preparing for update

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.patil.quickhac"
-    android:versionCode="1"
-    android:versionName="1.0" >
+    android:versionCode="2"
+    android:versionName="1.1" >
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

src/com/patil/quickhac/CourseSaver.java

@@ -33,6 +33,16 @@ public void saveCourses(Course[] courses, String username, String id) {
 		editor.commit();
 	}
 
+	public void eraseCourses(String username, String id) {
+		String fileName = username + "%" + id;
+		SharedPreferences prefs = context.getSharedPreferences(fileName,
+				Context.MODE_PRIVATE);
+		Editor editor = prefs.edit();
+		editor.remove("savedCourses");
+		editor.remove("lastUpdated");
+		editor.commit();
+	}
+
 	/*
 	 * Saves GPA value
 	 */
@@ -78,6 +88,24 @@ public double getUnweightedGPA(String username, String id) {
 		float gpa = prefs.getFloat("unweightedGPA", 0);
 		return (double) gpa;
 	}
+
+	public void eraseWeightedGPA(String username, String id) {
+		String fileName = username + "%" + id;
+		SharedPreferences prefs = context.getSharedPreferences(fileName,
+				Context.MODE_PRIVATE);
+		Editor editor = prefs.edit();
+		editor.remove("weightedGPA");
+		editor.commit();
+	}
+
+	public void eraseUnweightedGPA(String username, String id) {
+		String fileName = username + "%" + id;
+		SharedPreferences prefs = context.getSharedPreferences(fileName,
+				Context.MODE_PRIVATE);
+		Editor editor = prefs.edit();
+		editor.remove("unweightedGPA");
+		editor.commit();
+	}
 
 	/*
 	 * Returns the cached courses
@@ -108,14 +136,14 @@ public void saveLatestResponse(String response, String username, String id) {
 		editor.commit();
 		Log.d("BackgroundGrades", "saved response ");
 	}
-	
+
 	public String getLatestResponse(String username, String id) {
 		String fileName = username + "%" + id;
 		SharedPreferences prefs = context.getSharedPreferences(fileName,
 				Context.MODE_PRIVATE);
 		String savedResponse = prefs.getString("savedResponse", null);
 		Log.d("BackgroundGrades", "got saved response ");
-		if(savedResponse == null) {
+		if (savedResponse == null) {
 			Log.d("BackgroundGrades", "saved response is null");
 		}
 		return savedResponse;

src/com/patil/quickhac/MainActivity.java

@@ -19,6 +19,8 @@
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.Editor;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Configuration;
 import android.graphics.Color;
 import android.os.AsyncTask;
@@ -135,7 +137,6 @@ protected void onCreate(Bundle savedInstanceState) {
 		}
 		loggedIn = false;
 		utils = new Utils(this);
-		settingsManager = new SettingsManager(this);
 		colorGenerator = new ColorGenerator(this);
 		saver = new CourseSaver(this);
 		currentTitle = "Overview";
@@ -148,6 +149,10 @@ protected void onCreate(Bundle savedInstanceState) {
 		makeDrawer();
 	}
 
+	public void handleUpdate() {
+
+	}
+
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
 		// Pass the event to ActionBarDrawerToggle, if it returns
@@ -263,6 +268,39 @@ public boolean onPrepareOptionsMenu(Menu menu) {
 	public boolean onCreateOptionsMenu(Menu menu) {
 		getMenuInflater().inflate(R.menu.main, menu);
 		this.menu = menu;
+		settingsManager = new SettingsManager(this);
+
+		Log.d("JustUpdate", "Handling update");
+		// Erase credentials if just updated to avoid weird data things
+		if (settingsManager.justUpdated()) {
+			Log.d("JustUpdate", "Just updated so wiping things");
+			studentList = settingsManager.getStudentList();
+			if (studentList != null) {
+				// Erase student info and saved grades
+				for (int i = 0; i < studentList.length; i++) {
+					String user = studentList[i].split("%")[0];
+					String id = studentList[i].split("%")[1];
+					settingsManager.eraseCredentials(user, id);
+					saver.eraseCourses(user, id);
+					saver.eraseWeightedGPA(user, id);
+					saver.eraseUnweightedGPA(user, id);
+				}
+				// Erase student list
+				settingsManager.eraseStudentList();
+			}
+			// Save the new current version
+			PackageInfo pInfo = null;
+			try {
+				pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
+			} catch (NameNotFoundException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
+			if (pInfo != null) {
+				settingsManager.saveCurrentVersion(pInfo.versionCode);
+			}
+		}
+
 		if (!alreadyLoadedGrades) {
 			startDisplayingGrades();
 			alreadyLoadedGrades = true;
@@ -298,12 +336,9 @@ protected void onPostCreate(Bundle savedInstanceState) {
 	public void startDisplayingGrades() {
 		String selectedStudent = settingsManager.getSelectedStudent();
 		String[] students = settingsManager.getStudentList();
-		if (students != null) {
+		if (selectedStudent != null && students != null) {
 			studentList = students;
-		} else {
-			studentList = new String[0];
-		}
-		if (selectedStudent != null) {
+			Log.d("JustUpdated", "students aren't null wtf");
 			// We have a student to load
 			String[] credentials = settingsManager
 					.getLoginInfo(selectedStudent);
@@ -328,7 +363,8 @@ public void startDisplayingGrades() {
 									credentials[2]);
 					// check if it's been less than 30 minutes since grades
 					// updated
-					if (timeSinceLastUpdated < Constants.GRADE_LENGTH && !startedFromRefresh) {
+					if (timeSinceLastUpdated < Constants.GRADE_LENGTH
+							&& !startedFromRefresh) {
 						// Grades updated less than 30 min ago and we aren't
 						// trying to refresh, don't bother
 						// getting new grades
@@ -372,34 +408,37 @@ public void startDisplayingGrades() {
 						selectedStudent.split("%")[1]);
 				restartActivity();
 			}
+			makeStudentSpinner();
 		} else {
 			currentUsername = "";
 			currentId = "";
 			currentDistrict = "";
 			signInButton.setVisibility(View.VISIBLE);
 			startLogin();
 		}
-		makeStudentSpinner();
 	}
 
 	@Override
 	protected void onResume() {
 		super.onResume();
-		long lastLogin = settingsManager.getLastLogin(currentUsername,
-				currentId);
-		if (System.currentTimeMillis() - lastLogin > Constants.LOGIN_TIMEOUT) {
-			Log.d("Resuming",
-					"it's been a while"
-							+ String.valueOf(System.currentTimeMillis()
-									- lastLogin));
-			// Since the login should have timed out, set loggedin to false so
-			// that it'll log in again to avoid timeout issues
-			loggedIn = false;
-		} else {
-			Log.d("Resuming",
-					"it's been not that long"
-							+ String.valueOf(System.currentTimeMillis()
-									- lastLogin));
+		if (settingsManager != null) {
+			long lastLogin = settingsManager.getLastLogin(currentUsername,
+					currentId);
+			if (System.currentTimeMillis() - lastLogin > Constants.LOGIN_TIMEOUT) {
+				Log.d("Resuming",
+						"it's been a while"
+								+ String.valueOf(System.currentTimeMillis()
+										- lastLogin));
+				// Since the login should have timed out, set loggedin to false
+				// so
+				// that it'll log in again to avoid timeout issues
+				loggedIn = false;
+			} else {
+				Log.d("Resuming",
+						"it's been not that long"
+								+ String.valueOf(System.currentTimeMillis()
+										- lastLogin));
+			}
 		}
 	}
 

src/com/patil/quickhac/SettingsManager.java

@@ -7,6 +7,8 @@
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.Editor;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager.NameNotFoundException;
 import android.preference.PreferenceManager;
 
 public class SettingsManager {
@@ -76,10 +78,19 @@ public String[] getStudentList() {
 		if (studentListSet != null) {
 			studentList = studentListSet.toArray(new String[0]);
 		} else {
-			studentList = new String[0];
+			studentList = null;
 		}
 		return studentList;
 	}
+
+	/*
+	 * Erases student list
+	 */
+	public void eraseStudentList() {
+		Editor edit = defaultPrefs.edit();
+		edit.remove("studentList");
+		edit.commit();
+	}
 
 	/*
 	 * Saves a studentlist
@@ -166,7 +177,7 @@ public void removeStudent(String username, String id) {
 		}
 	}
 
-	private void eraseCredentials(String username, String id) {
+	public void eraseCredentials(String username, String id) {
 		String fileName = username + "%" + id;
 		SharedPreferences prefs = context.getSharedPreferences(fileName,
 				Context.MODE_PRIVATE);
@@ -177,7 +188,36 @@ private void eraseCredentials(String username, String id) {
 		edit.putString("district", "");
 		edit.commit();
 	}
-
+
+	public boolean justUpdated() {
+		// Get the current version of the app
+		PackageInfo pInfo = null;
+		try {
+			pInfo = context.getPackageManager().getPackageInfo(
+					context.getPackageName(), 0);
+		} catch (NameNotFoundException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		if (pInfo != null) {
+			int currentVersion = pInfo.versionCode;
+			int savedVersion = defaultPrefs.getInt("savedVersion", 0);
+			// If the version saved is different from the version we currently
+			// have
+			if (savedVersion != currentVersion) {
+				// we just updated
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public void saveCurrentVersion(int version) {
+		Editor edit = defaultPrefs.edit();
+		edit.putInt("savedVersion", version);
+		edit.commit();
+	}
+
 	public void saveLastLogin(String username, String id, long millis) {
 		String fileName = username + "%" + id;
 		SharedPreferences prefs = context.getSharedPreferences(fileName,
@@ -186,7 +226,7 @@ public void saveLastLogin(String username, String id, long millis) {
 		edit.putLong("lastLogin", millis);
 		edit.commit();
 	}
-	
+
 	public long getLastLogin(String username, String id) {
 		String fileName = username + "%" + id;
 		SharedPreferences prefs = context.getSharedPreferences(fileName,