Android如何自定义view仿IOS开关效果
小编给大家分享一下Android如何自定义view仿IOS开关效果,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!
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功能点:
不滑出边界,超过一半自动切换(边界判断) 可滑动,也可点击(事件共存) 提供状态改变监听(设置回调) 通过属性设置初始状态、背景图片、滑动按钮(自定义属性)
自定义View的概述
Android 在绘制 View 时,其实就像蒙上眼睛在画板上画画,它并不知道应该把 View 画多大,画哪儿,怎么画。所以我们必须实现 View 的三个重要方法,以告诉它这些信息。即:onMeasure(画多大),onLayout(画哪儿),onDraw(怎么画)。
View的生命周期
在动手写之前,必须先了解以下几个概念:
1.View 的默认不支持 WRAP_CONTENT,必须重写 onMeasure 方法,通过 setMeasuredDimension() 设置尺寸2.基本的事件分发机制:onClickListener 一定是在 onTouchEvent 之后执行
自定义View的流程
开始动手
1.导入开关的样式文件
2.开始自定义view,重点在onDraw()
/** * Author:AND * Time:2018/3/20. * Email:2911743255@qq.com * Description: * Detail:仿IOS开关 */public class SwitchButton extends View { //画笔 private final Paint mPaint = new Paint(); private static final double MBTNHEIGHT = 0.55; private static final int OFFSET = 3; private int mHeight; private float mAnimate = 0L; //此处命名不规范,目的和Android自带的switch有相同的用法 private boolean checked = false; private float mScale; private int mSelectColor; private OnCheckedChangeListener mOnCheckedChangeListener; public SwitchButton(Context context) { this(context, null); } public SwitchButton(Context context, AttributeSet attrs) { super(context, attrs); TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SwitchButton); mSelectColor = typedArray.getColor(R.styleable.SwitchButton_buttonColor, Color.parseColor("#2eaa57")); typedArray.recycle(); } /** * @param widthMeasureSpec * @param heightMeasureSpec 高度是是宽度的0.55倍 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = MeasureSpec.getSize(widthMeasureSpec); mHeight = (int) (MBTNHEIGHT * width); setMeasuredDimension(width, mHeight); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mPaint.setStyle(Paint.Style.FILL); mPaint.setAntiAlias(true); mPaint.setColor(mSelectColor); Rect rect = new Rect(0, 0, getWidth(), getHeight()); RectF rectf = new RectF(rect); //绘制圆角矩形 canvas.drawRoundRect(rectf, mHeight / 2, mHeight / 2, mPaint); //以下save和restore很重要,确保动画在中间一层 ,如果大家不明白,可以去搜下用法 canvas.save(); mPaint.setColor(Color.parseColor("#E6E6E6")); mAnimate = mAnimate - 0.1f > 0 ? mAnimate - 0.1f : 0; // 动画标示 ,重绘10次,借鉴被人的动画 mScale = (!checked ? 1 - mAnimate : mAnimate); canvas.scale(mScale, mScale, getWidth() - getHeight() / 2, rect.centerY()); //绘制缩放的灰色圆角矩形 canvas.drawRoundRect(rectf, mHeight / 2, mHeight / 2, mPaint); mPaint.setColor(Color.WHITE); Rect rect_inner = new Rect(OFFSET, OFFSET, getWidth() - OFFSET, getHeight() - OFFSET); RectF rect_f_inner = new RectF(rect_inner); //绘制缩放的白色圆角矩形,和上边的重叠实现灰色边框效果 canvas.drawRoundRect(rect_f_inner, (mHeight - 8) / 2, (mHeight - 8) / 2, mPaint); canvas.restore(); //中间圆形平移 int sWidth = getWidth(); int bTranslateX = sWidth - getHeight(); final float translate = bTranslateX * (!checked ? mAnimate : 1 - mAnimate); canvas.translate(translate, 0); //以下两个圆带灰色边框 mPaint.setColor(Color.parseColor("#E6E6E6")); canvas.drawCircle(getHeight() / 2, getHeight() / 2, getHeight() / 2 - OFFSET / 2, mPaint); mPaint.setColor(Color.WHITE); canvas.drawCircle(getHeight() / 2, getHeight() / 2, getHeight() / 2 - OFFSET, mPaint); if (mScale > 0) { mPaint.reset(); invalidate(); } } /** * 事件分发 * * @param event * @return */ @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: return true; case MotionEvent.ACTION_MOVE: break; case MotionEvent.ACTION_UP: mAnimate = 1; checked = !checked; if (mOnCheckedChangeListener != null) { mOnCheckedChangeListener.OnCheckedChanged(checked); } invalidate(); break; } return super.onTouchEvent(event); } /** * 状态构造函数 * * @return */ public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } /** * 构造函数 * * @return */ public OnCheckedChangeListener getmOnCheckedChangeListener() { return mOnCheckedChangeListener; } /** * 调用方法 * * @param mOnCheckedChangeListener */ public void setmOnCheckedChangeListener(OnCheckedChangeListener mOnCheckedChangeListener) { this.mOnCheckedChangeListener = mOnCheckedChangeListener; } /** * 滑动接口 */ public interface OnCheckedChangeListener { void OnCheckedChanged(boolean isChecked); }}
3.Activity中使用
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mBtnSwitch = (SwitchButton) findViewById(R.id.switch_btn); mBtnSwitch.setmOnCheckedChangeListener(new SwitchButton.OnCheckedChangeListener() { @Override public void OnCheckedChanged(boolean isChecked) { Toast.makeText(MainActivity.this, "" + isChecked, Toast.LENGTH_SHORT).show(); } }); }
当然,也可以上来就给开关定义状态值
mBtnSwitch.setChecked(boolean);
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