我是一名初学者，在编码方面，我遇到了一个已经写入android文件的对象的问题。那个对象（arraylist）来自一个api，我可以通过执行我的asynctask来连接互联网时填充我的文本视图。问题是，如果没有互联网连接，我希望asynctask从本地文件中提取数据。我的问题是我不确定将IF语句放入检查连接并从保存的文件中提取的最佳位置。任何帮助将不胜感激。
public class SearchFrag extends Fragment实现了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();
}
}
答案 0 :(得分：0)
我不确定将IF语句检查的最佳位置 连接并从保存的文件中拉出
在doInBackground。
因为检查网络连接和从api获取数据都与网络相关的任务有关。系统将花费时间执行这两项任务。