Re: [androidbrasil-dev] CLASSE DownloadJsonAsyncTask com erro de setAdapter(adapter) .

Pessoal,

  Estou com um erro na Classe  DownloadJsonAsyncTask . 

  O erro causado é apenas na linha que contém o  setAdapter(adapter) .

  Alguém pode me ajudar ?

  Segue a classe abaixo:

  package com.example.exemplojson;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.app.AlertDialog;

import android.app.ListActivity;

import android.app.ProgressDialog;

import android.os.AsyncTask;

import android.util.Log;

import android.widget.ArrayAdapter;

public class DownloadJsonAsyncTask extends AsyncTask<String, Void, List<Trend>>{

MainActivity myActivity = new MainActivity();

ProgressDialog dialog; 

protected void onPreExecute() { 

super.onPreExecute(); 

dialog = ProgressDialog.show(myActivity, "Aguarde", "Baixando JSON, Por Favor Aguarde...");

}

protected List<Trend> doInBackground(String... params) { 

String urlString = params[0]; HttpClient httpclient = new DefaultHttpClient(); 

HttpGet httpget = new HttpGet(urlString); try { 

HttpResponse response = httpclient.execute(httpget); HttpEntity entity = response.getEntity(); 

if (entity != null) { 

InputStream instream = entity.getContent(); 

String json = toString(instream); instream.close(); 

List<Trend> trends = getTrends(json); return trends; } } 

catch (Exception e) { Log.e("DEVMEDIA", "Falha ao acessar Web service", e); } 

return null; 

} 

private List<Trend> getTrends(String jsonString) { 

List<Trend> trends = new ArrayList<Trend>(); 

try { 

JSONArray trendLists = new JSONArray(jsonString); 

JSONObject trendList = trendLists.getJSONObject(0); 

JSONArray trendsArray = trendList.getJSONArray("trends"); 

JSONObject trend; for (int i = 0; i < trendsArray.length(); i++) {

trend = new JSONObject(trendsArray.getString(i)); Log.i("DEVMEDIA", "nome=" + trend.getString("name")); Trend objetoTrend = new Trend(); objetoTrend.name = trend.getString("name"); objetoTrend.url = trend.getString("url"); trends.add(objetoTrend); } } catch (JSONException e) { Log.e("DEVMEDIA", "Erro no parsing do JSON", e); } return trends; 

}

@Override protected void onPostExecute(List<Trend> result) {

super.onPostExecute(result); dialog.dismiss(); 

if (result.size() > 0) { 

ArrayAdapter<Trend> adapter = new ArrayAdapter<Trend>( myActivity, android.R.layout.simple_list_item_1, result); 

setAdapter(adapter);  // ERRO AQUI.

//setListAdapter(adapter); 

} 

else { 

AlertDialog.Builder builder = new AlertDialog.Builder(myActivity).setTitle("Atenção") .setMessage("Não foi possivel acessar essas informções...") .setPositiveButton("OK", null); builder.create().show(); 

} }

   

private String toString(InputStream is) throws IOException { 

byte[] bytes = new byte[1024]; ByteArrayOutputStream baos = new ByteArrayOutputStream(); 

int lidos; while ((lidos = is.read(bytes)) > 0) 

{ 

baos.write(bytes, 0, lidos); 

} 

return new String(baos.toByteArray()); 

                                                       } 

}

class Trend { 

String name; String url; 

@Override public String toString() { 

return name; 

} 

}

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