Android自定义简易时间选择器

首先，我们来看下这个时间选择器大概的样子



我们来仔细观察下这个布局，在选择日期的时候，我们可以看做是可以上下滑动的三个listview的横向组合，listview的内容则是年份，月份和日期。

然后这个选择器中可见的是3个item，中间显示的才是我们要选定的日期。

来看下功能，比如说现在我们要选择年份，当我们停止滑动年份的这个选择器的时候，选择器会停下来并且会把我们所想选择的年份居中显示。

好了，现在我们来开始写这个选择器的布局吧。

这个是我们的首页

<?xml version="1.0" encoding="utf-8"?>

接下来就是我们的日期选择器的界面啦！

<?xml version="1.0" encoding="utf-8"?>

我们可以看到这个时间选择器上的listview的可见的item是有三个，那么这样如何实现呢，我们可以把listview的高度设成固定值，其item的高度就设置成listview高度的1/3，就可以啦！不多说，上代码：

<?xml version="1.0" encoding="utf-8"?>

好啦，布局我们有了可以上代码了

首先是我们的日期选择器的代码，具体我在这不多说了，代码里有很详细的注解

package com.example.peiwc.myapplicationtime;

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

public class CustomDialog extends Dialog {
public CustomDialog(Context context, int theme) {
super(context, theme);
}

public static class Builder {
private int year;
private int month;
private int day;
int y;
private Context context;
private DialogInterface.OnClickListener positiveButtonClickListener;
private DialogInterface.OnClickListener negativeButtonClickListener;
private ArrayList year_list, mouth_list, day_list;
ListView lv1, lv2, lv3;

public Builder(Context context) {
this.context = context;
}

public Builder setPositiveButton(DialogInterface.OnClickListener listener) {
this.positiveButtonClickListener = listener;
return this;
}

public Builder setNegativeButton(DialogInterface.OnClickListener listener) {
this.negativeButtonClickListener = listener;
return this;
}

public CustomDialog create() {
//创建日期选择器界面
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final CustomDialog dialog = new CustomDialog(context, R.style.Dialog);
View layout = inflater.inflate(R.layout.time_dialog, null);
dialog.addContentView(layout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
if (positiveButtonClickListener != null) {
layout.findViewById(R.id.sure).setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
positiveButtonClickListener.onClick(dialog,
DialogInterface.BUTTON_POSITIVE);
}
});
}

if (negativeButtonClickListener != null) {
layout.findViewById(R.id.cancel)
.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
negativeButtonClickListener.onClick(dialog,
DialogInterface.BUTTON_NEGATIVE);
}
});
}
lv1 = (ListView) layout.findViewById(R.id.lv1);//年listview
lv2 = (ListView) layout.findViewById(R.id.lv2);//月listview
lv3 = (ListView) layout.findViewById(R.id.lv3);//日listview
initListViews();
dialog.setContentView(layout);
return dialog;
}

private void initListViews() {

Calendar calendar = Calendar.getInstance();
//获得当前的日期
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH) + 1;
day = calendar.get(Calendar.DAY_OF_MONTH);
y = year - 2000 + 1;//这个y是从2000年到当前年份2016年中间间隔的年数，17年，这个可以看需求自己定
year_list = new ArrayList();
mouth_list = new ArrayList();
day_list = new ArrayList();
getContent(year_list, mouth_list, day_list);
lv1.setAdapter(new MyAdapter( year_list));
lv1.setSelection(year_list.size() - 3);//默认年份现实的是今年的年份，因为年份list最后一位是“”，当前年份是倒数第二位，即lv1.setSelection(year_list.size() - 3)显示的是当前的年份
//给listview设置滚动监听，当滚动停止后让listview显示特定的一项
lv1.setOnScrollListener(new AbsListView.OnScrollListener() {

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://空闲状态
//获得当滑动结束后listview可见的第0个item的滚动距离
int a = 0 - lv1.getChildAt(0).getTop();
//获得listview的每个item的高度
int b = lv1.getMeasuredHeight() / 3;
float f = (float) a / b;
//如果滑动出屏幕的item的大小占item大小的比重在0到0.75之间的话，显示第一个可见的，就是说如果移动范围小的话显示的日期是不变的
if (f < 0.75) {
lv1.setSelection(lv1.getFirstVisiblePosition());
}
//如果滑动出屏幕的item的大小占item大小的比重在0。75到1之间的话，显示第二个可见的，就是说如果移动范围大的话显示的日期是要加一的
if (f > 0.75 && f < 1) {
lv1.setSelection(lv1.getFirstVisiblePosition() + 1);
}
}
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

}
});
//显示月份同上
lv2.setAdapter(new MyAdapter( mouth_list));
lv2.setSelection(calendar.get(Calendar.MONTH));
lv2.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://空闲状态

int a = 0 - lv2.getChildAt(0).getTop();
int b = lv2.getMeasuredHeight() / 3;
float f = (float) a / b;
if (f < 0.75) {
lv2.setSelection(lv2.getFirstVisiblePosition());
}
if (f > 0.75 && f < 1) {
lv2.setSelection(lv2.getFirstVisiblePosition() + 1);
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

}
});
//显示日期同上
lv3.setAdapter(new MyAdapter( day_list));
lv3.setSelection(day - 1);
lv3.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE://空闲状态

int a = 0 - lv3.getChildAt(0).getTop();
int b = lv3.getMeasuredHeight() / 3;
float f = (float) a / b;
if (f < 0.75) {
lv3.setSelection(lv3.getFirstVisiblePosition());
}
if (f > 0.75 && f < 1) {
lv3.setSelection(lv3.getFirstVisiblePosition() + 1);
}
}
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

}
});
}

/**
* 给选择器添加内容
*/
private void getContent(List year_list, List mouth_list, List day_list) {
//因为选择器是分3格，中间显示的数字才算是时间，拉到最上方和最下方的时候都要留白，所以要赋值的话list前后要填加“”，
//所以年份的list的长度是y+2,月份的长度是12+2=14，日期的话就是31+2=33。
String my;
for (int i = 0; i < y + 2; i++) {
if (i == 0 || i == y + 1) {
my = "";
} else {
int m = 2000 + i - 1;
my = String.valueOf(m);
}
year_list.add(i, my);
}
String mm;
for (int i = 0; i < 14; i++) {
if (i == 0 || i == 13) {
mm = "";
} else {
mm = i + "";
}
mouth_list.add(i, mm);
}
String md;
for (int i = 0; i < 33; i++) {
if (i == 0 || i == 32) {
md = "";
} else {
md = i + "";
}
day_list.add(i, md);
}
}

public String getStr() {
int year = lv1.getFirstVisiblePosition() + 2000;
int month = lv2.getFirstVisiblePosition() + 1;
int day = lv3.getFirstVisiblePosition() + 1;
String m = month < 10 ? "0" + String.valueOf(month) : String.valueOf(month);
String d = day < 10 ? "0" + String.valueOf(day) : String.valueOf(day);
return String.valueOf(year) + "-" + m + "-" + d;
}

private class MyAdapter extends BaseAdapter {
private ArrayList list;

public MyAdapter(ArrayList list) {
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = LayoutInflater.from(context).inflate(
R.layout.list_item, null);
TextView tv = (TextView) convertView.findViewById(R.id.tv);
tv.setText(list.get(position));
return convertView;
}
}

}

}

然后是activity的代码

package com.example.peiwc.myapplicationtime;

import android.app.Activity;
import android.app.Dialog;
import android.content.DialogInterface;

import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
private Button btn;
private TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.textView);
btn = (Button) findViewById(R.id.search_close_btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDialog();
}
});
}

private void showDialog() {
final CustomDialog.Builder builder = new CustomDialog.Builder(this);
builder.setPositiveButton(new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
tv.setText(builder.getStr());
dialog.dismiss();
}
});

builder.setNegativeButton(new android.content.DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
showDialog(builder);
}

private void showDialog(CustomDialog.Builder builder) {
Dialog dialog = builder.create();
Window dialogWindow = dialog.getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
dialogWindow.setGravity(Gravity.CENTER);
WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay(); // 获取屏幕宽、高用
WindowManager.LayoutParams p = dialogWindow.getAttributes(); // 获取对话框当前的参数值
p.width = (int) (d.getWidth() * 0.75); // 宽度设置为屏幕的0.65
dialogWindow.setAttributes(p);
dialog.show();
}
}

日期选择器就大功告成啦！

想下载完整demo，可以点击下方的链接哦！
http://download.csdn.net/detail/aa_chao/9622936