如何实现对使用 ListAdapater、ArrayList 和 HashMap 的 ListView 的搜索 [英] How to implement a search for a ListView that uses ListAdapater, ArrayList and HashMap
问题描述
我有一个从 JSON 数组填充的列表视图.首先从 JSON 数组中提取值，然后放入 HashMap.然后将这个 HashMap 添加到一个 ArrayList 中.从这里开始，必要的数据被添加到 ListAdapter.
I have a list view that I populate from a JSON array. First the values are extracted from the JSON array, then put into a HashMap. Then this HashMap is added to an ArrayList. From here, the necessary data is added to a ListAdapter.
我在网上搜索了好几天，想找到一种方法来为此添加搜索功能，但是他们都没有使用 ListAdapater、ArrayList 和 HashMap 的这种组合.我是初学者，请问有人可以帮我做吗?
I searched online for days now, to find a way to add a search function to this, but none of them uses this combination of ListAdapater, ArrayList and HashMap. I am a beginner so can someone help me do this please?
这是我的代码
public class ListNew extends Activity {
ListView list;
TextView eid;
TextView ename;
TextView edesc;
//Button Btngetdata;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
//URL to get JSON Array
private static String url = "somelink";
//JSON Node Names
private static final String TAG_OS = "events";
private static final String TAG_EID = "eid";
private static final String TAG_ENAME = "ename";
private static final String TAG_ETYPE = "etype";
private static final String TAG_EDESC = "edesc";
private static final String TAG_ESDATE = "esdate";
private static final String TAG_EEDATE = "eedate";
private static final String TAG_ESTIME = "estime";
private static final String TAG_EETIME = "eetime";
private static final String TAG_LOCATION = "location";
private static final String TAG_CREATED_AT = "created_at";
private static final String TAG_EDITED_AT = "edited_at";
private static final String TAG_CREATEDBY = "createdby";
private static final String TAG_IMAGE = "image";
private static final String TAG_APPROVED = "approved";
EditText inputSearch;
ListAdapter adapter;
public static final String TABLE_EVENT = "event";
JSONArray events = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//from here
inputSearch = (EditText) findViewById(R.id.etSearch);
setContentView(R.layout.listnew);
oslist = new ArrayList<HashMap<String, String>>();
new JSONParse().execute();
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
eid = (TextView)findViewById(R.id.vers);
ename = (TextView)findViewById(R.id.name);
edesc = (TextView)findViewById(R.id.api);
pDialog = new ProgressDialog(ListNew.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Getting JSON from URL
JSONObject json = jParser.getJSONFromUrl2(url);
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
pDialog.dismiss();
try {
// Getting JSON Array from URL
events = json.getJSONArray(TAG_OS);
for(int i = 0; i < events.length(); i++){
JSONObject c = events.getJSONObject(i);
// Storing JSON item in a Variable
String eid = c.getString(TAG_EID);
String ename = c.getString(TAG_ENAME);
String etype = c.getString(TAG_ETYPE);
String edesc = c.getString(TAG_EDESC);
String esdate = c.getString(TAG_ESDATE);
String eedate = c.getString(TAG_EEDATE);
String estime = c.getString(TAG_ESTIME);
String eetime = c.getString(TAG_EETIME);
String location = c.getString(TAG_LOCATION);
String created_at = c.getString(TAG_CREATED_AT);
String edited_at = c.getString(TAG_EDITED_AT);
String createdby = c.getString(TAG_CREATEDBY);
String image = c.getString(TAG_IMAGE);
String approved = c.getString(TAG_APPROVED);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_EID, eid);
map.put(TAG_ENAME, ename);
map.put(TAG_ETYPE, etype);
map.put(TAG_EDESC, edesc);
map.put(TAG_ESDATE, esdate);
map.put(TAG_EEDATE, eedate);
map.put(TAG_ESTIME, estime);
map.put(TAG_EETIME, eetime);
map.put(TAG_LOCATION, location);
map.put(TAG_CREATED_AT, created_at);
map.put(TAG_EDITED_AT, edited_at);
map.put(TAG_CREATEDBY, createdby);
map.put(TAG_IMAGE, image);
map.put(TAG_APPROVED, approved);
oslist.add(map);
list=(ListView)findViewById(R.id.list);
TextView emptyText = (TextView)findViewById(R.id.empty);
list.setEmptyView(emptyText);
//Log.d("TAG_is d first one", TAG_APPROVED + "," + approved);
adapter = new SimpleAdapter(ListNew.this, oslist,
R.layout.list_v,
new String[] { TAG_ENAME,TAG_CREATEDBY, TAG_CREATED_AT }, new int[] {
R.id.vers,R.id.name, R.id.api});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent i = new Intent(ListNew.this, NewEvent.class);
i.putExtra("eid", oslist.get(+position).get("eid") );
i.putExtra("ename", oslist.get(+position).get("ename") );
i.putExtra("etype", oslist.get(+position).get("etype") );
i.putExtra("edesc", oslist.get(+position).get("edesc") );
i.putExtra("esdate", oslist.get(+position).get("esdate") );
i.putExtra("eedate", oslist.get(+position).get("eedate") );
i.putExtra("estime", oslist.get(+position).get("estime") );
i.putExtra("eetime", oslist.get(+position).get("eetime") );
i.putExtra("location", oslist.get(+position).get("location") );
i.putExtra("created_at", oslist.get(+position).get("created_at") );
i.putExtra("edited_at", oslist.get(+position).get("edited_at") );
i.putExtra("createdby", oslist.get(+position).get("createdby") );
i.putExtra("image", byteArray);
i.putExtra("approved", oslist.get(+position).get("approved") );
startActivity(i);
}
});
}//end if
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
推荐答案
根据您的描述，我相信您的列表视图有自定义适配器实现.如果自定义适配器需要通过实现来创建自己的过滤器http://developer.android.com/reference/android/widget/Filterable.html
As per you description I believe you have custom adapter implementation for your list view. In case of custom adapters yon need to create your own filters by implementing http://developer.android.com/reference/android/widget/Filterable.html
或
http://developer.android.com/reference/android/widget/过滤器.html
以下是获取灵感的简单教程
Below is the simple tutorial to take inspiration
http://www.survivingwithandroid.com/2012/10/android-listview-custom-filter-and.html
========== 简单搜索示例 ===
========== Example for simple search ===
您需要在列表视图顶部创建一个编辑文本
You need to create an Edit text on top of list view
<EditText
android:id="@+id/editTxt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:maxLines="1" />
然后将文本更改侦听器应用于此编辑文本
Then apply text change listener to this edit text
editTxt.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getFilter().filter(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
你就完成了.
这篇关于如何实现对使用 ListAdapater、ArrayList 和 HashMap 的 ListView 的搜索的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
