binView.gif

运用Path和Canvas旋转实现的效果

/*** 垃圾桶*/
public class BinView extends View {private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);private Bitmap bottomBitmap;//下面的高度private int bottomHeight = 50;//盖子宽度private int gaiziWidth = 100;//盖子初始Y坐标private int gaiziOffset;private Path gaiziPath;//旋转角度private float rotate = 1;public BinView(Context context) {super(context);}public BinView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);mPaint.setStyle(Paint.Style.STROKE);mPaint.setColor(Color.BLACK);mPaint.setStrokeWidth(5);mPaint.setStrokeCap(Paint.Cap.ROUND);}@Overrideprotected void onDraw(Canvas canvas) {int centerX = canvas.getWidth() / 2;int centerY = canvas.getHeight() / 2;if (bottomBitmap == null) {//缓冲bottomBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Bitmap.Config.ARGB_8888);Canvas bottomCanvas = new Canvas(bottomBitmap);//画中间三条竖线int spac = 10;//每条线的间距Path path1 = new Path();path1.moveTo(centerX, centerY);path1.lineTo(centerX, centerY + bottomHeight);Path path2 = new Path();path2.moveTo(centerX - spac, centerY);path2.lineTo(centerX - spac, centerY + bottomHeight);Path path3 = new Path();path3.moveTo(centerX + spac, centerY);path3.lineTo(centerX + spac, centerY + bottomHeight);bottomCanvas.drawPath(path1, mPaint);bottomCanvas.drawPath(path2, mPaint);bottomCanvas.drawPath(path3, mPaint);//底部int bottomWidth = 40;Path path4 = new Path();path4.moveTo(centerX - bottomWidth / 2, centerY + spac + bottomHeight);path4.lineTo(centerX + bottomWidth / 2, centerY + spac + bottomHeight);bottomCanvas.drawPath(path4, mPaint);//画左边斜线bottomCanvas.save();bottomCanvas.rotate(-15, centerX - bottomWidth / 2, centerY + spac + bottomHeight);Path path5 = new Path();path5.moveTo(centerX - bottomWidth / 2, centerY + spac + bottomHeight);path5.lineTo(centerX - bottomWidth / 2, centerY - spac);bottomCanvas.drawPath(path5, mPaint);bottomCanvas.restore();//画右边斜线bottomCanvas.save();bottomCanvas.rotate(15, centerX + bottomWidth / 2, centerY + spac + bottomHeight);Path path6 = new Path();path6.moveTo(centerX + bottomWidth / 2, centerY + spac + bottomHeight);path6.lineTo(centerX + bottomWidth / 2, centerY - spac);bottomCanvas.drawPath(path6, mPaint);bottomCanvas.restore();gaiziOffset = spac;}//画底部缓冲canvas.drawBitmap(bottomBitmap, 0, 0, mPaint);//画盖子if (gaiziPath == null) {gaiziPath = new Path();gaiziPath.moveTo(centerX - gaiziWidth / 2, centerY - gaiziOffset);gaiziPath.lineTo(centerX + gaiziWidth / 2, centerY - gaiziOffset);int gaiziHeadWidth = 10;gaiziPath.addRect(centerX - gaiziHeadWidth, centerY - gaiziHeadWidth - gaiziOffset, centerX + gaiziHeadWidth, centerY - gaiziOffset, Path.Direction.CW);}canvas.save();canvas.rotate(45 * (1 - rotate), centerX + gaiziWidth / 2, centerY - gaiziOffset);canvas.drawPath(gaiziPath, mPaint);canvas.restore();}@Overridepublic boolean onTouchEvent(MotionEvent event) {if (event.getAction() == MotionEvent.ACTION_DOWN) {startAnime();}return super.onTouchEvent(event);}private ValueAnimator valueAnimator;public void startAnime() {if (valueAnimator == null) {valueAnimator = ValueAnimator.ofFloat(1);valueAnimator.setInterpolator(new LinearInterpolator());valueAnimator.setDuration(1000);valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {rotate = (float) animation.getAnimatedValue();postInvalidate();}});}valueAnimator.start();}
}

项目地址：https://gitee.com/aruba/CanvasApplication.git