //设置切换动画 viewPager.setPageTransformer(true, new ZoomOutPageTransformer()); viewPager.addOnPageChangeListener(this); setViewPagerSpeed(250); new Handler().postDelayed(new Runnable() { @Override public void run() { radarViewGroup.setDatas(mDatas); } }, 1500); radarViewGroup.setiRadarClickListener(this); } private void initData() { for (int i = 0; i < mImgs.length; i++) { Info info = new Info(); info.setPortraitId(mImgs[i]); info.setAge(((int) Math.random() * 25 + 16) + "岁"); info.setName(mNames[(int) (Math.random() * mNames.length)]); info.setSex(i % 3 == 0 ? false : true); info.setDistance(Math.round((Math.random() * 10) * 100) / 100); mDatas.put(i, info); } } private void initView() { viewPager = (CustomViewPager) findViewById(R.id.vp); radarViewGroup = (RadarViewGroup) findViewById(R.id.radar); ryContainer = (RelativeLayout) findViewById(R.id.ry_container); } /** * 设置ViewPager切换速度 * * @param duration */ private void setViewPagerSpeed(int duration) { try { Field field = ViewPager.class.getDeclaredField("mScroller"); field.setAccessible(true); scroller = new FixedSpeedScroller(MainActivity.this, new AccelerateInterpolator()); field.set(viewPager, scroller); scroller.setmDuration(duration); } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { mPosition = position; } @Override public void onPageSelected(int position) { radarViewGroup.setCurrentShowItem(position); LogUtil.m("当前位置 " + mPosition); LogUtil.m("速度 " + viewPager.getSpeed()); //当手指左滑速度大于2000时viewpager右滑（注意是item+2） if (viewPager.getSpeed() < -1800) { viewPager.setCurrentItem(mPosition + 2); LogUtil.m("位置 " + mPosition); viewPager.setSpeed(0); } else if (viewPager.getSpeed() > 1800 && mPosition > 0) { //当手指右滑速度大于2000时viewpager左滑（注意item-1即可） viewPager.setCurrentItem(mPosition - 1); LogUtil.m("位置 " + mPosition); viewPager.setSpeed(0); } } @Override public void onPageScrollStateChanged(int state) { } @Override public void onRadarItemClick(int position) { viewPager.setCurrentItem(position); } class ViewpagerAdapter extends PagerAdapter { @Override public Object instantiateItem(ViewGroup container, final int position) { final Info info = mDatas.get(position); //设置一大堆演示用的数据，麻里麻烦~~ View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.viewpager_layout, null); ImageView ivPortrait = (ImageView) view.findViewById(R.id.iv); ImageView ivSex = (ImageView) view.findViewById(R.id.iv_sex); TextView tvName = (TextView) view.findViewById(R.id.tv_name); TextView tvDistance = (TextView) view.findViewById(R.id.tv_distance); tvName.setText(info.getName()); tvDistance.setText(info.getDistance() + "km"); ivPortrait.setImageResource(info.getPortraitId()); if (info.getSex()) { ivSex.setImageResource(R.drawable.girl); } else { ivSex.setImageResource(R.drawable.boy); } ivPortrait.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "这是 " + info.getName() + " >.<", Toast.LENGTH_SHORT).show(); } }); container.addView(view); return view; } @Override public int getCount() { return mImgs.length; } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public void destroyItem(ViewGroup container, int position, Object object) { View view = (View) object; container.removeView(view); } } }

在贴出MainAcitivity对应的XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/lkd" android:paddingLeft="5dp" android:paddingRight="5dp"> <mr_immortalz.com.modelqq.custom.RadarViewGroup android:id="@+id/radar" android:layout_width="280dp" android:layout_height="280dp" android:layout_centerHorizontal="true" android:layout_marginTop="50dp"> <mr_immortalz.com.modelqq.custom.RadarView android:id="@id/id_scan_circle" android:layout_width="280dp" android:layout_height="280dp"/> </mr_immortalz.com.modelqq.custom.RadarViewGroup> <RelativeLayout android:id="@+id/ry_container" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="25dp" android:clipChildren="false"> <mr_immortalz.com.modelqq.custom.CustomViewPager android:id="@+id/vp" android:layout_width="130dp" android:layout_height="160dp" android:layout_centerInParent="true" android:layout_marginLeft="120dp" android:layout_marginRight="120dp" android:clipChildren="false" /> </RelativeLayout> </RelativeLayout>

注意如果我们想要让ViewPager一次显示多个，需要设置其所在 父容器 Android:clipChildren=”false”

意思就是不限制子View在其范围内。

细心的你可能会发现MainAcitivity中有

viewPager.setPageTransformer(true, new ZoomOutPageTransformer());

这个，没错，这个就是用来控制我们的切换动画（我在谷歌官方提供的这个基础上进行了修改，也是很好理解）

public class ZoomOutPageTransformer implements ViewPager.PageTransformer { private static final float MIN_SCALE = 0.70f; private static final float MIN_ALPHA = 0.5f; public void transformPage(View view, float position) { int pageWidth = view.getWidth(); int pageHeight = view.getHeight(); if (position < -1) { // [-Infinity,-1) // This page is way off-screen to the left. view.setAlpha(MIN_ALPHA); view.setScaleX(MIN_SCALE); view.setScaleY(MIN_SCALE); } else if (position <= 1) { // [-1,1] // Modify the default slide transition to shrink the page as well float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position)); float vertMargin = pageHeight * (1 - scaleFactor) / 2; float horzMargin = pageWidth * (1 - scaleFactor) / 2; if (position < 0) { view.setTranslationX(horzMargin - vertMargin / 2); view.setScaleX(1 + 0.3f * position); view.setScaleY(1 + 0.3f * position); } else { view.setTranslationX(-horzMargin + vertMargin / 2); view.setScaleX(1 - 0.3f * position); view.setScaleY(1 - 0.3f * position); } // Scale the page down (between MIN_SCALE and 1) // Fade the page relative to its size. view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA)); } else { // (1,+Infinity] // This page is way off-screen to the right. view.setScaleX(MIN_SCALE); view.setScaleY(MIN_SCALE); view.setAlpha(MIN_ALPHA); } } }

完成了上面这些代码，我们的ViewPager就算搞定了

三.实现雷达扫描图

代码中也注释得很清楚了，当然因为要扫描，我们需要不停的转动，所以这里我们用到了矩阵变换Matrix，扫描消息的停顿和传递我们用到了Runnable ，如果要是觉得在向主线程一直投递变换的消息对主线程不好，你可以考虑下用SurfaceView来实现

public class RadarView extends View { private Paint mPaintLine;//画圆线需要用到的paint private Paint mPaintCircle;//画圆需要用到的paint private Paint mPaintScan;//画扫描需要用到的paint private int mWidth, mHeight;//整个图形的长度和宽度 private Matrix matrix = new Matrix();//旋转需要的矩阵 private int scanAngle;//扫描旋转的角度 private Shader scanShader;//扫描渲染shader private Bitmap centerBitmap;//最中间icon //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 int scanSpeed = 5; private int currentScanningCount;//当前扫描的次数 private int currentScanningItem;//当前扫描显示的item private int maxScanItemCount;//最大扫描次数 private boolean startScan = false;//只有设置了数据后才会开始扫描 private IScanningListener iScanningListener;//扫描时监听回调接口 public void setScanningListener(IScanningListener iScanningListener) { this.iScanningListener = iScanningListener; } private Runnable run = new Runnable() { @Override public void run() { scanAngle = (scanAngle + scanSpeed) % 360; matrix.postRotate(scanSpeed, mWidth / 2, mHeight / 2); invalidate(); postDelayed(run, 130); //开始扫描显示标志为true 且 只扫描一圈 if (startScan && currentScanningCount <= (360 / scanSpeed)) { if (iScanningListener != null && currentScanningCount % scanSpeed == 0 && currentScanningItem < maxScanItemCount) { iScanningListener.onScanning(currentScanningItem, scanAngle); currentScanningItem++; } else if (iScanningListener != null && currentScanningItem == maxScanItemCount) { iScanningListener.onScanSuccess(); } currentScanningCount++; } } }; 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(); post(run); } private void init() { mPaintLine = new Paint(); mPaintLine.setColor(getResources().getColor(R.color.line_color_blue)); mPaintLine.setAntiAlias(true); mPaintLine.setStrokeWidth(1); mPaintLine.setStyle(Paint.Style.STROKE); mPaintCircle = new Paint(); mPaintCircle.setColor(Color.WHITE); mPaintCircle.setAntiAlias(true); mPaintScan = new Paint(); mPaintScan.setStyle(Paint.Style.FILL_AND_STROKE); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(measureSize(widthMeasureSpec), measureSize(widthMeasureSpec)); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); mWidth = mHeight = Math.min(mWidth, mHeight); centerBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.circle_photo); //设置扫描渲染的shader scanShader = new SweepGradient(mWidth / 2, mHeight / 2, new int[]{Color.TRANSPARENT, Color.parseColor("#84B5CA")}, null); } 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; } @Override protected void onDraw(Canvas canvas) { drawCircle(canvas); drawScan(canvas); drawCenterIcon(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 } /** * 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(); } /** * 绘制最中间的图标 * * @param canvas */ private void drawCenterIcon(Canvas canvas) { canvas.drawBitmap(centerBitmap, null, new Rect((int) (mWidth / 2 - mWidth * circleProportion[0]), (int) (mHeight / 2 - mWidth * circleProportion[0]), (int) (mWidth / 2 + mWidth * circleProportion[0]), (int) (mHeight / 2 + mWidth * circleProportion[0])), mPaintCircle); } public interface IScanningListener { //正在扫描（此时还没有扫描完毕）时回调 void onScanning(int position, float scanAngle); //扫描成功时回调 void onScanSuccess(); } public void setMaxScanItemCount(int maxScanItemCount) { this.maxScanItemCount = maxScanItemCount; } /** * 开始扫描 */ public void startScan() { this.startScan = true; } }

四.完成小圆点的放置

现在我们的扫描图有了，对比发现我们还差啥？没错，就是小圆点

public class CircleView extends View { private Paint mPaint; private Bitmap mBitmap; private float radius = DisplayUtils.dp2px(getContext(),9);//半径 private float disX;//位置X private float disY;//位置Y private float angle;//旋转的角度 private float proportion;//根据远近距离的不同计算得到的应该占的半径比例 public float getProportion() { return proportion; } public void setProportion(float proportion) { this.proportion = proportion; } public float getAngle() { return angle; } public void setAngle(float angle) { this.angle = angle; } public float getDisX() { return disX; } public void setDisX(float disX) { this.disX = disX; } public float getDisY() { return disY; } public void setDisY(float disY) { this.disY = disY; } public CircleView(Context context) { this(context, null); } public CircleView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public CircleView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mPaint = new Paint(); mPaint.setColor(getResources().getColor(R.color.bg_color_pink)); mPaint.setAntiAlias(true); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); setMeasuredDimension(measureSize(widthMeasureSpec), measureSize(heightMeasureSpec)); } 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 = DisplayUtils.dp2px(getContext(),18); if (specMode == MeasureSpec.AT_MOST) { result = Math.min(result, specSize); } } return result; } @Override protected void onDraw(Canvas canvas) { canvas.drawCircle(radius, radius, radius, mPaint); if (mBitmap != null) { canvas.drawBitmap(mBitmap, null, new Rect(0, 0, 2 * (int) radius, 2 * (int) radius), mPaint); } } public void setPaintColor(int resId) { mPaint.setColor(resId); invalidate(); } public void setPortraitIcon(int resId) { mBitmap = BitmapFactory.decodeResource(getResources(), resId); invalidate(); } public void clearPortaitIcon(){ mBitmap = null; invalidate(); } }

有了小圆点，我们最后只需要把扫描图和小圆点放在一起就好了 因为我们是想变扫描变出现小圆点，所以我们需要在RadarView中定义一个接口IScanningListener，告诉RadarViewGroup我正在扫描，你快让小圆点出现吧

所以在RadarViewGroup的onScanning中需要调用requestLayout();

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item private CircleView minShowChild;//最小距离的item private 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); } @Override protected 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children measureChildren(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; } } } @Override protected 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() { @Override public 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Circle startAnim(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minItemPosition for (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CircleView for (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 0.312-0.832 circleView.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 */ @Override public 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 */ @Override public 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); } }

每次点击雷达图中的小圆点都会告诉ViewPager切换到指定的页面，所以RadarViewGroup中需要定义一个IRadarClickListener，让ViewPager所在的MainAcitivity去实现该接口

完成的效果就是这样了

五.总结

我们最终实现的效果还是挺棒的,通过实战，我们对于自定义View，自定义ViewGroup更加熟练啦~