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小编给大家分享一下Android中如何实现ios滑动按钮的方法,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
IOS的滑动按钮菜单在UI设计里面绝对堪称一绝,在学习了Android的自定义view后,我萌生了模仿它的想法。
实现上面的模拟需要自定义一个View;
1)、在View的OnDraw里画出圆角矩形,分别为灰色圆角矩形,红色圆角矩形,和绿色圆角矩形。然后计算相应的位置。
2)、本例中的宽高比为1:0.65,内部红色矩形尺寸为外部矩形尺寸0.9,内部的圆的半径为外部高的0.45倍。按照这个比例计算相应的坐标。
3)、本例中的动画是用ValueAnimation实现的,具体实现在下部代码中。
4)、本例中的透明度实现方法和运动动画一样。
5)、自定义View为外部提供了读取和修改内部状态的接口。
具体代码如下,
1、界面的XML代码:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_switch_button" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.app_switchbutton.SwitchButtonActivity"> <com.example.app_switchbutton.switchbutton android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentStart="true" /> <com.example.app_switchbutton.switchbutton android:layout_width="100dp" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_alignParentBottom="true"/> </RelativeLayout>
2、实现自定义view的java代码:
package com.example.app_switchbutton; import android.animation.ValueAnimator; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.widget.RadioButton; /** * Created by 尽途 on 2017/4/26. */ public class switchbutton extends View { private int widthSize; private int heightSize; private boolean isOn=false; private float WhiteRoundRect_width,WhiteRoundRect_height; private float Circle_X,Circle_Y,WhiteRoundRect_X,WhiteRoundRect_Y; private float Radius; private float currentValue; private int currentAlphaofGreen,currentAlphaofGray; public switchbutton(Context context){ super(context); } public switchbutton(Context context, AttributeSet attributeSet){ super(context,attributeSet); setLayerType(LAYER_TYPE_SOFTWARE,null); initData(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { widthSize=MeasureSpec.getSize(widthMeasureSpec); heightSize=(int)(widthSize*0.65f); setMeasuredDimension(widthSize,heightSize); initData(); } void initData(){ if (isOn){ currentValue=widthSize-0.5f*heightSize; currentAlphaofGreen=255; currentAlphaofGray=0; } else { currentValue=0.5f*heightSize; currentAlphaofGreen=0; currentAlphaofGray=255; } } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (isOn){ DrawBackGreenRoundRect(canvas); DrawCircle(canvas); } else { DrawBackGrayRoundRect(canvas); DrawBackWhiteRoundRect(canvas); DrawCircle(canvas); } } private void DrawBackGrayRoundRect(Canvas canvas){ Paint paint0=new Paint(); paint0.setStyle(Paint.Style.FILL); paint0.setColor(Color.GRAY); paint0.setAntiAlias(true); paint0.setAlpha(currentAlphaofGray); RectF roundRect=new RectF(0,0,widthSize,heightSize); canvas.drawRoundRect(roundRect,heightSize*0.5f,heightSize*0.5f,paint0); } private void DrawBackGreenRoundRect(Canvas canvas){ Paint paint1=new Paint(); paint1.setStyle(Paint.Style.FILL); paint1.setColor(Color.GREEN); paint1.setAntiAlias(true); paint1.setAlpha(currentAlphaofGreen); RectF roundRect=new RectF(0,0,widthSize,heightSize); canvas.drawRoundRect(roundRect,heightSize*0.5f,heightSize*0.5f,paint1); } private void DrawCircle(Canvas canvas){ Circle_Y=heightSize*0.5f; Radius=heightSize*0.45f; Paint paint2=new Paint(); paint2.setStyle(Paint.Style.FILL); paint2.setColor(Color.WHITE); paint2.setAntiAlias(true); canvas.drawCircle(currentValue,Circle_Y,Radius,paint2); } private void DrawBackWhiteRoundRect(Canvas canvas){ Paint paint3=new Paint(); paint3.setStyle(Paint.Style.FILL); paint3.setColor(Color.RED); paint3.setAntiAlias(true); paint3.setAlpha(currentAlphaofGray); WhiteRoundRect_X=heightSize*0.05f; WhiteRoundRect_Y=heightSize*0.05f; WhiteRoundRect_width=widthSize-0.05f*heightSize; WhiteRoundRect_height=heightSize*0.95f; RectF rectf=new RectF(WhiteRoundRect_X,WhiteRoundRect_Y,WhiteRoundRect_width,WhiteRoundRect_height); canvas.drawRoundRect(rectf,WhiteRoundRect_height*0.5f,WhiteRoundRect_height*0.5f,paint3); } /** * 添加了过渡值动画,实现了平缓运动 * @param startValue * @param endValue */ private void setAnimation(float startValue,float endValue){ ValueAnimator valueAnimator=ValueAnimator.ofFloat(startValue,endValue); valueAnimator.setDuration(1500); valueAnimator.setTarget(currentValue); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { currentValue=(float)animation.getAnimatedValue(); invalidate(); } }); valueAnimator.start(); } private void setAlphaAnimationofGray(int startValue,int endValue){ ValueAnimator valueAnimator=ValueAnimator.ofInt(startValue,endValue); valueAnimator.setDuration(1500); valueAnimator.setTarget(currentAlphaofGray); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { currentAlphaofGray=(int)animation.getAnimatedValue(); invalidate(); } }); valueAnimator.start(); } private void setAlphaAnimationofGreen(int startValue,int endValue){ ValueAnimator valueAnimator=ValueAnimator.ofInt(startValue,endValue); valueAnimator.setDuration(1500); valueAnimator.setTarget(currentAlphaofGreen); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { currentAlphaofGreen=(int)animation.getAnimatedValue(); invalidate(); } }); valueAnimator.start(); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: return true; case MotionEvent.ACTION_MOVE: return false; case MotionEvent.ACTION_UP: isOn=!isOn; invalidate(); break; default: break; } if (isOn){ float startCircle_X=0.5f*heightSize; float endCircle_X=widthSize-0.5f*heightSize; setAnimation(startCircle_X,endCircle_X); setAlphaAnimationofGray(255,0); setAlphaAnimationofGreen(0,255); }else { float startCircle_X=widthSize-0.5f*heightSize; float endCircle_X=heightSize*0.5f; setAnimation(startCircle_X,endCircle_X); setAlphaAnimationofGray(0,255); setAlphaAnimationofGreen(255,0); } return super.onTouchEvent(event); } public void writeSwitchButtonState(boolean isOn){ this.isOn=isOn; } public boolean readSwitchButtonState(){ return isOn; } }
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