为了从列表视图中查找关键项目，我没有在适配器中使用过滤器，但现在通过点击此链接添加了过滤器，但在这一行中String playerName=songsList.get(i).get("title").toString();我收到了错误
The method get(String) is undefined for the type String
并且也searchResults.add(songsList.get(i));作为
The method add(HashMap<String,String>) in the type ArrayList<HashMap<String,String>> is not applicable for the arguments (String)
这是我的整个代码
public class Home extends ListActivity {
//how many to load on reaching the bottom
int itemsPerPage = 15;
boolean loadingMore = false;
//For test data :-)
Calendar d = Calendar.getInstance();
ArrayList<String> songsList;
ListView list;
LazyAdapter adapter;
JSONArray posts;
//ArrayList thats going to hold the search results
ArrayList<HashMap<String, String>> searchResults;
LayoutInflater inflater;
// All static variables
static final String URL = "http://india.abc.net/ads/?json=get_recent_posts";
static final String KEY_POSTS = "posts";
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_DATE = "date";
static final String KEY_CONTENT = "content";
static final String KEY_AUTHOR = "author";
static final String KEY_NAME = "name";
static final String KEY_ATTACHMENTS = "attachments";
static final String KEY_SLUG = "slug";
static final String KEY_THUMB_URL = "thumbnail";
static final String KEY_IMAGES = "images";
static final String KEY_URL = "url";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText searchBox=(EditText) findViewById(R.id.search);
final ListView list=(ListView)findViewById(android.R.id.list);
//get the LayoutInflater for inflating the customomView
//this will be used in the custom adapter
inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
final JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(URL);
try {
posts = json.getJSONArray(KEY_POSTS);
// looping through all song nodes <song>
for(int i = 0; i < posts.length(); i++){
JSONObject c = posts.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(KEY_ID);
String title = c.getString(KEY_TITLE);
String date = c.getString(KEY_DATE);
String content = c.getString(KEY_CONTENT);
// to remove all <P> </p> and <br /> and replace with ""
content = content.replace("<br />", "");
content = content.replace("<p>", "");
content = content.replace("</p>", "");
//authornumber is agin JSON Object
JSONObject author = c.getJSONObject(KEY_AUTHOR);
String name = author.getString(KEY_NAME);
String url = null;
String slug = null;
try {
JSONArray atta = c.getJSONArray("attachments");
for(int j = 0; j < atta.length(); j++){
JSONObject d = atta.getJSONObject(j);
slug = d.getString(KEY_SLUG);
JSONObject images = d.getJSONObject(KEY_IMAGES);
JSONObject thumbnail = images.getJSONObject(KEY_THUMB_URL);
url = thumbnail.getString(KEY_URL);
}
} catch (Exception e) {
e.printStackTrace();
}
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(KEY_ID, id);
map.put(KEY_TITLE, title);
map.put(KEY_DATE, date);
map.put(KEY_NAME, name);
map.put(KEY_CONTENT, content);
map.put(KEY_SLUG, slug);
map.put(KEY_URL, url);
// adding HashList to ArrayList
songsList.add(map);
}
}catch (JSONException e) {
e.printStackTrace();
}
//searchResults=OriginalValues initially
searchResults=new ArrayList<HashMap<String, String>>(songsList);
// Getting adapter by passing json data ArrayList
adapter=new LazyAdapter(this, songsList);
list.setAdapter(adapter);
searchBox.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getFilter().filter(s.toString());
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
}
});
// Launching new screen on Selecting Single ListItem
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
HashMap<String, String> map = songsList.get(position);
Intent in = new Intent(Home.this, Singlemenuitem.class);
in.putExtra(KEY_TITLE, map.get(KEY_TITLE));
in.putExtra(KEY_DATE, map.get(KEY_DATE));
in.putExtra(KEY_NAME, map.get(KEY_NAME));
in.putExtra(KEY_CONTENT, map.get(KEY_CONTENT));
in.putExtra(KEY_URL, map.get(KEY_URL));
startActivity(in);
}
});
适配器类是
public class LazyAdapter extends BaseAdapter implements Filterable{
TextView title;
private Activity activity;
// private TextWatcher textWatcher;
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader;
final EditText searchBox=(EditText) findViewById(R.id.search);
ArrayList<HashMap<String, String>> searchResults;
ArrayList<String> songsList;
public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ImageLoader(activity.getApplicationContext());
}
private EditText findViewById(int search) {
// TODO Auto-generated method stub
return null;
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.activity_home, null);
TextView title = (TextView)vi.findViewById(R.id.title); // title
TextView date = (TextView)vi.findViewById(R.id.date); // artist name
TextView content = (TextView)vi.findViewById(R.id.content); // duration
TextView name = (TextView)vi.findViewById(R.id.name);
// duration
ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image
HashMap<String, String> song = new HashMap<String, String>();
song = data.get(position);
// Setting all values in listview
title.setText(song.get(Home.KEY_TITLE));
date.setText(song.get(Home.KEY_DATE));
content.setText(song.get(Home.KEY_CONTENT));
name.setText(song.get(Home.KEY_NAME));
imageLoader.DisplayImage(song.get(Home.KEY_URL), thumb_image);
return vi;
}
public void add(String string) {
// TODO Auto-generated method stub
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence data,FilterResults searchResults) {
songsList = (ArrayList<String>) searchResults.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence playerName) {
// TODO Auto-generated method stub
return null;
}
};
String searchString=searchBox.getText().toString();
int textLength=searchString.length();
//clear the initial data set
searchResults.clear();
for(int i=0;i<songsList.size();i++)
{
String playerName=songsList.get(i).get("title").toString();
if(textLength<=playerName.length()){
//compare the String in EditText with Names in the ArrayList
if(searchString.equalsIgnoreCase(playerName.substring(0,textLength)))
searchResults.add(songsList.get(i));
}
}
return filter;
}
}