NumberPicker使用

设计原则：方法回调

最开始设计：完成了NumberPicker这个工程类的选择，当时忘记了把值传递给调用的Activtiy/Fragment，之后，将案例用于实际工程中，便无法取得当前的值，于是：傻了，然后想到回调，我目前知道的回调的方法就是通过Activtiy回调，但是，这里无法用Activtiy回调……

有幸得靖哥，写了当前的这种回调方式：不能理解深入，方案是：

1、让功能类内部有一个接口，接口里有一个处理数据的方法，设计构造方法的时，把功能类设计到构造方法里面

2、调用类实现功能类内部的接口，并且实现方法，（主要目的还是为了功能类能调用当前方法）

3、当Dialog点击确定的时候，将传递过来的功能类，调用自身方法，这里数据便回调给了Fragment（可能理解错误，）

再分析：回调是：功能类调用Fragment中的方法，处理数据

布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"     android:gravity="center_horizontal">    <NumberPicker        android:id="@+id/np_year"        android:layout_width="80dp"        android:layout_height="wrap_content"        android:focusable="true"        android:focusableInTouchMode="true"         android:layout_marginRight="10dp"/>        <NumberPicker        android:id="@+id/np_month"        android:layout_width="80dp"        android:layout_height="wrap_content"        android:focusable="true"        android:focusableInTouchMode="true"         android:layout_marginLeft="10dp"/></LinearLayout>

代码

package com.sysweal.marketing.bogy.support.utils;import java.util.Calendar;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.view.LayoutInflater;import android.view.View;import android.widget.NumberPicker;import android.widget.Toast;import android.widget.NumberPicker.OnValueChangeListener;import com.sysweal.marketing.bogy.R;public class DatePickerDialogUtil {<span style="white-space:pre"></span>private Context ct;<span style="white-space:pre"></span>private String title;<span style="white-space:pre"></span>private String yearValue;<span style="white-space:pre"></span>private String monthValue;<span style="white-space:pre"></span>private int monthTempMaxValue;<span style="white-space:pre"></span>private boolean flagDate = true;<span style="white-space:pre"></span>private String seasonValue;<span style="white-space:pre"></span>private boolean flagSeason = true;<span style="white-space:pre"></span>public String yearClick;<span style="white-space:pre"></span>public String monthClick;<span style="white-space:pre"></span>public String seasonClick;<span style="white-space:pre"></span>DatePickerCallback callback;<span style="white-space:pre"></span>public DatePickerDialogUtil(Context ct, String title,DatePickerCallback callback) {<span style="white-space:pre"></span>super();<span style="white-space:pre"></span>this.ct = ct;<span style="white-space:pre"></span>this.title = title;<span style="white-space:pre"></span>this.callback = callback;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public String[] getDate(){<span style="white-space:pre"></span>showDateDialog().show();<span style="white-space:pre"></span>String[] dateAry = new String[2];<span style="white-space:pre"></span>if(yearClick != null){<span style="white-space:pre"></span>dateAry[0] = yearClick;<span style="white-space:pre"></span>dateAry[1] = monthClick;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>return dateAry;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>/** 日期选择 **/<span style="white-space:pre"></span>public AlertDialog showDateDialog() {<span style="white-space:pre"></span>AlertDialog.Builder builder = new AlertDialog.Builder(ct);<span style="white-space:pre"></span>builder.setMessage(title);<span style="white-space:pre"></span>builder.setCancelable(false);<span style="white-space:pre"></span>builder.setView(dateView());<span style="white-space:pre"></span>builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {<span style="white-space:pre"></span>public void onClick(DialogInterface dialog, int id) {<span style="white-space:pre"></span>yearClick =( yearValue == null ? yearClick: yearValue);<span style="white-space:pre"></span>monthClick = ( monthValue == null ? monthClick: monthValue);<span style="white-space:pre"></span>//不点击，其实已经点击<span style="white-space:pre"></span>Calendar calendar = Calendar.getInstance();<span style="white-space:pre"></span>int yearValueCal = calendar.get(Calendar.YEAR);<span style="white-space:pre"></span>int monthValueCal = calendar.get(Calendar.MONTH) + 1;<span style="white-space:pre"></span>if(yearClick == null || yearClick.equals("")){<span style="white-space:pre"></span>yearClick = yearValueCal + "";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(monthClick == null || monthClick.equals("")){<span style="white-space:pre"></span>monthClick = monthValueCal + "";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(callback != null){<span style="white-space:pre"></span>if(Integer.valueOf(monthClick) < 10){<span style="white-space:pre"></span>monthClick = "0" + monthClick;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>callback.dealYM(yearClick,monthClick);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>//Toast.makeText(ct, yearClick+":"+monthClick, 1).show();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {<span style="white-space:pre"></span>public void onClick(DialogInterface dialog, int id) {<span style="white-space:pre"></span>dialog.cancel();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>AlertDialog alert = builder.create();<span style="white-space:pre"></span>return alert;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public interface DatePickerCallback{<span style="white-space:pre"></span>public void dealYM(String year,String month);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>/** 季度选择 **/<span style="white-space:pre"></span>public AlertDialog showSeasonDialog() {<span style="white-space:pre"></span>AlertDialog.Builder builder = new AlertDialog.Builder(ct);<span style="white-space:pre"></span>builder.setMessage(title);<span style="white-space:pre"></span>builder.setCancelable(false);<span style="white-space:pre"></span>builder.setView(seasonView());<span style="white-space:pre"></span>builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {<span style="white-space:pre"></span>public void onClick(DialogInterface dialog, int id) {<span style="white-space:pre"></span>yearClick = (yearValue == null ? yearClick : yearValue);<span style="white-space:pre"></span>seasonClick = (seasonValue == null ? seasonClick : seasonValue);<span style="white-space:pre"></span>//不点击滚动，其实默认选择了<span style="white-space:pre"></span>if(yearClick == null || yearClick.equals("")){<span style="white-space:pre"></span>Calendar calendar = Calendar.getInstance();<span style="white-space:pre"></span>int yearValueCal = calendar.get(Calendar.YEAR);<span style="white-space:pre"></span>yearClick = yearValueCal + "";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(seasonClick == null || seasonClick.equals("")){<span style="white-space:pre"></span>Calendar calendar = Calendar.getInstance();<span style="white-space:pre"></span>int monthValueCal = calendar.get(Calendar.MONTH) + 1;<span style="white-space:pre"></span>int seasonDefaultValue = 0;<span style="white-space:pre"></span>if(monthValueCal <= 3){<span style="white-space:pre"></span>seasonDefaultValue = 0;<span style="white-space:pre"></span>}else if(3<monthValueCal && monthValueCal <= 6){<span style="white-space:pre"></span>seasonDefaultValue = 1;<span style="white-space:pre"></span>}else if(6<monthValueCal && monthValueCal <= 9){<span style="white-space:pre"></span>seasonDefaultValue = 2;<span style="white-space:pre"></span>}else if(9<monthValueCal){<span style="white-space:pre"></span>seasonDefaultValue = 3;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>seasonClick = seasonDefaultValue + "";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(callback != null){<span style="white-space:pre"></span>callback.dealYM(yearClick,seasonClick);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {<span style="white-space:pre"></span>public void onClick(DialogInterface dialog, int id) {<span style="white-space:pre"></span>dialog.cancel();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>AlertDialog alert = builder.create();<span style="white-space:pre"></span>return alert;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>/**<span style="white-space:pre"></span> * 创造一个日期选择的view<span style="white-space:pre"></span> */<span style="white-space:pre"></span>public View dateView() {<span style="white-space:pre"></span>Calendar calendar = Calendar.getInstance();<span style="white-space:pre"></span>final int yearValueCal = calendar.get(Calendar.YEAR);<span style="white-space:pre"></span>final int monthValueCal = calendar.get(Calendar.MONTH) + 1;<span style="white-space:pre"></span>View view = LayoutInflater.from(ct).inflate(R.layout.dateselectdialog,null);<span style="white-space:pre"></span><span style="white-space:pre"></span>final NumberPicker yearPicker = (NumberPicker) view.findViewById(R.id.np_year);<span style="white-space:pre"></span>final NumberPicker monthPicker = (NumberPicker) view.findViewById(R.id.np_month);<span style="white-space:pre"></span><span style="white-space:pre"></span>yearPicker.setMinValue(yearValueCal - 20);<span style="white-space:pre"></span>yearPicker.setMaxValue(yearValueCal);<span style="white-space:pre"></span>yearPicker.setValue(yearValueCal);<span style="white-space:pre"></span>yearPicker.setWrapSelectorWheel(false);<span style="white-space:pre"></span><span style="white-space:pre"></span>yearPicker.setOnValueChangedListener(new OnValueChangeListener() {<span style="white-space:pre"></span>@Override<span style="white-space:pre"></span>public void onValueChange(NumberPicker picker, int oldVal, int newVal) {<span style="white-space:pre"></span>yearValue = newVal+"";<span style="white-space:pre"></span><span style="white-space:pre"></span>/**<span style="white-space:pre"></span> * 对后面的月做处理<span style="white-space:pre"></span> */<span style="white-space:pre"></span>if(yearValue != null){<span style="white-space:pre"></span>flagDate = false;<span style="white-space:pre"></span>monthPicker.setMinValue(1);<span style="white-space:pre"></span>if(yearValueCal > Integer.valueOf(yearValue)){<span style="white-space:pre"></span>monthTempMaxValue = 12;<span style="white-space:pre"></span>}else{<span style="white-space:pre"></span>monthTempMaxValue = monthValueCal;<span style="white-space:pre"></span>if(monthValue != null){<span style="white-space:pre"></span>if(Integer.valueOf(monthValue) > monthValueCal ){<span style="white-space:pre"></span>monthValue = monthValueCal+"";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>monthPicker.setMaxValue(monthTempMaxValue);<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>//------------------------------------------------------------------------------------<span style="white-space:pre"></span>//默认<span style="white-space:pre"></span>if(flagDate){<span style="white-space:pre"></span>monthPicker.setMinValue(1);<span style="white-space:pre"></span>monthPicker.setMaxValue(monthValueCal);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>monthPicker.setValue(monthValueCal);<span style="white-space:pre"></span>monthPicker.setWrapSelectorWheel(true);<span style="white-space:pre"></span>monthPicker.setOnValueChangedListener(new OnValueChangeListener() {<span style="white-space:pre"></span>@Override<span style="white-space:pre"></span>public void onValueChange(NumberPicker picker, int oldVal, int newVal) {<span style="white-space:pre"></span>monthValue = newVal+"";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span><span style="white-space:pre"></span>return view;<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>/**<span style="white-space:pre"></span> * 创造一个季度选择的view<span style="white-space:pre"></span> * 季度选择输出值为：0，1，2，3，代表四个季度<span style="white-space:pre"></span> */<span style="white-space:pre"></span>public View seasonView() {<span style="white-space:pre"></span>Calendar calendar = Calendar.getInstance();<span style="white-space:pre"></span>final int yearValueCal = calendar.get(Calendar.YEAR);<span style="white-space:pre"></span>final int monthValueCal = calendar.get(Calendar.MONTH) + 1;<span style="white-space:pre"></span>View view = LayoutInflater.from(ct).inflate(R.layout.dateselectdialog,null);<span style="white-space:pre"></span><span style="white-space:pre"></span>final NumberPicker yearPicker = (NumberPicker) view.findViewById(R.id.np_year);<span style="white-space:pre"></span>final NumberPicker seasonPicker = (NumberPicker) view.findViewById(R.id.np_month);<span style="white-space:pre"></span><span style="white-space:pre"></span>yearPicker.setMinValue(yearValueCal - 20);<span style="white-space:pre"></span>yearPicker.setMaxValue(yearValueCal);<span style="white-space:pre"></span>yearPicker.setValue(yearValueCal);<span style="white-space:pre"></span>yearPicker.setWrapSelectorWheel(false);<span style="white-space:pre"></span><span style="white-space:pre"></span>yearPicker.setOnValueChangedListener(new OnValueChangeListener() {<span style="white-space:pre"></span>@Override<span style="white-space:pre"></span>public void onValueChange(NumberPicker picker, int oldVal, int newVal) {<span style="white-space:pre"></span>yearValue = newVal+"";<span style="white-space:pre"></span><span style="white-space:pre"></span>/**<span style="white-space:pre"></span> * 对后面的季度做处理<span style="white-space:pre"></span> */<span style="white-space:pre"></span>if(yearValue != null){<span style="white-space:pre"></span>flagSeason = false;<span style="white-space:pre"></span><span style="white-space:pre"></span>seasonPicker.setMinValue(0);<span style="white-space:pre"></span>if(yearValueCal > Integer.valueOf(yearValue)){<span style="white-space:pre"></span>String[] seasonAry = {"一季度","二季度","三季度","四季度"};<span style="white-space:pre"></span>seasonPicker.setDisplayedValues(seasonAry);<span style="white-space:pre"></span>seasonPicker.setMaxValue(seasonAry.length - 1);<span style="white-space:pre"></span>}else{<span style="white-space:pre"></span>int seasonDefaultValue = 0;<span style="white-space:pre"></span>if(monthValueCal <= 3){<span style="white-space:pre"></span>seasonDefaultValue = 0;<span style="white-space:pre"></span>}else if(3<monthValueCal && monthValueCal <= 6){<span style="white-space:pre"></span>seasonDefaultValue = 1;<span style="white-space:pre"></span>}else if(6<monthValueCal && monthValueCal <= 9){<span style="white-space:pre"></span>seasonDefaultValue = 2;<span style="white-space:pre"></span>}else if(9<monthValueCal){<span style="white-space:pre"></span>seasonDefaultValue = 3;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>String[] seasonAry2 = new String[seasonDefaultValue+1];<span style="white-space:pre"></span>for (int i = 0; i < seasonAry2.length; i++) {<span style="white-space:pre"></span>String temp = "";<span style="white-space:pre"></span>switch (i) {<span style="white-space:pre"></span>case 0 : temp = "一" ;break;<span style="white-space:pre"></span>case 1 : temp = "二" ;break;<span style="white-space:pre"></span>case 2 : temp = "三" ;break;<span style="white-space:pre"></span>case 3 : temp = "四" ;break;<span style="white-space:pre"></span>default : temp = "一" ;break;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>seasonAry2[i] = temp+"季度";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if(seasonValue != null){<span style="white-space:pre"></span>if(Integer.valueOf(seasonValue) > seasonDefaultValue){<span style="white-space:pre"></span>seasonValue = seasonDefaultValue +"";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>seasonPicker.setMaxValue(seasonAry2.length-1);<span style="white-space:pre"></span>seasonPicker.setDisplayedValues(seasonAry2);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span>//------------------------------------------------------------------------------------<span style="white-space:pre"></span>//默认<span style="white-space:pre"></span>int seasonDefaultValue = 0;<span style="white-space:pre"></span>if(monthValueCal <= 3){<span style="white-space:pre"></span>seasonDefaultValue = 0;<span style="white-space:pre"></span>}else if(3<monthValueCal && monthValueCal <= 6){<span style="white-space:pre"></span>seasonDefaultValue = 1;<span style="white-space:pre"></span>}else if(6<monthValueCal && monthValueCal <= 9){<span style="white-space:pre"></span>seasonDefaultValue = 2;<span style="white-space:pre"></span>}else if(9<monthValueCal){<span style="white-space:pre"></span>seasonDefaultValue = 3;<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>if(flagSeason){<span style="white-space:pre"></span>seasonPicker.setMinValue(0);<span style="white-space:pre"></span>String[] seasonAry = new String[seasonDefaultValue+1];<span style="white-space:pre"></span>for (int i = 0; i < seasonAry.length; i++) {<span style="white-space:pre"></span>String temp = "";<span style="white-space:pre"></span>switch (i) {<span style="white-space:pre"></span>case 0 : temp = "一" ;break;<span style="white-space:pre"></span>case 1 : temp = "二" ;break;<span style="white-space:pre"></span>case 2 : temp = "三" ;break;<span style="white-space:pre"></span>case 3 : temp = "四" ;break;<span style="white-space:pre"></span>default : temp = "一" ;break;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>seasonAry[i] = temp+"季度";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>seasonPicker.setMaxValue(seasonAry.length-1);<span style="white-space:pre"></span>seasonPicker.setDisplayedValues(seasonAry);<span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>seasonPicker.setValue(seasonDefaultValue);<span style="white-space:pre"></span>seasonPicker.setWrapSelectorWheel(false);<span style="white-space:pre"></span>seasonPicker.setOnValueChangedListener(new OnValueChangeListener() {<span style="white-space:pre"></span>@Override<span style="white-space:pre"></span>public void onValueChange(NumberPicker picker, int oldVal, int newVal) {<span style="white-space:pre"></span>seasonValue = newVal+"";<span style="white-space:pre"></span>}<span style="white-space:pre"></span>});<span style="white-space:pre"></span><span style="white-space:pre"></span>return view;<span style="white-space:pre"></span>}}