出于某种原因，我的 ListView 有空白行，如此处的图片所示。我无法删除它们，但使用其中包含数据的行，我可以很好地删除它们。我正在使用 SimpleCursorAdapter、ListAdapter 和 CursorAdapter 从 SQLitedatabase 填充我的 ListView。
管理类
package com.fullfrontalgames.numberfighter;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.CursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Admin extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.admin);
DBAdapter db = new DBAdapter(this);
db.open();
ListView UsernameList = (ListView)findViewById(android.R.id.list);
final Cursor playeraccounts = db.GetAllPlayers();
db.changeCursor(playeraccounts);
String[] from = new String[] {
"USERNAME"
};
int[] to = new int[] {
R.id.AdminTextView
};
ListAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.admin, playeraccounts,
from, to, 0);
UsernameList.setAdapter(cursorAdapter);
abstract class CustomCursorAdapter extends CursorAdapter {
public CustomCursorAdapter(Context context, Cursor c, int flags) {
super(context, playeraccounts, flags);
inflater = LayoutInflater.from(context);
}
LayoutInflater inflater;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.admin, null);
holder = new ViewHolder();
holder.text1 = (TextView)convertView.findViewById(R.id.AdminTextView);
holder.button = (Button)convertView.findViewById(R.id.PlayerDelete);
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
return convertView;
}
class ViewHolder {
TextView text1;
}
holder.text1.setText(position);
holder.button.setText(position);
return convertView;
}
}
}
public void onClickDelete(View view) {
int id = 0;
Button deletebutton = (Button)findViewById(R.id.PlayerDelete);
// TODO Auto-generated method stub
showDialog(id);
}
@Override
public Dialog onCreateDialog(final int id) {
final DBAdapter db = new DBAdapter(this);
db.open();
switch (id) {
case 0:
return new AlertDialog.Builder(this).setIcon(R.drawable.icon)
.setTitle("Would you like to delete this player?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
// TODO Auto-generated method stub
TextView playernames = (TextView)findViewById(R.id.AdminTextView);
String userName = playernames.getText().toString();
db.deleteEntry(userName);
Toast.makeText(getBaseContext(), "Player deleted",
Toast.LENGTH_SHORT).show();
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int whichButton) {
Toast.makeText(getBaseContext(), "Canceled", Toast.LENGTH_SHORT)
.show();
}
})
.create();
}
return null;
}
}
DBAdapter 类
package com.fullfrontalgames.numberfighter;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class DBAdapter {
static final String DATABASE_NAME = "NFDB.db";
static final int DATABASE_VERSION = 2;
public static final int NAME_COLUMN = 1;
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
static final String DATABASE_CREATE = "create table NFDB ("
+ "ID integer primary key autoincrement, " + "USERNAME text,"
+ "PASSWORD text, EMAIL text, NUMBERINPUT text, "
+ "SCORE text, FRIENDS text); ";
static final String CREATE_INDEX_KEYTYPE = "CREATE UNIQUE INDEX idx_keytype ON tableName(USERNAME)";
// Variable to hold the database instance
public SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private final DataBaseHelper DBHelper;
public DBAdapter(Context _context) {
context = _context;
DBHelper = new DataBaseHelper(context, DATABASE_NAME, null,
DATABASE_VERSION);
}
public DBAdapter open() throws SQLException {
db = DBHelper.getWritableDatabase();
return this;
}
public void close() {
db.close();
}
public SQLiteDatabase getDatabaseInstance() {
return db;
}
public void insertEntry(String userName, String password, String email) {
ContentValues newValues = new ContentValues();
// Assign values for each row.
newValues.put("USERNAME", userName);
newValues.put("PASSWORD", password);
newValues.put("EMAIL", email);
// Insert the row into your table
db.insert("NFDB", null, newValues);
// /Toast.makeText(context, "Reminder Is Successfully Saved",
// Toast.LENGTH_LONG).show();
}
public int deleteEntry(String userName) {
// String id=String.valueOf(ID);
String where = "USERNAME=?";
int numberOFEntriesDeleted = db.delete("NFDB", where,
new String[] { userName });
// Toast.makeText(context,
// "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted,
// Toast.LENGTH_LONG).show();
return numberOFEntriesDeleted;
}
public String getSinlgeEntry(String userName) {
Cursor cursor = db.query("NFDB", null, " USERNAME=?",
new String[] { userName }, null, null, null);
if (cursor.getCount() < 1) // UserName Not Exist
{
cursor.close();
return "NOT EXIST";
}
cursor.moveToFirst();
String password = cursor.getString(cursor.getColumnIndex("PASSWORD"));
cursor.close();
return password;
}
public void updateEntry(String userName, String password) {
// Define the updated row content.
ContentValues updatedValues = new ContentValues();
// Assign values for each row.
updatedValues.put("USERNAME", userName);
updatedValues.put("PASSWORD", password);
String where = "USERNAME = ?";
db.update("NFDB", updatedValues, where, new String[] { userName });
}
public String getData() {
String[] columns = new String[] { "ID", "USERNAME" };
Cursor c = db
.query("NFDB", columns, null, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex("ID");
int iName = c.getColumnIndex("USERNAME");
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
result = result + c.getString(iRow) + " " + c.getString(iName)
+ "/n";
}
return result;
}
public String getUsername(String searchName) {
Cursor c = db.query("NFDB", new String[] { "USERNAME" },
"USERNAME = ?", new String[] { searchName }, null, null, null);
if (c.moveToNext())
return c.getString(0);
else
return "";
}
public void InsertScore(String Username, String Score) {
ContentValues ScoreValues = new ContentValues();
ScoreValues.put("USERNAME", Username);
ScoreValues.put("SCORE", Score);
db.insert("NFDB", null, ScoreValues);
}
public String GetGameScore(String Username, String Score) {
Cursor cursor = db.query("NFDB", null, "USERNAME", new String[] {
Username, Score }, null, null, null);
cursor.moveToFirst();
cursor.close();
return Username;
}
public String GetAllScore() {
String[] columns = new String[] { "ID", "USERNAME", "SCORE" };
Cursor cursor = db.query("NFDB", columns, null, null, null, null, null);
String result = "";
int iRow = cursor.getColumnIndex("ID");
int iUsername = cursor.getColumnIndex("USERNAME");
int iScore = cursor.getColumnIndex("SCORE");
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
result = result + cursor.getString(iRow) + " "
+ cursor.getString(iUsername) + " "
+ cursor.getString(iScore) + "/n";
}
return result;
}
public void InsertNumber(String Number) {
ContentValues NumberValues = new ContentValues();
;
NumberValues.put("NUMBERINPUT", Number);
db.insert("NFDB", null, NumberValues);
}
public String GetNumber(String Username, String Number) {
Cursor cursor = db.query("NFDB", null, "USERNAME", new String[] {
Username, Number }, null, null, null, null);
cursor.moveToFirst();
cursor.close();
return Username;
}
public String GetAllNumbers() {
String[] columns = new String[] { "ID", "USERNAME", "NUMBERINPUT" };
Cursor cursor = db.query("NFDB", columns, null, null, null, null, null,
null);
String result = "";
int iRow = cursor.getColumnIndex("ID");
int iName = cursor.getColumnIndex("USERNAME");
int iNumber = cursor.getColumnIndex("NUMBERINPUT");
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
result = result + cursor.getString(iRow) + " "
+ cursor.getString(iName) + " " + cursor.getString(iNumber)
+ "/n";
}
return result;
}
public void InsertFriends(String Friends) {
ContentValues FriendValues = new ContentValues();
FriendValues.put("FRIENDS", Friends);
db.insert("NFDB", null, FriendValues);
}
public int DeleteFriends(String Friends) {
String where = "FRIENDS=?";
int numberOfEntriesDeleted = db.delete("NFDB", where,
new String[] { Friends });
return numberOfEntriesDeleted;
}
public String GetFriend(String Defender) {
Cursor cursor = db.query("NFDB", null, "FRIENDS",
new String[] { Defender }, null, null, null, null);
cursor.moveToFirst();
cursor.close();
return Defender;
}
public int PlayFriend() {
Cursor cursor = db.query("NFDB", null, "FRIENDS", null, null, null,
null, null);
cursor.moveToFirst();
cursor.close();
return 0;
}
public Cursor GetAllFriends() {
return db.rawQuery("select rowid _id,FRIENDS FROM NFDB", null);
}
public int get(String string) {
// TODO Auto-generated method stub
return 0;
}
public Cursor GetAllPlayers() {
return db.rawQuery("select rowid _id,* from NFDB", null);
}
public Cursor GetAllFriends2() {
return db.rawQuery("select rowid _id,FRIENDS FROM NFDB", null);
}
public Cursor changeCursor(Cursor newcursor) {
return newcursor;
}
}