2015年的Android案例之旅
案例八：签到日历
知识点：
GridView的使用SQLite的使用
涉及文件：
res->layout->activity_main.xml 主布局文件res->layout->date.xml 布局文件src->db->DBHelper.java java文件src->db->SignDAO.java java文件src->activity->MainActivity.java java文件
activity_main.xml
01.
<!-- 线性布局 -->
02.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
03.
android:layout_height="match_parent"
04.
android:layout_width="match_parent"
05.
android:orientation="vertical">
06.
<!-- 文本控件
07.
显示当前月份 -->
08.
<TextView
09.
android:id="@+id/show"
10.
android:gravity="center"
11.
android:layout_width="match_parent"
12.
android:layout_height="wrap_content"
13.
android:text="月份"/>
14.
<!-- 网格视图
15.
-->
16.
<GridView
17.
android:id="@+id/myDate"
18.
android:layout_width="match_parent"
19.
android:layout_height="355dp"
20.
android:numColumns="7"></GridView>
21.
<Button
22.
android:id="@+id/sign"
23.
android:layout_width="match_parent"
24.
android:layout_height="wrap_content"
25.
android:text="签到"/>
26.
</LinearLayout>
date.xml
01.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
02.
android:layout_width="match_parent"
03.
android:layout_height="match_parent"
04.
android:orientation="vertical">
05.
06.
<TextView
07.
android:id="@+id/txtWeekDateMB"
08.
android:layout_width="wrap_content"
09.
android:layout_height="wrap_content"
10.
android:layout_marginLeft="10dp"
11.
android:layout_marginTop="10dp"
12.
android:visibility="gone" />
13.
14.
<TextView
15.
android:id="@+id/txtDayDateMB"
16.
android:layout_width="wrap_content"
17.
android:layout_height="wrap_content"
18.
android:layout_marginLeft="10dp"
19.
android:layout_marginTop="10dp" />
20.
</LinearLayout>
MainActivity.java
001.
public class MainActivity extends Activity {
002.
//Log标签
003.
private static final String TAG = "SIGN";
004.
//声明对象
005.
private Button sign;
006.
private TextView show;
007.
private GridView myDate;
008.
//获取本地时间
009.
Time nowTime = new Time();
010.
//一个月内的天数
011.
private int dayMaxNum;
012.
private int year,month,day,ym;
013.
private SignDAO sdao;
014.
//查询结果
015.
private List<String> list = new ArrayList<String>();
016.
private ArrayList<HashMap<String, Object>> sinalist,alisttmp;
017.
@SuppressLint("NewApi")
018.
@Override
019.
protected void onCreate(Bundle savedInstanceState) {
020.
super.onCreate(savedInstanceState);
021.
setContentView(R.layout.activity_main);
022.
Log.i(TAG, "SIGN is onCreate");
023.
024.
//初始化对象
025.
init();
026.
//初始化数据库信息
027.
initdata();
028.
029.
myDate.setOnItemClickListener(new OnItemClickListener(){
030.
031.
@Override
032.
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
033.
long arg3) {
034.
//判断是否已经签到 从服务器获取签到信息
035.
//模拟从本地数据库获取信息
036.
if(day==arg2+1)//只能当天签到
037.
{
038.
sinalist = sdao.findSinInfo("zhangsan",year+"-"+month+"-"+(arg2+1),"0");
039.
if(sinalist.size()>0)
040.
{
041.
Toast.makeText(getApplicationContext(), "已经签过到不能重复签到", 200).show();
042.
Log.d("", "已签到");
043.
}
044.
else
045.
{
046.
//在数据库插入一条数据
047.
sdao.insertSinInfo("zhangsan", "张三", year+"-"+month+"-"+(arg2+1),year+""+month);
048.
initdata();
049.
}
050.
}
051.
052.
}
053.
});
054.
}
055.
056.
/**
057.
* @param 初始化对象
058.
*/
059.
private void init(){
060.
sign = (Button)this.findViewById(R.id.sign);
061.
show = (TextView)this.findViewById(R.id.show);
062.
myDate = (GridView)this.findViewById(R.id.myDate);
063.
//取本地时间（时间应该从服务器获取）
064.
nowTime.setToNow();
065.
year = nowTime.year;
066.
month = nowTime.month+1;
067.
day = nowTime.monthDay;
068.
show.setText(year+"-"+month+"-"+day);
069.
}
070.
071.
/**
072.
* @param 初始化数据库信息
073.
*/
074.
private void initdata(){
075.
sdao = new SignDAO(MainActivity.this);
076.
sdao.open();
077.
sinalist = sdao.findSinInfo("zhangsan","",year+""+month);//查询当月已签到的日期
078.
list.clear();
079.
dayMaxNum = getCurrentMonthDay();
080.
for(int i=0;i<dayMaxNum;i++)
081.
{
082.
list.add(i, i+1+"");
083.
}
084.
myDate.setSelector(new ColorDrawable(Color.TRANSPARENT));
085.
myDate.setAdapter(new getDayNumAdapter(getApplicationContext()));
086.
}
087.
088.
class getDayNumAdapter extends BaseAdapter{
089.
090.
Context c;
091.
public getDayNumAdapter(Context c)
092.
{
093.
this.c = c;
094.
}
095.
096.
@Override
097.
public int getCount() {
098.
return list.size();
099.
}
100.
101.
@Override
102.
public Object getItem(int position) {
103.
return list.get(position);
104.
}
105.
106.
@Override
107.
public long getItemId(int arg0) {
108.
return 0;
109.
}
110.
111.
@Override
112.
public View getView(int position, View convertView, ViewGroup parent) {
113.
View v = LinearLayout.inflate(c, R.layout.date, null);
114.
TextView txtWeek = (TextView)v.findViewById(R.id.txtWeekDateMB);
115.
TextView txtDay = (TextView)v.findViewById(R.id.txtDayDateMB);
116.
switch (position)
117.
{
118.
case 0:
119.
txtWeek.setText("一");
120.
break;
121.
case 1:
122.
txtWeek.setText("二");
123.
break;
124.
case 2:
125.
txtWeek.setText("三");
126.
break;
127.
case 3:
128.
txtWeek.setText("四");
129.
break;
130.
case 4:
131.
txtWeek.setText("五");
132.
break;
133.
case 5:
134.
txtWeek.setText("六");
135.
break;
136.
case 6:
137.
txtWeek.setText("日");
138.
break;
139.
}
140.
if(position<7)
141.
{
142.
txtWeek.setVisibility(View.VISIBLE);
143.
}
144.
int lstDay = Integer.parseInt(list.get(position));
145.
//标记当前日期
146.
if(day==lstDay)
147.
{
148.
txtDay.setText(list.get(position).toString());
149.
txtDay.setTextColor(Color.RED);
150.
}else
151.
txtDay.setText(list.get(position).toString());
152.
//标记已签到后的背景
153.
for(int i=0;i<sinalist.size();i++)
154.
{
155.
String nowdate = sinalist.get(i).get("sindate").toString();
156.
String[] nowdatearr = nowdate.split("-");
157.
if(lstDay==Integer.parseInt(nowdatearr[2])){
158.
txtDay.setBackgroundColor(Color.BLUE);
159.
++ym;
160.
}
161.
sign.setText("已经签到天数:"+ym);
162.
}
163.
return v;
164.
}
165.
166.
}
167.
168.
169.
//获取当月的 天数
170.
public int getCurrentMonthDay() {
171.
Calendar a = Calendar.getInstance();
172.
a.set(Calendar.DATE, 1);
173.
a.roll(Calendar.DATE, -1);
174.
int maxDate = a.get(Calendar.DATE);
175.
return maxDate;
176.
}
177.
178.
179.
180.
181.
}
DBHelper.java
01.
public class DBHelper extends SQLiteOpenHelper {
02.
03.
public DBHelper(Context context) {
04.
super(context, "sign.db", null, 1);
05.
}
06.
07.
/**
08.
* @param 创建表
09.
*/
10.
@Override
11.
public void onCreate(SQLiteDatabase db) {
12.
String sql="create table sinTB(" +
13.
"sin_id integer primary key autoincrement," +
14.
"userid varchar(20)," +
15.
"usernmae varchar(20)," +
16.
"sindate varchar(20)," +
17.
"yearmonth varchar(20)," +
18.
"nowdate integer" +
19.
")";
20.
db.execSQL(sql);
21.
}
22.
23.
/**
24.
* @param 数据库版本更新时，会调用此方法
25.
*/
26.
@Override
27.
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
28.
29.
}
30.
31.
}
SignDAO.java
01.
public class SignDAO {
02.
//声明对象
03.
Context context;
04.
SQLiteDatabase db;
05.
DBHelper dbHelper;
06.
07.
public SignDAO(Context context){
08.
this.context = context;
09.
}
10.
11.
/**
12.
* @param 打开数据库连接
13.
*/
14.
public boolean open(){
15.
dbHelper = new DBHelper(context);
16.
db = dbHelper.getWritableDatabase();
17.
if(db == null){
18.
return false;
19.
}
20.
return true;
21.
}
22.
23.
/**
24.
* @param 关闭连接
25.
*/
26.
public void close(){
27.
dbHelper.close();
28.
}
29.
30.
/**
31.
* @param 插入信息
32.
* @param uid
33.
* @param name
34.
* @param date
35.
* @param ym
36.
*/
37.
public void insertSinInfo(String uid,String name,String date,String month){
38.
String sql="insert into sinTB(userid,usernmae,sindate,yearmonth,nowdate) values(?,?,?,?,?)";
39.
db.execSQL(sql,new Object[]{uid,name,date,month,System.currentTimeMillis()});
40.
}
41.
42.
/**
43.
* @param 查询信息
44.
* @param uid
45.
* @param date
46.
* @param ym
47.
* @return
48.
*/
49.
public ArrayList<HashMap<String, Object>> findSinInfo(String uid,String date,String month){
50.
ArrayList<HashMap<String,Object>> alist = new ArrayList<HashMap<String,Object>>();
51.
alist.clear();
52.
HashMap<String, Object> rowMap;
53.
String sql;
54.
try{
55.
if("0".equals(month))
56.
{
57.
sql="select * from sinTB where userid='"+uid+"' and sindate='"+date+"'";
58.
}
59.
else
60.
{
61.
sql="select * from sinTB where userid='"+uid+"' and yearmonth='"+month+"'";
62.
}
63.
Cursor cur = db.rawQuery(sql, null);
64.
cur.moveToFirst();
65.
while(cur.moveToNext()){
66.
rowMap = new HashMap<String, Object>();
67.
rowMap.put("sin_id", cur.getInt(cur.getColumnIndex("sin_id")));
68.
rowMap.put("userid", cur.getString(cur.getColumnIndex("userid")));
69.
rowMap.put("usernmae", cur.getString(cur.getColumnIndex("usernmae")));
70.
rowMap.put("sindate", cur.getString(cur.getColumnIndex("sindate")));
71.
long aa = cur.getLong(cur.getColumnIndex("nowdate"));
72.
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
73.
Date now = new Date(aa);
74.
String date1 = format.format(now);
75.
rowMap.put("nowdate", date1);
76.
Log.e("", cur.getString(cur.getColumnIndex("sindate")));
77.
alist.add(rowMap);
78.
}
79.
return alist;
80.
}catch(Exception e){
81.
return alist;
82.
}
83.
84.
}
85.
}
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