任何人都可以帮我解决这个问题吗？ 我希望自定义列表视图可以在后台加载照片，这样可以减少一些响应时间。
此外，任何人都可以告诉我，如果我想使用这个自定义列表视图加载更多记录，它怎么能实现？
谢谢！
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
setContentView(R.layout.activity);
//ProgressDialog dialog = ProgressDialog.show(this, "", "Loading...", true);
//new Thread(new Runnable() {
// public void run() {
list = (ListView) findViewById(R.id.MyListView); mylist = new ArrayList<HashMap<String, Object>>();
try{
LocationManager locationManager = (LocationManager)getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
lat = location.getLatitude();
lon = location.getLongitude();
mylist=latlng(mylist,lat,lon,From);
}catch(Exception e){
//ShowMsgDialog(e.toString());
}
mSchedule = new SimpleAdapter(this, mylist, R.layout.texteest,new String[] {"textView1","imageView1","textView3"},new int[] {R.id.textView1,R.id.imageView1,R.id.textView3});
mSchedule.setViewBinder(new MyViewBinder());
list.setAdapter(mSchedule);
Button btn_map;
btn_map=(Button)findViewById(R.id.button1);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent i = new Intent(this,"other_java".class);
startActivity(i);
}
});
btn_map.setOnClickListener(new ImageButton.OnClickListener(){
public void onClick(View v) {
//mapresult = Map.showmap;
Intent i = new Intent(this,Map.class);
startActivity(i);
}});
}
private ArrayList<HashMap<String, Object>> latlng(ArrayList<HashMap<String, Object>> mylist,double lat,double lon, int from2) {
try{
ArrayList<NameValuePair> params =new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("lat",String.valueOf(lat)));
params.add(new BasicNameValuePair("lng",String.valueOf(lon)));
params.add(new BasicNameValuePair("fromwhere",String.valueOf(From)));
result = httprequestjava.executeQuery(params);
mapresult = result;
result = result.substring(1);
JSONArray jsonArray = new JSONArray(result);
// result = "";
for(int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonData = jsonArray.getJSONObject(i);
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("textView1",jsonData.getString("somecontent"));
myUrl = new URL(jsonData.getString("img_src"));
InputStream inputStream = (InputStream)myUrl.getContent();
Drawable drawable = Drawable.createFromStream(inputStream, null);
Bitmap mIcon1 =BitmapFactory.decodeStream(myUrl.openConnection().getInputStream());
map.put("imageView1",mIcon1);
map.put("textView3",jsonData.getString("distance")+"m");
//map.put("ItemText", "This is text.....");
//type is not yet done
mylist.add(map);
}
}catch(Exception e){
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_SHORT).show();
}
return mylist;
}
class MyViewBinder implements ViewBinder
{
@Override
public boolean setViewValue(View view, Object data,
String textRepresentation) {
if((view instanceof ImageView)&(data instanceof Bitmap))
{
try{
ImageView iv = (ImageView)view;
Bitmap bmp = (Bitmap)data;
iv.setImageBitmap(bmp);
}catch(Exception e)
{
Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_SHORT).show();
}
return true;
}
return false;
}
}
//auto gen
}