我正在使用以下代码使用Volley库从服务器获取数据。如果没有互联网，该应用程序在不检索数据时可以快速，流畅地运行。但是，随着Internet的打开，该应用程序会变得缓慢，因为它会从服务器获取数据并将其显示在ListView中。是因为数据检索吗？请帮我解决这个问题。
以下是使用的代码：
private void callgetTaskUrlApi() {
StringRequest stringRequest = new StringRequest(Request.Method.POST, getTaskUrl,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
arrayList.clear();
try {
JSONObject jo = new JSONObject(response);
JSONArray ja = jo.getJSONArray("dataObj");
int length=ja.length();
for(int i=0; i<length; i++){
JSONObject temp = ja.getJSONObject(i);
nameC= temp.getString("name");
checkId=temp.getString("clientEid");
clientName=temp.getString("client");
candidateFatherName=temp.getString("fatherName");
clientProcess=temp.getString("otherId");
dueDate=temp.getString("deadline");
JSONArray jsaDate = temp.getJSONArray("updateDetails");
for(int k=0; k<jsaDate.length(); k++){
JSONObject jo1 = jsaDate.getJSONObject(k);
sentDate = jo1.getString("date");
}
JSONArray ja1 = temp.getJSONArray("address");
for(int j=0; j<ja1.length(); j++){
JSONObject jo1 = ja1.getJSONObject(j);
landmark=jo1.getString("landmark");
district= jo1.getString("district");
userAddrss=jo1.getString("full");
Geocoder coder = new Geocoder(getActivity());
List<Address> address1=null;
List<Address> addresses = null;
try {
address1 = coder.getFromLocationName(district, 5);
} catch (IOException e) {
e.printStackTrace();
}
if (address1 == null) {
Toast.makeText(getActivity(), "Fetching Location,Please wait", Toast.LENGTH_SHORT).show();
progressBar.setVisibility(View.INVISIBLE);
return;
}
final Address location11 = address1.get(0);
location11.getLatitude();
location11.getLongitude();
if (checkPermission()) {
LocationManager locationManager=(LocationManager) getContext().getSystemService(Context.LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Location location1 = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location location2 = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
if (location != null) {
latti = location.getLatitude();
longi = location.getLongitude();
} else if (location1 != null) {
latti = location1.getLatitude();
longi = location1.getLongitude();
} else if (location2 != null) {
latti = location2.getLatitude();
longi = location2.getLongitude();
}
coder = new Geocoder(getActivity(), Locale.getDefault());
try {
addresses = coder.getFromLocation(latti, longi, 1);
if (addresses != null && addresses.size() > 0) {
String address = addresses.get(0).getAddressLine(0);
area = addresses.get(0).getLocality();
String city = addresses.get(0).getAdminArea();
String county = addresses.get(0).getCountryName();
String postal_code = addresses.get(0).getPostalCode();
fullAddress=address+","+area+","+city+","+county+","+postal_code;
}
} catch (IOException e) {
e.printStackTrace();
}
}
LatLng source = new LatLng(latti, longi);
LatLng destination = new LatLng(location11.getLatitude(), location11.getLongitude());
double dis= SphericalUtil.computeDistanceBetween(source,destination);
dis/=1000;
arrayList.add(new DataModel(nameC,userAddrss,landmark,checkId,Math.floor(dis*100)/100,clientName,candidateFatherName,clientProcess,sentDate,dueDate));
}
}
..
..
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.INVISIBLE);
Toast.makeText(getActivity(),error.toString(),Toast.LENGTH_LONG ).show();
}
})
{
@Override
protected Map<String, String> getParams() {
Map<String,String> map = new HashMap<String,String>();
return map;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(stringRequest);
}
DataholderAdapter.java
public class DataHolderAdapter extends ArrayAdapter {
private ArrayList<DataModel> dataSet;
Context mContext;
static ProgressDialog progressDialog;
// View lookup cache
private static class ViewHolder {
TextView txtName;
TextView txtAddress;
TextView txtLandmark;
TextView getDirection;
TextView shortDistance;
}
public DataHolderAdapter(ArrayList<DataModel> data, Context context) {
super(context, R.layout.listview_show, data);
this.dataSet = data;
this.mContext=context;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
DataModel dataModel = (DataModel) getItem(position);
final ViewHolder viewHolder; // view lookup cache stored in tag
final View result;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.listview_show, parent, false);
viewHolder.txtName = (TextView) convertView.findViewById(R.id.name);
viewHolder.txtAddress = (TextView) convertView.findViewById(R.id.address);
viewHolder.txtLandmark = (TextView) convertView.findViewById(R.id.Landmark);
viewHolder.getDirection=(TextView) convertView.findViewById(R.id.getDirections);
viewHolder.shortDistance=convertView.findViewById(R.id.shortestDistance);
progressDialog=new ProgressDialog(getContext());
viewHolder.getDirection.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
progressDialog.setMessage("Opening maps...");
progressDialog.show();
Intent i = new Intent(getContext(), MapsActivity.class);
i.putExtra("destination",viewHolder.txtAddress.getText().toString());
i.putExtra("DataHolder","dataholder");
getContext().startActivity(i);
}
});
result=convertView;
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
result=convertView;
}
viewHolder.txtName.setText(dataModel.getName());
viewHolder.txtAddress.setText(dataModel.getAddress());
viewHolder.txtLandmark.setText(Html.fromHtml("<strong>Landmark: </strong>"+dataModel.getLandmark()));
viewHolder.shortDistance.setText(dataModel.getShortDistance() + " kms");
//viewHolder.shortDistance.setBackgroundResource(R.attr.bgHighlight);
return convertView;
}
}
我收到的消息：
I/Choreographer: Skipped 167 frames! The application may be doing
too much work on its main thread.
D/Dialog: mIsSamsungBasicInteraction = false
答案 0 :(得分：3)
Geocoder.getFromLocationName正在阻止您的UI线程。来自文档
查询将被阻止，并且将通过网络查找获得返回的值。结果是最佳猜测，不能保证是有意义或正确的。从与主UI线程分开的线程中调用此方法可能会很有用。
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