我正在开发一款Android应用。请参阅下面的Java代码。您能解释一下为什么textView不会在代码中的特定行更新，而是在其他行更新。我在代码中对它们进行了评论。
我已经更新了代码，见下文。 想法是从服务器获取Facebook个人资料。当profiling_status等于2意味着配置文件没有准备好，所以我只是ping服务器，直到我得到profiling_status！= 2 .. 我尝试了进展对话框，但放弃了因为我将我的活动放在一个帖子中，但后来我无法得到一些信息，因为我应该在nonUIThread中运行它。试过但我失败了，我失去了耐心......所以决定在我ping服务器时我应该打印＆＃34;加载配置文件。请稍候。＆＃34;没有乱，没有大惊小怪！只是如上所述，textView没有更新。有趣的是.. System.out.println（＆＃34; Here＆＃34;）;被执行。我目前只在AVD上运行它，因为服务器不在无线网络上，因此我无法使用手机进行测试。
public class SelectionFragment extends Fragment {
private ProfilePictureView profilePictureView;
private TextView userNameView;
private UiLifecycleHelper uiHelper;
private static final int REAUTH_ACTIVITY_CODE = 100;
private TextView textView;
private String username = null;
Context context;
JSONObject json = null;
JSONObject json_facebook = null;
int time = 0;
int time_interval = 3000;
int profiling_status = 2;
String logincode;
String usermessage = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHelper = new UiLifecycleHelper(getActivity(), callback);
uiHelper.onCreate(savedInstanceState);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REAUTH_ACTIVITY_CODE) {
uiHelper.onActivityResult(requestCode, resultCode, data);
}
}
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(final Session session, final SessionState state, final Exception exception) {
onSessionStateChange(session, state, exception);
}
};
private void deleteProfile() throws JSONException {
IDThiefHTTPRequest.deleteProfile();
textView.setTextColor(Color.GRAY);
textView.setGravity(Gravity.CENTER);
textView.setText("Press Get profile info button to process your risk of identity theft");
//Facebook logout
Session session2 = Session.getActiveSession();
if (session2 != null) {
session2.close();
}
else {
session2 = new Session(context);
Session.setActiveSession(session2);
session2.close();
}
}
private String readRiskScoreArray(JSONArray json_riskscore) throws NumberFormatException, JSONException{
//get the risk score with only two digits
double risk_score = Double.valueOf(json_riskscore.get(0).toString());
String risk_score2digits = new DecimalFormat("##.##").format(risk_score);
String usermessage = "Your risk score is: ";
usermessage = usermessage + risk_score2digits;
usermessage = usermessage + " which is ranked as: ";
usermessage = usermessage + json_riskscore.get(2).toString();
JSONArray json_reasons = json_riskscore.getJSONArray(1);
for (int i = 0; i < json_reasons.length(); i++){
JSONArray json_reason = json_reasons.getJSONArray(i);
JSONArray json_reasondetails = json_reason.getJSONArray(1);
usermessage = usermessage + "\n\nReason: ";
usermessage = usermessage + json_reasondetails.get(0);
usermessage = usermessage + "\n\nIDThief suggests you to: ";
usermessage = usermessage + json_reasondetails.get(1);
usermessage = usermessage + "\n\nFix it through this link:\n";
usermessage = usermessage + json_reasondetails.get(2);
}
return usermessage;
}
private void displayProfileInfo() throws JSONException {
Session session = Session.getActiveSession();
if (session.isOpened()) {
System.out.println(session.getAccessToken());
}
if (username != null) {
System.out.println("Login stage: Getting profile info for user:" + username);
logincode = username + "!" + session.getAccessToken();
json = IDThiefHTTPRequest.makeLoginHTTPRequest(logincode);
System.out.println(json.toString(4));
json_facebook = json.getJSONObject("facebook");
//profiling_status
profiling_status = Integer.valueOf(json_facebook.get("profiling_status").toString());
if (profiling_status == 2) {
try {
while (profiling_status == 2 && time < 100000) {
textView.setTextColor(Color.BLACK);
textView.setGravity(Gravity.NO_GRAVITY);
textView.setText("Loading profile. Please wait.");
System.out.println("Here");
try {
Thread.sleep(time_interval);
time += time_interval;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
json = IDThiefHTTPRequest.makeLoginHTTPRequest(logincode);
json_facebook = json.getJSONObject("facebook");
//profiling_status
profiling_status = Integer.valueOf(json_facebook.get("profiling_status").toString());
}
if (time >= 100000) {
System.out.println("Time is out");
textView.setText("Server is not responding. Please try again later.");
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
JSONArray json_riskscore = json_facebook.getJSONArray("risk_score");
System.out.println(json_riskscore.toString(4));
usermessage = readRiskScoreArray(json_riskscore);
textView.setTextColor(Color.BLACK);
textView.setGravity(Gravity.NO_GRAVITY);
textView.setText(usermessage);
}
else System.out.println("username is null");
}
@SuppressLint("NewApi")
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.selection,
container, false);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Button deletebutton = (Button) view.findViewById(R.id.ImageButton2);
deletebutton.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
try {
deleteProfile();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
Button button = (Button) view.findViewById(R.id.ImageButton1);
textView = (TextView) view.findViewById(R.id.profiletext);
textView.setMovementMethod(new ScrollingMovementMethod());
textView.setMovementMethod(LinkMovementMethod.getInstance());
button.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
try {
displayProfileInfo();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
// Find the user's profile picture custom view
profilePictureView = (ProfilePictureView) view.findViewById(R.id.selection_profile_pic);
profilePictureView.setCropped(true);
// Find the user's name view
userNameView = (TextView) view.findViewById(R.id.selection_user_name);
// Check for an open session
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// Get the user's data
makeMeRequest(session);
}
return view;
}
private void makeMeRequest(final Session session) {
// Make an API call to get user data and define a
// new callback to handle the response.
Request request = Request.newMeRequest(session,
new Request.GraphUserCallback() {
@Override
public void onCompleted(GraphUser user, Response response) {
// If the response is successful
if (session == Session.getActiveSession()) {
if (user != null) {
// Set the id for the ProfilePictureView
// view that in turn displays the profile picture.
profilePictureView.setProfileId(user.getId());
// Set the Textview's text to the user's name.
userNameView.setText(user.getName());
username = user.getUsername();
//System.out.println("Log in=====================================");
}
}
if (response.getError() != null) {
// Handle errors, will do so later.
}
}
});
request.executeAsync();
}
private void onSessionStateChange(final Session session, SessionState state, Exception exception) {
if (session != null && session.isOpened()) {
// Get the user's data.
makeMeRequest(session);
}
else if (session != null && session.isClosed()) {
textView.setTextColor(Color.GRAY);
textView.setGravity(Gravity.CENTER);
textView.setText("Press Get profile info button to process your risk of identity theft");
}
}
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
}
@Override
public void onSaveInstanceState(Bundle bundle) {
super.onSaveInstanceState(bundle);
uiHelper.onSaveInstanceState(bundle);
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
}
答案 0 :(得分：0)
我的用户名是一个字符串。通常情况下，使用!username.equals()不要在字符串比较中使用!=。该代码可能无法执行
答案 1 :(得分：0)
if (username != null || !username.equals("")) {
//to do
}
答案 2 :(得分：0)
请尝试按照以下方式比较字符串，不要使用==使用equalsIgnoreCase()或equals()方法。
if (profiling_status.equalsIgnoreCase("2")) {
//would not update here either
try {
while (profiling_status.equalsIgnoreCase("2") && time < 100000) {
textView.setText("Loading profile. Please wait.");
try {
Thread.sleep(time_interval);
time += time_interval;
} catch (InterruptedException e) {
e.printStackTrace();
}