目前我正在研究如何在给出edittext中项目的关键字时从列表视图中查找项目，列表视图变为空，输出显示在toast消息中，任何人都可以帮助如何找到“项目“以listivew显示它？
public class Home extends ListActivity {
//how many to load on reaching the bottom
int itemsPerPage = 15;
boolean loadingMore = false;
ArrayList<String> songsList;
ListView list;
LazyAdapter adapter, adapter1;
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://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";
private static final String DEBUGTAG = null;
protected static final String TAG = null;
@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) {
//get the text in the EditText
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)))
Toast.makeText(getApplicationContext(), playerName, 1).show();
Home.this.adapter.getFilter();
searchResults.add(songsList.get(i));
Log.d(TAG, "title");
}
}
adapter.notifyDataSetChanged();
list.setAdapter(new ArrayAdapter<String>
(Home.this,
R.layout.activity_home));
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
Home.this.adapter.getFilter();
}
});
答案 0 :(得分：0)
adapter.notifyDataSetChanged();
list.setAdapter(new ArrayAdapter<String>(Home.this, R.layout.activity_home));
您没有提供任何数据集来填充ListView。
就像您最初使用songsList数据
填充ListView一样adapter = new LazyAdapter(this, songsList);
list.setAdapter(adapter);
使用：
adapter = new LazyAdapter(this, searchResults);
list.setAdapter(adapter);
答案 1 :(得分：0)
试试这个， 用于搜索的edittext代码
etSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// Call back the Adapter with current character to Filter
adapter1.getFilter().filter(s.toString());
}
........
将arraylist添加到listview以显示
adapter1 = new MyAdapter(MainActivity.this, mProductArrayList);
lvProducts.setAdapter(adapter1);
适配器类
public class MyAdapter extends BaseAdapter implements Filterable {
private ArrayList<Product> mOriginalValues; // Original Values
private ArrayList<Product> mDisplayedValues; // Values to be displayed
LayoutInflater inflater;
public MyAdapter(Context context, ArrayList<Product> mProductArrayList) {
this.mOriginalValues = mProductArrayList;
this.mDisplayedValues = mProductArrayList;
inflater = LayoutInflater.from(context);
}
..........
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.row, null);
holder.llContainer = (LinearLayout)convertView.findViewById(R.id.llContainer1);
holder.tvName = (TextView) convertView.findViewById(R.id.tvName);
holder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvName.setText(mDisplayedValues.get(position).name);
holder.tvPrice.setText(mDisplayedValues.get(position).price+"");
holder.llContainer.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(MainActivity.this, mDisplayedValues.get(position).price.toString() , Toast.LENGTH_SHORT).show();
}
});
return convertView;
}