自定义view实现一个游标效果（增强）

2024-05-27 20:38
文章标签 实现 自定义 效果 view 增强 游标

本文主要是介绍自定义view实现一个游标效果（增强），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

继上一篇：自定义view实现一个游标效果，在此基础上新增支持功能：

当手指点击某个时间域时，也可以触发游标滑动到当前点击选择的时间域。


下面贴代码：

package com.baicells.omcserver.view;import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;import com.baicells.omcserver.R;import java.util.ArrayList;public class CursorView extends View {private int width;private int height;private int radius;private int strokeWidth;private int curTextColor;private int inCurTextColor;private ArrayList<String> cursorText;private Paint borderPaint;private Paint innerBgPaint;private Paint textPaint;private int current;private float offsetX;private RectF currentRectF;private boolean isInCurrent;private GestureDetector mDetector;private OnItemSelectListener mListener;public CursorView(Context context) {super(context);}public CursorView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);mDetector = new GestureDetector(context, mGestureListener);borderPaint = new Paint();borderPaint.setAntiAlias(true);borderPaint.setStyle(Paint.Style.FILL.STROKE);innerBgPaint = new Paint();innerBgPaint.setAntiAlias(true);innerBgPaint.setStyle(Paint.Style.FILL_AND_STROKE);textPaint = new Paint();textPaint.setAntiAlias(true);TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CursorView);int indexCount = typedArray.getIndexCount();for (int i = 0; i < indexCount; i++) {int index = typedArray.getIndex(i);switch (index) {case R.styleable.CursorView_current_bg_color:innerBgPaint.setColor(typedArray.getColor(index, Color.GREEN));break;case R.styleable.CursorView_current_text_color:curTextColor = typedArray.getColor(index, Color.WHITE);break;case R.styleable.CursorView_incurrent_text_color:inCurTextColor = typedArray.getColor(index, Color.BLACK);break;case R.styleable.CursorView_stroke_color:borderPaint.setColor(typedArray.getColor(index, Color.RED));break;case R.styleable.CursorView_textsize:textPaint.setTextSize(typedArray.getDimensionPixelSize(index, 20));break;case R.styleable.CursorView_stroke_width:strokeWidth = typedArray.getDimensionPixelSize(index, 3);break;}}typedArray.recycle();borderPaint.setStrokeWidth(strokeWidth);setLayerType(LAYER_TYPE_SOFTWARE, null);}public CursorView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public void setOnItemSelectListener(OnItemSelectListener listener) {this.mListener = listener;}public void setCursorText(ArrayList<String> cursorText) {this.cursorText = cursorText;invalidate();}public void setCurrent(int current) {this.current = current;invalidate();}public int getCurrent() {return current;}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);int modeWidth = MeasureSpec.getMode(widthMeasureSpec);int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);int modeHeight = MeasureSpec.getMode(heightMeasureSpec);width = 300;height = 20;if (modeWidth == MeasureSpec.EXACTLY) {width = sizeWidth;}if (modeHeight == MeasureSpec.EXACTLY) {height = sizeHeight;}setMeasuredDimension(width, height);radius = height / 2;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//画整个大背景RectF rect = new RectF(strokeWidth / 2, strokeWidth / 2, width - strokeWidth / 2, height - strokeWidth / 2);canvas.drawRoundRect(rect, radius, radius, borderPaint);if (cursorText != null) {int size = cursorText.size();float everyWidth = width * 1.0f / size;//画当前选中时间维度的背景RectF currBgRectF = getCurrBgRectF(everyWidth);currentRectF = currBgRectF;canvas.drawRoundRect(currBgRectF, radius, radius, innerBgPaint);//循环画时间维度文本for (int i = 0; i < size; i++) {textPaint.setShader(null);String text = cursorText.get(i);Paint.FontMetricsInt metricsInt = textPaint.getFontMetricsInt();float textwidth = textPaint.measureText(text);float preblank = (everyWidth - textwidth) / 2.0f;float x = everyWidth * i + preblank;float y = (height - metricsInt.bottom + metricsInt.top) / 2.0f - metricsInt.top;if (currBgRectF.left >= x && currBgRectF.left <= x + textwidth) {float split = (currBgRectF.left - x) / textwidth;LinearGradient shader = new LinearGradient(x, 0, x + textwidth,0, new int[]{inCurTextColor, curTextColor}, new float[]{split, split + 0.01f}, Shader.TileMode.CLAMP);textPaint.setShader(shader);}if (currBgRectF.right >= x && currBgRectF.right <= x + textwidth) {float split = (currBgRectF.right - x) / textwidth;LinearGradient shader = new LinearGradient(x, 0, x + textwidth,0, new int[]{curTextColor, inCurTextColor}, new float[]{split, split + 0.01f}, Shader.TileMode.CLAMP);textPaint.setShader(shader);}if (currBgRectF.left < x && currBgRectF.right > x + textwidth) {textPaint.setColor(curTextColor);} else {textPaint.setColor(inCurTextColor);}canvas.drawText(text, x, y, textPaint);}}}private RectF getCurrBgRectF(float everyWidth) {float left = everyWidth * current + offsetX;float right = everyWidth * (current + 1) + offsetX;if (left < 0) {left = 0;right = everyWidth;}if (right > width) {left = width - everyWidth;right = width;}return new RectF(left, 0, right, height);}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {ViewParent parent = null;while (true) {if (parent != null && parent instanceof ViewPager) {break;}if (parent != null) {parent = parent.getParent();} else {parent = getParent();}}switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:case MotionEvent.ACTION_UP:parent.requestDisallowInterceptTouchEvent(true);break;default:parent.requestDisallowInterceptTouchEvent(false);break;}return super.dispatchTouchEvent(ev);}private float downX = 0;private float downY = 0;@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:downX = event.getX();downY = event.getY();isInCurrent = currentRectF.contains(downX, downY);break;case MotionEvent.ACTION_MOVE:if (isInCurrent) {offsetX = x - downX;invalidate();}break;case MotionEvent.ACTION_UP:if (isInCurrent) {final NextCurrent nextCurrent = computeScrollX(currentRectF.left);final float lastX = offsetX;ValueAnimator anim = ValueAnimator.ofFloat(0, nextCurrent.getX());anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {float value = (float) animation.getAnimatedValue();offsetX = lastX + value;invalidate();float fraction = animation.getAnimatedFraction();if (fraction == 1.0f) {current = nextCurrent.getIndex();offsetX = 0;if (mListener != null) {mListener.onItemSelect(nextCurrent.getIndex());}}}});anim.setDuration(100);anim.start();}break;}mDetector.onTouchEvent(event);return true;}private NextCurrent getNeedScroll(float pointX) {if (cursorText != null) {NextCurrent next = new NextCurrent();int size = cursorText.size();float everyWidth = width * 1.0f / size;int index = 0;for (int i = 0; i < size; i++) {if (pointX > everyWidth * i && pointX < everyWidth * (i + 1)) {index = i;break;}}next.setIndex(index);next.setX(everyWidth * index - currentRectF.left);return next;}return null;}private NextCurrent computeScrollX(float left) {NextCurrent next = new NextCurrent();int index = 0;if (cursorText != null) {int size = cursorText.size();float everyWidth = width * 1.0f / size;float min = everyWidth + 1;for (int i = 0; i < size; i++) {float abs = Math.abs(left - everyWidth * i);if (abs < min) {min = abs;index = i;}}if (everyWidth * index > left) {next.setX(min);} else {next.setX(-min);}next.setIndex(index);}return next;}private GestureDetector.SimpleOnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() {@Overridepublic boolean onSingleTapConfirmed(MotionEvent e) {if (!isInCurrent) {final NextCurrent needScroll = getNeedScroll(e.getX());ValueAnimator anim = ValueAnimator.ofFloat(0, needScroll.getX());anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {offsetX = (float) animation.getAnimatedValue();invalidate();float fraction = animation.getAnimatedFraction();if (fraction == 1.0f) {current = needScroll.getIndex();offsetX = 0;if (mListener != null) {mListener.onItemSelect(current);
}}}});anim.setDuration(300);anim.start();}return super.onSingleTapConfirmed(e);}};private class NextCurrent {private int index;private float x;public int getIndex() {return index;}public void setIndex(int index) {this.index = index;}public float getX() {return x;}public void setX(float x) {this.x = x;}}public interface OnItemSelectListener {void onItemSelect(int item);}
}



这篇关于自定义view实现一个游标效果（增强）的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！


http://www.chinasem.cn/article/1008539。

相关文章

C++中unordered_set哈希集合的实现

C++中unordered_set哈希集合的实现

《C++中unordered_set哈希集合的实现》std::unordered_set是C++标准库中的无序关联容器,基于哈希表实现,具有元素唯一性和无序性特点,本文就来详细的介绍一下unorder... 目录一、概述二、头文件与命名空间三、常用方法与示例1. 构造与析构2. 迭代器与遍历3. 容量相关4
阅读更多...
C++中悬垂引用(Dangling Reference) 的实现

C++中悬垂引用(Dangling Reference) 的实现

《C++中悬垂引用(DanglingReference)的实现》C++中的悬垂引用指引用绑定的对象被销毁后引用仍存在的情况,会导致访问无效内存,下面就来详细的介绍一下产生的原因以及如何避免,感兴趣... 目录悬垂引用的产生原因1. 引用绑定到局部变量，变量超出作用域后销毁2. 引用绑定到动态分配的对象，对象
阅读更多...
SpringBoot基于注解实现数据库字段回填的完整方案

SpringBoot基于注解实现数据库字段回填的完整方案

《SpringBoot基于注解实现数据库字段回填的完整方案》这篇文章主要为大家详细介绍了SpringBoot如何基于注解实现数据库字段回填的相关方法,文中的示例代码讲解详细,感兴趣的小伙伴可以了解... 目录数据库表pom.XMLRelationFieldRelationFieldMapping基础的一些代
阅读更多...
Java HashMap的底层实现原理深度解析

Java HashMap的底层实现原理深度解析

《JavaHashMap的底层实现原理深度解析》HashMap基于数组+链表+红黑树结构,通过哈希算法和扩容机制优化性能,负载因子与树化阈值平衡效率,是Java开发必备的高效数据结构,本文给大家介绍... 目录一、概述：HashMap的宏观结构二、核心数据结构解析1. 数组（桶数组）2. 链表节点（Node
阅读更多...
Java AOP面向切面编程的概念和实现方式

Java AOP面向切面编程的概念和实现方式

《JavaAOP面向切面编程的概念和实现方式》AOP是面向切面编程,通过动态代理将横切关注点（如日志、事务）与核心业务逻辑分离,提升代码复用性和可维护性,本文给大家介绍JavaAOP面向切面编程的概... 目录一、AOP 是什么？二、AOP 的核心概念与实现方式核心概念实现方式三、Spring AOP 的关
阅读更多...
Python实现字典转字符串的五种方法

Python实现字典转字符串的五种方法

《Python实现字典转字符串的五种方法》本文介绍了在Python中如何将字典数据结构转换为字符串格式的多种方法,首先可以通过内置的str()函数进行简单转换;其次利用ison.dumps()函数能够... 目录1、使用json模块的dumps方法：2、使用str方法：3、使用循环和字符串拼接：4、使用字符
阅读更多...
Linux下利用select实现串口数据读取过程

Linux下利用select实现串口数据读取过程

《Linux下利用select实现串口数据读取过程》文章介绍Linux中使用select、poll或epoll实现串口数据读取,通过I/O多路复用机制在数据到达时触发读取,避免持续轮询,示例代码展示设... 目录示例代码（使用select实现）代码解释总结在 linux 系统里，我们可以借助 select、
阅读更多...
Linux挂载linux/Windows共享目录实现方式

Linux挂载linux/Windows共享目录实现方式

《Linux挂载linux/Windows共享目录实现方式》：本文主要介绍Linux挂载linux/Windows共享目录实现方式,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地... 目录文件共享协议linux环境作为服务端（NFS）在服务器端安装 NFS创建要共享的目录修改 NFS 配
阅读更多...
通过React实现页面的无限滚动效果

通过React实现页面的无限滚动效果

《通过React实现页面的无限滚动效果》今天我们来聊聊无限滚动这个现代Web开发中不可或缺的技术,无论你是刷微博、逛知乎还是看脚本,无限滚动都已经渗透到我们日常的浏览体验中,那么,如何优雅地实现它呢？... 目录1. 早期的解决方案2. 交叉观察者：IntersectionObserver2.1 Inter
阅读更多...
Spring Gateway动态路由实现方案

Spring Gateway动态路由实现方案

《SpringGateway动态路由实现方案》本文主要介绍了SpringGateway动态路由实现方案,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随... 目录前沿何为路由RouteDefinitionRouteLocator工作流程动态路由实现尾巴前沿S
阅读更多...

Copyright China编程 23002807@qq.com

沪ICP备2023033072号-2