wheelview--->安卓滚轮控件

没有太多时间,直接上控件源码吧,直接从github上也可以找到,有很重量级的.包括三级联动的,全国省市,时间选择(貌似时间选择的用自带的 datepicker还是很不错的哦)

直接git clone https://github.com/wangjiegulu/WheelView

https://github.com/wangjiegulu/WheelView

package com.example.administrator.myapplication;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
* Author: wangjie
* Email: [e-mail]
* Date: 7/1/14.
*/
public class WheelView extends ScrollView {
public static final String TAG = WheelView.class.getSimpleName();

public static class OnWheelViewListener {    public void onSelected(int selectedIndex, String item) {    }}private Context context;

// private ScrollView scrollView;

private LinearLayout views;public WheelView(Context context) {    super(context);    init(context);}public WheelView(Context context, AttributeSet attrs) {    super(context, attrs);    init(context);}public WheelView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    init(context);}//    String[] items;List<String> items;private List<String> getItems() {    return items;}public void setItems(List<String> list) {    if (null == items) {        items = new ArrayList<String>();    }    items.clear();    items.addAll(list);    // 前面和后面补全    for (int i = 0; i < offset; i++) {        items.add(0, "");        items.add("");    }    initData();}public static final int OFF_SET_DEFAULT = 1;int offset = OFF_SET_DEFAULT; // 偏移量（需要在最前面和最后面补全）public int getOffset() {    return offset;}public void setOffset(int offset) {    this.offset = offset;}int displayItemCount; // 每页显示的数量int selectedIndex = 1;private void init(Context context) {    this.context = context;

// scrollView = ((ScrollView)this.getParent());
// Log.d(TAG, “scrollview: ” + scrollView);
Log.d(TAG, “parent: ” + this.getParent());
// this.setOrientation(VERTICAL);
this.setVerticalScrollBarEnabled(false);

    views = new LinearLayout(context);    views.setOrientation(LinearLayout.VERTICAL);    this.addView(views);    scrollerTask = new Runnable() {        public void run() {            int newY = getScrollY();            if (initialY - newY == 0) { // stopped                final int remainder = initialY % itemHeight;                final int divided = initialY / itemHeight;

// Log.d(TAG, “initialY: ” + initialY);
// Log.d(TAG, “remainder: ” + remainder + “, divided: ” + divided);
if (remainder == 0) {
selectedIndex = divided + offset;

                    onSeletedCallBack();                } else {                    if (remainder > itemHeight / 2) {                        WheelView.this.post(new Runnable() {                            @Override                            public void run() {                                WheelView.this.smoothScrollTo(0, initialY - remainder + itemHeight);                                selectedIndex = divided + offset + 1;                                onSeletedCallBack();                            }                        });                    } else {                        WheelView.this.post(new Runnable() {                            @Override                            public void run() {                                WheelView.this.smoothScrollTo(0, initialY - remainder);                                selectedIndex = divided + offset;                                onSeletedCallBack();                            }                        });                    }                }            } else {                initialY = getScrollY();                WheelView.this.postDelayed(scrollerTask, newCheck);            }        }    };}int initialY;Runnable scrollerTask;int newCheck = 50;public void startScrollerTask() {    initialY = getScrollY();    this.postDelayed(scrollerTask, newCheck);}private void initData() {    displayItemCount = offset * 2 + 1;    for (String item : items) {        views.addView(createView(item));    }    refreshItemView(0);}int itemHeight = 0;private TextView createView(String item) {    TextView tv = new TextView(context);    tv.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));    tv.setSingleLine(true);    tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);    tv.setText(item);    tv.setGravity(Gravity.CENTER);    int padding = dip2px(15);    tv.setPadding(padding, padding, padding, padding);    if (0 == itemHeight) {        itemHeight = getViewMeasuredHeight(tv);        Log.d(TAG, "itemHeight: " + itemHeight);        views.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight * displayItemCount));        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) this.getLayoutParams();        this.setLayoutParams(new LinearLayout.LayoutParams(lp.width, itemHeight * displayItemCount));    }    return tv;}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {    super.onScrollChanged(l, t, oldl, oldt);

// Log.d(TAG, “l: ” + l + “, t: ” + t + “, oldl: ” + oldl + “, oldt: ” + oldt);

// try {
// Field field = ScrollView.class.getDeclaredField(“mScroller”);
// field.setAccessible(true);
// OverScroller mScroller = (OverScroller) field.get(this);
//
//
// if(mScroller.isFinished()){
// Log.d(TAG, “isFinished…”);
// }
//
// } catch (Exception e) {
// e.printStackTrace();
// }

    refreshItemView(t);    if (t > oldt) {

// Log.d(TAG, “向下滚动”);
scrollDirection = SCROLL_DIRECTION_DOWN;
} else {
// Log.d(TAG, “向上滚动”);
scrollDirection = SCROLL_DIRECTION_UP;

    }}private void refreshItemView(int y) {    int position = y / itemHeight + offset;    int remainder = y % itemHeight;    int divided = y / itemHeight;    if (remainder == 0) {        position = divided + offset;    } else {        if (remainder > itemHeight / 2) {            position = divided + offset + 1;        }

// if(remainder > itemHeight / 2){
// if(scrollDirection == SCROLL_DIRECTION_DOWN){
// position = divided + offset;
// Log.d(TAG, “>down…position: ” + position);
// }else if(scrollDirection == SCROLL_DIRECTION_UP){
// position = divided + offset + 1;
// Log.d(TAG, “>up…position: ” + position);
// }
// }else{
//// position = y / itemHeight + offset;
// if(scrollDirection == SCROLL_DIRECTION_DOWN){
// position = divided + offset;
// Log.d(TAG, “