【发布时间】：2014-06-12 05:49:02
【问题描述】：
我正在尝试从服务器读取一些数据并根据获取的数据更改 UI 视图。 我必须在后台执行此操作。 当我在创建（主线程）中放入相同的代码时，它运行良好。但是当我将代码粘贴到一些 AsyncTask 中时，它说 “不幸的是......停止了”
private class DataFetch extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
//TextView tvv= (TextView) rootView.findViewById(R.id.textView);
//tvv.setText("AAAAAA");
//ViewFlipper flipper = (ViewFlipper) rootView.findViewById(R.id.viewFlipper1);
//flipper.startFlipping();
// Array of Image IDs to Show In ImageSwitcher
//ImageSwitcher imageSwitcher= (ImageSwitcher) rootView.findViewById(R.id.imageSwitcher1);
//IMS.setImageResource(R.drawable.image1);
//AnimationDrawable animation = new AnimationDrawable();
//animation.addFrame(getResources().getDrawable(R.drawable.image1), 4000);
//animation.addFrame(getResources().getDrawable(R.drawable.image2), 5000);
//animation.addFrame(getResources().getDrawable(R.drawable.image3), 4000);
//animation.setOneShot(false);
//animation.setChangingConfigurations(BIND_ADJUST_WITH_ACTIVITY);
//imageAnim.setImageDrawable(R.drawable.slider);
imageAnim.setScaleType(ScaleType.FIT_XY);
// start the animation!
//animation.start();
JSONObject jsonObject = new JSONObject();
String result = "";
String json = "";
String json_base64 = "";
WindowManager wm = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
int lim= display.getWidth()/80;
//make Json and decode to base64
try {
Time today = new Time("UTC");
today.setToNow();
jsonObject.put("language", "fa");
jsonObject.put("start", 0);
jsonObject.put("limit", lim);
JSONObject filter = new JSONObject();
JSONObject flags = new JSONObject();
//flags.put("my_app", "no");
//flags.put("favorite", "all");
//filter.put("flags", flags);
filter.put("my_apps", false);
JSONArray JA=new JSONArray();
JA.put(1);
filter.put("any_os",JA);
jsonObject.put("time_stamp", today.format("%Y-%m-%dT%H:%M:%SZ"));
json = jsonObject.toString();
byte[] json_bytes = json.getBytes("UTF-8");
json_base64 = Base64.encodeToString(json_bytes, Base64.DEFAULT);
} catch (Exception e) {
}
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("request", json_base64));
InputStream is = null;
// Send the HTTP POST request.
try {
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
// The default value is zero, that means the timeout is not used.
int timeoutConnection = 40000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds which is the timeout for waiting for data.
int timeoutSocket = 60000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
HttpConnectionParams.setTcpNoDelay(params, true);
httpParameters.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpClient httpclient = new DefaultHttpClient(httpParameters);
HttpPost httppost = new HttpPost(base_url+"/service/list/app/");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception ex) {
Toast.makeText(getActivity(), "Your connection timedout", 10000).show();
}
// Read the data into a string.
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
sb.append(line + "\n");
is.close();
result = sb.toString();
next_res=result;
} catch (Exception ex) {
}
return null;
}
@Override
protected void onPostExecute(String result) {
try {
JSONObject jsonObj = new JSONObject(result);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("result");
spinner.setVisibility(View.GONE);
for (int ind = 0; ind <Math.min(3,contacts.length()) /*contacts.length()*/; ind++) {
JSONObject c = contacts.getJSONObject(ind);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(KEY_ID, c.getString("uid"));
ID_Extra = c.getInt("uid");
map.put(KEY_TITLE, c.getString("title"));
map.put(KEY_DESC, c.getString("os"));
map.put(KEY_COST, c.getString("price"));
map.put(KEY_THUMB_URL, c.getString("icon"));
map.put(KEY_apk, c.getString("os"));
Bitmap lazy= getBitmapFromURL(base_url+c.getString("icon"));
//Bitmap lazy= BitmapFactory.decodeResource(this.getResources(), R.drawable.ic_launcher);
gridArray.add(new Item(lazy,c.getString("title")));
// adding HashList to ArrayList
appList.add(map);
}
customGridAdapter = new CustomGridViewAdapter(getActivity(), R.layout.row_grid, gridArray);
gridView.setAdapter(customGridAdapter);
}
catch (Exception e) {
for (int ind = 0; ind < 3 /*contacts.length()*/; ind++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(KEY_ID, Integer.toString(ind));
map.put(KEY_TITLE,"اپلیکیشن نمونه ی "+Integer.toString(ind));
map.put(KEY_DESC, "توضیحات نمونه"+Integer.toString(ind));
map.put(KEY_COST, "رایگان");
map.put(KEY_THUMB_URL,"");
map.put(KEY_apk,"");
//Bitmap lazy= getBitmapFromURL("http://vorujack.ir:8008"+c.getString("icon"));
//Bitmap lazy= BitmapFactory.decodeResource(getActivity().getResources(), R.drawable.dummy_icon);
//gridArray.add(new Item(lazy,"اپلیکیشن نمونه ی "+Integer.toString(ind)));
// adding HashList to ArrayList
appList.add(map);
}
customGridAdapter = new CustomGridViewAdapter(getActivity(), R.layout.row_grid, gridArray);
gridView.setAdapter(customGridAdapter);
}
try
{
customGridAdapter = new CustomGridViewAdapter(getActivity(), R.layout.row_grid, gridArray);
gridView2.setAdapter(customGridAdapter);
}catch(Exception E){}
}
}
解决办法是什么？
【问题讨论】：
-
显示你的 logcat 和 json 数组
标签： java android multithreading android-asynctask