您好我已经完成了使用imagebutton显示自定义列表视图。我想使用该按钮删除选定的列表视图行。我尝试在我的dbhelper上使用void但是我遇到了错误，当我使用游标时它会崩溃。我不想使用持有人。这个助手有什么解决方案吗？非常感谢你提前
数据库助手类：
private DatabaseOpenHelper openHelper;
private SQLiteDatabase database;
public PersonDatabaseHelper(Context aContext) {
openHelper = new DatabaseOpenHelper(aContext);
database = openHelper.getWritableDatabase();
}
public void insertData (String bbi, String total, String liter, String asup) {
// we are using ContentValues to avoid sql format errors
ContentValues contentValues = new ContentValues();
contentValues.put(HASIL_COLUMN_BBI, bbi);
contentValues.put(HASIL_COLUMN_TOTAL, total);
contentValues.put(HASIL_COLUMN_LITER, liter);
contentValues.put(HASIL_COLUMN_ASUP, asup);
database.insert(TABLE_NAME, null, contentValues);
}
public Cursor getAllData () {
String buildSQL = "SELECT * FROM " + TABLE_NAME;
Log.d(TAG, "getAllData SQL: " + buildSQL);
return database.rawQuery(buildSQL, null);
}
public Cursor deleteRow(String id){
String buildSQL = "DELETE * FROM TABLE_NAME WHERE HASIL_COLUMN_ID"+"= ?"+id;
Log.d(TAG, "deleterRow SQL: " + buildSQL);
return database.rawQuery(buildSQL, null);
}
// this DatabaseOpenHelper class will actually be used to perform database related operation
public class DatabaseOpenHelper extends SQLiteOpenHelper {
public DatabaseOpenHelper(Context aContext) {
super(aContext, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
// Create your tables here
String buildSQL = "CREATE TABLE " + TABLE_NAME + "( " + HASIL_COLUMN_ID + " INTEGER PRIMARY KEY, " +
HASIL_COLUMN_BBI + " INTEGER, " + HASIL_COLUMN_TOTAL + " REAL, "+ HASIL_COLUMN_LITER+ " NUMERIC," + HASIL_COLUMN_ASUP+" INTEGER )";
Log.d(TAG, "onCreate SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL);
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion, int newVersion) {
// Database schema upgrade code goes here
String buildSQL = "DROP TABLE IF EXISTS " + TABLE_NAME;
Log.d(TAG, "onUpgrade SQL: " + buildSQL);
sqLiteDatabase.execSQL(buildSQL); // drop previous table
onCreate(sqLiteDatabase); // create the table from the beginning
}
}
public void delete_kontak(SQLiteDatabase sqLiteDatabase){
sqLiteDatabase.execSQL("DELETE * FROM TABLE_NAME WHERE HASIL_COLUMN_ID > -1");
}
}
ListView活动：
databaseHelper = new PersonDatabaseHelper(this);
delete = (ImageButton) findViewById (R.id.btn_hapus);
listView = (ListView) findViewById(R.id.list_data);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(TAG, "clicked on item: " + position);
}
});
new Handler().post(new Runnable() {
@Override
public void run() {
customAdapter = new CustomCursorAdapter(MenuHistory.this, databaseHelper.getAllData());
listView.setAdapter(customAdapter);
}
});
// this is the imagebutton "delete"
delete.setOnClickListener(new OnClickListener() {
public void onClick() {
customAdapter = new CustomCursorAdapter(MenuHistory.this, databaseHelper.deleteRow(null));
delete.setAdapter(customAdapter);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
}
public void onClickEnterData(View btnAdd) {
startActivityForResult(new Intent(this, EnterDataActivity.class), ENTER_DATA_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == ENTER_DATA_REQUEST_CODE && resultCode == RESULT_OK) {
databaseHelper.insertData(data.getExtras().getString("tag_Hasil_BBI"), data.getExtras().getString("tag_Hasil_Total")
, data.getExtras().getString("tag_Hasil_Liter"), data.getExtras().getString("tag_Jumlah_Asupan"));
customAdapter.changeCursor(databaseHelper.getAllData());
}
}
}