你好我的listview中有chechbox的问题。我整天都在尝试，但我不能这样做：/我想：当有人点击复选框时，我想将菜单项的标题从取消更改为保存（1），当选择下一个保存（2）等我希望获取所选产品的ID和数量。 我得到了身份证明，但我认为这是错误的方式，因为现在当有人点击复选框时，我会收集大量产品。如果有人点击并接下来改变数量的价值怎么办...任何人都可以帮助我？ Plsss
我的代码：
片段
package befit.example.com.befit.Fragments;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import com.ami.fundapter.BindDictionary;
import com.ami.fundapter.extractors.StringExtractor;
import com.kosalgeek.android.json.JsonConverter;
import com.kosalgeek.asynctask.AsyncResponse;
import com.kosalgeek.asynctask.PostResponseAsyncTask;
import org.json.JSONArray;
import org.json.JSONException;
import java.util.ArrayList;
import java.util.HashMap;
import befit.example.com.befit.Adapter.MyFunDapter;
import befit.example.com.befit.R;
import befit.example.com.befit.Serialized.Products;
public class SearchFragment extends Fragment {
private ListView lvSearch;
private SearchView searchView;
private HashMap postData;
private PostResponseAsyncTask loginTask;
private ArrayList<Products> productsList;
private Bundle bundle;
private MenuItem save;
private RelativeLayout layoutInvisible;
private MyFunDapter<Products> adapter;
private ArrayList products, sizes;
private String resultAll;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
bundle = this.getArguments();
if (bundle != null) {
String type = bundle.getString("type");
((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(type);
}
return inflater.inflate(R.layout.fragment_search, parent, false);
}
public void onViewCreated(View view, Bundle savedInstanceState) {
setHasOptionsMenu(true);
lvSearch(view);
search(view);
getCounterFromAdapter();
}
private void getCounterFromAdapter() {
int counter = adapter.getCounter();
if (counter != 0)
save.setTitle("Save (" + counter + ")");
else
save.setTitle("Cancel");
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.fragment_search_menu, menu);
save = menu.findItem(R.id.save);
super.onCreateOptionsMenu(menu, inflater);
}
private void lvSearch(View view) {
lvSearch = (ListView) view.findViewById(R.id.lvSearch);
postData = new HashMap();
postData.put("mobile", "android");
loginTask = new PostResponseAsyncTask(getActivity(), postData, new AsyncResponse() {
@Override
public void processFinish(String result) {
resultAll = result;
productsList = new JsonConverter<Products>().toArrayList(result, Products.class);
BindDictionary<Products> dict = new BindDictionary<Products>();
dict.addStringField(R.id.tvProductsName, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return products.name;
}
});
dict.addStringField(R.id.tvProductsWeight, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return products.quantity + " gram - " + products.calories + " kcal";
}
});
dict.addStringField(R.id.tvSearchSize, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return products.quantity + "";
}
});
dict.addStringField(R.id.tvSearchCalories, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return "Calories: " + products.calories + " kcal";
}
});
dict.addStringField(R.id.tvSearchFat, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return "Fat: " + products.fat + " gram";
}
});
dict.addStringField(R.id.tvSearchCarbs, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return "Carbs: " + products.carbs + " gram";
}
});
dict.addStringField(R.id.tvSearchProtein, new StringExtractor<Products>() {
@Override
public String getStringValue(Products products, int position) {
return "Protein: " + products.protein + " gram";
}
});
adapter = new MyFunDapter<Products>(getActivity(), productsList, R.layout.list_view_search, dict);
lvSearch.setAdapter(adapter);
}
});
loginTask.execute("http://10.0.3.2/befit/products.php");
lvSearch.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, final View adapterView, int position, long id) {
layoutInvisible = (RelativeLayout) adapterView.findViewById(R.id.layoutInvisible);
if (layoutInvisible.getVisibility() == View.VISIBLE)
layoutInvisible.setVisibility(View.GONE);
else
layoutInvisible.setVisibility(View.VISIBLE);
getCounterFromAdapter();
}
});
}
private void search(View view) {
searchView = (SearchView) view.findViewById(R.id.searchView);
searchView.setQueryHint("Search...");
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//adapter.getFilter().filter(newText);
return false;
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.save) {
int sizeOfProducts = adapter.getClickedProducts().size();
if (sizeOfProducts > 0) {
products = adapter.getClickedProducts();
sizes = adapter.getClickedSize();
postData = new HashMap();
postData.put("mobile", "android");
try {
JSONArray jArray = new JSONArray(resultAll);
postData.put("p1", jArray.getJSONObject(Integer.parseInt(products.get(0).toString())).getInt("id_produktu"));
postData.put("r1", Integer.parseInt(sizes.get(0).toString()));
if (sizeOfProducts > 1) {
postData.put("p2", jArray.getJSONObject(Integer.parseInt(products.get(1).toString())).getInt("id_produktu"));
postData.put("r2", Integer.parseInt(sizes.get(1).toString()));
}
if (sizeOfProducts > 2) {
postData.put("p3", jArray.getJSONObject(Integer.parseInt(products.get(2).toString())).getInt("id_produktu"));
postData.put("r3", Integer.parseInt(sizes.get(2).toString()));
}
if (sizeOfProducts > 3) {
postData.put("p4", jArray.getJSONObject(Integer.parseInt(products.get(3).toString())).getInt("id_produktu"));
postData.put("r4", Integer.parseInt(sizes.get(3).toString()));
}
} catch (JSONException e) {
e.printStackTrace();
}
/*
loginTask = new PostResponseAsyncTask(getActivity(), postData, new AsyncResponse() {
@Override
public void processFinish(String s) {
}
});
loginTask.execute("10.0.3.2/products.php");
*/
return true;
}
}
return super.onOptionsItemSelected(item);
}
}
适配器
package befit.example.com.befit.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.ami.fundapter.BindDictionary;
import com.ami.fundapter.FunDapterUtils;
import com.ami.fundapter.interfaces.FunDapterFilter;
import java.util.ArrayList;
import java.util.List;
import befit.example.com.befit.R;
import interfaces.LongExtractor;
/**
* A generic adapter that takes a BindDictionary and data and shows them. Does
* basic validation for you for all fields and also handles the ViewHolder
* pattern.
*
* @param <T>
* @author Ami G
*/
public class MyFunDapter<T> extends BaseAdapter implements Filterable {
protected List<T> mDataItems;
protected List<T> mOrigDataItems;
protected LongExtractor<T> idExtractor;
protected final Context mContext;
private final int mLayoutResource;
private final BindDictionary<T> mBindDictionary;
private int oddColorRes;
private int evenColorRes;
private FunDapterFilter<T> funDapterFilter;
private Filter mFilter;
public int counter = 0;
private ArrayList<String> products, size;
/**
* A generic adapter that takes a BindDictionary and data and shows them.
* Does basic validation for you for all fields and also handles the
* ViewHolder pattern.
*
* @param context
* @param dataItems - An arraylist of model items
* @param layoutResource - resource ID of a layout to inflate for each item. (Example:
* R.layout.list_item)
* @param dictionary - The dictionary that will match between fields and data.
*/
public MyFunDapter(Context context, List<T> dataItems, int layoutResource,
BindDictionary<T> dictionary) {
this(context, dataItems, layoutResource, null, dictionary);
}
/**
* A generic adapter that takes a BindDictionary and data and shows them.
* Does basic validation for you for all fields and also handles the
* ViewHolder pattern.
*
* @param context
* @param dataItems - An arraylist of model items
* @param layoutResource - resource ID of a layout to inflate for each item. (Example:
* R.layout.list_item)
* @param idExtractor - The extractor that will get stable ids from the data item
* @param dictionary - The dictionary that will match between fields and data.
*/
public MyFunDapter(Context context, List<T> dataItems, int layoutResource,
LongExtractor<T> idExtractor, BindDictionary<T> dictionary) {
this.mContext = context;
this.mDataItems = dataItems;
this.mOrigDataItems = dataItems;
this.mLayoutResource = layoutResource;
this.idExtractor = idExtractor;
this.mBindDictionary = dictionary;
}
/**
* Replace the current dataset with a new one and refresh the views. This
* will call notifyDataSetChanged() for you.
*
* @param dataItems
*/
public void updateData(List<T> dataItems) {
this.mDataItems = dataItems;
this.mOrigDataItems = dataItems;
notifyDataSetChanged();
}
@Override
public int getCount() {
if (mDataItems == null || mBindDictionary == null) return 0;
return mDataItems.size();
}
@Override
public T getItem(int position) {
return mDataItems.get(position);
}
@Override
public boolean hasStableIds() {
if (idExtractor == null) return super.hasStableIds();
else return true;
}
@Override
public long getItemId(int position) {
if (idExtractor == null) return position;
else return idExtractor.getLongValue(getItem(position), position);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// Inflate a new view or use a recycled view.
View v = convertView;
final MyGenericViewHolder holder;
if (null == v) {
LayoutInflater vi =
(LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(mLayoutResource, null);
holder = new MyGenericViewHolder();
holder.root = v;
holder.tvSearchFat = (TextView) v.findViewById(R.id.tvSearchFat);
holder.tvSearchSize = (TextView) v.findViewById(R.id.tvSearchSize);
holder.layoutInvisible = (RelativeLayout) v.findViewById(R.id.layoutInvisible);
holder.checkBox = (CheckBox) v.findViewById(R.id.checkBox);
// init the sub views and put them in a holder instance
FunDapterUtils.initViews(v, holder, mBindDictionary);
v.setTag(holder);
} else {
holder = (MyGenericViewHolder) v.getTag();
}
// Show the data
final T item = getItem(position);
showData(item, holder, position);
holder.layoutInvisible.setVisibility(View.GONE);
products = new ArrayList<String>();
size = new ArrayList<String>();
holder.checkBox.setTag(R.id.ID_TAG, position);
holder.checkBox.setTag(R.id.SIZE_TAG, holder.tvSearchSize.getText().toString());
holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String id = String.valueOf(v.getTag(R.id.ID_TAG));
String sizeOfProduct = String.valueOf(v.getTag(R.id.SIZE_TAG));
if(holder.checkBox.isChecked()) {
counter++;
products.add(id);
size.add(sizeOfProduct);
}
else{
counter--;
products.remove(id);
size.remove(sizeOfProduct);
}
}
});
return v;
}
public ArrayList getClickedProducts(){
return products;
}
public ArrayList getClickedSize(){
return size;
}
public int getCounter(){
return counter;
}
private void showData(T item, MyGenericViewHolder holder, int position) {
// handles alternating background colors if selected
if (oddColorRes > 0 && evenColorRes > 0) {
if (position % 2 == 0) {
holder.root.setBackgroundColor(mContext.getResources().getColor(evenColorRes));
} else {
holder.root.setBackgroundColor(mContext.getResources().getColor(oddColorRes));
}
}
FunDapterUtils.showData(item, holder, position, mBindDictionary);
}
public MyFunDapter<T> setAlternatingBackground(int oddColorRes, int evenColorRes) {
if (oddColorRes <= 0 || evenColorRes <= 0) {
throw new IllegalArgumentException("Color parameters are illegal");
}
this.oddColorRes = oddColorRes;
this.evenColorRes = evenColorRes;
return this;
}
/**
* @param idExtractor - used to extract a stable id from the underlying data item (like a database id or something)
*/
public void setIdExtractor(LongExtractor<T> idExtractor) {
this.idExtractor = idExtractor;
}
@Override
public Filter getFilter() {
return mFilter;
}
/**
* Use this method to enable filtering in the adapter.
*
* @param filter - a filter implementation for your adapter.
*/
public void initFilter(FunDapterFilter<T> filter) {
if (filter == null)
throw new IllegalArgumentException("Cannot pass a null filter to FunDapter");
this.funDapterFilter = filter;
mFilter = new Filter() {
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
@SuppressWarnings("unchecked") List<T> list = (List<T>) results.values;
if (results.count == 0) {
resetData();
} else {
mDataItems = list;
}
notifyDataSetChanged();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint == null || constraint.length() == 0) {
// No constraint - no point in filtering.
results.values = mOrigDataItems;
results.count = mOrigDataItems.size();
} else {
// Perform the filtering operation
List<T> filter =
funDapterFilter.filter(constraint.toString(), mOrigDataItems);
results.count = filter.size();
results.values = filter;
}
return results;
}
};
}
public void resetData() {
mDataItems = mOrigDataItems;
}
}
Pllssss帮助我:)）
答案 0 :(得分：0)
利用界面获取适配器中检查的项目数， 然后使用值
inavlidateMenu（）<强>接口
public interface MyAdapterClickInterface{
public void itemChecked(int position);
}
现在在您的片段中将其更改为
public class SearchFragment extends Fragment implements MyAdapterClickInterface{
int itemsChecked = 0; //this will keep a note of items to be shown in menu
// if you want to save items also then add an attribute to your Products class to get checked item
实施方法
public void itemChecked(int position){
itemsChecked++;
invalidateOptionsMenu();
}
在片段中初始化适配器时，请将该调用更改为：
adapter = new MyFunDapter<Products>(getActivity(), productsList, R.layout.list_view_search, dict, this);//this means fragments implementations
现在在您的适配器构造函数
中MyAdapterClickInterface checkedListener;
public MyFunDapter(Context context, List<T> dataItems, int layoutResource,
LongExtractor<T> idExtractor, BindDictionary<T> dictionary, MyAdapterClickInterface checkedListener) {
this.mContext = context;
this.checkedListener = checkedListener; //making use of interface instance
...
}
现在终于在检查您的商品时
了holder.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(holder.checkBox.isChecked()){
checkedListener.itemChecked(position);
//or some other method to save your checks..
}
这将做你想做的事情.. :)）