0
我正在創建一個android應用程序，其中包含一個列表視圖，當一個按鈕被點擊時列表視圖被包含在sqlite中的數據填充。我做了一些事情下面我沒有得到任何錯誤，但它並沒有表現出任何檢索data.Please幫我這個 這是我的活動當按鈕點擊：如何顯示列表視圖填充從android中的sqlite數據填充
fetch_database.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progressGenerator.start(fetch_database);
media_player = media_player.create(DatabaseListView.this, R.raw.retrievingfromdatabase);
media_player.start();
String[] from = {logindatabase_adapter.USER_NAME,logindatabase_adapter.USER_PASSWORD};
int[] to = {R.id.txt_username,R.id.txt_pasword};
cursor = logindatabase_adapter.feching_Data();
cursoradapter = new SimpleCursorAdapter(DatabaseListView.this, R.layout.listcell, cursor, from, to);
database_results.setAdapter(cursoradapter);
}
});
這是我logindatabase適配器：
package com.developer.milanandroid;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.view.View;
public class LoginDataBaseAdapter
{
//Database name
static final String DATABASE_NAME = "MilanloginRegistration.db";
static final int DATABASE_VERSION = 1;
public static final int NAME_COLUMN = 1;
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
public static final String TABLE_NAME="MilanLoginregistration";
public static final String ID="_id";
public static final String USER_NAME="USERNAME";
public static final String USER_PASSWORD ="PASSWORD";
static final String DATABASE_CREATE = "create table "+ TABLE_NAME +
"(" +ID+" integer primary key autoincrement,"+"USERNAME text UNIQUE,"+USER_PASSWORD+" text); ";
// 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 DataBaseHelper dbHelper;
public LoginDataBaseAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public LoginDataBaseAdapter 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)
{
ContentValues newValues = new ContentValues();
newValues.put("USERNAME",username);
newValues.put("PASSWORD",password);
// Insert the row into your table
db.insert("MilanLoginregistration",null,newValues);
///Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
}
public int deleteEntry(String username,String password)
{
//String id=String.valueOf(ID);
String where="USERNAME=?";
int numberOFEntriesDeleted= db.delete("MilanLoginregistration", where, new String[]{username,password}) ;
// Toast.makeText(context, "Number fo Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
return numberOFEntriesDeleted;
}
public Cursor feching_Data(){
String[] columns = {ID,USER_NAME,USER_PASSWORD};
db = dbHelper.getWritableDatabase();
Cursor cursor = db.query(TABLE_NAME, columns,null,null,null,null,null);
return cursor;
}
public String getSinlgeEntry(String userName)
{
Cursor cursor=db.query("MilanLoginregistration", 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 String checkSinlgeEntry(String userName)
{
Cursor cursor=db.query("MilanLoginregistration", null, " USERNAME=?", new String[]{userName}, null, null, null);
if(cursor.getCount()>=1) // UserName Exist
{
cursor.close();
return "NOT EXIST";
}
cursor.close();
return "";
}
public void updateEntry(String user_name,String pasword)
{
// Define the updated row content.
ContentValues updatedValues = new ContentValues();
// Assign values for each row.
updatedValues.put("USERNAME", user_name);
updatedValues.put("PASSWORD",pasword);
String where="USERNAME = ?";
db.update("MilanLoginregistration",updatedValues, where, new String[]{user_name});
}
/*public void Display(View v){
Cursor c = db.rawQuery("select * from MilanloginRegistration", null);
admin_settings_child.text_fetched_database_results.setText("");
c.moveToFirst();
do{
String username = c.getString(c.getColumnIndex("USERNAME"));
String password = c.getString(1);
admin_settings_child.text_fetched_database_results.append("USERNAME::-->"+username+"PASSWORD::-->"+password+"\n");
}while(c.moveToNext());
}*/
}
你有feching_Data的設置是在存在的情況下，沒有數據或者空？它會在之後移動到第一個入口嗎？看起來沒有，你應該確保你實現這些安全衛士。 – Kat