如何使用android搜索搜索数组列表？

Question

我目前有一个可扩展列表，我希望能够搜索。我一直在关注Android开发者网站上的this指南，但我坚持实际的方法和展示结果。

1）我的搜索方法被称为doMySearch 2）我想通过孩子阵列

代码扩展列表 包com.sammy.umass搜索;

import android.app.ExpandableListActivity; 
import android.app.SearchManager; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.ContextMenu; 
import android.view.Gravity; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.ContextMenu.ContextMenuInfo; 
import android.view.Window; 
import android.widget.AbsListView; 
import android.widget.BaseExpandableListAdapter; 
import android.widget.ExpandableListAdapter; 
import android.widget.ExpandableListView; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.widget.ExpandableListView.ExpandableListContextMenuInfo; 


public class DirectionsScreenActivity extends ExpandableListActivity { 
ExpandableListAdapter mAdapter; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    //setContentView(R.layout.directions); 
    this.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL); 
    Intent intent = getIntent(); 
    if (Intent.ACTION_SEARCH.equals(intent.getAction())) 
    { 
     String query = intent.getStringExtra(SearchManager.QUERY); 
     doMySearch(query); 
    } 
    // Set up our adapter 
    mAdapter = new MyExpandableListAdapter(); 
    setListAdapter(mAdapter); 
    registerForContextMenu(getExpandableListView()); 
} 

private void doMySearch(String query) 
{ 
    //Search Method 

} 

@Override 
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { 
    menu.setHeaderTitle("Sample menu"); 
    menu.add(0, 0, 0, R.string.expandable_list_sample_action); 
} 

@Override 
public boolean onContextItemSelected(MenuItem item) { 
    ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo(); 

    String title = ((TextView) info.targetView).getText().toString(); 

    int type = ExpandableListView.getPackedPositionType(info.packedPosition); 
    if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) { 
     int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); 
     int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition); 
     Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos, 
       Toast.LENGTH_SHORT).show(); 
     return true; 
    } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) { 
     int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); 
     Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

    return false; 
} 

/** 
* A simple adapter which maintains an ArrayList of photo resource Ids. 
* Each photo is displayed as an image. This adapter supports clearing the 
* list of photos and adding a new photo. 
* 
*/ 
public class MyExpandableListAdapter extends BaseExpandableListAdapter { 
    // Sample data set. children[i] contains the children (String[]) for groups[i]. 
    private String[] groups = { " Academic", " Research & Labs", " Dining Commons", " Points of Interest"," Adminstriation", 
      " Central"," North Apartments"," Northeast"," Orchard Hill"," Southwest"," Sylvan"}; 
    private String[][] children = { 
      //Academic Buildings 
      { "Arnold House","Barlett Hall","Berkshire House","Blaisdell House","Bowditch Hall","Clark Hall","Draper Hall","Duda Hall","East Experiment Station", 
       "Fernal Hall","French Hall","Furcolo Hall","H. Alfond Management Center","Hampshire House","Herter Hall","Hillis House", 
       "Holdsworth Hall","Isenberg School Of Management","Machmer Hall","Marcus Hall","Marston Hall","Middlesex House","Montague House", 
       "Munson Hall","New Africa House","Skinner Hall","South College","Stockbridge/Bowker","Studio Arts Building","Thompson Hall","Tobin Hall", 
       "West Experiment Station"}, 
      //Research and Labs 
      { "Agricultural Engineering","Apiary Laboratory","Astronomy Building","Chenoweth Laboratory","Computer Science Building", 
      "Conte Polymer Research Building","Engineering Laboratory 1","Engineering Laboratory 2","Flint Laboratory","Goessmann Laboratory", 
      "Gunness Laboratory","Hasbrouck Laboratory","Hatch Laboratory","Integrated Science Building","Knowles Engineering Research Building", 
      "Lederle Graduate Reaserch Building","Morrill Science Center","Paige Laboratory","Thayer ANimal Disease Laboratory","W.E.B. Du Bois Library"}, 
      //Dining Commons 
      { "Berkshire", "Franklin","Hampden","Hampshire","Worcester" }, 
      //Points of Interest 
      { "Bowditch Lodge","Boyden Gym","Campus Center/Hotel","Curry Hicks","Durfee Conservatory","Farley Lodge","Fine Arts Center","Grinnell Arena", 
       "Haigis Mall","Mahar Auditorium","McGuirk Alumni Stadium","Mullins Center","Observatory","Old Chapel","Recreation Center","Student Union", 
       "Totman Gym","Vistor's Center"}, 
      //Administration 
      { "Army ROTC Building", "Auxiliary Services Food Store","Campus Center Parking","Chancellor's House","Cold Storage Building", 
        "Police Department","Forest and Parks Building","Goodell","Physical Plant","PVTA Transit Facility","Research Administration", 
        "Shade Tree Lab","Textbook Annex","University Health Services","Whitmore Administration"}, 
      //Central 
      { "Baker", "Brett","Butterfield","Chadbourne","Gorman","Greenough","Van Meter","Wheeler" }, 
      //North Apartments 
      { "North A", "North B","North C","North D" }, 
      //Northeast 
      { "Crabtree", "Dwight","Hamlin","Johnson","Knowlton","Leach","Lewis","Mary Lyon","Thatcher" }, 
      //Orchard Hill 
      { "Dickinson", "Field","Grayson","Webster" }, 
      //Southwest 
      { "Cance", "Coolidge","Crampton","Emerson","James","John Adams","John Quincy Admas","Kennedy","MacKimmie","Melville","Moore","Patteron", 
       "Pierpont","Prince","Thoreau","Washington" }, 
      //Sylvan 
      { "Brown", "Cashin","McNamara"}, 

    }; 

    public Object getChild(int groupPosition, int childPosition) { 
     return children[groupPosition][childPosition]; 
    } 

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

    public int getChildrenCount(int groupPosition) { 
     return children[groupPosition].length; 
    } 

    public TextView getGenericView() { 
     // Layout parameters for the ExpandableListView 
     AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
       ViewGroup.LayoutParams.MATCH_PARENT, 64); 

     TextView textView = new TextView(DirectionsScreenActivity.this); 
     textView.setLayoutParams(lp); 
     // Center the text vertically 
     textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); 
     // Set the text starting position 
     textView.setPadding(36, 0, 0, 0); 
     return textView; 
    } 

    public View getChildView(final int groupPosition,final int childPosition, boolean isLastChild, 
      View convertView, ViewGroup parent) { 
     TextView textView = getGenericView(); 
     textView.setText(getChild(groupPosition, childPosition).toString()); 
     textView.setOnClickListener(new View.OnClickListener(){ 
      public void onClick(View view){ 
      Uri uriToOpen = getUriForView(groupPosition, childPosition); 
      Intent i = new Intent(Intent.ACTION_VIEW, uriToOpen); 
      startActivity(i); 
      } 


    public Object getGroup(int groupPosition) { 
     return groups[groupPosition]; 
    } 

    public int getGroupCount() { 
     return groups.length; 
    } 

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

    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, 
      ViewGroup parent) { 
     TextView textView = getGenericView(); 
     textView.setText(getGroup(groupPosition).toString()); 
     return textView; 
    } 

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

    public boolean hasStableIds() { 
     return true; 
    } 



} 
} 

Answer 1

首先，因为你已经张贴更多的代码比要回答这个问题您的文章非常难读。

无论如何，儿童数组在BaseExpandableListAdapter中声明为私有成员变量。您尚未提供任何工具来访问不同类别的阵列（即DirectionsScreenActivity），因此您需要提供某种方法让DirectionsScreenActivity访问阵列，然后才能对其执行任何操作。

一种方法是制作一个公共（或受保护的）方法，该方法只是返回数组，但可能提供太多访问权限。

我会做的是将搜索方法移动到MyExpandableListAdapter即。

public [some meaningful return type] doSearch(String query) 
{ 
     // Search code 
} 

而是调用DirectionsScreenActivitydoMySearch()的 - 通过您的MyExpandableListAdapter实例调用doSearch()（因为已经有你的阵列），以及做任何你需要做的，结果前：

if (Intent.ACTION_SEARCH.equals(intent.getAction())) 
{ 
    String query = intent.getStringExtra(SearchManager.QUERY); 
    [some meaningful type] result = mAdapter.doSearch(query); 

    // Do something with the result 
} 

至于如何进行搜索，那只是标准的Java，并不是针对Android的。在Java中有一百万个和一个基本搜索算法的例子，所以我不会在这里详细介绍它们。

作为一个方面说明，您可以通过使用散列表的散列表或散列表String --> List<String>来获得更好的性能。键将是组，值将是儿童列表。

这样，如果有人正在查找所有管理员建筑物，您可以在固定时间内获取管理员建筑物列表（只需使用“管理”键从哈希表中检索列表[值]）即可。给定名称的建筑群是有点棘手的，在最坏的情况下需要迭代散列表中的所有项目。