自从我向数据库添加新表以来，我一直收到此错误，不知道为什么。我已经做过几次这种方法，没有遇到任何错误，但现在发生了这种情况，sqlite 就像女人一样，你第一次做某事，一切看起来都很好，但当你再次做同样的事情时，他们就会开始疯狂出于某种原因。
无论如何，这里有一些相关代码:
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.selectorcreatemove);
allFunctions();
}
private void allFunctions() {
addMove = (Button) findViewById(R.id.bAddMove);
etAddMove = (EditText) findViewById(R.id.etMoveName);
MoveList = (ListView) findViewById(R.id.lvMoveItems);
SQLHandlerview = new SQLHandler(this);
SQLHandlerview = new SQLHandler(ListMovingNames.this);
SQLHandlerview.open();
cursor = SQLHandlerview.getMove();
startManagingCursor(cursor);
String[] from = new String[]{SQLHandler.KEY_MOVENAME};
int[] to = new int[]{R.id.text};
SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.row, cursor, from, to);
MoveList.setAdapter(cursorAdapter);
addMove.setOnClickListener(new OnClickListener() {
@SuppressLint("NewApi")
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
MoveList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, final View view, int position,
long id) {
// TODO Auto-generated method stub
AlertDialog load = new AlertDialog.Builder(ListMovingNames.this).show();
load.setContentView(R.layout.load);
move = ((TextView) view).getText().toString();
Intent i = new Intent(getApplicationContext(), StartMoving.class);
i.putExtra("moveName", move);
startActivity(i);
}
});
etAddMove.setOnKeyListener(new OnKeyListener() {
@SuppressLint("NewApi")
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if ( (event.getAction() == KeyEvent.ACTION_DOWN ) && (keyCode== KeyEvent.KEYCODE_ENTER) )
{
String ssmoveName = etAddMove.getText().toString();
int x = ssmoveName.length() - 1;
if (ssmoveName.equals("") || Character.isWhitespace(ssmoveName.charAt(0)) || Character.isWhitespace(ssmoveName.charAt(x))) {
Toast.makeText(ListMovingNames.this,
"Please enter a valid name! Avoid giving a blank name or white space at the beginning or end of the name",
Toast.LENGTH_LONG).show();
}else{
try {
String scheck = SQLHandlerview.checkMove(ssmoveName);
if (scheck.equals(ssmoveName)) {
Toast.makeText(ListMovingNames.this, "Move name already exist please give a different name", Toast.LENGTH_LONG).show();
} else{
AlertDialog load = new AlertDialog.Builder(ListMovingNames.this).show();
load.setContentView(R.layout.load);
SQLHandlerview.createMove(ssmoveName);
SQLHandlerview.createList();
SQLHandlerview.setTodo(ssmoveName);
Intent i = new Intent(getApplicationContext(), StartMoving.class);
i.putExtra("moveName", ssmoveName);
startActivity(i);
}
} catch (Exception e) {
// TODO Auto-generated catch block
AlertDialog load = new AlertDialog.Builder(ListMovingNames.this).show();
load.setContentView(R.layout.load);
SQLHandlerview.createMove(ssmoveName);
SQLHandlerview.createList();
SQLHandlerview.setTodo(ssmoveName);
Intent i = new Intent(getApplicationContext(), StartMoving.class);
i.putExtra("moveName", ssmoveName);
startActivity(i);
}
}
return true;
}
return false;
}
});
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
allFunctions();
SQLHandlerview.open();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
@Override
protected void onDestroy(){
super.onDestroy();
if (SQLHandlerview != null) {
SQLHandlerview.close();
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
// do something on back.
Intent i = new Intent(ListMovingNames.this, MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
return true;
}
return super.onKeyDown(keyCode, event);
}
}
这是 sql 处理程序
public class SQLHandler {
public static final String KEY_MOVENAME = "movename";
public static final String KEY_ID1 = "_id";
public static final String KEY_ID5 = "_id";
public static final String KEY_MOVEDATE = "movedate";
public static final String KEY_TOTALMOVEWEIGHT = "totalmoveweight";
public static final String KEY_TOTALITEM = "totalitem";
private static final String DATABASE_NAME = "mymovingfriend";
private static final int DATABASE_VERSION = 1;
public static final String KEY_LISTITEMNAME = "listitemname";
public static final String KEY_LISTITEMWEIGHT = "listitemweight";
public static final String KEY_LISTITEMROOM = "listitemroom";
private static final String DATABASE_TABLE1 = "movingname";
private static final String DATABASE_TABLE5 = "lisitem";
public static final String CREATE_TABLE_1 = "CREATE TABLE " + DATABASE_TABLE1 + " (" +
KEY_ID1 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
KEY_MOVEDATE + " TEXT NOT NULL, " +
KEY_TOTALMOVEWEIGHT + " TEXT NOT NULL, " +
KEY_TOTALITEM + " INTEGER NOT NULL, " +
KEY_MOVENAME + " TEXT NOT NULL);";
public static final String CREATE_TABLE_5 = "CREATE TABLE " + DATABASE_TABLE5 + " (" +
KEY_ID5 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
KEY_LISTITEMNAME + " TEXT NOT NULL, " +
KEY_LISTITEMWEIGHT + " TEXT NOT NULL, " +
KEY_LISTITEMROOM + " TEXT NOT NULL);";
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_TABLE_1);
db.execSQL(CREATE_TABLE_5);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldversion, int newversion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE1);
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE5);
onCreate(db);
}
}
public SQLHandler(Context c){
ourContext = c;
}
public SQLHandler open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourDatabase.close();
ourHelper.close();
}
public long createMove(String smovename){
ContentValues cv = new ContentValues();
cv.put(KEY_MOVENAME, smovename);
cv.put(KEY_MOVEDATE, "Not yet set");
cv.put(KEY_TOTALMOVEWEIGHT, "0");
cv.put(KEY_TOTALITEM, 0);
return ourDatabase.insert(DATABASE_TABLE1, null, cv);
}
public void createList(){
ContentValues cv = new ContentValues();
String[] sroom = new String[]{"Kitchen", "Bedroom", "Dinning Room"};
String[] sitem = new String[]{"Dishwasher", "Bed", "Table"};
String[] sweight = new String[]{"40", "25", "15"};
for (int i = 0; i < sroom.length; i++) {
cv.put(KEY_LISTITEMROOM, sroom[i]);
cv.put(KEY_LISTITEMNAME, sitem[i]);
cv.put(KEY_LISTITEMWEIGHT, sweight[i]);
ourDatabase.insert(DATABASE_TABLE5, null, cv);
}
}
public ArrayList<String> getitems(){
String[] columns = new String[]{KEY_ID5, KEY_ITEMNAME};
Cursor c = ourDatabase.query(DATABASE_TABLE5, columns, null, null, null, null, null);
ArrayList<String> items = new ArrayList<String>();
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
items.add(c.getString(1));
}
return items;
}
public ArrayList<String> getitemweight(){
String[] columns = new String[]{KEY_ID5, KEY_ITEMWEIGHT};
Cursor c = ourDatabase.query(DATABASE_TABLE5, columns, null, null, null, null, null);
ArrayList<String> items = new ArrayList<String>();
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
items.add(c.getString(1));
}
return items;
}
public ArrayList<String> getitemclass(){
String[] columns = new String[]{KEY_ID5, KEY_LISTITEMROOM};
Cursor c = ourDatabase.query(DATABASE_TABLE5, columns, null, null, null, null, null);
ArrayList<String> items = new ArrayList<String>();
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
items.add(c.getString(1));
}
return items;
}
}
最佳答案
私有(private)静态最终 int DATABASE_VERSION = 1;
该值仍然等于 1。我假设这是您在创建数据库时使用的值。 onCreate() 仅在第一次在设备上调用 DbHelper 时调用。除非 DATABASE_VERSION 的值发生更改，否则不会调用 onUpgrade。这意味着您的新表从未在数据库中实际创建。
尝试设置 DATABASE_VERSION = 2。
------编辑-----
DATABASE_TABLE5 的值似乎存在拼写错误。
私有(private)静态最终字符串DATABASE_TABLE5 =“lisitem”;
----如果查询返回 0 个结果，for 循环将失败-----
用途:
如果(c.moveToFirst()){
do{
items.add(c.getString(1);
c.moveToNext();
}while(!c.isAfterLast());
}
关于android - 完成尚未停用或关闭的游标，并且在 sqlite 中没有此类表列表项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12945974/