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我想要發生的是我將使用列表片段在列表視圖中顯示所有數據。我下載了一些源代碼並進行編輯以獲得我想要的輸出。繼承人我的代碼：當使用BaseAdapter子類時，ListView不顯示任何數據
List<ListSql> results = new ArrayList<ListSql>();
setListAdapter(new SqlParser(getActivity(),results));
，這是我listsql：
public class ListSql {
private String Fname;
private String Fpass;
private ArrayList<String> arList;
private Context myContext;
private List<ListSql> items;
private LayoutInflater mInflater;
private DBhelper myHelper;
private SQLiteDatabase myDbase;
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "_persons_name";
public static final String KEY_HOTNESS = "person_hotness";
private static final String DATABASE_NAME = "HotOrNotdb";
private static final String DATABASE_TABLE = "peopleTable";
private static final int DATABASE_VERSION = 1;
public static class DBhelper extends SQLiteOpenHelper{
public DBhelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(
"Create Table " + DATABASE_TABLE + " (" +
KEY_ROWID + " Integer PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " TEXT NOT NULL, " +
KEY_HOTNESS + " TEXT NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXIST " + DATABASE_TABLE);
onCreate(db);
}
}
public ListSql(Context context){
this.arList = Listme(arList);
this.myContext = context;
}
public String getName(){
return Fname;
}
public String getPass(){
return Fpass;
}
public ArrayList<String> getArr(){
return arList;
}
public ListSql open(){
myHelper = new DBhelper(myContext);
myDbase = myHelper.getWritableDatabase();
Log.i("open","open");
return this;
}
public void close(){
myHelper.close();
}
public ArrayList<String> Listme(ArrayList<String> arr){
String sql = "select * from " + DATABASE_TABLE;
Cursor c = myDbase.rawQuery(sql, null);
if(c !=null){
if (c.moveToFirst()) {
do {
String firstName = c.getString(c.getColumnIndex(KEY_NAME));
String pass = c.getString(c.getColumnIndex(KEY_HOTNESS));
arr.add("username " + firstName + ", Password: " + pass);
}while (c.moveToNext());
}
Log.i("hahahaha","hehe");
return arr;
}
Log.i("hahahaha","not here");
return null;
}
}
和我baseadapter：
public class SqlParser extends BaseAdapter {
private Context myContext;
private List<ListSql> items;
private LayoutInflater mInflater;
private DBhelper myHelper;
private SQLiteDatabase myDbase;
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "_persons_name";
public static final String KEY_HOTNESS = "person_hotness";
private static final String DATABASE_NAME = "HotOrNotdb";
private static final String DATABASE_TABLE = "peopleTable";
private static final int DATABASE_VERSION = 1;
public SqlParser(Context context ,List<ListSql> items){
this.myContext = context;
this.items = items;
}
private class ViewHolder {
public TextView textView;
}
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ArrayList<String> arr = new ArrayList<String>();
View view = convertView;
ViewHolder viewHolder;
TextView namef ;
ImageView prof;
Bitmap bMap;
if (view == null) {
view = mInflater.inflate(R.layout.listinflate, parent, false);
/**
viewHolder = new ViewHolder();
viewHolder.textView = (TextView) view.findViewById(R.id.textView1);
view.setTag(viewHolder); **/
/*** You can do this manualy without using holder ***/
namef = (TextView)view.findViewById(R.id.textView1);
/*** You can do this manualy on setting the tag to individual components rather than using holder ***/
view.setTag(namef);
}else {
viewHolder = (ViewHolder) view.getTag();
namef = (TextView) view.getTag();
}
namef.setText(items.get(position).Listme(arr).get(position).toString());
return view;
}
}
所以，問題是：我的列表視圖犯規顯示任何數據。即時通訊相當肯定，我從sqlite檢索數據，但我不能管理它顯示在我的列表視圖..
你爲什麼不使用ArrayAdapter或SimpleCursorAdapter？ – Ran
@millimoose ..我明白代碼。它適用於靜態變量。但在獲取數據庫的價值和顯示它。它不工作。我只是一個初學者而不是專業人士。 – nelzkie
@Ran因爲我在互聯網上看到的大多數代碼都使用基礎適配器。 – nelzkie