我有一些问题。当我从listview baseAdapter中单击删除（interestAdepter类中的btnPlus.setOnClickListener）按钮时，我想刷新包含listview的片段。
1.InterestAdapter class {edtied}
public class InterestAdapter extends BaseAdapter{
private ArrayList<InterestClass> m_List;
public InterestAdapter() {
m_List = new ArrayList<InterestClass>();
}
@Override
public int getCount() {
return m_List.size();
}
@Override
public Object getItem(int position) {
return m_List.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final int pos = position;
final Context context = parent.getContext();
TextView textName = null;
TextView textDate = null;
TextView textConPrice = null;
TextView textNowPrice = null;
TextView textFog = null;
ImageButton btnPlus = null;
CustomHolder holder = null;
if ( convertView == null ) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.item_interest, parent, false);
textName = (TextView) convertView.findViewById(R.id.i_ProdNmae);
textDate = (TextView) convertView.findViewById(R.id.i_Date);
textConPrice = (TextView) convertView.findViewById(R.id.i_InterPrice);
textNowPrice = (TextView) convertView.findViewById(R.id.i_currentPrice);
textFog = (TextView) convertView.findViewById(R.id.i_Analysis);
btnPlus = (ImageButton) convertView.findViewById(R.id.i_addBtn);
holder = new CustomHolder();
holder.i_TextView = textName;
holder.i_TextView1 = textDate;
holder.i_TextView2 = textConPrice;
holder.i_TextView3 = textNowPrice;
holder.i_TextView4 = textFog;
holder.i_Btn = btnPlus;
convertView.setTag(holder);
}
else {
holder = (CustomHolder) convertView.getTag();
textName = holder.i_TextView;
textDate = holder.i_TextView1;
textConPrice = holder.i_TextView2;
textNowPrice = holder.i_TextView3;
textFog = holder.i_TextView4;
btnPlus = holder.i_Btn;
}
/*if(position == 0) {
textName.setText("종목");
textDate.setText("관심일");
textConPrice.setText("관심가");
textNowPrice.setText("현재가");
textFog.setText("수급");
btnPlus.setEnabled(false);
}else{
}*/
textName.setText(m_List.get(position).getName());
textDate.setText(m_List.get(position).getDate());
textConPrice.setText(m_List.get(position).getConPrice());
textNowPrice.setText(m_List.get(position).getNowPrice());
textFog.setText(m_List.get(position).getFog());
btnPlus.setEnabled(true);
textName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context,DetailActivity.class);
context.startActivity(intent);
}
});
btnPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Crypto enc = new Crypto();
SharedPreferences pref = context.getSharedPreferences("com.rabiaband.pref", 0);
String[] add_Params = new String[2];
try {
add_Params[0] = enc.AES_Encode(pref.getString("no", null), enc.global_deckey);
add_Params[1] = enc.AES_Encode(m_List.get(pos).getJmcode(), enc.global_deckey);
} catch (Exception e) {
Log.e("HomeCryptographError:", "" + e.getMessage());
}
AsyncCallAddDelFavorite delFavorite = new AsyncCallAddDelFavorite();
delFavorite.execute(add_Params);
}
});
private class AsyncCallAddDelFavorite extends AsyncTask<String, Void, Void> {
JSONObject del_Favorite_List;
/* public AsyncCallAddFavorite(HomeFragment home){
this.home=home;
}*/
@Override
protected void onPreExecute() {
/*Log.i(TAG, "onPreExecute");*/
}
@Override
protected Void doInBackground(String... params) {
dbConnection db_Cont=new dbConnection();
String id=params[0];
String jmcode=params[1];
Log.v("doinbackgroud",""+id+"ssssss"+jmcode);
del_Favorite_List=db_Cont.delFavorite(id, jmcode);
Log.v("doinbackgroud",del_Favorite_List.toString());
return null;
}
@Override
protected void onPostExecute(Void result) {
/*Log.i(TAG, "onPostExecute");*/
}
}
}
2.InterestFragment {编辑}
public class InterestFragment extends Fragment {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
private ListView interest_ListView;
private InterestAdapter interest_Adapter;
String TAG="response";
RbPreference keep_Login;
public InterestFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment InterestFragment.
*/
// TODO: Rename and change types and number of parameters
public static InterestFragment newInstance(String param1, String param2) {
InterestFragment fragment = new InterestFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
keep_Login = new RbPreference(getContext());
Log.v("interFrag","oncreate");
// Inflate the layout for this fragment
/*if(keep_Login.get("name",null)!=null) {
return inflater.inflate(R.layout.fragment_interest, container, false);
}else{
return inflater.inflate(R.layout.need_login, container, false);
}*/
return inflater.inflate(R.layout.fragment_interest, container, false);
}
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.v("ListFragment", "onActivityCreated().");
Log.v("ListsavedInstanceState", savedInstanceState == null ? "true" : "false");
if(keep_Login.get("no",null)!=null) {
String enc_Id="";
Crypto enc=new Crypto();
try{
enc_Id=enc.AES_Encode(keep_Login.get("no",null),enc.global_deckey);
}catch(Exception e){
}
interest_Adapter = new InterestAdapter();
interest_ListView = (ListView) getView().findViewById(R.id.i_ListView);
AsyncCallInterest task = new AsyncCallInterest();
task.execute(enc_Id);
}
}
private class AsyncCallInterest extends AsyncTask<String, Void, JSONArray> {
JSONArray interest_Array;
InterestFragment interest;
@Override
protected void onPreExecute() {
Log.i(TAG, "onPreExecute");
}
@Override
protected JSONArray doInBackground(String... params) {
String id=params[0];
dbConnection db_Cont=new dbConnection();
interest_Array=db_Cont.getFavorite(id);
Log.v("doinbackgroud", interest_Array.toString());
return interest_Array;
}
@Override
protected void onPostExecute(JSONArray result) {
try{
for (int i = 0 ; i < result.length() ; i ++){
InterestClass i_Class = new InterestClass();
String date=result.getJSONObject(i).getString("indate");
String time=date.substring(5,date.length());
i_Class.setJmcode(result.getJSONObject(i).getString("jmcode"));
i_Class.setName(result.getJSONObject(i).getString("jmname"));
i_Class.setDate(time);
i_Class.setConPrice(result.getJSONObject(i).getString("fprice"));
i_Class.setNowPrice(result.getJSONObject(i).getString("price"));
i_Class.setFog("40");
i_Class.setPlus(true);
interest_Adapter.add(i_Class);
}
interest_ListView.setAdapter(interest_Adapter);
}catch(Exception e){
Toast.makeText(getActivity(), "interest"+e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}
}
有没有办法从baseAdapter类中的按钮刷新片段？我搜索了很多，但我不能回答。请帮帮我，谢谢。 {}编辑 我添加了AsyncCallAddDelFavorite类和AsyncCallInterest类。谢谢。
答案 0 :(得分：0)
如果我理解正确您想要从数据库中删除该项目之后从ListView删除该项目，那么您可以将其称为
m_List.remove(position);
interest_Adapter..notifyDataSetChanged();
第一行删除该项目，第二行将确保在删除该项目后适配器更新。
希望这有帮助
答案 1 :(得分：0)
更新适配器构造函数。删除内容后，从arraylist中删除该项目并通知更改的数据集。
public class InterestAdapter extends BaseAdapter{
private ArrayList<InterestClass> m_List;
private Context mContext;
public InterestAdapter(Context context, ArrayList<InterestClass> list) {
m_List = list;
mContext = context;
}
@Override
public int getCount() {
return m_List.size();
}
@Override
public Object getItem(int position) {
return m_List.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final int pos = position;
final Context context = parent.getContext();
TextView textName = null;
TextView textDate = null;
TextView textConPrice = null;
TextView textNowPrice = null;
TextView textFog = null;
ImageButton btnPlus = null;
CustomHolder holder = null;
if ( convertView == null ) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.item_interest, parent, false);
textName = (TextView) convertView.findViewById(R.id.i_ProdNmae);
textDate = (TextView) convertView.findViewById(R.id.i_Date);
textConPrice = (TextView) convertView.findViewById(R.id.i_InterPrice);
textNowPrice = (TextView) convertView.findViewById(R.id.i_currentPrice);
textFog = (TextView) convertView.findViewById(R.id.i_Analysis);
btnPlus = (ImageButton) convertView.findViewById(R.id.i_addBtn);
holder = new CustomHolder();
holder.i_TextView = textName;
holder.i_TextView1 = textDate;
holder.i_TextView2 = textConPrice;
holder.i_TextView3 = textNowPrice;
holder.i_TextView4 = textFog;
holder.i_Btn = btnPlus;
convertView.setTag(holder);
}
else {
holder = (CustomHolder) convertView.getTag();
textName = holder.i_TextView;
textDate = holder.i_TextView1;
textConPrice = holder.i_TextView2;
textNowPrice = holder.i_TextView3;
textFog = holder.i_TextView4;
btnPlus = holder.i_Btn;
}
/*if(position == 0) {
textName.setText("종목");
textDate.setText("관심일");
textConPrice.setText("관심가");
textNowPrice.setText("현재가");
textFog.setText("수급");
btnPlus.setEnabled(false);
}else{
}*/
textName.setText(m_List.get(position).getName());
textDate.setText(m_List.get(position).getDate());
textConPrice.setText(m_List.get(position).getConPrice());
textNowPrice.setText(m_List.get(position).getNowPrice());
textFog.setText(m_List.get(position).getFog());
btnPlus.setEnabled(true);
textName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context,DetailActivity.class);
context.startActivity(intent);
}
});
btnPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Crypto enc = new Crypto();
SharedPreferences pref = context.getSharedPreferences("com.rabiaband.pref", 0);
String[] add_Params = new String[2];
try {
add_Params[0] = enc.AES_Encode(pref.getString("no", null), enc.global_deckey);
add_Params[1] = enc.AES_Encode(m_List.get(pos).getJmcode(), enc.global_deckey);
} catch (Exception e) {
Log.e("HomeCryptographError:", "" + e.getMessage());
}
AsyncCallAddDelFavorite delFavorite = new AsyncCallAddDelFavorite();
delFavorite.execute(add_Params);
**m_List.remove(position);
notifyDatasetChanged();**
}
});
private class AsyncCallAddDelFavorite extends AsyncTask<String, Void, Void> {
JSONObject del_Favorite_List;
/* public AsyncCallAddFavorite(HomeFragment home){
this.home=home;
}*/
@Override
protected void onPreExecute() {
/*Log.i(TAG, "onPreExecute");*/
}
@Override
protected Void doInBackground(String... params) {
dbConnection db_Cont=new dbConnection();
String id=params[0];
String jmcode=params[1];
Log.v("doinbackgroud",""+id+"ssssss"+jmcode);
del_Favorite_List=db_Cont.delFavorite(id, jmcode);
Log.v("doinbackgroud",del_Favorite_List.toString());
return null;
}
@Override
protected void onPostExecute(Void result) {
/*Log.i(TAG, "onPostExecute");*/
}
}
}
更新片段中的适配器初始化。您正在直接向适配器添加项目。使用arraylist并在下载数据后创建适配器实例。
private ArrayList<InterestClass> interestList = new ArrayList<>();
并更新你的onPostExecute方法
@Override
protected void onPostExecute(JSONArray result) {
try{
for (int i = 0 ; i < result.length() ; i ++){
InterestClass i_Class = new InterestClass();
String date=result.getJSONObject(i).getString("indate");
String time=date.substring(5,date.length());
i_Class.setJmcode(result.getJSONObject(i).getString("jmcode"));
i_Class.setName(result.getJSONObject(i).getString("jmname"));
i_Class.setDate(time);
i_Class.setConPrice(result.getJSONObject(i).getString("fprice"));
i_Class.setNowPrice(result.getJSONObject(i).getString("price"));
i_Class.setFog("40");
i_Class.setPlus(true);
interestList.add(i_Class);
}
interest_Adapter = new InterestAdapter(getActivity,interestList);
interest_ListView.setAdapter(interest_Adapter);
}catch(Exception e){
Toast.makeText(getActivity(), "interest"+e.getMessage(), Toast.LENGTH_SHORT).show();
}
}