Android自定义View——qq消息气泡

效果图：

原理：

控件源码：

public class DragView extends View {private int defaultZoomSize = 8;//初始化圆的大小private int initRadius;//圆1的圆心位置private PointF center1;private PointF center2;private PointF point1;private PointF point2;private PointF point3;private PointF point4;private int mWidth;private int mHeight;private float realZoomSize;private float currentRadius;private float minRadiusScale = 1 / 2f;private Paint paint;private Path path;private Bitmap bitmap;@DragStatusprivate int mDragStatus;public DragView(Context context) {this(context, null);}public DragView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public DragView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);paint = new Paint();paint.setColor(Color.BLUE);paint.setStyle(Paint.Style.FILL);paint.setStrokeWidth(4);paint.setAntiAlias(true);path = new Path();center1 = new PointF();center2 = new PointF();point1 = new PointF();point2 = new PointF();point3 = new PointF();point4 = new PointF();bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.icon_pot);initRadius = Math.min(bitmap.getWidth(), bitmap.getHeight()) / 2;Log.e("zhen", "解析bitmap: " + bitmap.getWidth() + " * " + bitmap.getHeight() + " * " + initRadius);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);mWidth = w;mHeight = h;center1.set(mWidth / 2, mHeight / 2);Log.d("zhen", "圆心位置：x" + center1.x + " y: " + center1.y);}private boolean isSelected = false;@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX();float y = event.getY();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:if (Math.sqrt(Math.pow(x - center1.x, 2) + Math.pow(y - center1.y, 2)) < initRadius&& mDragStatus == DragStatus.NORMAL) {inAnimation = false;isSelected = true;Log.e("zhen", "选中状态");}break;case MotionEvent.ACTION_MOVE:if (isSelected) {
//                    Log.d("zhen", "拖动距离： " + dragDistance);if (mDragStatus != DragStatus.DRAG_BACK && mDragStatus != DragStatus.DRAG_TO) {mDragStatus = DragStatus.DRAG_MOVE;center2.set(x, y);float dragDistance = (float) (Math.sqrt(Math.pow(center2.x - center1.x, 2)+ Math.pow(center2.y - center1.y, 2)));//多少倍圆的大小realZoomSize = dragDistance / initRadius;invalidate();}}break;case MotionEvent.ACTION_UP:if (isSelected) {if (realZoomSize <= defaultZoomSize) {//回弹，改变center2.x, center2.y直到等于center1.x, center1.ydoAnimation(DragStatus.DRAG_BACK, center2, center1);}}isSelected = false;break;}return true;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//圆的半径改变currentRadius = initRadius * (1 + (minRadiusScale - 1) / defaultZoomSize * realZoomSize);if (realZoomSize > defaultZoomSize) {//圆缩小为一半，去往目的地，就应该消失了doAnimation(DragStatus.DRAG_TO, center1, center2);}//中间矩形
//        paint.setColor(Color.BLACK);float angle = (float) Math.atan((center2.y - center1.y) / (center2.x - center1.x));float sinValue;float cosValue;float controlX;float controlY;sinValue = (float) Math.abs((currentRadius * Math.sin(angle)));cosValue = (float) Math.abs((currentRadius * Math.cos(angle)));controlX = (center1.x + center2.x) / 2;controlY = (center1.y + center2.y) / 2;point1.set(center1.x - sinValue, center1.y - cosValue);point2.set(center1.x + sinValue, center1.y + cosValue);point3.set(center2.x - sinValue, center2.y - cosValue);point4.set(center2.x + sinValue, center2.y + cosValue);path.reset();switch (mDragStatus) {case DragStatus.NORMAL:currentRadius = initRadius;//原始图片canvas.drawBitmap(bitmap, center1.x - initRadius, center1.y - initRadius, paint);//起始位置的圆
//                paint.setColor(Color.RED);
//                canvas.drawCircle(center1.x, center1.y, currentRadius, paint);break;case DragStatus.DRAG_MOVE://拖动过程中path.moveTo(point1.x, point1.y);path.lineTo(point2.x, point2.y);path.quadTo(controlX, controlY, point4.x, point4.y);path.lineTo(point3.x, point3.y);path.quadTo(controlX, controlY, point1.x, point1.y);canvas.drawPath(path, paint);//起始位置的圆paint.setColor(Color.RED);canvas.drawCircle(center1.x, center1.y, currentRadius, paint);//结束位置的圆
//                paint.setColor(Color.BLUE);
//                canvas.drawCircle(center2.x, center2.y, currentRadius, paint);//原始图片canvas.drawBitmap(bitmap, center2.x - initRadius, center2.y - initRadius, paint);break;case DragStatus.DRAG_BACK://改变center2.x, center2.y直到等于center1.x, center1.ypath.reset();path.moveTo(point1.x, point1.y);path.quadTo(center2.x, center2.y, point2.x, point2.y);canvas.drawPath(path, paint);//起始位置的圆
//                paint.setColor(Color.RED);
//                canvas.drawCircle(center1.x, center1.y, currentRadius, paint);//原始图片canvas.drawBitmap(bitmap, center1.x - initRadius, center1.y - initRadius, paint);break;case DragStatus.DRAG_TO://改变center1.x, center1.y,直到等于center2.x, center2.ypath.reset();path.moveTo(point3.x, point3.y);path.quadTo(center1.x, center1.y, point4.x, point4.y);canvas.drawPath(path, paint);
//                //起始位置的圆
//                paint.setColor(Color.RED);
//                canvas.drawCircle(center1.x, center1.y, currentRadius, paint);
//                //结束位置的圆
//                paint.setColor(Color.BLUE);
//                canvas.drawCircle(center2.x, center2.y, currentRadius, paint);//原始图片canvas.drawBitmap(bitmap, center2.x - initRadius, center2.y - initRadius, paint);break;}
//        Log.d("zhen", "dragStatus: " + mDragStatus + " 圆1：" + center1 + " 圆2：" + center2 + " 半径： " + currentRadius);
//        Log.w("zhen", "dragStatus: " + mDragStatus + " point3：" + point3 + " point4" + point4 + " sinValue " + sinValue + " cosValue " + cosValue);Log.w("zhen", "dragStatus: " + mDragStatus + " 圆1：" + center1 + " 圆2：" + center2 + " 半径： " + currentRadius);}int i = 0;private boolean inAnimation = false;private void doAnimation(int dragStatus, final PointF startPoint, final PointF endPoint) {if (inAnimation) return;inAnimation = true;final int step = 10;final float stepx = (endPoint.x - startPoint.x) / step;final float stepy = (endPoint.y - startPoint.y) / step;i = 1;mDragStatus = dragStatus;Log.d("zhen", "dragStatus: " + mDragStatus + " startPoint：" + startPoint+ " endPoint：" + endPoint + " stepx： " + stepy + " stepx： " + stepy);new Thread(new Runnable() {@Overridepublic void run() {while (i <= step) {startPoint.x += stepx;startPoint.y += stepy;postInvalidate();i++;try {Thread.sleep(50);} catch (InterruptedException e) {e.printStackTrace();}}mDragStatus = DragStatus.NORMAL;invalidate();Log.e("zhen", "恢复为可拖动状态");}}).start();}@IntDef({DragStatus.DRAG_MOVE, DragStatus.DRAG_TO, DragStatus.DRAG_BACK})public @interface DragStatus {int NORMAL = 0;//拖动中int DRAG_MOVE = 1;//int DRAG_TO = 2;//回弹int DRAG_BACK = 3;}}

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