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我是一名初學者，在編寫代碼時遇到了一些問題，這些對象已寫入android中的文件。該對象（arraylist）來自一個API，我可以通過執行我的asynctask來獲得它來填充我的文本瀏覽器。問題是如果沒有互聯網連接，我希望asynctask從本地文件中提取數據。我的問題是我不確定放置IF語句來檢查連接並從保存的文件中提取的最佳位置。任何幫助，將不勝感激。在AsyncTask中保存和讀取對象
公共類SearchFrag擴展片段實現View.OnClickListener {
final String TAG = "micgrams";
//INSTAGRAM AUTHENTICATION
private static final String CLIENT_ID = "e79ad9e2173443deb8eea89ef21b15e9";
private static final String CLIENT_SECRET = "d2d64643a7ec4595b4c871d28c59bbf3";
private static final String REDIRECT_URI = "http://clear.com/instagram/access-token";
boolean isConnected;
boolean newtworkBool;
Button search;
EditText searchText;
ConnectionTest connection;
Communicator comm;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.frag_search, container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
connection = new ConnectionTest(getActivity());
isConnected = connection.isConnectedToInternet();
comm = (Communicator) getActivity();
searchText = (EditText) getActivity().findViewById(R.id.searchInput);
search = (Button) getActivity().findViewById(R.id.searchBtn);
search.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Log.d(TAG, " CLICKED!");
Log.d(TAG, "it's Working");
//GETS VALUE OF SEARCHFIELD AND SENDS IT TO
String result = searchText.getText().toString();
Log.d(TAG, "result: " + result);
URL searchForURL = null;
try {
isConnected = connection.isConnectedToInternet();
searchForURL = new URL((makeUrl(result)));
if (isConnected) {
Log.d(TAG, "New CONNECTED!");
Toast.makeText(getActivity(), " Connected!", Toast.LENGTH_LONG).show();
new getInstadata().execute(searchForURL);
} else if (!isConnected) {
Log.d(TAG, "NO CONNECTION FOUND");
Toast.makeText(getActivity(), " NO CONNECTION FOUND!", Toast.LENGTH_LONG).show();
FileInputStream fis = getActivity().openFileInput("myFile");
new getInstadata().execute(searchForURL);
}
} catch (Exception e) {
}
}
//ASYNCTASK CLASS THAT PARSES THE DATA FROM INSTAGRAM
public class getInstadata extends AsyncTask<URL, Integer, JSONObject> {
final String TAG = "realfragments ASYNCTASK";
//DECLARES THE VARIABLES FROM THE ITEMS THAT WILL BE RECEIVE FROM INSTAGRAM
public ArrayList<String> pics = new ArrayList<String>();
public ArrayList<String> user = new ArrayList<String>();
public ArrayList<String> fullname = new ArrayList<String>();
public ArrayList<Bitmap> searchPic = new ArrayList<Bitmap>();
@Override
protected JSONObject doInBackground(URL... urls) {
String jsonString = "";
for (URL searchURL : urls) {
try {
URLConnection conn = searchURL.openConnection();
jsonString = IOUtils.toString(conn.getInputStream());
newtworkBool = true;
break;
} catch (Exception e) {
Log.e(TAG, "Could not establish URLConnection for " + searchURL.toString());
}
}
Log.d(TAG, "Received Data: " + jsonString);
JSONObject instagInfo;
JSONArray instaArray;
MicSearch readMic;
try {
instagInfo = new JSONObject(jsonString);
//TARGETS INSTAGRAM DATA ARRAY
instaArray = instagInfo.getJSONArray("data");
String thisPic;
String thisBio;
String thisUser;
for (int i = 0; i < 5; i++) {
instagInfo = instaArray.getJSONObject(i);
//GETS IMAGE FROM INSTAGRAM AND ADD IT TO THE ARRAYLIST
thisPic = instagInfo.getJSONObject("images").getJSONObject("standard_resolution").getString("url");
pics.add(thisPic);
//GETS FULL NAME FROM INSTAGRAM AND ADD IT TO THE ARRAYLIST
thisBio = instagInfo.getJSONObject("user").getString("full_name");
fullname.add(thisBio);
//GETS USER NAME FROM INSTAGRAM AND ADD IT TO THE ARRAYLIST
thisUser = instagInfo.getJSONObject("user").getString("username");
user.add(thisUser);
}
Log.d(TAG, "username" + user);
Log.d(TAG, "full_name" + fullname);
Log.d(TAG, "url" + pics);
} catch (JSONException e) {
instagInfo = null;
}
try {
Bitmap pulledImage = getBitmapFromURL(pics.get(0));
searchPic.add(pulledImage);
} catch (Exception e) {
}
try {
if (newtworkBool) {
readMic = new MicSearch(user.get(0), fullname.get(0), pics.get(0));
readMic.setUserName(user.get(0));
readMic.setRealName(fullname.get(0));
readMic.setUserImg(pics.get(0));
FileOutputStream fos = getActivity().openFileOutput("myFile", Context.MODE_PRIVATE);
ObjectOutputStream of = new ObjectOutputStream(fos);
of.writeObject(readMic);
of.flush();
of.close();
fos.close();
Log.d(TAG, "saving......." + readMic);
Log.d(TAG, "......" + readMic.getUserName() + readMic.getRealName());
}else if (!newtworkBool) {
FileInputStream fis = getActivity().openFileInput("myFile");
ObjectInputStream ois = new ObjectInputStream(fis);
readMic = (MicSearch) ois.readObject();
ois.close();
Log.d(TAG, "readingOff....." + readMic);
Log.d(TAG, "......." + readMic.getUserName() + readMic.getRealName());
Bitmap pulledImage = getBitmapFromURL(readMic.getUserImg());
searchPic.add(pulledImage);
//comm.Communicate(readMic.getUserName(), readMic.getRealName(), searchPic.get(0));
}
}catch (Exception e) {
}
return instagInfo;
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//ProgressBar progress = (ProgressBar) findViewById(R.id.progressBar3);
//progress.setVisibility(View.VISIBLE);
}
//SETS THE INSTAGRAM/ARRAY ITEMS FOR DISPLAY TO THE USER
@Override
protected void onPostExecute(JSONObject jsonObject) {
super.onPostExecute(jsonObject);
MicSearch readMic = null;
if(newtworkBool){
comm.Communicate(user.get(0), fullname.get(0), searchPic.get(0));
}else if(!newtworkBool){
comm.Communicate(readMic.getUserName(), readMic.getRealName(), searchPic.get(0));
}
doInstagram();
}
}
你可以發佈你的完整AsyncTask，並且你調用'execute（）'？ – 2015-04-06 02:50:46
感謝您的幫助。 – 2015-04-06 03:00:25
你的代碼看起來不錯。你能加載文件嗎？ – 2015-04-06 03:17:02