Java 如何使用sqlite+;listview+;OnlistItem是否单击开始新活动?游标读取错误
借助于此,我制作了一个包含3项活动的应用程序。 在First活动(导入)中,我只将一些值导入sqlite数据库 这是我的DatabaseHelper类:Java 如何使用sqlite+;listview+;OnlistItem是否单击开始新活动?游标读取错误,java,android,sqlite,listview,cursor,Java,Android,Sqlite,Listview,Cursor,借助于此,我制作了一个包含3项活动的应用程序。 在First活动(导入)中,我只将一些值导入sqlite数据库 这是我的DatabaseHelper类: public class DatabaseHelper_bp extends SQLiteOpenHelper { private static final String DATABASE_NAME = "bpDB"; private static final int DATABASE_VERSION = 1;
public class DatabaseHelper_bp extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "bpDB";
private static final int DATABASE_VERSION = 1;
// Database creation sql statement
private static final String DATABASE_CREATE = "create table bp_import ( _id integer primary key, datetime text not null, systolic text not null, diastolic text not null, pulses text not null, notes text not null);";
public DatabaseHelper_bp(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Method is called during creation of the database
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
// Method is called during an upgrade of the database,
@Override
public void onUpgrade(SQLiteDatabase database, int oldVersion,
int newVersion) {
Log.w(DatabaseHelper_bp.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
database.execSQL("DROP TABLE IF EXISTS bp_import");
onCreate(database);
}
}
和我的DAO类,用于我的度量/值:
public class BpDAO {
private DatabaseHelper_bp dbHelper;
private SQLiteDatabase database;
/**
* Movie table related constants.
*/
public final static String bp_TABLE = "bp_import";
public final static String bp_ID = "_id";
public final static String bp_DT = "datetime";
public final static String bp_SYS = "systolic";
public final static String bp_DIA = "diastolic";
public final static String bp_PUL = "pulses";
public final static String bp_NOT = "notes";
/**
*
* @param context
*/
public BpDAO(Context context) {
dbHelper = new DatabaseHelper_bp(context);
database = dbHelper.getWritableDatabase();
}
/**
* \ Creates a new blood pressure measure
*
* @param datetime
* @param systolic
* @param diastolic
* @param pulses
* @param notes
* @return
*/
public long importBP(String datetime, String systolic, String diastolic,
String pulses, String notes) {
ContentValues values = new ContentValues();
values.put(bp_DT, datetime);
values.put(bp_SYS, systolic);
values.put(bp_DIA, diastolic);
values.put(bp_PUL, pulses);
values.put(bp_NOT, notes);
return database.insert(bp_TABLE, null, values);
}
/**
* Fetch all movies
*
* @return
*/
public Cursor fetchAll_bp() {
Cursor mCursor = database.query(true, bp_TABLE, new String[] { bp_SYS,
bp_DIA, bp_DT, bp_ID }, null, null, null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
}
在第二个活动(历史记录)中,我有一个列表活动,其中包含数据库每一行的一些值。所有这些都在这里工作正常。列表由数据库填充,所有都正常
但我的问题是当我尝试onListItem单击启动一个新的3活动(详细信息)并将所选度量值(ListItem)的所有值传递给它时,应用程序强制关闭
以下是2项活动的代码(历史记录):
}
这是logcat:
16:50:48.513: D/BPT(562): Selected bp id =11
16:50:48.513: **E/CursorWindow(562): Failed to read row 1, column -1 from a CursorWindow which has 13 rows, 4 columns.**
在BpDAO类中的数据库查询方法fetchAll_bp()中,您似乎忘记在查询中包含注释(bp_NOT)。因此,请怀疑它失败了,因为onClickListener正在查找不在光标中的bp_,而光标不包含该bp_。在BpDAO类中的数据库查询方法fetchAll_bp()中,您似乎忘记了在查询中包含注释(bp_NOT)。因此,请怀疑它失败了,因为您的onClickListener正在查找不在光标中的bp_,而它不包含该bp_。试试这个
Cursor selectedBpDetails = (Cursor) l.getItemAtPosition(position);
if (selectedBpDetails.getCursor() > 0) {
selectedBpDetails.moveToFirst();
String bp_DT = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_DT));
String bp_SYS = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_SYS));
String bp_DIA = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_DIA));
String bp_PUL = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_PUL));
String bp_NOT = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_NOT));
}
试试这个
Cursor selectedBpDetails = (Cursor) l.getItemAtPosition(position);
if (selectedBpDetails.getCursor() > 0) {
selectedBpDetails.moveToFirst();
String bp_DT = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_DT));
String bp_SYS = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_SYS));
String bp_DIA = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_DIA));
String bp_PUL = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_PUL));
String bp_NOT = selectedBpDetails.getString(selectedBpDetails
.getColumnIndex(BpDAO.bp_NOT));
}
数据库表中的函数fetchAll\u bp不包含任何notes条目,这可能是导致错误的原因。数据库表中的函数fetchAll\u bp不包含任何notes条目,这可能是导致错误的原因