我想開發一個可以顯示多個表中的值的android應用程序。值不填充在列表視圖
我已經使用Base Adapter來顯示值,因爲我只需要在列表中顯示查詢的值。但是當我嘗試在列表視圖中顯示值時,它是空白的。
我不知道我做錯了什麼。
我使用下面的方法來查詢數據庫中的數據,只顯示所需的值。
public Cursor getAssetInStore()
{
SQLiteDatabase db_database = getReadableDatabase();
Cursor c = db_database.rawQuery("SELECT asset_name,warrenty,AssetImage,asset_status FROM `Assets`,`AseetIssued` WHERE Assets.Assetid = AseetIssued.Assetissuedid AND asset_status =?" ,
new String [] {"In Storage"}, null);
return c;
}
以下方法用於將值填充到列表視圖中。
private void populateAssetListView()
{
Cursor c = db_database.getAssetInStore();
AssetListView.setAdapter(new AssetListAdapter(this, c));
}
public class AssetListAdapter extends BaseAdapter
{
private Context mContext;
Cursor cursor;
public AssetListAdapter(Context context, Cursor c) {
super();
mContext = context;
cursor =c ;
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//The layout is assigned to the custome created created in this case it is customeassetview the cales will be displayed as per this list
view = inflater.inflate(R.layout.assetsinstore_placeholder, null);
cursor.moveToPosition(position);
TextView Assetsstatus = (TextView) view.findViewById(R.id.Assetssatutsstore_view);
int status = cursor.getInt(cursor.getColumnIndex("asset_status"));
Assetsstatus .setText(String.valueOf(status));
TextView Assetsname = (TextView) view.findViewById(R.id.Assetstore_name_view);
String Assetname = cursor.getString(cursor.getColumnIndex("asset_name"));
Assetsname.setText(Assetname);
TextView Warrenty = (TextView) view.findViewById(R.id.Assetstore_Warrenty_view);
String CustDesignation = cursor.getString(cursor.getColumnIndex("warrenty"));
Warrenty .setText(CustDesignation);
ImageView AssetImage = (ImageView) view.findViewById(R.id.list_image);
byte[] bb = cursor.getBlob(cursor.getColumnIndex("AssetImage"));
AssetImage.setImageBitmap(BitmapConver.getPhoto(bb));
return view;
}
}
'getCount'必須返回數據集的大小。它不能返回0 – Blackbelt