AsyncTask异步加载和Gson
public class MainActivity extends Activity {
private List<Goods> goods=new ArrayList<Goods>();
private ListView lv;
private SmartImageView smartImageView;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.lv);
adapter = new MyAdapter(goods, this);
lv.setAdapter(adapter);
//获得数据
huodeshuju();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Intent intent=new Intent(MainActivity.this,TwoActivity.class);
startActivity(intent);
}
});
}
//获得数据
private void huodeshuju() {
//使用异步
new AsyncTask<String, Void, String>(){
@Override
protected String doInBackground(String... params) {
/*try {
URL url=new URL(params[0]);
HttpURLConnection urlConnection=(HttpURLConnection) url.openConnection();
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
int code=urlConnection.getResponseCode();
if (code==200) {
InputStream inputStream=urlConnection.getInputStream();
BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream));
String readerline;
StringBuffer buffer=new StringBuffer();
while ((readerline=reader.readLine())!=null) {
buffer.append(readerline);
}
String str=buffer.toString();
return str;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
try {
HttpClient httpClient=new DefaultHttpClient();
HttpGet httpGet=new HttpGet(params[0]);
HttpResponse response = httpClient.execute(httpGet);
StatusLine statusLine=response.getStatusLine();
int code=statusLine.getStatusCode();
if (code==200) {
HttpEntity httpEntity=response.getEntity();
String str=EntityUtils.toString(httpEntity, "utf-8");
return str.toString();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
try {
JSONObject obj=new JSONObject(result);
JSONObject list=obj.getJSONObject("list");
JSONArray articles=list.getJSONArray("articles");
Type type=new TypeToken<List<Goods>>(){
}.getType();
Gson gson=new Gson();
List<Goods> goodss=gson.fromJson(articles.toString(), type);
for (Goods goods2 : goodss) {
String title=goods2.getTitle();
String litpic=goods2.getLitpic();
String typeid=goods2.getTypeid();
Goods goods3=new Goods(title, litpic, typeid);
goods.add(goods3);
}
//Log.i("++++++++", goods.toString());
//=======================
//必须刷新
adapter.notifyDataSetChanged();
//======================
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
};
}.execute("http://101.200.142.201:8080/tqyb/newsList.json");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
