固特异给大家。
好吧，这就是问题所在，我想了解列表视图的逻辑，以及如何检索其中单击的项目的信息。
我已经完成并定制了一堆教程来做这个应用程序，现在我试图弄清楚我在这个丑陋和肮脏的代码中做了什么。
我有一个活动，它列出了一系列问题，在您选择一个类别后，选择一个问题，将您带到下一个活动，其中列出了一些答案，用户可以选择一个。我只想列出用户必须回答的那些问题，而不是全部，所以我在类别表中添加了一个名为“fatta”的新列 - 英文中的“done”，我想在何时更改为 1用户单击该问题的答案。
所以这个想法是传递问题的 id，所以在我列出所有答案的活动中，我可以更新答案和问题表，将“完成字段”设置为 1。
但出了点问题。这是代码：
活动：
public class sondaggioActivity extends ListActivity{
private static final String strdomanda = null;
private pollDataSource datasource;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maindomanda);
long domanda = getIntent().getExtras().getLong("domanda");
TextView text = (TextView) findViewById(R.id.domanda);
String strdomanda = Long.toString(domanda);
// text.setText(strcategory);
datasource = new pollDataSource(this);
datasource.open();
Cursor values = datasource.getTestoRisposte(strdomanda);
// data? if (values.moveToFirst())
// System.out.println(values.getString(values.getColumnIndex("sondid")));
String[] categorieColumns =
{
MySQLiteHelper.COLUMN_RISPOSTA // Contract class constant containing the word column name
};
int[] mWordListItems = { R.id.categoria_label };
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
getApplicationContext(), // The application's Context object
R.layout.single_list_item, // A layout in XML for one row in the ListView
values, // The result from the query
categorieColumns, // A string array of column names in the cursor
mWordListItems, // An integer array of view IDs in the row layout
0); // Flags (usually none are needed)
setListAdapter(adapter);
//values.close();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
datasource.setRispostaSelezionata(Long.toString(id));
datasource.setDomandaFatta(strdomanda);
datasource.close();
finish();
}
}
正如您在最后看到的那样onListItemClick，我使用strdomanda我在顶部定义private static final String strdomanda = null;的数据源是这样的：
public class pollDataSource {
// Database fields
private SQLiteDatabase database;
private MySQLiteHelper dbHelper;
private String[] allCategorieColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_PREF, MySQLiteHelper.COLUMN_NOME };
private String[] allSondaggiColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_CATID,MySQLiteHelper.COLUMN_WEBID,MySQLiteHelper.COLUMN_FATTA, MySQLiteHelper.COLUMN_DOMANDA };
private String[] allRisposteColumns = { MySQLiteHelper.COLUMN_ID,
MySQLiteHelper.COLUMN_SONDID,MySQLiteHelper.COLUMN_WEBID, MySQLiteHelper.COLUMN_RISPOSTA,
MySQLiteHelper.COLUMN_SELEZIONATA };
public pollDataSource(Context context) {
dbHelper = new MySQLiteHelper(context);
}
public void open() throws SQLException {
database = dbHelper.getWritableDatabase();
}
public void close() {
dbHelper.close();
}
public categorie createCategoria(String categoria) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_NOME, categoria);
values.put(MySQLiteHelper.COLUMN_PREF, 0);
long insertId = database.insert(MySQLiteHelper.TABLE_CATEGORIE, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_CATEGORIE,
allCategorieColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
categorie newCategoria = cursorToCategorie(cursor);
cursor.close();
return newCategoria;
}
public void deleteCategoria(categorie categoria) {
long id = categoria.getId();
System.out.println("Categoria cancellata, id: " + id);
database.delete(MySQLiteHelper.TABLE_CATEGORIE, MySQLiteHelper.COLUMN_ID
+ " = " + id, null);
}
public sondaggi createSondaggio(String domanda, int catid, int webid) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_DOMANDA, domanda);
values.put(MySQLiteHelper.COLUMN_CATID, catid);
values.put(MySQLiteHelper.COLUMN_WEBID, webid);
values.put(MySQLiteHelper.COLUMN_FATTA, "0");
long insertId = database.insert(MySQLiteHelper.TABLE_SONDAGGI, null,
values);
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns, MySQLiteHelper.COLUMN_ID + " = " + insertId, null,
null, null, null);
cursor.moveToFirst();
sondaggi newSondaggio = cursorToSondaggi(cursor);
cursor.close();
return newSondaggio;
}
public void deleteSondaggio(sondaggi sondaggio) {
long id = sondaggio.getId();
System.out.println("Sondaggio cancellato, id: " + id);
database.delete(MySQLiteHelper.TABLE_SONDAGGI, MySQLiteHelper.COLUMN_ID
+ " = " + id, null);
}
public Cursor getAllCategorie() {
List<categorie> categorie = new ArrayList<categorie>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_CATEGORIE,
allCategorieColumns, null, null, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
categorie categoria = cursorToCategorie(cursor);
categorie.add(categoria);
cursor.moveToNext();
}
// Make sure to close the cursor
// cursor.close();
return cursor;
}
public Cursor getDomanda(String id) {
List<sondaggi> domande = new ArrayList<sondaggi>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns,
MySQLiteHelper.COLUMN_ID + "=?",
new String[] { id }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
sondaggi sondaggio = cursorToSondaggi(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
private categorie cursorToCategorie(Cursor cursor) {
categorie categorie = new categorie();
categorie.setId(cursor.getLong(0));
categorie.setPreferita(cursor.getLong(1));
categorie.setNome(cursor.getString(2));
return categorie;
}
private sondaggi cursorToSondaggi(Cursor cursor) {
sondaggi sondaggi = new sondaggi();
sondaggi.setId(cursor.getLong(0));
sondaggi.setDomanda(cursor.getString(1));
sondaggi.setCatid(cursor.getLong(2));
sondaggi.setwebid(cursor.getLong(3));
return sondaggi;
}
public Cursor getAllDomandeCategoria(String catid) {
List<sondaggi> domande = new ArrayList<sondaggi>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_SONDAGGI,
allSondaggiColumns,
MySQLiteHelper.COLUMN_CATID + "=?",
new String[] { catid }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
sondaggi sondaggio = cursorToSondaggi(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
public Cursor getTestoRisposte(String strdomanda) {
List<testo_risposte> domande = new ArrayList<testo_risposte>();
Cursor cursor = database.query(MySQLiteHelper.TABLE_TESTORISPOSTE,
allRisposteColumns,
MySQLiteHelper.COLUMN_SONDID + "=?",
new String[] { strdomanda }, null, null, null);
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
testo_risposte sondaggio = cursorToTestoRisposte(cursor);
domande.add(sondaggio);
cursor.moveToNext();
}
return cursor;
}
private testo_risposte cursorToTestoRisposte(Cursor cursor) {
testo_risposte testo_risposte = new testo_risposte();
testo_risposte.setId(cursor.getLong(0));
testo_risposte.setCatid(cursor.getLong(1));
testo_risposte.setWebid(cursor.getLong(4));
testo_risposte.Setselezionata(cursor.getLong(2));
testo_risposte.setDomanda(cursor.getString(3));
return testo_risposte;
}
public void setRispostaSelezionata(String id) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_SELEZIONATA, "1");
database.update(MySQLiteHelper.TABLE_TESTORISPOSTE,values,MySQLiteHelper.COLUMN_ID + "=?", new String[] { id });
}
public void setDomandaFatta(String strdomanda) {
ContentValues values = new ContentValues();
values.put(MySQLiteHelper.COLUMN_FATTA, "1");
database.update(MySQLiteHelper.TABLE_SONDAGGI,values,MySQLiteHelper.COLUMN_ID + "=?", new String[] { strdomanda });
}
}
但是当我运行活动时，只有第一个更新很好，另一个，我想“停用”问题的那个......什么都不做......我想我通过 strdomanda 的方式不是好方法。有什么帮助吗？建议？提前致谢。