Android开发仿IOS滑动开关实现代码

Android与iOS相比，ios好多控件都是自带的，而android需要使用自定义来实现。今天说的是ios的滑动开关，我层看到好多博客都是通过自定义ToggleButton实现的。这里我通过自定义view来实现他的效果。

首先在onsizechange里把2个半圆和一个矩形绘制出来。

width = w; height = h; left = top = 0; right = width; bottom = height * 0.8f; cx = (right + left) / 2; cy = (bottom + top) / 2; RectF rectF = new RectF(left, top, bottom, bottom); path.arcTo(rectF, 90, 180); rectF.left = right - bottom; rectF.right = right; path.arcTo(rectF, 270, 180); path.close(); circle_left = 0; circle_right = bottom; circle_width = circle_right - circle_left; float circle_height = (bottom - top) / 2; radius = circle_height * 0.9f; borderwidth = (int) (2 * (circle_height - radius)); circle_cx = width - circle_height;

剩下的就是ondraw方法来绘制颜色，以及切换的效果。

protected void onDraw(Canvas canvas) { super.onDraw(canvas); paint.setStyle(Style.FILL); paint.setAntiAlias(true); canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); if (isChoose) { paint.setColor(onColor); } else { paint.setColor(offColor); } canvas.drawPath(path, paint); isAnimation = isAnimation - 0.1f > 0 ? isAnimation - 0.1f : 0; //缩放大小参数随isAnimation变化而变化 final float scale = 0.98f * (isChoose ? isAnimation : 1 - isAnimation); //保存canvas状态 canvas.save(); canvas.scale(scale, scale, circle_cx, cy); paint.setColor(offColor); canvas.drawPath(path, paint); canvas.restore(); paint.reset(); float bTranslateX = width - circle_width; final float translate = bTranslateX * (isChoose ? 1 - isAnimation : isAnimation); canvas.translate(translate, 0); if (isAnimation > 0) { invalidate(); } canvas.save(); paint.setStyle(Style.FILL); paint.setColor(offColor); canvas.drawCircle(circle_width / 2, circle_width / 2, radius, paint); // 按钮白底 paint.setStyle(Style.STROKE); paint.setColor(borderColor); paint.setStrokeWidth(borderwidth); canvas.drawCircle(circle_width / 2, circle_width / 2, radius, paint); // 按钮灰边 canvas.restore(); }

最后我们在ontouch里面去改变他的状态：

public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: return true; case MotionEvent.ACTION_CANCEL: return true; case MotionEvent.ACTION_UP: isAnimation = 1; isChoose = !isChoose; listener.onStateChanged(isChoose); invalidate(); break; } return super.onTouchEvent(event); }

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