我一直在开发一个使用数据库填充列表的 Android 应用程序。该数据库由位于 /assets 文件夹中的 .csv 文件中的记录填充。几分钟前一切正常，但自从我刷新了我的 CSV 后，不再显示包含数据的列表（它只是说“没有要显示的订单”，这意味着它没有找到任何数据填充列表）。此外，代码不会产生任何错误，而且 LogCat 对我来说并没有真正的用处。
我想知道是否有人可以帮助我：谢谢你！
这是 DatabaseActivity.java 文件：
public class DatabaseActivity extends ListActivity {
String ID;
String title;
String location;
String startTime;
String endTime;
String date;
String description;
private DatabaseHelper dbh;
private ProgressDialog m_ProgressDialog = null;
private ArrayList<Order> m_orders = null;
private OrderAdapter m_adapter;
private Runnable viewOrders;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.dbh = new DatabaseHelper(this);
try {
csvtodb();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
m_orders = new ArrayList<Order>();
this.m_adapter = new OrderAdapter(this, R.layout.row, m_orders);
setListAdapter(this.m_adapter);
viewOrders = new Runnable(){
@Override
public void run() {
getOrders();
}
};
Thread thread = new Thread(null, viewOrders, "MagentoBackground");
thread.start();
m_ProgressDialog = ProgressDialog.show(DatabaseActivity.this,
"Even geduld...", "Database wordt geladen...", true);
}
private Runnable returnRes = new Runnable() {
@Override
public void run() {
if(m_orders != null && m_orders.size() > 0){
m_adapter.notifyDataSetChanged();
for(int i=0;i<m_orders.size();i++)
m_adapter.add(m_orders.get(i));
}
m_ProgressDialog.dismiss();
m_adapter.notifyDataSetChanged();
}
};
private void getOrders(){
try{
m_orders = new ArrayList<Order>();
SQLiteDatabase db = dbh.getReadableDatabase();
Cursor c = db.query(DatabaseHelper.tblEvents,
new String[] {DatabaseHelper.title,
DatabaseHelper.location,
DatabaseHelper.startTime,
DatabaseHelper.description},
null, null, null, null,
DatabaseHelper.startTime + " ASC");
int numberOfRows = c.getCount();
for (int i = 0; i < numberOfRows; i++){
c.moveToPosition(i);
// Obtain the title
int col1 = c.getColumnIndex(DatabaseHelper.title);
String title = c.getString(col1);
// Obtain the location
int col2 = c.getColumnIndex(DatabaseHelper.location);
String location = c.getString(col2);
// Obtain the time
int col3 = c.getColumnIndex(DatabaseHelper.startTime);
String startTime = c.getString(col3);
// Obtain the description
int col4 = c.getColumnIndex(DatabaseHelper.description);
String description = c.getString(col4);
Order o = new Order();
o.setOrderTime(startTime);
o.setOrderTitle(title);
o.setOrderLocation(location);
o.setOrderDescription(description);
m_orders.add(o);
}
db.close();
Thread.sleep(2000);
Log.i("ARRAY", ""+ m_orders.size());
} catch (Exception e) {
Log.e("BACKGROUND_PROC", e.getMessage());
}
runOnUiThread(returnRes);
}
public void csvtodb() throws IOException {
// Get a writable database
SQLiteDatabase db = dbh.getWritableDatabase();
if (dbh.isDbInitialized(db)) {
db.close();
return;
}
AssetManager assetManager = getAssets();
InputStream input = assetManager.open("testcsv.csv");
BufferedReader in = new BufferedReader(new InputStreamReader(input, "UTF-8"));
String reader = "";
while ((reader = in.readLine()) != null)
{
String[] RowData = reader.split(",");
ID = RowData[0];
title = RowData[1];
location = RowData[2];
startTime = RowData[3];
endTime = RowData[4];
date = RowData[5];
description = RowData[6];
DatabaseHelper.fillTable(db, ID, title, location, startTime, endTime, date, description);
}
in.close();
}
public class OrderAdapter extends ArrayAdapter<Order> {
private ArrayList<Order> items;
public OrderAdapter(Context context, int textViewResourceId, ArrayList<Order> items) {
super(context, textViewResourceId, items);
this.items = items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
Order o = items.get(position);
if (o != null) {
TextView time = (TextView) v.findViewById(R.id.time);
TextView title = (TextView) v.findViewById(R.id.title);
TextView location = (TextView) v.findViewById(R.id.location);
TextView description = (TextView) v.findViewById(R.id.description);
if (time != null) {
time.setText(o.getOrderTime());
}
if(title != null){
title.setText(o.getOrderTitle());
}
if(location != null){
location.setText("Locatie: " + o.getOrderLocation());
}
if(description != null){
description.setText(o.getOrderDescription());
}
}
return v;
}
}
}
这是 DatabaseHelper.java：
public class DatabaseHelper extends SQLiteOpenHelper{
// Database name and version
static final String dbName = "Evenementen";
static final int dbVersion = 1;
// Names of tables and columns
static final String tblEvents = "Evenementen";
static final String eventID = "ID";
static final String title = "Titel";
static final String location = "Locatie";
static final String startTime = "Begintijd";
static final String endTime = "Eindtijd";
static final String date = "Datum";
static final String description = "Beschrijving";
// Constructor
public DatabaseHelper(Context context) {
super(context, dbName, null, dbVersion);
}
@Override
public void onCreate(SQLiteDatabase db) {
createDB(db);
}
public void createDB(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + tblEvents + " (" +
eventID + " INTEGER PRIMARY KEY, " +
title + " TEXT , " +
location + " TEXT , " +
startTime + " TEXT , " +
endTime + " TEXT , " +
date + " TEXT , " +
description + " TEXT" +
")");
}
public boolean isDbInitialized(SQLiteDatabase db) {
return db.rawQuery("SELECT DISTINCT tbl_name FROM sqlite_master WHERE tbl_name = '"+ tblEvents + "'", null) != null;
}
public static void fillTable(SQLiteDatabase db, String first, String second, String third,
String fourth, String fifth, String sixth, String seventh) {
String template = "INSERT INTO " + tblEvents +
"(" + eventID + "," + title + "," + location + "," + startTime + "," + endTime + "," + date + "," + description + ")" +
"VALUES (?,?,?,?,?,?,?)";
Object[] args = new Object[]{first, second, third, fourth, fifth, sixth, seventh};
db.execSQL(template, args);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Bluntly remove table (and thus discard ALL data in it!) if we're upgrading
db.execSQL("DROP TABLE IF EXISTS " + tblEvents);
onCreate(db);
}
}
这是我的 CSV 文件（它是荷兰语。值用逗号分隔）：
1,Cross Rubicon,van der Werff & Studio de Veste,15:00,Nvt,03-okt,Geen beschrijving beschikbaar
2,Ferry Nick & Lodewijk Band,van der Werff & Studio de Veste,18:30,Nvt,03-okt,Bekend van de Edwin Evers Band & Marco Borsato
3,LOS,van der Werff & Studio de Veste,21:00,Nvt,03-okt,Nederpopcovers
4,La Cubaniza,Scheltema,16:00,Nvt,03-okt,Cuban liveband & DJ
仅供参考：我正在使用此参考在列表中显示我的数据库中的数据。