如何从android中的ListView中删除项目并且notifyDataSetChanged（）不起作用

时间：2017-10-17 05:34:48

标签： android

我为ListView中的删除项实现了一个代码。下面是我使用notifyDataSetChanged（）的代码，但是当我使用context.recreate（）函数然后所有页面再次加载并且项目被删除时，列表没有刷新并且项目在点击删除按钮上。

 public class Shortlisted_custom  extends ArrayAdapter<String> {

private static final String deleteURL = "http://192.168.2.110/xp/ajax_call.php?action=remove_shortlisted";
private static final String url1 = "http://192.168.2.110/xp/express_intrest.php";
private static final String KEY_MATRI_ID_TO="matriID_to";
private static final String KEY_MATRI_ID_BY="matriID_by";

int pos;

SessionManager session;
public String matri_id_to, matri_id_by, str_gender,strEI;
int selectedPosition;

Button btnremove,btnChat,declineButton;

private NetworkImageView imageView;
private ImageLoader imageLoader;
private String[] ids;
private String[] ages;
private String[] heights;
public String[] communities;
public String[] castes;
public String[] educations;
public String[] occupations;
public String[] incomes;
public String[] pics;
public String[] locations;
public String[] status;
public String[] expressinterest;

private Activity context;

public Shortlisted_custom(Activity context, String[] ids, String[] ages, String[] heights, String[] communities, String[] castes, String[] educations, String[] occupations, String[]incomes, String[]pics, String[] locations,String[] status, String[] expressinterest) {
    super(context, R.layout.custom_shortlist,ids);
    this.context = context;
    this.ids = ids;
    this.ages = ages;
    this.heights = heights;
    this.communities = communities;
    this.castes = castes;
    this.educations = educations;
    this.occupations = occupations;
    this.incomes = incomes;
    this.pics = pics;
    this.locations = locations;
    this.status = status;
    this.expressinterest = expressinterest;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    pos = position;
    LayoutInflater inflater = context.getLayoutInflater();
    final View listViewItem = inflater.inflate(R.layout.custom_shortlist, null, true);
    // Session class instance
    session = new SessionManager(getContext());
    session.checkLogin();
    // get user data from session
    HashMap<String, String> user = session.getUserDetails();

    matri_id_by = user.get(SessionManager.KEY_EMAIL);
    str_gender = user.get(SessionManager.KEY_GENDER);

    String url1 = "https://www.maangal.com/thumb/thumb_";
    String url =url1+pics[position];

    btnremove =(Button) listViewItem.findViewById(R.id.btnRemove);
    btnChat =(Button) listViewItem.findViewById(R.id.VPButton);
    declineButton = (Button)listViewItem.findViewById(R.id.btnEI);
    imageView = (NetworkImageView) listViewItem.findViewById(R.id.offer_image);
    TextView textViewId = (TextView) listViewItem.findViewById(R.id.textViewId);
    TextView textViewName = (TextView) listViewItem.findViewById(R.id.textViewName);
    textViewId.setText(ids[position]);

    if(ages[position].equalsIgnoreCase("null") || status[position].equalsIgnoreCase("deleted")) {
        textViewName.setText("This profile has been Deleted");
        textViewName.setTextColor(Color.RED);
        imageView.setVisibility(View.GONE);
        btnremove.setVisibility(View.GONE);
        btnChat.setVisibility(View.GONE);
        declineButton.setVisibility(View.GONE);
    }
    else {
        imageLoader = CustomVolleyRequest.getInstance(this.getContext()).getImageLoader();
        if (str_gender.equalsIgnoreCase("Male")) {
            imageLoader.get(url, ImageLoader.getImageListener(imageView, R.drawable.image, R.drawable.girl));
        } else {
            imageLoader.get(url, ImageLoader.getImageListener(imageView, R.drawable.image, R.drawable.boy));
        }
        imageView.setImageUrl(url, imageLoader);
        textViewName.setText(ages[position] + " years" + " , " + heights[position] + " cm" + ", " + communities[position] + " : " + castes[position] + " , " + educations[position] + " , " + occupations[position] + " , " + incomes[position] + ", " + locations[position]);
        imageView.setVisibility(View.VISIBLE);
        btnremove.setVisibility(View.VISIBLE);
        btnChat.setVisibility(View.VISIBLE);
        declineButton.setVisibility(View.VISIBLE);
    }

删除按钮onClickListener 

    btnremove.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            matri_id_to=ids[position];
            selectedPosition = position;
            delete();
            Shortlisted_custom.this.notifyDataSetChanged();
          //  context.recreate();
        }
    });


    btnChat.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(v.getContext(),BlankActivity.class);
            Log.e("Id*******------------",ids[position].toString());
            i.putExtra("ID", ids[position]);
            i.putExtra("gender",str_gender);
            i.putExtra("current_ID",matri_id_by);
            v.getContext().startActivity(i);
        }
    });


    strEI = expressinterest[position];
    Log.e("EI-------------->", strEI.toString());
    if(strEI.toString().equalsIgnoreCase("Accepted")) {
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    }
    else if(strEI.toString().equalsIgnoreCase("Reject")){
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    }
    else if(strEI.toString().equalsIgnoreCase("Declined")){
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    }
    else if(strEI.toString().equalsIgnoreCase("Pending..")){
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    }
    else
    {
        declineButton.setText(strEI);
    }


    declineButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            matri_id_to=ids[position];
            selectedPosition = position;
            express_Intrest();
        }
    });
    return listViewItem;
}

public void express_Intrest(){
    StringRequest stringRequest1 = new StringRequest(Request.Method.POST, url1, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            if(response.trim().equalsIgnoreCase("success")) {
                expressinterest[selectedPosition] = "Pending..";
            }
        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(getContext(), error.toString(), Toast.LENGTH_LONG).show();
                }
            }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put(KEY_MATRI_ID_BY,matri_id_by);
            params.put(KEY_MATRI_ID_TO,matri_id_to);
            return params;
        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(getContext());
    requestQueue.add(stringRequest1);
}

 public void delete(){
    StringRequest stringRequest1 = new StringRequest(Request.Method.POST, deleteURL, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            if(response.trim().equalsIgnoreCase("success")) {
                Log.e("Remove_____________",matri_id_to);
            }
        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(getContext(), error.toString(), Toast.LENGTH_LONG).show();
                }
            }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put(KEY_MATRI_ID_BY,matri_id_by);
            params.put(KEY_MATRI_ID_TO,matri_id_to);
            return params;
        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(getContext());
    requestQueue.add(stringRequest1);
}

片段

public class ShortlistTab extends Fragment {
// Session Manager Class
SessionManager session;
String email;
public String JSON_URL;
private ListView listView;
public ShortlistTab() {}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Session class instance
    session = new SessionManager(getActivity());
    // get user data from session
    HashMap<String, String> user = session.getUserDetails();
    email = user.get(SessionManager.KEY_EMAIL);
    JSON_URL = "http://192.168.2.110/xp/shortlistedTab.php?matri_id="+email;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view= inflater.inflate(R.layout.matches_tab, container, false);
    listView = (ListView) view.findViewById(R.id.listView);
    sendRequest();
    return view;
}

private void sendRequest(){

    final ProgressDialog loading = ProgressDialog.show(getActivity(),"Loading Data", "Please wait...",false,false);

    StringRequest stringRequest = new StringRequest(Request.Method.POST,JSON_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    loading.dismiss();
                    Log.e("ShortlistedTab--------",response.trim());
                    showJSON(response);
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                    Toast.makeText(getContext(),error.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
    int MY_SOCKET_TIMEOUT_MS = 30000;
    stringRequest.setRetryPolicy(new DefaultRetryPolicy(
            MY_SOCKET_TIMEOUT_MS, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

    RequestQueue requestQueue = Volley.newRequestQueue(getContext());
    requestQueue.add(stringRequest);
}

protected void showJSON(String json){
    ShortlistMeParseJSON pj = new ShortlistMeParseJSON(json);
    pj.parseJSON();
    Shortlisted_custom cl = new Shortlisted_custom(getActivity(), 
    ShortlistMeParseJSON.ids,ShortlistMeParseJSON.ages, 
    ShortlistMeParseJSON.heights, 
    ShortlistMeParseJSON.communities,ShortlistMeParseJSON.castes,
    ShortlistMeParseJSON.educations,ShortlistMeParseJSON.occupations,
    ShortlistMeParseJSON.incomes,ShortlistMeParseJSON.pics,
    ShortlistMeParseJSON.locations,ShortlistMeParseJSON.status,
    ShortlistMeParseJSON.expressinterest);
    listView.setAdapter(cl);
  }
 }

2 个答案:

答案 0 :(得分：1)

使用此适配器类为您的入围数据创建一个自定义模型，还删除了一些全局变量请看看

public class Shortlisted_custom extends BaseAdapter {
private static final String deleteURL = "http://192.168.2.110/xp/ajax_call.php?action=remove_shortlisted";
private static final String url1 = "http://192.168.2.110/xp/express_intrest.php";
private static final String KEY_MATRI_ID_TO = "matriID_to";
private static final String KEY_MATRI_ID_BY = "matriID_by";

public String matri_id_by, str_gender;

Button btnremove, btnChat, declineButton;

TextView textViewId,tvAgeHeight,tvCommunity,tvOccupation,tvIncome,tvShortlistedOn,AgeHeight,Community,Occupation,Income,ShortlistedOn;

private NetworkImageView imageView;
private ImageLoader imageLoader;

private ArrayList<ShortListedModel> shortListedModels;

private Activity context;

public Shortlisted_custom(Activity context, String[] ids, String[] ages, String[] heights, String[] communities, String[] castes, String[] educations, String[] occupations, String[] incomes, String[] pics, String[] locations, String[] status, String[] expressinterest, String[] shortlistedOn) {
    this.context = context;

    // Session class instance
    SessionManager session = new SessionManager(context);
    session.checkLogin();
    // get user data from session
    HashMap<String, String> user = session.getUserDetails();

    matri_id_by = user.get(SessionManager.KEY_EMAIL);
    str_gender = user.get(SessionManager.KEY_GENDER);


    shortListedModels = new ArrayList<>();
    for (int i = 0; i < ids.length; i++) {
        ShortListedModel model = new ShortListedModel(ids[i], ages[i], heights[i], communities[i],
                castes[i], educations[i], occupations[i], incomes[i], pics[i],
                locations[i], status[i], expressinterest[i], shortlistedOn[i]);
        shortListedModels.add(model);
    }
}

@Override
public int getCount() {
    return shortListedModels.size();
}

@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();
    final View listViewItem = inflater.inflate(R.layout.custom_shortlist, null, true);

    String url1 = "https://www.maangal.com/thumb/thumb_";
    String url = url1 + shortListedModels.get(position).pic;

    btnremove = (Button) listViewItem.findViewById(R.id.btnRemove);
    btnChat = (Button) listViewItem.findViewById(R.id.VPButton);
    declineButton = (Button) listViewItem.findViewById(R.id.btnEI);
    imageView = (NetworkImageView) listViewItem.findViewById(R.id.offer_image);

    textViewId = (TextView) listViewItem.findViewById(R.id.textViewId);
    tvAgeHeight = (TextView) listViewItem.findViewById(R.id.tvAgeHeight);
    tvCommunity = (TextView) listViewItem.findViewById(R.id.tvCommunity);
    tvOccupation = (TextView) listViewItem.findViewById(R.id.tvOccupation);
    tvIncome = (TextView) listViewItem.findViewById(R.id.tvIncome);
    tvShortlistedOn = (TextView) listViewItem.findViewById(R.id.tvShortlistedOn);
    AgeHeight = (TextView) listViewItem.findViewById(R.id.AgeHeight);
    Community = (TextView) listViewItem.findViewById(R.id.Community);
    Occupation = (TextView) listViewItem.findViewById(R.id.Occupation);
    Income = (TextView) listViewItem.findViewById(R.id.Income);
    ShortlistedOn = (TextView) listViewItem.findViewById(R.id.ShortlistedOn);
    textViewId.setText(ids[position]);

    if (shortListedModels.get(position).age.equalsIgnoreCase("null") || shortListedModels.get(position).status.equalsIgnoreCase("deleted")) {
        tvAgeHeight.setText("This profile has been Deleted");
        tvAgeHeight.setTextColor(Color.RED);
        tvCommunity.setVisibility(View.GONE);
        tvOccupation.setVisibility(View.GONE);
        tvIncome.setVisibility(View.GONE);
        tvShortlistedOn.setVisibility(View.GONE);
        AgeHeight.setVisibility(View.GONE);
        Community.setVisibility(View.GONE);
        Occupation.setVisibility(View.GONE);
        Income.setVisibility(View.GONE);
        ShortlistedOn.setVisibility(View.GONE);
        imageView.setVisibility(View.GONE);
        btnremove.setVisibility(View.GONE);
        btnChat.setVisibility(View.GONE);
        declineButton.setVisibility(View.GONE);
    } else {
        imageLoader = CustomVolleyRequest.getInstance(this.context).getImageLoader();
        if (str_gender.equalsIgnoreCase("Male")) {
            imageLoader.get(url, ImageLoader.getImageListener(imageView, R.drawable.image, R.drawable.girl));
        } else {
            imageLoader.get(url, ImageLoader.getImageListener(imageView, R.drawable.image, R.drawable.boy));
        }
        imageView.setImageUrl(url, imageLoader);
        AgeHeight.setText(ages[position]+" years , "+ heights[position]);
        Community.setText(communities[position]+" / "+castes[position]);
        Occupation.setText(occupations[position]);
        Income.setText(incomes[position]);
        ShortlistedOn.setText(shortlistedOn[position]);

        tvCommunity.setVisibility(View.VISIBLE);
        tvOccupation.setVisibility(View.VISIBLE);
        tvIncome.setVisibility(View.VISIBLE);
        tvShortlistedOn.setVisibility(View.VISIBLE);
        AgeHeight.setVisibility(View.VISIBLE);
        Community.setVisibility(View.VISIBLE);
        Occupation.setVisibility(View.VISIBLE);
        Income.setVisibility(View.VISIBLE);
        ShortlistedOn.setVisibility(View.VISIBLE);
        imageView.setVisibility(View.VISIBLE);
        btnremove.setVisibility(View.VISIBLE);
        btnChat.setVisibility(View.VISIBLE);
        declineButton.setVisibility(View.VISIBLE);
    }

    btnremove.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            delete(position);
        }
    });


    btnChat.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(v.getContext(), BlankActivity.class);
            Log.e("Id*******------------", shortListedModels.get(position).id.toString());
            i.putExtra("ID", shortListedModels.get(position).id);
            i.putExtra("gender", str_gender);
            i.putExtra("current_ID", matri_id_by);
            v.getContext().startActivity(i);
        }
    });


    String strEI = shortListedModels.get(position).expressinterest;
    Log.e("EI-------------->", strEI.toString());
    if (strEI.toString().equalsIgnoreCase("Accepted")) {
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    } else if (strEI.toString().equalsIgnoreCase("Reject")) {
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    } else if (strEI.toString().equalsIgnoreCase("Declined")) {
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    } else if (strEI.toString().equalsIgnoreCase("Pending..")) {
        declineButton.setText(strEI);
        declineButton.setBackgroundColor(Color.parseColor("#FF045B49"));
        declineButton.setEnabled(false);
    } else {
        declineButton.setText(strEI);
    }


    declineButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            express_Intrest(position);
        }
    });
    return listViewItem;
}

public void express_Intrest(final int positionToExpress) {
    StringRequest stringRequest1 = new StringRequest(Request.Method.POST, url1, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            if (response.trim().equalsIgnoreCase("success")) {
                shortListedModels.get(positionToExpress).expressinterest = "Pending..";
                notifyDataSetChanged();
            }
        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(context, error.toString(), Toast.LENGTH_LONG).show();
                }
            }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put(KEY_MATRI_ID_BY, matri_id_by);
            params.put(KEY_MATRI_ID_TO, shortListedModels.get(positionToExpress).id);
            return params;
        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(context);
    requestQueue.add(stringRequest1);
}

public void delete(final int positionToRemove) {
    StringRequest stringRequest1 = new StringRequest(Request.Method.POST, deleteURL, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            if (response.trim().equalsIgnoreCase("success")) {
                shortListedModels.remove(positionToRemove);
                notifyDataSetChanged();
            }
        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(context, error.toString(), Toast.LENGTH_LONG).show();
                }
            }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put(KEY_MATRI_ID_BY, matri_id_by);
            params.put(KEY_MATRI_ID_TO, shortListedModels.get(positionToRemove).id);
            return params;
        }
    };
    RequestQueue requestQueue = Volley.newRequestQueue(context);
    requestQueue.add(stringRequest1);
}

private class ShortListedModel {
    private String id;
    private String age;
    private String height;
    private String communitie;
    private String caste;
    private String education;
    private String occupation;
    private String income;
    private String pic;
    private String location;
    private String status;
    private String expressinterest;
    private String shortlistedOn;


    public ShortListedModel(String id, String age, String height, String communitie, String caste,
                            String education, String occupation, String income, String pic, String location,
                            String status, String expressinterest, String shortlistedOn ) {
        this.id = id;
        this.age = age;
        this.height = height;
        this.communitie = communitie;
        this.caste = caste;
        this.education = education;
        this.occupation = occupation;
        this.income = income;
        this.pic = pic;
        this.location = location;
        this.status = status;
        this.expressinterest = expressinterest;
        this.shortlistedOn=shortlistedOn;
    }
  }
}

答案 1 :(得分：-1)

您需要使用Arraylist而不是Array来动态更新数组数据。然后你可以在delete和notifydatasetchanged（）上动态删除arraylist中的item for refresh listview。

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