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私はsqliteファイルをチェックしても、上記のエラーが発生していますが、テーブルにエントリがないのにウォッチリストテーブルが含まれています。android.database.sqlite.SQLiteException：いいえそのようなテーブル：
DBAdapter.java
package hp.vamazon;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBAdapter {
private static final String TAG = "DBAdapter"; //used for logging database version changes
// Field Names:
public static final String bookID = "bookid";//==KEYROW_ID
public static final String bookName = "bookname";//==KEY_TASK
public static final String bookPrice = "bbp";//==KEY_DATE
public static final String storeName = "storename";
public static final String[] ALL_KEYS = new String[] {bookID,bookPrice,bookName,storeName};
// Column Numbers for each Field Name:
public static final int COL_ROWID = 0;
public static final int COL_TASK = 1;
public static final int COL_DATE = 2;
public static final int COL_STORE = 3;
// DataBase info:
public static final String DATABASE_NAME = "bookstore";
public static final String DATABASE_TABLE = "watchlist";
public static final int DATABASE_VERSION = 2; // The version number must be incremented each time a change to DB structure occurs.
//SQL statement to create database
private static final String DATABASE_CREATE_SQL =
"CREATE TABLE " + DATABASE_TABLE
+ " (" + bookID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ bookName + " TEXT NOT NULL, "
+ bookPrice + " TEXT, "
+ bookPrice + " TEXT "
+ ");";
private final Context context;
private DatabaseHelper myDBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx) {
this.context = ctx;
myDBHelper = new DatabaseHelper(context);
}
// Open the database connection.
public DBAdapter open() {
db = myDBHelper.getWritableDatabase();
return this;
}
// Close the database connection.
public void close() {
myDBHelper.close();
}
// Add a new set of values to be inserted into the database.
public long insertRow(String bookname, String price,String id ,String store) {
ContentValues initialValues = new ContentValues();
initialValues.put(bookID,id);
initialValues.put(bookPrice,price);
initialValues.put(bookName,bookname);
initialValues.put(storeName,store);
// Insert the data into the database.
return db.insert(DATABASE_TABLE, null, initialValues);
}
// Delete a row from the database, by rowId (primary key)
public boolean deleteRow(long rowId) {
String where = bookID + "=" + rowId;
return db.delete(DATABASE_TABLE, where, null) != 0;
}
public void deleteAll() {
Cursor c = getAllRows();
long rowId = c.getColumnIndexOrThrow(bookID);
if (c.moveToFirst()) {
do {
deleteRow(c.getLong((int) rowId));
} while (c.moveToNext());
}
c.close();
}
// Return all data in the database.
public Cursor getAllRows() {
String where = null;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Get a specific row (by rowId)
public Cursor getRow(long rowId) {
String where = bookID + "=" + rowId;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS,
where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Change an existing row to be equal to new data.
public boolean updateRow(long rowId, String task, String date) {
String where = bookID + "=" + rowId;
ContentValues newValues = new ContentValues();
newValues.put(bookName, task);
newValues.put(bookPrice, date);
// Insert it into the database.
return db.update(DATABASE_TABLE, newValues, where, null) != 0;
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase _db) {
db.execSQL(DATABASE_CREATE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
}
}
}
hp.vamazon.Watchlist.populatListViewFromDBでhp.vamazon.DBAdapter.getAllRowsでWatchlist.java
package hp.vamazon;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class Watchlist extends Activity {
DBAdapter myDb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_watchlist);
openDb();
populatListViewFromDB();
}
private void openDb() {
myDb=new DBAdapter(this);
myDb.open();
}
private void populatListViewFromDB() {
Cursor cursor=myDb.getAllRows();
startManagingCursor(cursor);
String []fromFieldNames=new String[]{DBAdapter.bookName,DBAdapter.bookPrice,DBAdapter.storeName};
int []toViewIDs=new int[]{R.id.item_name,R.id.item_price,R.id.item_store};
SimpleCursorAdapter myCursorAdapter=new SimpleCursorAdapter(this,R.layout.cartitem_view
,cursor,fromFieldNames,toViewIDs);
ListView myList=(ListView)findViewById(R.id.listView1);
myList.setAdapter(myCursorAdapter);
}
private void registerClickCallback()
{
ListView myList=(ListView)findViewById(R.id.listView1);
myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Cursor cursor=myDb.getRow(id);
if(cursor.moveToFirst())
{
myDb.deleteRow(id);
populatListViewFromDB();
}
cursor.close();
}
});
}
}
（DBAdapter.java:93）
（ Watchlist.java:37）
あなたの努力のおかげで、私は自分自身で問題を解決しました。問題は、データベースを持っていないので、データベースの例外をスローするコードを引き起こしていたすべての関数で、SQLiteデータベースの新しいインスタンスを定義しなかったことです。 –