此代码使用来自 Web 上的 JSON 和 LazyAdapter 的数据更新 2 ListView 将图像从 URL 转换并放在 ListView 上，在 2.3 上工作正常，但在 Android 4.0 上不起作用。
这是代码
EventosActivity.java
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.eventos);
hojeLista = new ArrayList<HashMap<String, String>>();
proximosLista = new ArrayList<HashMap<String, String>>();
new LoadEventos().execute();
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadEventos extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(EventosActivity.this);
pDialog.setMessage("Dando uma olhada aqui, peraê...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All evento from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_hoje, "GET", params);
JSONObject json2 = jParser.makeHttpRequest(url_proximos, "GET", params);
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
int success2 = json2.getInt(TAG_SUCCESS);
if (success == 1) {
// evento found
// Getting Array of Products
evento = json.getJSONArray(TAG_EVENTO);
// looping through All Products
for (int i = 0; i < evento.length(); i++) {
JSONObject c = evento.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
String titulo = c.getString(TAG_TITULO);
String local_nome = c.getString(TAG_LOCAL_NOME);
String data = c.getString(TAG_DATA);
String imagem = c.getString(TAG_IMAGEM);
//if ("16".equals(TAG_CLASSIFICACAO)) { }
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_TITULO, titulo);
map.put(TAG_LOCAL_NOME, local_nome);
map.put(TAG_DATA, data);
map.put(TAG_IMAGEM, imagem);
// adding HashList to ArrayList
hojeLista.add(map);
}
}
if (success2 == 1) {
// evento found
// Getting Array of Products
evento = json2.getJSONArray(TAG_EVENTO);
// looping through All Products
for (int i = 0; i < evento.length(); i++) {
JSONObject c2 = evento.getJSONObject(i);
// Storing each json item in variable
String id = c2.getString(TAG_ID);
String titulo = c2.getString(TAG_TITULO);
String local_nome = c2.getString(TAG_LOCAL_NOME);
String data = c2.getString(TAG_DATA);
String imagem = c2.getString(TAG_IMAGEM);
//if ("16".equals(TAG_CLASSIFICACAO)) { }
// creating new HashMap
HashMap<String, String> map2 = new HashMap<String, String>();
// adding each child node to HashMap key => value
map2.put(TAG_ID, id);
map2.put(TAG_TITULO, titulo);
map2.put(TAG_LOCAL_NOME, local_nome);
map2.put(TAG_DATA, data);
map2.put(TAG_IMAGEM, imagem);
// adding HashList to ArrayList
proximosLista.add(map2);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all evento
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
ListView list = (ListView)findViewById(android.R.id.list);
ListView list2 = (ListView)findViewById(R.id.lvProximos);
ks.
LazyAdapter adapter=new LazyAdapter(EventosActivity.this, hojeLista);
list.setAdapter(adapter);
LazyAdapter adapter2=new LazyAdapter(EventosActivity.this, proximosLista);
list2.setAdapter(adapter2);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String id2 = ((TextView) view.findViewById(R.id.id)).getText().toString();
Intent in = new Intent(getApplicationContext(), EventoDetalheActivity.class);
in.putExtra(TAG_ID, id2);
startActivityForResult(in, 100);
}
});
list2.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String id2 = ((TextView) view.findViewById(R.id.id)).getText().toString();
Intent in = new Intent(getApplicationContext(), EventoDetalheActivity.class);
in.putExtra(TAG_ID, id2);
startActivityForResult(in, 100);
}
});
}
});
}
}}
LazyAdapter.java
public class LazyAdapter extends BaseAdapter {
private Context activity;
private ArrayList<HashMap<String, String>> data;
private LayoutInflater inflater=null;
//public ImageLoader imageLoader;
private URL url;
private Bitmap bmp;
public LazyAdapter(Context a, ArrayList<HashMap<String, String>> d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//imageLoader=new ImageLoader(activity.getApplicationContext());
}
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.eventoitem, null);
TextView id = (TextView)vi.findViewById(R.id.id);
TextView titulo = (TextView)vi.findViewById(R.id.titulo);
TextView local_nome = (TextView)vi.findViewById(R.id.local_nome);
TextView data0 = (TextView)vi.findViewById(R.id.data);
ImageView im=(ImageView)vi.findViewById(R.id.imgImagem);
HashMap<String, String> evento = new HashMap<String, String>();
evento = data.get(position);
// Setting all values in listview
id.setText(evento.get("id"));
titulo.setText(evento.get("titulo"));
local_nome.setText(evento.get("local_nome"));
data0.setText(evento.get("data"));
try {
url = new URL(evento.get("imagem"));
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
im.setImageBitmap(bmp);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return vi;
}
}
谢谢你帮助我。