Android 使用自定义阵列适配器

问题描述

我正在研究自定义阵列适配器。我有一个可扩展的列表视图，我正在向其中添加列表。我还有一个 search view，用户应该可以在其中搜索任何项目。下面是我的自定义适配器和片段的代码

public class ThreeLevellistadapter extends Baseexpandablelistadapter {

String[] parentHeaders;
List<String[]> secondLevel;
private Context context;
List<LinkedHashMap<String,String[]>> data;

/**
 * Constructor
 * @param context
 * @param parentHeader
 * @param secondLevel
 * @param data
 */
public ThreeLevellistadapter(Context context,String[] parentHeader,List<String[]> secondLevel,List<LinkedHashMap<String,String[]>> data) {
    this.context = context;

    this.parentHeaders = parentHeader;

    this.secondLevel = secondLevel;

    this.data = data;
}

@Override
public int getGroupCount() {
    return parentHeaders.length;
}

@Override
public int getChildrenCount(int groupPosition) {


    // no idea why this code is working

    return 1;

}

@Override
public Object getGroup(int groupPosition) {

    return groupPosition;
}

@Override
public Object getChild(int group,int child) {


    return child;


}



@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition,int childPosition) {
    return childPosition;
}

@Override
public boolean hasstableIds() {
    return true;
}



@Override
public View getGroupView(int groupPosition,boolean isExpanded,View convertView,ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    convertView = inflater.inflate(R.layout.row_first,null);
    TextView text = (TextView) convertView.findViewById(R.id.rowParentText);
    text.setText(this.parentHeaders[groupPosition]);

    return convertView;
}

@Override
public View getChildView(int groupPosition,int childPosition,boolean isLastChild,ViewGroup parent) {

    final SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(context);

    String[] headers = secondLevel.get(groupPosition);


    List<String[]> childData = new ArrayList<>();
    HashMap<String,String[]> secondLevelData = data.get(groupPosition);

    for (String key : secondLevelData.keySet()) {


        childData.add(secondLevelData.get(key));

    }


    secondLevelELV.setAdapter(new SecondLevelAdapter(context,headers,childData));

    secondLevelELV.setGroupIndicator(null);


    secondLevelELV.setonGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        int prevIoUsGroup = -1;

        @Override
        public void onGroupExpand(int groupPosition) {
            if (groupPosition != prevIoUsGroup)
                secondLevelELV.collapseGroup(prevIoUsGroup);
            prevIoUsGroup = groupPosition;
        }
    });


    return secondLevelELV;
}

@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
    return true;
}}

` 片段

SearchView mSearchView;
static String TAG = "product search";
ExpandableListView suggestion_list; 
ThreeLevellistadapter threeLevellistadapterAdapter;
 String[] parent = new String[]{"A2A 100 MG TABS","AQUA-VIT SACHET","broNcopHYLINE SYRUP"};
String[] q1 = new String[]{"BAHRIA TOWN MARKET","MAIN ROAD BAGH MONCHI LADHA"};
String[] q2 = new String[]{"DAROGHEwala MAIN BAZAR"};
String[] q3 = new String[]{"ASKARI-10 HOUSING SOCITEY","CHUNGI DOGAJE"};
String[] des1 = new String[]{"M/S MEDSERVE PHARMACY"};
String[] des2 = new String[]{"M/S DANISH MEDICAL STORE"};
String[] des3 = new String[]{"FUTURE HEALTH PHARMACY","M/S ASAD PHARMACY","M/S GHAFOOR MEDICAL STORE"};
String[] des4 = new String[]{"M/S NOOR MEDICOSE"};
String[] des5 = new String[]{"M/S ABDUL GHAFAR MEDIACL STORE"};
ArrayList<String> parentlist = new ArrayList<String>(Arrays.asList(parent));
LinkedHashMap<String,String[]> thirdLevelq1 = new LinkedHashMap<>();
LinkedHashMap<String,String[]> thirdLevelq2 = new LinkedHashMap<>();
LinkedHashMap<String,String[]> thirdLevelq3 = new LinkedHashMap<>();
/**
 * Second level array list
 */
List<String[]> secondLevel = new ArrayList<>();
/**
 * Inner level data
 */
List<LinkedHashMap<String,String[]>> data = new ArrayList<>();

 secondLevel.add(q1);
    secondLevel.add(q2);
    secondLevel.add(q3);
    thirdLevelq1.put(q1[0],des1);
    thirdLevelq1.put(q1[1],des2);
    thirdLevelq2.put(q2[0],des3);
    thirdLevelq3.put(q3[0],des4);
    thirdLevelq3.put(q3[1],des5);

    data.add(thirdLevelq1);
    data.add(thirdLevelq2);
    data.add(thirdLevelq3);

threeLevellistadapterAdapter = new ThreeLevellistadapter(getActivity(),parent,secondLevel,data);
    suggestion_list.setAdapter(threeLevellistadapterAdapter);

 mSearchView.setonQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            if (TextUtils.isEmpty(s)) {
                // here I want to empty the threeLevellistadapterAdapter

                suggestion_list.clearTextFilter();
            } else {
                // here I want to fill the threeLevellistadapterAdapter 
            }
            return true;
        }
    });

更新 1

我找到了以下代码，它使用可扩展的列表视图实现搜索。

 public void filterData(String query){

 query = query.toLowerCase();
 Log.v("Mylistadapter",String.valueOf(continentList.size()));
 continentList.clear();

 if(query.isEmpty()){
   continentList.addAll(originalList);
 }
 else {

 for(Continent continent: originalList){
 
 ArrayList<Country> countryList = continent.getCountryList();
 ArrayList<Country> newList = new ArrayList<Country>();
 for(Country country: countryList){
 if(country.getCode().toLowerCase().contains(query) ||
   country.getName().toLowerCase().contains(query)){
  newList.add(country);
  }
 }
 if(newList.size() > 0){
  Continent nContinent = new Continent(continent.getName(),newList);
  continentList.add(nContinent);
 }
 }
 }

 Log.v("Mylistadapter",String.valueOf(continentList.size()));
 notifyDataSetChanged();

 }

如何在搜索过程中清除和填充我的自定义适配器？

任何帮助将不胜感激

解决方法

我在我的项目中实现了类似的东西：github.com/CMPUT301W21T21-H03/DivineInspiration

我做这个片段的方法是制作两个数据数组列表，原始的永不改变的数据包含所有内容，然后另一个用于显示列表。如果您检查链接，第 92 行是过滤器，如果搜索文本的长度为 0，则使用原始数据列表重置显示列表，否则，我从原始数据列表开始过滤并将其附加到一个新列表中，该列表将成为末尾有新的显示列表

第一步，使适配器运行在 ArrayList 而不是 String[] 上。以下是一个完整的样品。

MainActivity.java

public class MainActivity extends AppCompatActivity implements ThreeLevelListAdapter.ThreeLevelListViewListener {
SearchView mSearchView;
ExpandableListView suggestion_list;
ThreeLevelListAdapter threeLevelListAdapterAdapter;

String[] parent = new String[]{"A2A 100 MG TABS","AQUA-VIT SACHET","BRONCOPHYLINE SYRUP"};
String[] q1 = new String[]{"BAHRIA TOWN MARKET","MAIN ROAD BAGH MONCHI LADHA"};
String[] q2 = new String[]{"DAROGHEWALA MAIN BAZAR"};
String[] q3 = new String[]{"ASKARI-10 HOUSING SOCITEY","CHUNGI DOGAJE"};
String[] des1 = new String[]{"M/S MEDSERVE PHARMACY"};
String[] des2 = new String[]{"M/S DANISH MEDICAL STORE"};
String[] des3 = new String[]{"FUTURE HEALTH PHARMACY","M/S ASAD PHARMACY","M/S GHAFOOR MEDICAL STORE"};
String[] des4 = new String[]{"M/S NOOR MEDICOSE"};
String[] des5 = new String[]{"M/S ABDUL GHAFAR MEDIACL STORE"};

ArrayList<SampleData> originalList = new ArrayList<>();
ArrayList<SampleData> continentList = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_page);
    suggestion_list = findViewById(R.id.expandable_listview);
    mSearchView = findViewById(R.id.search_view);

    ArrayList<SampleData> secondLevel = new ArrayList<>();

    ArrayList<String> data = new ArrayList<>(Arrays.asList(des1));
    SampleData sampleData = new SampleData(q1[0],data);
    secondLevel.add(sampleData);
    data = new ArrayList<>(Arrays.asList(des2));
    sampleData = new SampleData(q1[1],data);
    secondLevel.add(sampleData);
    originalList.add(new SampleData(parent[0],secondLevel));

    secondLevel = new ArrayList<>();
    data = new ArrayList<>(Arrays.asList(des3));
    sampleData = new SampleData(q2[0],data);
    secondLevel.add(sampleData);
    originalList.add(new SampleData(parent[1],secondLevel));

    secondLevel = new ArrayList<>();
    data = new ArrayList<>(Arrays.asList(des4));
    sampleData = new SampleData(q3[0],data);
    secondLevel.add(sampleData);
    data = new ArrayList<>(Arrays.asList(des5));
    sampleData = new SampleData(q3[1],data);
    secondLevel.add(sampleData);
    originalList.add(new SampleData(parent[2],secondLevel));

    continentList.addAll(originalList);
    threeLevelListAdapterAdapter = new ThreeLevelListAdapter(this,continentList,this);
    suggestion_list.setAdapter(threeLevelListAdapterAdapter);
    suggestion_list.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        int previousGroup = -1;

        @Override
        public void onGroupExpand(int groupPosition) {
            if (groupPosition != previousGroup)
                suggestion_list.collapseGroup(previousGroup);
            previousGroup = groupPosition;
        }
    });
    mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            // Second Step is to adopt your filter code here.
            return true;
        }
    });
}

@Override
public void onFinalItemClick(int plpos,int slpos,int tlpos,String plItem,String slItem,String tlItem) {
    Toast.makeText(this,plItem + "\n" + slItem + "\n" + tlItem,Toast.LENGTH_SHORT).show();
}
}

ThreeLevelListAdapter.java

public class ThreeLevelListAdapter extends BaseExpandableListAdapter {
Context context;
ArrayList<SampleData> overallData;
ThreeLevelListViewListener mThreeLevelListViewListener;
LayoutInflater inflater;

public ThreeLevelListAdapter(Context context,ArrayList<SampleData> overallData,ThreeLevelListViewListener listener) {
    this.context = context;
    this.overallData = overallData;
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    mThreeLevelListViewListener = listener;
}

@Override
public int getGroupCount() {
    return overallData.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    return 1;
}

@Override
public String getGroup(int groupPosition) {
    return overallData.get(groupPosition).getCategory();
}

@Override
public Object getChild(int groupPosition,int childPosition) {
    return overallData.get(groupPosition).getItems();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition,int childPosition) {
    return childPosition;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public View getGroupView(int groupPosition,boolean isExpanded,View convertView,ViewGroup parent) {
    if (convertView == null) convertView = inflater.inflate(R.layout.row_first,null);
    TextView text = convertView.findViewById(R.id.rowParentText);
    text.setText(getGroup(groupPosition));
    return convertView;
}

@Override
public View getChildView(int groupPosition,int childPosition,boolean isLastChild,ViewGroup parent) {
    final SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(context);
    ArrayList<SampleData> childData = (ArrayList<SampleData>) getChild(groupPosition,childPosition);
    secondLevelELV.setAdapter(new SecondLevelAdapter(context,childData));
    secondLevelELV.setGroupIndicator(null);
    secondLevelELV.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        int previousGroup = -1;
        @Override
        public void onGroupExpand(int groupPosition) {
            if (groupPosition != previousGroup)
                secondLevelELV.collapseGroup(previousGroup);
            previousGroup = groupPosition;
        }
    });

    secondLevelELV.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView expandableListView,View view,int i,int i1,long l) {
            int ppos = (int)expandableListView.getTag();
            String plItem = getGroup(ppos);
            SecondLevelAdapter adapter = (SecondLevelAdapter)expandableListView.getExpandableListAdapter();
            String slItem = adapter.getGroup(i);
            String tlItem = (String)adapter.getChild(i,i1);
            mThreeLevelListViewListener.onFinalItemClick(ppos,i,i1,plItem,slItem,tlItem);
            return true;
        }
    });
    secondLevelELV.setTag(groupPosition);

    return secondLevelELV;
}

@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
    return true;
}

public interface ThreeLevelListViewListener{
    void onFinalItemClick(int plpos,String tlItem);
}
}

SecondLevelAdapter.java

public class SecondLevelAdapter extends BaseExpandableListAdapter {
Context context;
ArrayList<SampleData> data;
LayoutInflater inflater;

public SecondLevelAdapter(Context context,ArrayList<SampleData> data) {
    this.context = context;
    this.data = data;
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public String getGroup(int groupPosition) {
    return data.get(groupPosition).getCategory();
}

@Override
public int getGroupCount() {
    return data.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition,ViewGroup parent) {
    if (convertView == null) convertView = inflater.inflate(R.layout.row_second,null);
    TextView text = convertView.findViewById(R.id.rowSecondText);
    text.setText(getGroup(groupPosition));
    return convertView;
}

@Override
public Object getChild(int groupPosition,int childPosition) {
    ArrayList<String> childList = (ArrayList<String>)(data.get(groupPosition).getItems());
    return childList.get(childPosition);
}

@Override
public long getChildId(int groupPosition,int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition,ViewGroup parent) {
    if (convertView == null) convertView = inflater.inflate(R.layout.row_third,null);
    TextView textView = convertView.findViewById(R.id.rowThirdText);
    textView.setText((String)getChild(groupPosition,childPosition));
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    ArrayList<String> childList = (ArrayList<String>)(data.get(groupPosition).getItems());
    return childList.size();
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
    return true;
}
}

SampleData.java

public class SampleData {
String Category;
Object items;

public SampleData(String category,Object items) {
    Category = category;
    this.items = items;
}

public String getCategory() {
    return Category;
}

public Object getItems() {
    return items;
}
}

您所要做的就是为您的搜索创建一个新的 list 并传递到您的适配器。当用户完成搜索后，将第一个列表传递给您的适配器。

    mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String s) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            String text = s.getText().toString().toLowerCase(Locale.getDefault());
            ArrayList<Country> countryList = continent.getCountryList();
            List<Country> resultData = new ArrayList<>();
            for (Country country: countryList) {
                if (country.getCode().toLowerCase().contains(text) ||
                        country.getName().toLowerCase().contains(text) )) {
                    resultData.add(country);
                }
            }

            threeLevelListAdapterAdapter = new ThreeLevelListAdapter(getActivity(),parent,secondLevel,resultData);
            suggestion_list.setAdapter(threeLevelListAdapterAdapter);
            if (text.length() == 0) {
                threeLevelListAdapterAdapter = new ThreeLevelListAdapter(getActivity(),data);
                suggestion_list.setAdapter(threeLevelListAdapterAdapter);
            }
            return true;
        }
        
});

android android custom-arrayadapter expandablelistview expandablelistview fragment fragment fragment searchview searchview

Android 使用自定义阵列适配器

问题描述

解决方法

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