public class GuideView extends RelativeLayout implements ViewTreeObserver.OnGlobalLayoutListener {  PRivate final String TAG = getClass().getSimpleName();  private Context mContent;  private List<View> mViews;  private boolean First = true;  /**   * targetView前缀。SHOW_GUIDE_PREFIX + targetView.getId()作为保存在SP文件的key。   */  private static final String SHOW_GUIDE_PREFIX = "show_guide_on_view_";  /**   * GuideView 偏移量   */  private int offsetX, offsetY;  /**   * targetView 的外切圆半径   */  private int radius;  /**   * 需要显示提示信息的View   */  private View targetView;  /**   * 自定义View   */  private View customGuideView;  /**   * 透明圆形画笔   */  private Paint mCirclePaint;  /**   * 背景色画笔   */  private Paint mBackgroundPaint;  /**   * targetView是否已测量   */  private boolean isMeasured;  /**   * targetView圆心   */  private int[] center;  /**   * 绘图层叠模式   */  private PorterDuffXfermode porterDuffXfermode;  /**   * 绘制前景bitmap   */  private Bitmap bitmap;  /**   * 背景色和透明度，格式 #aarrggbb   */  private int backgroundColor;  /**   * Canvas,绘制bitmap   */  private Canvas temp;  /**   * 相对于targetView的位置.在target的那个方向   */  private Direction direction;    /**   * 形状   */  private MyShape myShaPE;  /**   * targetView左上角坐标   */  private int[] location;  private boolean onClickExit;  private OnClickCallback onclickListener;  private RelativeLayout guideViewLayout;    public void reStoreState() {   LOG.v(TAG, "restoreState");   offsetX = offsetY = 0;   radius = 0;   mCirclePaint = null;   mBackgroundPaint = null;   isMeasured = false;   center = null;   porterDuffXfermode = null;   bitmap = null;   needDraw = true;   //  backgroundColor = Color.parseColor("#00000000");   temp = null;   //  direction = null;    }    public int[] getLocation() {   return location;  }    public void setLocation(int[] location) {   this.location = location;  }    public GuideView(Context context) {   super(context);   this.mContent = context;   init();  }    public int getRadius() {   return radius;  }    public void setRadius(int radius) {   this.radius = radius;  }    public void setOffsetX(int offsetX) {   this.offsetX = offsetX;  }    public void setOffsetY(int offsetY) {   this.offsetY = offsetY;  }    public void setDirection(Direction direction) {   this.direction = direction;  }    public void setShape(MyShape shape) {   this.myShape = shape;  }    public void setCustomGuideView(View customGuideView) {   this.customGuideView = customGuideView;   if (!first) {    restoreState();   }  }    public void setBgColor(int background_color) {   this.backgroundColor = background_color;  }    public View getTargetView() {   return targetView;  }    public void setTargetView(View targetView) {   this.targetView = targetView;   //  restoreState();   if (!first) {    //   guideViewLayout.removeAllViews();   }  }    private void init() {  }    public void showOnce() {   if (targetView != null) {    mContent.getSharedPreferences(TAG, Context.MODE_PRIVATE).edit().putBoolean(generateUniqId(targetView), true).COMmit();   }  }    private boolean hasShown() {   if (targetView == null)    return true;   return mContent.getSharedPreferences(TAG, Context.MODE_PRIVATE).getBoolean(generateUniqId(targetView), false);  }    private String generateUniqId(View v) {   return SHOW_GUIDE_PREFIX + v.getId();  }    public int[] getCenter() {   return center;  }    public void setCenter(int[] center) {   this.center = center;  }    public void hide() {   Log.v(TAG, "hide");   if (customGuideView != null) {    targetView.getViewTreeObserver().removeOnGlobalLayoutListener(this);    this.removeAllViews();    ((FrameLayout) ((Activity) mContent).getWindow().getDecorView()).removeView(this);    restoreState();   }  }    public void show() {   Log.v(TAG, "show");   if (hasShown())    return;     if (targetView != null) {    targetView.getViewTreeObserver().addOnGlobalLayoutListener(this);   }     this.setBackgroundResource(R.color.transparent);     ((FrameLayout) ((Activity) mContent).getWindow().getDecorView()).addView(this);   first = false;  }    /**   * 添加提示文字，位置在targetView的下边   * 在屏幕窗口，添加蒙层，蒙层绘制总背景和透明圆形，圆形下边绘制说明文字   */  private void createGuideView() {   Log.v(TAG, "createGuideView");     // 添加到蒙层   //  if (guideViewLayout == null) {   //   guideViewLayout = new RelativeLayout(mContent);   //  }     // Tips布局参数   LayoutParams guideViewParams;   guideViewParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);   guideViewParams.setMargins(0, center[1] + radius + 10, 0, 0);     if (customGuideView != null) {      //   LayoutParams guideViewParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);    if (direction != null) {     int width = this.getWidth();     int height = this.getHeight();       int left = center[0] - radius;     int right = center[0] + radius;     int top = center[1] - radius;     int bottom = center[1] + radius;     switch (direction) {      case TOP:       this.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL);       guideViewParams.setMargins(offsetX, offsetY - height + top, -offsetX, height - top - offsetY);       break;      case LEFT:       this.setGravity(Gravity.RIGHT);       guideViewParams.setMargins(offsetX - width + left, top + offsetY, width - left - offsetX, -top - offsetY);       break;      case BOTTOM:       this.setGravity(Gravity.CENTER_HORIZONTAL);       guideViewParams.setMargins(offsetX, bottom + offsetY, -offsetX, -bottom - offsetY);       break;      case RIGHT:       guideViewParams.setMargins(right + offsetX, top + offsetY, -right - offsetX, -top - offsetY);       break;      case LEFT_TOP:       this.setGravity(Gravity.RIGHT | Gravity.BOTTOM);       guideViewParams.setMargins(offsetX - width + left, offsetY - height + top, width - left - offsetX, height - top - offsetY);       break;      case LEFT_BOTTOM:       this.setGravity(Gravity.RIGHT);       guideViewParams.setMargins(offsetX - width + left, bottom + offsetY, width - left - offsetX, -bottom - offsetY);       break;      case RIGHT_TOP:       this.setGravity(Gravity.BOTTOM);       guideViewParams.setMargins(right + offsetX, offsetY - height + top, -right - offsetX, height - top - offsetY);       break;      case RIGHT_BOTTOM:       guideViewParams.setMargins(right + offsetX, bottom + offsetY, -right - offsetX, -top - offsetY);       break;     }    } else {     guideViewParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);     guideViewParams.setMargins(offsetX, offsetY, -offsetX, -offsetY);    }      //   guideViewLayout.addView(customGuideView);      this.addView(customGuideView, guideViewParams);   }  }    /**   * 获得targetView 的宽高，如果未测量，返回｛-1， -1｝   *   * @return   */  private int[] getTargetViewSize() {   int[] location = {-1, -1};   if (isMeasured) {    location[0] = targetView.getWidth();    location[1] = targetView.getHeight();   }   return location;  }    /**   * 获得targetView 的半径   *   * @return   */  private int getTargetViewRadius() {   if (isMeasured) {    int[] size = getTargetViewSize();    int x = size[0];    int y = size[1];      return (int) (Math.sqrt(x * x + y * y) / 2);   }   return -1;  }    boolean needDraw = true;    @override  protected void onDraw(Canvas canvas) {   super.onDraw(canvas);   Log.v(TAG, "onDraw");     if (!isMeasured)    return;     if (targetView == null)    return;     //  if (!needDraw) return;     drawBackground(canvas);    }    private void drawBackground(Canvas canvas) {   Log.v(TAG, "drawBackground");   needDraw = false;   // 先绘制bitmap，再将bitmap绘制到屏幕   bitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.config.ARGB_8888);   temp = new Canvas(bitmap);     // 背景画笔   Paint bgPaint = new Paint();   if (backgroundColor != 0)    bgPaint.setColor(backgroundColor);   else    bgPaint.setColor(getResources().getColor(R.color.shadow));     // 绘制屏幕背景   temp.drawRect(0, 0, temp.getWidth(), temp.getHeight(), bgPaint);     // targetView 的透明圆形画笔   if (mCirclePaint == null)    mCirclePaint = new Paint();   porterDuffXfermode = new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT);// 或者CLEAR   mCirclePaint.setXfermode(porterDuffXfermode);   mCirclePaint.setAntiAlias(true);     if (myShape != null) {    RectF oval = new RectF();    switch (myShape) {     case CIRCULAR://圆形      temp.drawCircle(center[0], center[1], radius, mCirclePaint);//绘制圆形      break;     case ELLIPSE://椭圆      //RectF对象      oval.left = center[0] - 150;        //左边      oval.top = center[1] - 50;         //上边      oval.right = center[0] + 150;        //右边      oval.bottom = center[1] + 50;        //下边      temp.drawOval(oval, mCirclePaint);     //绘制椭圆      break;     case RECTAngular://圆角矩形      //RectF对象      oval.left = center[0] - 150;        //左边      oval.top = center[1] - 50;         //上边      oval.right = center[0] + 150;        //右边      oval.bottom = center[1] + 50;        //下边      temp.drawRoundRect(oval, radius, radius, mCirclePaint);     //绘制圆角矩形      break;    }   } else {    temp.drawCircle(center[0], center[1], radius, mCirclePaint);//绘制圆形   }     // 绘制到屏幕   canvas.drawBitmap(bitmap, 0, 0, bgPaint);   bitmap.recycle();  }    public void setOnClickExit(boolean onClickExit) {   this.onClickExit = onClickExit;  }    public void setOnclickListener(OnClickCallback onclickListener) {   this.onclickListener = onclickListener;  }    private void setClickInfo() {   final boolean exit = onClickExit;   setOnClickListener(new OnClickListener() {    @Override    public void onClick(View v) {     if (onclickListener != null) {      onclickListener.onClickedGuideView();     }     if (exit) {      hide();     }    }   });  }    @Override  public void onGlobalLayout() {   if (isMeasured)    return;   if (targetView.getHeight() > 0 && targetView.getWidth() > 0) {    isMeasured = true;   }     // 获取targetView的中心坐标   if (center == null) {    // 获取右上角坐标    location = new int[2];    targetView.getLocationInWindow(location);    center = new int[2];    // 获取中心坐标    center[0] = location[0] + targetView.getWidth() / 2;    center[1] = location[1] + targetView.getHeight() / 2;   }   // 获取targetView外切圆半径   if (radius == 0) {    radius = getTargetViewRadius();   }   // 添加GuideView   createGuideView();  }    /**   * 定义GuideView相对于targetView的方位，共八种。不设置则默认在targetView下方   */  enum Direction {   LEFT, TOP, RIGHT, BOTTOM,   LEFT_TOP, LEFT_BOTTOM,   RIGHT_TOP, RIGHT_BOTTOM  }    /**   * 定义目标控件的形状，共3种。圆形，椭圆，带圆角的矩形（可以设置圆角大小），不设置则默认是圆形   */  enum MyShape {   CIRCULAR, ELLIPSE, RECTANGULAR  }    /**   * GuideView点击Callback   */  interface OnClickCallback {   void onClickedGuideView();  }    public static class Builder {   static GuideView guiderView;   static Builder instance = new Builder();   Context mContext;     private Builder() {   }     public Builder(Context ctx) {    mContext = ctx;   }     public static Builder newInstance(Context ctx) {    guiderView = new GuideView(ctx);    return instance;   }     public Builder setTargetView(View target) {    guiderView.setTargetView(target);    return instance;   }     public Builder setBgColor(int color) {    guiderView.setBgColor(color);    return instance;   }     public Builder setDirction(Direction dir) {    guiderView.setDirection(dir);    return instance;   }     public Builder setShape(MyShape shape) {    guiderView.setShape(shape);    return instance;   }     public Builder setOffset(int x, int y) {    guiderView.setOffsetX(x);    guiderView.setOffsetY(y);    return instance;   }     public Builder setRadius(int radius) {    guiderView.setRadius(radius);    return instance;   }     public Builder setCustomGuideView(View view) {    guiderView.setCustomGuideView(view);    return instance;   }     public Builder setCenter(int X, int Y) {    guiderView.setCenter(new int[]{X, Y});    return instance;   }     public Builder showOnce() {    guiderView.showOnce();    return instance;   }     public GuideView build() {    guiderView.setClickInfo();    return guiderView;   }     public Builder setOnclickExit(boolean onclickExit) {    guiderView.setOnClickExit(onclickExit);    return instance;   }     public Builder setOnclickListener(final OnClickCallback callback) {    guiderView.setOnclickListener(callback);    return instance;   }  } } 导入后，在你想要使用蒙层的类中，使用也非常简单  首先我们来初始化一个蒙层   GuideView guideView = GuideView.Builder     .newInstance(this)     .setTargetView(menu)//设置目标     .setCustomGuideView(iv)//设置蒙层上面使用的图片     .setDirction(GuideView.Direction.LEFT_BOTTOM)     .setShape(GuideView.MyShape.CIRCULAR) // 设置圆形显示区域，     .setBgColor(getResources().getColor(R.color.shadow))     .setOnclickListener(new GuideView.OnClickCallback() {      @Override      public void onClickedGuideView() {       guideView.hide();             }     })     .build();