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我有一个错误，当我尝试使用ListAdapter在片段类阅读我的数据库。我觉得这是不是一个严重的错误，解决并没有太多的代码来检查，但我不知道为什么我得到这个错误：“java.lang.IllegalArgumentException异常：列‘主题’不存在”。 我在我的片段类函数databaseView（）应该读我的数据库，所以我做了一个请求，让所有的数据，所以我应该得到的所有列。的Android Contente提供程序错误：“java.lang.IllegalArgumentException异常：列‘主题’不存在”
我甚至可以用我的内容提供商加入我的数据库中的新条目（从另一个片段类），我与铬“sqliteviewer”检查，它工作得很好。
创建我的数据库有此要求：
"create table "+ STOCK_TABLE + " (_id INTEGER PRIMARY KEY AUTOINCREMENT, THEME TEXT, QUESTION TEXT, REPONSE TEXT, DIFFICULTE FLOAT)"
这里是我的片段类：
public class ViewCardEditor extends Fragment {
StockCard stock;
ViewGroup container;
ListView listView;
SimpleCursorAdapter cursorAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup c,
Bundle savedInstanceState) {
container = c;
View view = inflater.inflate(R.layout.fragment_view_card_editor, container, false);
// Inflate the layout for this fragment
if (container != null) {
container.removeAllViews();
}
listView = (ListView) view.findViewById(R.id.listView);
stock = new StockCard(c.getContext());
databaseView();
return view;
}
public void databaseView()
{
ArrayList<String> list = new ArrayList<>();
Cursor cursor = stock.getData();
if(cursor.getCount() == 0)
{
Toast.makeText(container.getContext(), "Aucunes cartes en stock !!", Toast.LENGTH_LONG).show();
}
else
{
while(cursor.moveToNext())
{
list.add(cursor.getString(0));
list.add(cursor.getString(1));
list.add(cursor.getString(2));
list.add(cursor.getString(3));
list.add(cursor.getString(4));
//HERE is where I get my exception :
ListAdapter adapter = new SimpleCursorAdapter(container.getContext(),
R.layout.card_stock,
cursor,
new String[]{stock._ID,
stock.THEME,
stock.QUESTION,
stock.REPONSE,
stock.DIFFICULTE},
new int[]{R.id.idList, R.id.themeList, R.id.questionList, R.id.reponseList, R.id.difficultList}, 0);
listView.setAdapter(adapter);
}
}
}
}
而且我SQLiteOpenHelper类
public class StockCard extends SQLiteOpenHelper {
public static final String STOCK_NAME ="StockCard.db";
public static final String STOCK_TABLE = "Carte_table";
private static int VERSION = 1;
public static final String _ID = "_id";
public static final String THEME = "theme";
public static final String QUESTION = "question";
public static final String REPONSE = "reponse";
public static final String DIFFICULTE = "difficulte";
private static StockCard instance;
//Constructeur pour AddCardEditor (Fragment de CardEditor) et ses fonctions
public StockCard(Context context) {
super(context, STOCK_NAME, null, VERSION);
//SQLiteDatabase db = this.getWritableDatabase();
}
public static StockCard getInstance(Context context) {
if(instance == null){
instance = new StockCard(context);
}
return instance;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table "+ STOCK_TABLE + " (_id INTEGER PRIMARY KEY AUTOINCREMENT, THEME TEXT, QUESTION TEXT, REPONSE TEXT, DIFFICULTE FLOAT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if(newVersion > oldVersion)
{
db.execSQL("DROP TABLE IF EXISTS "+STOCK_TABLE);
onCreate(db);
}
}
public Cursor getData()
{
SQLiteDatabase db = this.getWritableDatabase();
Cursor data = db.rawQuery("select * from "+STOCK_TABLE, null);
return data;
}
}
然后我的ContentProvider：
public class CardContentProvider extends ContentProvider {
private StockCard stock;
public static String authority = "com.example.jean.cartememoire.CardContentProvider";
private static String path ="Carte_table";
public static final String _ID = "_id";
public static final String THEME = "theme";
public static final String QUESTION = "question";
public static final String REPONSE = "reponse";
public static final String DIFFICULTE = "difficulte"; //# = un chiffre
public static final String STOCK_TABLE = "Carte_table";
private static final int ID_STOCK_TABLE = 1;
private static final int ID_THEME = 2;
private static final int ID_QUESTION = 3;
private static final int ID_REPONSE = 4;
private static final int ID_DIFFICULTE = 5;
private static final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
matcher.addURI(authority, STOCK_TABLE, ID_STOCK_TABLE);
matcher.addURI(authority, THEME, ID_THEME);
matcher.addURI(authority, QUESTION, ID_QUESTION);
matcher.addURI(authority, REPONSE, ID_REPONSE);
matcher.addURI(authority, DIFFICULTE, ID_DIFFICULTE);
}
@Override
public boolean onCreate() {
stock = StockCard.getInstance(getContext());
return true;
}
@Nullable
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
SQLiteDatabase db = stock.getReadableDatabase();
int code = matcher.match(uri);
long id;
Cursor cursor;
switch (code)
{
case ID_STOCK_TABLE:
cursor = db.query(STOCK_TABLE, projection, selection,
selectionArgs, null, null, sortOrder);
break;
default:
Log.d("Uri provider =", uri.toString());
throw new UnsupportedOperationException("Pas encore implémenté");
}
return cursor;
}
@Nullable
@Override
public String getType(Uri uri) {
return null;
}
@Nullable
@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = stock.getWritableDatabase();
int code = matcher.match(uri);
long id;
Uri.Builder builder = new Uri.Builder();
switch(code)
{
case ID_STOCK_TABLE:
System.out.println(values.toString());
id = db.insert(STOCK_TABLE, null, values);
builder.appendPath(STOCK_TABLE);
break;
default:
throw new UnsupportedOperationException("Pas encore implémenté");
}
builder.authority(authority);
builder = ContentUris.appendId(builder, id);
return builder.build();
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
}
感谢您的帮助，对不起，如果英语不好。
什么是您的数据库模式，列'表'存在？ –
无我有5列： _id，主题，问题，作出反应并difficulte的 –