私はsqliteを使って簡単なアプリを作っています。これに関連して非常に多くの質問をしましたが、あまり返事がありませんでした。
別のアクティビティで使用したい削除機能に問題があります。しかし、それは機能しません.Custom Listviewを使用しているため、動的に作成されたリストの行に2つのボタンがあります.1つはコンテンツを更新するためのもので、もう1つはリストの行を削除するためのものです.
実際に私が得ている問題は、各行のボタンを使用して行を削除するときです。リスト ビューの最初の項目のみを削除します。完全にめちゃくちゃ。これで私を助けてください
参照:
データベース ハンドラクラス:
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "tt";
// Table names
private static final String TABLE_INCOME = "income";
//private static final String TABLE_INCOME = "income";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_PRICE = "price";
private static final String KEY_TYPE = "type";
private static final String KEY_DATE = "date";
private static final String KEY_DESCRIPTION = "description";
private static final String KEY_PAY_MODE = "pay_mode";
Context c;
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_INCOME_TABLE = "CREATE TABLE if not exists " + TABLE_INCOME + "("
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ KEY_PRICE + " REAL,"
+ KEY_TYPE + " TEXT,"
+ KEY_DATE + " TEXT,"
+ KEY_DESCRIPTION + " TEXT,"
+ KEY_PAY_MODE + " TEXT"
+")";
db.execSQL(CREATE_INCOME_TABLE);
Log.d(TABLE_INCOME, "table created with "+ KEY_PRICE +" "+ KEY_TYPE +" "
+ KEY_DATE +" " + KEY_DESCRIPTION +" " + KEY_PAY_MODE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_INCOME);
// Create tables again
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
// Adding new income
void addContact(Income income) {
try{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_PRICE, income.getPrice());
values.put(KEY_TYPE, income.getType());
values.put(KEY_DATE, income.getDate());
values.put(KEY_DESCRIPTION, income.getDescription());
values.put(KEY_PAY_MODE, income.getPaymode());
// Inserting Row
db.insert(TABLE_INCOME, null, values);
db.close(); // Closing database connection
}
catch(Exception e){
e.printStackTrace();
}
}
// Getting single income
Income getContact(int id) {
Income income = null;
try{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_INCOME, new String[] { KEY_ID, KEY_PRICE,
KEY_TYPE, KEY_DATE , KEY_DESCRIPTION, KEY_PAY_MODE}, null, null, null, null, null);
if (cursor.moveToFirst()) {
income = new Income(Integer.parseInt(cursor.getString(0)),Long.parseLong(cursor.getString(1)),
cursor.getString(2), cursor.getString(3),cursor.getString(4),cursor.getString(5));
Log.d("Genrated..", "Sending data");
}
}
catch(Exception e){
e.printStackTrace();
}
// return income
return income;
}
// Getting All Income
public List<Income> getAllContacts() {
List<Income> contactList = new ArrayList<Income>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_INCOME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Income income = new Income();
income.setPrice(Long.parseLong(cursor.getString(1)));
income.setType(cursor.getString(2));
income.setDate(cursor.getString(3));
income.setDescription(cursor.getString(4));
income.setPaymode(cursor.getString(5));
// Adding income to list
contactList.add(income);
} while (cursor.moveToNext());
}
// return income list
return contactList;
}
// Updating single income
public int updateContact(Income income) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_PRICE, income.getPrice());
values.put(KEY_TYPE, income.getType());
values.put(KEY_DATE, income.getDate());
values.put(KEY_DESCRIPTION, income.getDescription());
values.put(KEY_PAY_MODE, income.getPaymode());
// updating row
return db.update(TABLE_INCOME, values, null, null);
}
//Deleting single income
public void deleteContact(Income income) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_INCOME, KEY_ID + " = ?",new String[] { String.valueOf(income.getID()) });
db.close();
}
// Getting income Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_INCOME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
別のアクティビティでの実装:
String b = Long.toString(_incomelist.get(position).getPrice());
Typeface tf = Typeface.createFromAsset(getAssets(), "font/Rupee_Foradian.ttf");
viewHolder.txt_price.setTypeface(tf);
viewHolder.txt_id.setText(Integer.toString(_incomelist.get(position).getID()).trim());
viewHolder.txt_price.setText("` "+b.trim());
viewHolder.txt_type.setText(_incomelist.get(position).getType().trim());
viewHolder.txt_date.setText(_incomelist.get(position).getDate().trim());
viewHolder.txt_desc.setText(_incomelist.get(position).getDescription().trim());
viewHolder.txt_pmode.setText(_incomelist.get(position).getPaymode().trim());
final int temp = position;
(convertView.findViewById(R.id.imageButton2))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
AlertDialog.Builder alertbox = new AlertDialog.Builder(
ViewContact.this);
alertbox.setCancelable(true);
alertbox.setMessage("Are you sure you want to delete ?");
alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
try{
Income income = db.getContact(temp);
db.deleteContact(income); //here using my delete function
ViewContact.this.onResume();
Toast.makeText(getApplicationContext(),"Deleted..",Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
e.printStackTrace();
}
}
});
alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
}
});
alertbox.show();
}
});