放置在 Listview 上时，Android Searchview 不会触发

Posted 2023-05-07

【中文标题】放置在 Listview 上时，Android Searchview 不会触发

【英文标题】：Android Searchview not firing when placed over Listview

【发布时间】：2021-01-12 07:33:55

【问题描述】：

我已经环顾了好几个小时，我发现这个主题要么是 4 年前，要么是使用 EditText，要么是尝试从菜单中运行搜索框。

我想做的是使用现在方便的 SearchView 和 Listview 和自定义适配器（在您键入时进行过滤，甚至显示搜索结果）。不幸的是，这并不顺利，需要帮助。所以 - 列表视图很好地加载了所有内容，甚至出现了搜索框 - 但不幸的是，它在键入后什么也没做：没有类型过滤，没有搜索，看起来这个框甚至都不存在。

这是文件的截取部分-

活动 XML：

 <SearchView
        android:id="@+id/searchView"
        android:layout_
        android:layout_
        android:queryHint="Search..."/>

    <ListView
        android:id="@+id/fullListView"
        android:layout_
        android:layout_
        android:layout_weight="9"
        android:divider="@color/menuColor"
        android:dividerHeight="6dp" >
     </ListView>

行 XML：

 <TextView
        android:id="@+id/textHeading"
        android:layout_
        android:layout_
        android:text="TextView"
        android:textColor="@color/textColor"
        android:textSize="22dp"
        android:textStyle="bold" />

    <LinearLayout
        android:layout_
        android:layout_
        android:orientation="vertical">

        <TextView
            android:id="@+id/textType"
            android:layout_
            android:layout_
            android:text="TextView"
            android:textColor="@color/textColor"
            android:textSize="14dp"
            android:textStyle="italic" />

    </LinearLayout>

    <LinearLayout
        android:layout_
        android:layout_
        android:weightSum="2">

        <TextView
            android:id="@+id/textCounty"
            android:layout_
            android:layout_
            android:layout_weight="1"
            android:text="TextView"
            android:textColor="@color/textColor"
            android:textSize="16dp"
            android:textStyle="italic" />

        <TextView
            android:id="@+id/textTown"
            android:layout_
            android:layout_
            android:layout_weight="1"
            android:text="TextView"
            android:textColor="@color/textColor"
            android:textSize="14dp"
            android:textStyle="italic" />

行类：

public class RowItem 

    private String heading;
    private String type;
    private String county;
    private String town;

    public void setHeading( String theHeading ) 
        this.heading = theHeading;    
    public String getHeading() 
        return this.heading;
    

    public void setType( String theType ) 
        this.type = theType;
    
    public String getType() 
        return this.type;
    

    public void setCounty( String theCounty ) 
        this.county = theCounty;
    
    public String getCounty() 
        return this.county;
    

    public void setTown( String theTown ) 
        this.town = theTown;
    
    public String getTown() 
        return this.town;
    

活动类：

//ListView populate
        myRowItems = new ArrayList<RowItem>();
        fullListView = (ListView) findViewById(R.id.fullListView);
        fillArrayList();
        final CustomAdapter myAdapter = new CustomAdapter(getApplicationContext(), myRowItems);
        fullListView.setAdapter( myAdapter );
        fullListView.setTextFilterEnabled(true);

//Searchies
        searchView = findViewById(R.id.searchView);

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() 
            @Override
            public boolean onQueryTextSubmit(String query) 
                return false;
            

            @Override
            public boolean onQueryTextChange(String newText) 
                myAdapter.getFilter().filter(newText);
                return false;
            
        );

将行组织为：

        RowItem row_001 = new RowItem( );
        row_001.setHeading("PlaceName1");
        row_001.setType("Type1");
        row_001.setCounty("Potato County");
        row_001.setTown("Potato Town");
        myRowItems.add( row_001 );

最后是 CustomAdapter：

public class CustomAdapter extends BaseAdapter implements Filterable 

    private ArrayList<RowItem> singleRow, singleRowFiltered;
    private LayoutInflater thisInflater;

    public CustomAdapter(Context context, ArrayList<RowItem> aRow) 

        this.singleRow = aRow;
        thisInflater = ( LayoutInflater.from(context) );

    

    @Override
    public int getCount() 
        return singleRow.size( );
    

    @Override
    public int getViewTypeCount() 
        return getCount();
    

    @Override
    public int getItemViewType(int position) 
        return position;
    

    @Override
    public Object getItem (int position) 
        return singleRow.get( position );
    

    @Override
    public long getItemId (int position) 
        return position;
    

    @Override
    public View getView (int position, View convertView, ViewGroup parent) 
        if (convertView == null) 
            convertView = thisInflater.inflate( R.layout.list_view_row, parent, false );

            TextView theHeading = (TextView) convertView.findViewById(R.id.textHeading);
            TextView theType = (TextView) convertView.findViewById(R.id.textType);
            TextView theCounty = (TextView) convertView.findViewById(R.id.textCounty);
            TextView theTown = (TextView) convertView.findViewById(R.id.textTown);

            RowItem currentRow = (RowItem) getItem(position);

            theHeading.setText( currentRow.getHeading() );
            theType.setText( currentRow.getType() );
            theCounty.setText( currentRow.getCounty() );
            theTown.setText( currentRow.getTown() );

        
        return convertView;
    

//Filter SearchView
    @Override
    public Filter getFilter() 
        Filter filter = new Filter() 
            @Override
            protected FilterResults performFiltering(CharSequence constraint) 
                FilterResults results = new FilterResults();

                ArrayList<RowItem> arrayListFilter = new ArrayList<RowItem>();

                if (constraint == null || constraint.length() == 0) 
                    results.count = singleRow.size();
                    results.values = singleRow;
                 else 
                    for (RowItem rowItem : singleRow) 
                        if (rowItem.getHeading().toLowerCase().contains(constraint.toString().toLowerCase())) 
                            arrayListFilter.add(rowItem);
                        
                    
                    results.count = arrayListFilter.size();
                    results.values = arrayListFilter;

                
                return results;
            

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) 
                singleRowFiltered = (ArrayList<RowItem>) results.values;
                notifyDataSetChanged();
            
        ;
        return filter;
    

提前感谢我能得到的所有帮助！

【参考方案1】：

试试下面的代码：

public class CustomAdapter extends BaseAdapter implements Filterable 

private ArrayList<RowItem> singleRow, singleRowFiltered;
private LayoutInflater thisInflater;

public CustomAdapter(Context context, ArrayList<RowItem> aRow) 
    this.singleRow = aRow;
    singleRowFiltered = new ArrayList<>(singleRow);
    thisInflater = ( LayoutInflater.from(context) );


@Override
public int getCount() 
    return singleRowFiltered.size( );


@Override
public int getViewTypeCount() 
    return getCount();


@Override
public int getItemViewType(int position) 
    return position;


@Override
public RowItem getItem (int position) 
    return singleRowFiltered.get( position );


@Override
public long getItemId (int position) 
    return position;


@Override
public View getView (int position, View convertView, ViewGroup parent) 
    if (convertView == null) 
        convertView = thisInflater.inflate( R.layout.list_view_row, parent, false );
    
    TextView theHeading = (TextView) convertView.findViewById(R.id.textHeading);
    TextView theType = (TextView) convertView.findViewById(R.id.textType);
    TextView theCounty = (TextView) convertView.findViewById(R.id.textCounty);
    TextView theTown = (TextView) convertView.findViewById(R.id.textTown);

    RowItem currentRow = getItem(position);

    theHeading.setText(currentRow.getHeading() );
    theType.setText(currentRow.getType() );
    theCounty.setText(currentRow.getCounty() );
    theTown.setText(currentRow.getTown() );

    return convertView;


//Filter SearchView
@Override
public Filter getFilter() 
    Filter filter = new Filter() 
        @Override
        protected FilterResults performFiltering(CharSequence constraint) 
            FilterResults results = new FilterResults();

            ArrayList<RowItem> arrayListFilter = new ArrayList<>();

            if (constraint == null || constraint.length() == 0) 
                results.count = singleRow.size();
                results.values = singleRow;
             else 
                for (RowItem rowItem : singleRow) 
                    if (rowItem.getHeading().toLowerCase().contains(constraint.toString().toLowerCase())) 
                        arrayListFilter.add(rowItem);
                    
                
                results.count = arrayListFilter.size();
                results.values = arrayListFilter;
            
            return results;
        

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) 
            singleRowFiltered = (ArrayList<RowItem>) results.values;
            notifyDataSetChanged();
        
    ;
    return filter;