我有一个带日期的列表视图，所以一旦你运行应用程序，它会自动显示日期（非数据库项目）。我的问题是如何在同一个列表视图中插入和查看来自 sqlite 数据库的数据。
前任。
List item
Current date //default text
text1
List item2
next date //default text
text1
这是我的活动代码
{
SimpleDateFormat curFormater = new SimpleDateFormat("EEE, MMM dd, yyyy");
GregorianCalendar date = new GregorianCalendar();
final String[] datas = new String[3];
for (int day = 0; day <7 ; day++) {
datas[day] = curFormater.format(date.getTime());//to automatically show the date in listview
date.roll(Calendar.DAY_OF_YEAR, true);
}
}
// @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_planner);
lview = (ListView) findViewById(R.id.listView2);
lviewAdapter = new ListViewAdapter(this,datas);
lview.setAdapter(lviewAdapter);
我的基础适配器
public class ListViewAdapter extends BaseAdapter
{
Activity context;
//String title[];
//String description[];
String mo[];
public int getCount() {
// TODO Auto-generated method stub
return mo.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
// TextView txtViewTitle;
//TextView txtViewDescription;
TextView mo;
}
public View getView(int position, View convertView, ViewGroup parent)
{
// TODO Auto-generated method stub
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.listitem_row, null);
holder = new ViewHolder();
// holder.txtViewTitle = (TextView) convertView.findViewById(R.id.textView1);
//holder.txtViewDescription = (TextView) convertView.findViewById(R.id.textView2);
holder.mo = (TextView) convertView.findViewById(R.id.textView3);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.mo.setText(mo[position]);
return convertView;
}
我的数据库
public class DataListView extends ListActivity {
private ArrayList<String> results = new ArrayList<String>();
private String tableName = DBHelper.tableName;
private SQLiteDatabase newDB;
/** Called when the activity is first created. */
@SuppressLint("SimpleDateFormat")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
openAndQueryDatabase();
displayResultList();
}
private void displayResultList() {
TextView tView = new TextView(this);
tView.setText("This data is retrieved from the database and only 4 " +
"of the results are displayed");
//getListView().addHeaderView(tView);
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,results));
}
private void openAndQueryDatabase() {
try {
DBHelper dbHelper = new DBHelper(this.getApplicationContext());
newDB = dbHelper.getWritableDatabase();
Cursor c = newDB.rawQuery("SELECT FirstName, Age FROM " +
tableName +
" where Age > 10 LIMIT 4", null);
if (c != null ) {
if (c.moveToFirst()) {
do {
String firstName = c.getString(c.getColumnIndex("FirstName"));
int age = c.getInt(c.getColumnIndex("Age"));
results.add("Name: " + firstName + ",Age: " + age);
}while (c.moveToNext());
}
}
} catch (SQLiteException se ) {
Log.e(getClass().getSimpleName(), "Could not create or Open the database");
} finally {
if (newDB != null)
newDB.execSQL("DELETE FROM " + tableName);
newDB.close();
}
}
我的数据库助手
public SQLiteDatabase DB;
public String DBPath;
public static String DBName = "sample";
public static final int version = '1';
public static Context currentContext;
public static String tableName = "Resource";
public DBHelper(Context context) {
super(context, DBName, null, version);
currentContext = context;
DBPath = "/data/data/" + context.getPackageName() + "/databases";
createDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
private void createDatabase() {
boolean dbExists = checkDbExists();
if (dbExists) {
// do nothing
} else {
DB = currentContext.openOrCreateDatabase(DBName, 0, null);
DB.execSQL("CREATE TABLE IF NOT EXISTS " +
tableName +
" (LastName VARCHAR, FirstName VARCHAR," +
" Country VARCHAR, Age INT(3));");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('M','Sing','India',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('C','Raje','India',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('D','Phonu','Argentina',20);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('V','Veera','EU',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('T','Shenoi','Bangla',25);");
DB.execSQL("INSERT INTO " +
tableName +
" Values ('L','Lamha','Australia',20);");
}
}
private boolean checkDbExists() {
SQLiteDatabase checkDB = null;
try {
String myPath = DBPath + DBName;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);