效果图：
源码地址：https://github.com/albertweijunfei/TopologicalView.git
首先准备工作：导入jar包，并add.
平移缩放操作jar包下载地址： （nineoldandroids-2.4.0.jar）
http://download.csdn.net/download/duoduo_11011/9758507
一.需求分析
1.根据扫描周边设备数目动态显示网络设备数目；
2.连接线根据设备的类型区别是实线还是虚线连接，虚线连接要加WiFi标志；
3.整个布局可两指操作缩放；
4.整个布局可单指操作平移；
二.思路分析
观察整个效果图我们不难发现中间的路由器设备是不变的可以一次为基准开始在onDraw方法里面通过canvas.Bitmap的方法先把中间的路由其设备画出来；
周边的是设备我们可以通过设备列表List来用for循环一次画出，那么画周边设备的第一个问题也就是位置怎么确定来了
这里我们不难发现可以通过设备数来平分360来划分设备区域-* 0 *-
连接线就取中间设备和周边设备对应角度的点就可以了
废话不多说了直接上代码 （代码中有明确注释）
三.代码
自定义控件类的代码：
public class AutoTopoView extends FrameLayout { private Context mContext; private Paint mTextPaint;//文本画笔 private Paint mCirclePaint; private Paint mDLinePaint;//虚线画笔 private Paint mRLinePaint;//实线画笔 private Path mPath; private PathEffect effects;//虚线化类 private int radiusX;//中心圆心X private int radiusY;//中心圆心Y private int DeviceRadiusX;//其他圆心X private int DeviceRadiusY;//其他圆心Y private float centerRadius;//中间设备半径 private float deviceRadius;//其他设备半径 private float wifiRadius;//WIFI设备半径 private int centerPointX;//连接线中起始点X private int centerPointY;//连接线中起始点Y private int devicePointX;//连接线中终止点X private int devicePointY;//连接线中终止点X private int betweenPointX;//连接线中中间点X private int betweenPointY;//连接线中中间点X //绘制的相关DATA private ArrayList<BitmapEntity> dataList; //需要先创建的Btimap的list private ArrayList<Bitmap> bitmapList = new ArrayList<>(); /** * 控制要绘图的部分 */ private Rect mSrcRect; /** * 控制要绘图的位置与大小 */ private RectF mDesRect; //平移缩放操作---> // 屏幕宽高 private int screenHeight; private int screenWidth; private ViewDragHelper mDragHelper; private long lastMultiTouchTime;// 记录多点触控缩放后的时间 private ScaleGestureDetector mScaleGestureDetector = null; public boolean isScale = false; private float scale; private float preScale = 1;// 默认前一次缩放比例为1 private boolean canTranslate = false;//是否能平移控制变量 private boolean canScale = false;//是否能缩放控制变量 private PointF lastPointF;//记录上次手指的位置 private float moveDistanceX = 0;//平移X距离 private float moveDistanceY = 0;//平移Y距离 private boolean isAllowTranslateLayout = true;//默认是否可以平移布局 默认为可以 true public AutoTopoView(@NonNull Context context) { super(context); } public AutoTopoView(@NonNull Context context, @Nullable AttributeSet attrs) { super(context, attrs); init(context); } public AutoTopoView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(Context context) { this.mContext = context; mCirclePaint = new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(Color.WHITE); mCirclePaint.setStrokeWidth(6); mCirclePaint.setStyle(Paint.Style.STROKE); //创建文本画笔 mTextPaint = new Paint(); mTextPaint.setStyle(Paint.Style.STROKE); mTextPaint.setAntiAlias(true); mTextPaint.setColor(Color.WHITE); mTextPaint.setTextSize(16); //创建实线画笔 mRLinePaint = new Paint(); mRLinePaint.setAntiAlias(true); mRLinePaint.setColor(Color.WHITE); mRLinePaint.setStrokeWidth(3); mRLinePaint.setStyle(Paint.Style.STROKE); //创建虚线画笔 mDLinePaint = new Paint(); mDLinePaint.setAntiAlias(true); mDLinePaint.setColor(Color.WHITE); mDLinePaint.setStrokeWidth(3); effects = new DashPathEffect(new float[] { 10f, 10f }, 0); mDLinePaint.setPathEffect(effects); mDLinePaint.setStyle(Paint.Style.STROKE); //路径Path mPath = new Path(); //缩放平移操作 mDragHelper = ViewDragHelper.create(this, callback); mScaleGestureDetector = new ScaleGestureDetector(context, new ScaleGestureListener()); lastPointF = new PointF(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); screenWidth = getMeasuredWidth(); screenHeight = getMeasuredHeight(); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { super.onInterceptTouchEvent(ev); return isScale; } private boolean needToHandle=true; @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getActionMasked()){ case MotionEvent.ACTION_DOWN: if (isAllowTranslateLayout){ canScale = false; canTranslate = true; lastPointF.set(event.getRawX(), event.getRawY()); } break; case MotionEvent.ACTION_MOVE: translateLayout(new PointF(event.getRawX(), event.getRawY())); break; case MotionEvent.ACTION_POINTER_DOWN: if (event.getPointerCount() == 2){ canScale = true; canTranslate = false; } break; case MotionEvent.ACTION_UP: canTranslate = false; break; case MotionEvent.ACTION_POINTER_UP: long currentTimeMillis = System.currentTimeMillis(); if (currentTimeMillis - lastMultiTouchTime > 200&&needToHandle) { // 多点触控全部手指抬起后要等待200毫秒才能执行单指触控的操作，避免多点触控后出现颤抖的情况 try { mDragHelper.processTouchEvent(event); } catch (Exception e) { e.printStackTrace(); } } canTranslate = false; break; } if (canScale){ return mScaleGestureDetector.onTouchEvent(event);//让mScaleGestureDetector处理触摸事件 }else { return true; } } @Override public boolean onInterceptHoverEvent(MotionEvent event) { super.onInterceptTouchEvent(event); return isScale; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); radiusX = getWidth()/2; radiusY = getHeight()/2; // Log.e("TAG", "radiusX; "+ radiusX+" radiusY:"+radiusY); } //初始化Bitmap private void initBitmap() { if (dataList != null){ if (dataList.size()>0){ for (int i=0; i<dataList.size(); i++){ Bitmap b = ((BitmapDrawable)mContext.getResources().getDrawable(dataList.get(i).getId())).getBitmap(); bitmapList.add(b); } //准备需要绘制bitmap的区域（公共） mSrcRect = new Rect(0,0,bitmapList.get(0).getWidth(),bitmapList.get(0).getHeight()); } } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //postInvalidate() 会重新调用onDraw方法 //刷新onDraw时重置bitmapList if (bitmapList.size()>0){ bitmapList.clear(); } initBitmap(); //先画中间的bitmap deviceRadius = getWidth()/(2*10); centerRadius = deviceRadius*(1.5f); mDesRect = new RectF(radiusX - centerRadius, radiusY - centerRadius, radiusX + centerRadius, radiusY + centerRadius); canvas.drawBitmap(((BitmapDrawable)mContext.getResources().getDrawable(R.mipmap.logo_shanzhai)).getBitmap(), mSrcRect, mDesRect, null); //画设备和连接线 drawDeviceAndLine(canvas); } /** * 画文本 * @param canvas * @param count 计数 */ private void drawText(Canvas canvas, int count) { //根据象限画对应文本 String name = dataList.get(count).getName().trim(); float strLength = mTextPaint.measureText(name); if (betweenPointX>=radiusX&&betweenPointY>=radiusY){//第二象限 canvas.drawText(name, DeviceRadiusX, DeviceRadiusY + 20 + deviceRadius, mTextPaint); }else if (betweenPointX>=radiusX&&betweenPointY<=radiusY){//第一象限 canvas.drawText(name, DeviceRadiusX, DeviceRadiusY - deviceRadius - 3, mTextPaint); }else if (betweenPointX<=radiusX&&betweenPointY>=radiusY){//第三象限 canvas.drawText(name, DeviceRadiusX - strLength, DeviceRadiusY + 20 + deviceRadius, mTextPaint); } else if (betweenPointX<=radiusX&&betweenPointY<=radiusY){//第四象限 canvas.drawText(name, DeviceRadiusX - strLength, DeviceRadiusY - 3 - deviceRadius, mTextPaint); } } /** * 画其他设备和连接线 * @param canvas */ private void drawDeviceAndLine(Canvas canvas) { if (dataList != null){ if (dataList.size()>0){ int averageAngle = 360/(dataList.size()); for (int i = 0;i<dataList.size();i++){ calculatePoint(i*averageAngle, averageAngle); mDesRect = new RectF(DeviceRadiusX - deviceRadius, DeviceRadiusY - deviceRadius, DeviceRadiusX + deviceRadius, DeviceRadiusY + deviceRadius); canvas.drawBitmap(bitmapList.get(i), mSrcRect, mDesRect, null); if (dataList.get(i).getType() == 0){ mPath.reset(); mPath.moveTo(centerPointX, centerPointY); mPath.cubicTo(centerPointX, centerPointY, betweenPointX, betweenPointY, devicePointX, devicePointY); canvas.drawPath(mPath, mDLinePaint); //如果是虚线连接需要加WI-FI图标 mDesRect = new RectF(betweenPointX - (deviceRadius*0.4f), betweenPointY - (deviceRadius*0.4f), betweenPointX + (deviceRadius*0.4f), betweenPointY + (deviceRadius*0.4f)); canvas.drawBitmap(((BitmapDrawable)mContext.getResources().getDrawable(R.mipmap.wifi)).getBitmap(), mSrcRect, mDesRect, null); }else if (dataList.get(i).getType() == 1){ //每次重置path 不然会错乱 mPath.reset(); mPath.moveTo(centerPointX, centerPointY); mPath.cubicTo(centerPointX, centerPointY, betweenPointX, betweenPointY, devicePointX, devicePointY); canvas.drawPath(mPath, mRLinePaint); } //画文本 drawText(canvas, i); } } } } /** * 计算坐标和偏移值 * @param initAngle 每个设备区间的初始角度 * @param avAngle 每个设备区间的终止角度 */ private void calculatePoint(int initAngle, int avAngle){ //计算每个区间的中间角度值 double confirmAngle = (double)(initAngle + (avAngle/2)); //生成一个随机数来控制其他设备的圆心点的随机位置 Random random = new Random(); int offset = random.nextInt(50); // Log.e("TAG", "offset; "+ offset); //计算其他设备的圆心 DeviceRadiusX = radiusX + (int)((radiusX - 70 - offset)*Math.sin(Math.toRadians(confirmAngle))); DeviceRadiusY = radiusY - (int)((radiusY - 70 - offset)*Math.cos(Math.toRadians(confirmAngle))); // Log.e("TAG", "initAngle: "+initAngle+" averageAngle: "+avAngle+" ANGLE: "+confirmAngle+" X; "+ DeviceRadiusX+" Y: "+DeviceRadiusY); //计算连接线起始点的坐标 centerPointX = radiusX + (int)(centerRadius*Math.sin(Math.toRadians(confirmAngle))); centerPointY = radiusY - (int)(centerRadius*Math.cos(Math.toRadians(confirmAngle))); //计算连接线终止点的坐标 devicePointX = DeviceRadiusX - (int)(deviceRadius*Math.sin(Math.toRadians(confirmAngle))); devicePointY = DeviceRadiusY + (int)(deviceRadius*Math.cos(Math.toRadians(confirmAngle))); //计算连接线中间点的坐标 int offsetX = (int)((centerRadius*1.5f)*Math.sin(Math.toRadians(avAngle/2))); if (devicePointX>radiusX){ betweenPointX = radiusX + (devicePointX - radiusX)/2 ; }else { betweenPointX = devicePointX + (radiusX - devicePointX)/2 ; } if (devicePointY>radiusY){ betweenPointY = devicePointY + (radiusY - devicePointY)/2 ; }else { betweenPointY = radiusY + (devicePointY - radiusY)/2 ; } //以中间圆心为坐标原点根据象限计算贝塞尔中间点的坐标(制造伪随机) if (betweenPointX>=radiusX&&betweenPointY>=radiusY){//第二象限 betweenPointX = betweenPointX + offsetX; betweenPointY = betweenPointY - offsetX; }else if (betweenPointX>=radiusX&&betweenPointY<=radiusY){//第一象限 betweenPointX = betweenPointX - offsetX; betweenPointY = betweenPointY - offsetX; }else if (betweenPointX<=radiusX&&betweenPointY>=radiusY){//第三象限 betweenPointX = betweenPointX - offsetX; betweenPointY = betweenPointY - offsetX; } else if (betweenPointX<=radiusX&&betweenPointY<=radiusY){//第四象限 betweenPointX = betweenPointX + offsetX; betweenPointY = betweenPointY - offsetX; } } //调用此方法可重新执行onDraw方法 新建View和数据改变是调用此方法 public void setData(ArrayList<BitmapEntity> be){ this.dataList = be; postInvalidate(); } /** * 开放给外部设置是否允许平移布局 * @param isAllowTranslate */ public void canTranslateLayout(boolean isAllowTranslate){ this.isAllowTranslateLayout = isAllowTranslate; } /************************************************平移缩放********************************************************/ private ViewDragHelper.Callback callback = new ViewDragHelper.Callback() { /** * 用于判断是否捕获当前child的触摸事件 * * @param child * 当前触摸的子view * @param pointerId * @return true就捕获并解析；false不捕获 */ @Override public boolean tryCaptureView(View child, int pointerId) { if (preScale > 1){ return true; } return false; } /** * 控制水平方向上的位置 */ @Override public int clampViewPositionHorizontal(View child, int left, int dx) { if (left < (screenWidth - screenWidth * preScale) / 2) left = (int) (screenWidth - screenWidth * preScale) / 2;// 限制mainView可向左移动到的位置 if (left > (screenWidth * preScale - screenWidth) / 2) left = (int) (screenWidth * preScale - screenWidth) / 2;// 限制mainView可向右移动到的位置 return left; } public int clampViewPositionVertical(View child, int top, int dy) { if (top < (screenHeight - screenHeight * preScale) / 2) { top = (int) (screenHeight - screenHeight * preScale) / 2;// 限制mainView可向上移动到的位置 } if (top > (screenHeight * preScale - screenHeight) / 2) { top = (int) (screenHeight * preScale - screenHeight) / 2;// 限制mainView可向上移动到的位置 } return top; } }; public class ScaleGestureListener implements ScaleGestureDetector.OnScaleGestureListener { @Override public boolean onScale(ScaleGestureDetector detector) { float previousSpan = detector.getPreviousSpan();// 前一次双指间距 float currentSpan = detector.getCurrentSpan();// 本次双指间距 if (currentSpan < previousSpan) { // 缩小 scale = preScale - (previousSpan - currentSpan) / 750; } else { // 放大 scale = preScale + (currentSpan - previousSpan) / 750; } // 缩放view if (scale > 0.5 && scale<1.5) { ViewHelper.setScaleX(AutoTopoView.this, scale);// x方向上缩放 ViewHelper.setScaleY(AutoTopoView.this, scale);// y方向上缩放 } return false; } @Override public boolean onScaleBegin(ScaleGestureDetector detector) { // 一定要返回true才会进入onScale()这个函数 return true; } @Override public void onScaleEnd(ScaleGestureDetector detector) { preScale = scale;// 记录本次缩放比例 lastMultiTouchTime = System.currentTimeMillis();// 记录双指缩放后的时间 } } /** * 平移布局操作 * @param pf */ private void translateLayout(PointF pf){ if (canTranslate){ moveDistanceX = pf.x - lastPointF.x; moveDistanceY = pf.y - lastPointF.y; ViewHelper.setTranslationX(AutoTopoView.this, moveDistanceX); ViewHelper.setTranslationY(AutoTopoView.this, moveDistanceY); } } }
Activity的代码：
public class MainActivity extends AppCompatActivity { private AutoTopoView mAutoTopoView; private ArrayList<BitmapEntity> list = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mAutoTopoView = findViewById(R.id.AutoTopoView); initData(); } private void initData() { BitmapEntity b1 = new BitmapEntity(); b1.setName("锤子科技"); b1.setId(R.mipmap.logo_smartisan); b1.setType(0); list.add(b1); BitmapEntity b2 = new BitmapEntity(); b2.setName("iPhone"); b2.setId(R.mipmap.logo_apple); b2.setType(0); list.add(b2); BitmapEntity b3 = new BitmapEntity(); b3.setName("MEIZU"); b3.setId(R.mipmap.logo_meizu); b3.setType(0); list.add(b3); BitmapEntity b4 = new BitmapEntity(); b4.setName("NOKIA"); b4.setId(R.mipmap.logo_nokia); b4.setType(0); list.add(b4); BitmapEntity b5 = new BitmapEntity(); b5.setName("Pad"); b5.setId(R.mipmap.logo_samsung); b5.setType(0); list.add(b5); BitmapEntity b6 = new BitmapEntity(); b6.setName("索尼科技"); b6.setId(R.mipmap.logo_sony); b6.setType(0); list.add(b6); BitmapEntity b7 = new BitmapEntity(); b7.setName("Windows-PC"); b7.setId(R.mipmap.logo_honghai); b7.setType(1); list.add(b7); BitmapEntity b8 = new BitmapEntity(); b8.setName("UNKOWN"); b8.setId(R.mipmap.logo_router_unkown); b8.setType(1); list.add(b8); BitmapEntity b9 = new BitmapEntity(); b9.setName("锤子科技"); b9.setId(R.mipmap.logo_smartisan); b9.setType(0); list.add(b9); BitmapEntity b10 = new BitmapEntity(); b10.setName("iPhone"); b10.setId(R.mipmap.logo_apple); b10.setType(0); list.add(b10); BitmapEntity b11 = new BitmapEntity(); b11.setName("MEIZU"); b11.setId(R.mipmap.logo_meizu); b11.setType(0); list.add(b11); BitmapEntity b12 = new BitmapEntity(); b12.setName("NOKIA"); b12.setId(R.mipmap.logo_nokia); b12.setType(0); list.add(b12); BitmapEntity b13 = new BitmapEntity(); b13.setName("Pad"); b13.setId(R.mipmap.logo_samsung); b13.setType(0); list.add(b13); BitmapEntity b14 = new BitmapEntity(); b14.setName("索尼科技"); b14.setId(R.mipmap.logo_sony); b14.setType(0); list.add(b14); BitmapEntity b15 = new BitmapEntity(); b15.setName("Windows-PC"); b15.setId(R.mipmap.logo_honghai); b15.setType(1); list.add(b15); BitmapEntity b16 = new BitmapEntity(); b16.setName("UNKOWN"); b16.setId(R.mipmap.logo_router_unkown); b16.setType(1); list.add(b16); mAutoTopoView.setData(list); // mAutoTopoView.canTranslateLayout(false); } }四.扩展
如果有需要旋转的可以自行添加 ViewHelper类里面有相关方法可以自己了解