我想添加一个TIMESTAMP列到我的SQLite数据库。该列将用于使用“System.currentTimeMillis();”来捕获时间戳记数据。应用程序崩溃,错误来自下面的** **行所示的光标代码。错误信息为“无法启动活动ComponentInfo {... ListActivity}:java.lang.IllegalStateException:无法从CursorWindow读取第0行,第6列。确保游标在从中访问数据前正确初始化。Android:我如何解决时间戳添加到我的SQLite数据库?
最初,我在模型文件中将变量设置为字符串。然后我尝试了很长时间,但都没有成功。我在这里错过了什么?
的UserData文件:
...
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
DatabaseHelper.java文件:
...
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE IF NOT EXISTS " + DBContract.DBEntry.TABLE_NAME +
"(" + DBContract.DBEntry.COLUMN_NAME_ID +
" INTEGER PRIMARY KEY AUTOINCREMENT,"
+ DBContract.DBEntry.COLUMN_NAME_TODO +
" TEXT,"
+ DBContract.DBEntry.COLUMN_NAME_NOTE1 +
" TEXT,"
+ DBContract.DBEntry.COLUMN_NAME_NOTE2 +
" TEXT,"
+ DBContract.DBEntry.COLUMN_NAME_DUEDATE +
" TEXT,"
+ DBContract.DBEntry.COLUMN_NAME_DUETIME +
" TEXT,"
+ DBContract.DBEntry.COLUMN_NAME_TIMESTAMP +
" TEXT" + ")";
...
public void insertIntoDB(String todo, String note1, String note2, String duedate, String duetime, long timestamp) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(DBContract.DBEntry.COLUMN_NAME_TODO, todo);
values.put(DBContract.DBEntry.COLUMN_NAME_NOTE1, note1);
values.put(DBContract.DBEntry.COLUMN_NAME_NOTE2, note2);
values.put(DBContract.DBEntry.COLUMN_NAME_DUEDATE, duedate);
values.put(DBContract.DBEntry.COLUMN_NAME_DUETIME, duetime);
values.put(DBContract.DBEntry.COLUMN_NAME_TIMESTAMP, timestamp);
db.insert(DBContract.DBEntry.TABLE_NAME, null, values);
db.close();
}
...
Cursor cursor = db.rawQuery(query,null);
try {
if (cursor.moveToFirst()) {
do {
UserData userData = new UserData();
userData.setTodo(cursor.getString(1));
userData.setNote1(cursor.getString(2));
userData.setNote2(cursor.getString(3));
userData.setDuedate(cursor.getString(4));
userData.setDuetime(cursor.getString(5));
**userData.setTimestamp(cursor.getLong(6));**
modelList.add(0, userData);
} while (cursor.moveToNext());
...
ListAdapter.java文件:
...
public void onBindViewHolder(final ListViewHolder holder, final int position) {
...
holder.cardBlankText5.setText((int) dbList.get(position).getTimestamp());
Activity.java文件:
...
public void onClickSave(View v) {
...
long timestamp=System.currentTimeMillis();
helper = new DatabaseHelper(Activity.this);
helper.insertIntoDB(todo,note1,note2,duedate,duetime,timestamp);
startActivity(new Intent(Activity.this,ListActivity.class));
}
,你看到了什么? – pskink
显示查询。 –
@CL你的意思是调用dumpCursor并显示Logcat结果? – AJW