自定义view写了这么多篇幅,通用的属性部分代码,测量代码忽略不计
真正实现的部分就不到100行!先上效果图
关闭状态
打开状态
动起来
下面我们看下我们的实现;
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawSwichBg(canvas);
drawSwichBallByFlag(canvas);
}
private void drawSwichBallByFlag(Canvas canvas) {
// 绘制滑动的小球
canvas.drawCircle(swichBallx, strockRadio, solidRadio, viewBallPaint);
}
private void drawSwichBg(Canvas canvas) {
// 绘制圆角背景
canvas.drawRoundRect(bgStrockRectF, strockRadio, strockRadio, viewStrockPaint);
canvas.drawRoundRect(bgRectF, solidRadio, solidRadio, viewBgPaint);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
viewHeight = h;
viewWidth = w;
//计算小球半径和圆角背景的矩形范围
strockRadio = viewHeight / 2;
solidRadio = (viewHeight - 2 * switchViewStrockWidth) / 2;
swichBallx = strockRadio;
bgStrockRectF = new RectF(0, 0, viewWidth, viewHeight);
bgRectF = new RectF(switchViewStrockWidth, switchViewStrockWidth, viewWidth - switchViewStrockWidth, viewHeight - switchViewStrockWidth);
}
public void setOpenState(boolean openState) {
//根据小球的开关状态,重置小球位置
isOpen = openState;
swichBallx = isOpen ? viewWidth - strockRadio : strockRadio;
int currentStrockColor = isOpen ? switchViewBgOpenColor : switchViewStrockColor;
int currentBgColor = isOpen ? switchViewBgOpenColor : switchViewBgCloseColor;
viewStrockPaint.setColor(currentStrockColor);
viewBgPaint.setColor(currentBgColor);
}
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
// 小球跟随手指移动,并且限制边界范围
int moveX = (int) event.getX();
if (moveX < strockRadio) {
moveX = strockRadio;
}
if (moveX > viewWidth - strockRadio) {
moveX = viewWidth - strockRadio;
}
swichBallx = moveX;
break;
case MotionEvent.ACTION_UP:
// 手指离开时,根据up的坐标设置view的开关状态
int upX = (int) event.getX();
if (upX > viewWidth / 2) {
setOpenState(true);
} else {
setOpenState(false);
}
break;
}
invalidate();
return true;
}
核心代码结束,由于开关滑块比较小就没有加入弹性滑动以及属性动画 有兴趣的可以加一个valueanimion在UP中进行缓慢的滑动!
完整的代码和下载地址如下:
(https://github.com/GuoFeilong/ATDragViewDemo)