Android自定义ScrollBar android自定义View之垂直的滚动条

以前项目里面做过一个垂直的滚动条，拿过来改了改，做了一个垂直的滚动条，不多说，贴代码。

package com.my.example;

import com.my.example.R

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.drawable.Drawable;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

public class VerticalSeekBar extends View {

private final static String TAG = "VerticalSeekBar";

// 要画的图片

private Drawable mBackGroud;

private Drawable mThumb;

// 背景

private int m_nBackGroudWidth;

private int m_nBackGroudHeight;

// 滑块

private int m_nThumbHeight;

private int m_nThumbWidth;

// 滚动条高度,当滑块在最低端时，这时进度应该是0，所以滚动条高度应该是背景高度减去滑块高度

private int m_nSeekBarHeight;

private int m_nThumbLeft; // 滑块里父元素左边的距

private int m_nThumbTop; // 滑块离顶部距

private int m_nProgress; // 当前的进度

private int m_nMax=100; //最大值,一般从0开始

private OnVerticalSeekBarChangeListener mListener;

public interface OnVerticalSeekBarChangeListener{

void onProgressChanged(VerticalSeekBar verticalSeekBar, int progress);

}

public VerticalSeekBar(Context context, AttributeSet attrs) {

super(context, attrs);

mBackGroud = context.getResources().getDrawable(R.drawable.poker_seekbar_bg);

int intrinsicHeight = mBackGroud.getIntrinsicHeight();

int intrinsicWidth = mBackGroud.getIntrinsicWidth();

mThumb = context.getResources().getDrawable(R.drawable.poker_seekbar_bg);

// 物理像素，屏幕上显示的宽度和高度

m_nBackGroudWidth = (int) getResources().getDimension(R.dimen.vertical_seekbar_bg_width);

m_nBackGroudHeight = (int) getResources().getDimension(R.dimen.vertical_seekbar_bg_height);

m_nThumbWidth = (int) getResources().getDimension(R.dimen.vertical_seekbar_thumb_width);m_nThumbHeight = (int) getResources().getDimension(R.dimen.vertical_seekbar_thumb_height);Log.i(TAG, "m_nThumbWidth=" + m_nThumbWidth + ",m_nThumbHeight=" + m_nThumbHeight);m_nSeekBarHeight = m_nBackGroudHeight - m_nThumbHeight;m_nThumbLeft = (m_nBackGroudWidth - m_nThumbWidth) / 2;// 第一,二个参数是相对于父元素坐标，三四个是宽度和高度mBackGroud.setBounds(0, 0, m_nBackGroudWidth, m_nBackGroudHeight); } @Override protected void onDraw(Canvas canvas) {// getLeft相对于父元素左边距离,getRight=getLeft+getWidthint width = getWidth();Log.i(TAG, "width=" + width);mBackGroud.draw(canvas);mThumb.draw(canvas); } @Override public boolean onTouchEvent(MotionEvent event) {int Y = (int) event.getY();int progress = 0;// 这是滑块已经到达顶部if (Y <= m_nThumbHeight / 2) { progress = m_nMax;}// 滑块到达最底端else if (Y >= (m_nSeekBarHeight + m_nThumbHeight / 2)) { progress = 0;} else { progress = (m_nSeekBarHeight - Y + m_nThumbHeight / 2) * m_nMax / m_nSeekBarHeight;}refresh(progress);return true; } private void refresh(int progress) { m_nThumbTop = (m_nMax-progress )* m_nSeekBarHeight / m_nMax; // 把m_nSeekBarHeight分成m_nMax份，progress是当前的份额mThumb.setBounds(m_nThumbLeft, m_nThumbTop, m_nThumbLeft + m_nThumbWidth, m_nThumbTop + m_nThumbHeight);invalidate(); if(mListener!=null){ mListener.onProgressChanged(this, progress);} } public void setListener(OnVerticalSeekBarChangeListener a_Listen) {mListener = a_Listen; }public void setMax(int max) { this.m_nMax=max;refresh(0); } }