1. 确认数据库路径是否正确，尤其是文件夹名是否正确；
2. 确认数据库是否已经创建，如果未创建，需要通过代码先创建数据库；
3. 确认表名和字段名是否正确；
4. 确认数据类型是否匹配，特别是日期和时间类型；
5. 确认数据库版本号是否正确，注意升级和降级的时候版本号的变化；
6. 如果以上问题都没有解决问题，可以尝试卸载并重新安装应用程序。

以下是一个读取SQLite数据库的范例代码：

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String CREATE_BOOK = "create table Book ("
            + "id integer primary key autoincrement, "
            + "author text, "
            + "price real, "
            + "pages integer, "
            + "name text)";
    private Context mContext;

    public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        mContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_BOOK);
        Toast.makeText(mContext, "Create successed", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

读取数据的代码：

public ArrayList getBook() {
    ArrayList list = new ArrayList<>();
    SQLiteDatabase db = mHelper.getWritableDatabase();
    Cursor cursor = db.query("Book", null, null, null, null, null, null);
    if (cursor.moveToFirst()) {
        do {
            Book book = new Book();
            book.setId(cursor.getInt(cursor.getColumnIndex("id")));
            book.setAuthor(cursor.getString(cursor.getColumnIndex("author")));
            book.setName(cursor.getString(cursor.getColumnIndex("name")));
            book.setPages(cursor.getInt(cursor.getColumnIndex("pages")));
            book.setPrice(cursor.getFloat(cursor.getColumnIndex("price")));
            list.add(book);
        } while (cursor.moveToNext());
    }
    cursor.close();
    return list;
}