cleanup code, use own preference manager

src/main/java/com/owncloud/android/authentication/AuthenticatorActivity.java

@@ -1192,7 +1192,6 @@ public class AuthenticatorActivity extends AccountAuthenticatorActivity
      *
      * @param hasFocus 'True' if focus is received, 'false' if is lost
      */
-
     private void onPasswordFocusChanged(boolean hasFocus) {
         if (hasFocus) {
             showViewPasswordButton();
@@ -1202,7 +1201,6 @@ public class AuthenticatorActivity extends AccountAuthenticatorActivity
         }
     }
 
-
     private void showViewPasswordButton() {
         int drawable = R.drawable.ic_view;
         if (isPasswordVisible()) {

src/main/java/com/owncloud/android/ui/activity/FirstRunActivity.java

@@ -26,12 +26,10 @@ import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.content.Context;
 import android.content.Intent;
-import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.graphics.Color;
 import android.net.Uri;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.support.v4.view.ViewPager;
 import android.view.View;
 import android.view.ViewGroup;
@@ -43,6 +41,7 @@ import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
 import com.owncloud.android.authentication.AccountUtils;
 import com.owncloud.android.authentication.AuthenticatorActivity;
+import com.owncloud.android.db.PreferenceManager;
 import com.owncloud.android.features.FeatureItem;
 import com.owncloud.android.ui.adapter.FeaturesViewAdapter;
 import com.owncloud.android.ui.whatsnew.ProgressIndicator;
@@ -53,7 +52,6 @@ import com.owncloud.android.utils.DisplayUtils;
  */
 public class FirstRunActivity extends BaseActivity implements ViewPager.OnPageChangeListener {
 
-    public static final String KEY_LAST_SEEN_VERSION_CODE = "lastSeenVersionCode";
     public static final String EXTRA_ALLOW_CLOSE = "ALLOW_CLOSE";
     public static final int FIRST_RUN_RESULT_CODE = 199;
 
@@ -162,17 +160,14 @@ public class FirstRunActivity extends BaseActivity implements ViewPager.OnPageCh
     }
 
     private void onFinish() {
-        SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
-        SharedPreferences.Editor editor = pref.edit();
-        editor.putInt(KEY_LAST_SEEN_VERSION_CODE, MainApp.getVersionCode());
-        editor.apply();
+        PreferenceManager.setLastSeenVersionCode(this, MainApp.getVersionCode());
     }
 
-    static private boolean isFirstRun(Context context) {
+    private static boolean isFirstRun(Context context) {
         return AccountUtils.getCurrentOwnCloudAccount(context) == null;
     }
 
-    static public boolean runIfNeeded(Context context) {
+    public static boolean runIfNeeded(Context context) {
         if (context instanceof FirstRunActivity) {
             return false;
         }

src/main/java/com/owncloud/android/ui/activity/WhatsNewActivity.java

@@ -138,7 +138,7 @@ public class WhatsNewActivity extends FragmentActivity implements ViewPager.OnPa
         PreferenceManager.setLastSeenVersionCode(this, MainApp.getVersionCode());
     }
 
-    static public void runIfNeeded(Context context) {
+    public static void runIfNeeded(Context context) {
         if (!context.getResources().getBoolean(R.bool.show_whats_new)
                 || context instanceof WhatsNewActivity) {
             return;
@@ -149,7 +149,7 @@ public class WhatsNewActivity extends FragmentActivity implements ViewPager.OnPa
         }
     }
 
-    static private boolean shouldShow(Context context) {
+    private static boolean shouldShow(Context context) {
         return !(context instanceof PassCodeActivity) && getWhatsNew(context).length > 0;
     }