Fix some rare crashes when restoring the app after termination

Also fixes an issue where the app shortcuts would not work for unencrypted vaults

app/src/main/java/com/beemdevelopment/aegis/ui/AegisActivity.java

@@ -1,5 +1,6 @@
 package com.beemdevelopment.aegis.ui;
 
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.WindowManager;
 
@@ -18,6 +19,15 @@ public abstract class AegisActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         _app = (AegisApplication) getApplication();
 
+        // if the app was killed, relaunch MainActivity and close everything else
+        if (!(this instanceof MainActivity) && !(this instanceof AuthActivity) && _app.getDatabaseManager().isLocked()) {
+            Intent intent = new Intent(this, MainActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
+            startActivity(intent);
+            finish();
+            return;
+        }
+
         // set FLAG_SECURE on the window of every AegisActivity
         if (getPreferences().isSecureScreenEnabled()) {
             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);

app/src/main/java/com/beemdevelopment/aegis/ui/MainActivity.java

@@ -114,9 +114,7 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         super.onNewIntent(intent);
         setIntent(intent);
 
-        if (!doShortcutActions() || _db.isLocked()) {
-            unlockDatabase(null);
-        }
+        doShortcutActions();
     }
 
     @Override
@@ -305,15 +303,11 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         startActivityForResult(scannerActivity, CODE_SCAN);
     }
 
-    private boolean doShortcutActions() {
-        // return false if an action was blocked by a locked database
-        // otherwise, always return true
+    private void doShortcutActions() {
         Intent intent = getIntent();
         String action = intent.getStringExtra("action");
-        if (action == null) {
-            return true;
-        } else if (_db.isLocked()) {
-            return false;
+        if (action == null || _db.isLocked()) {
+            return;
         }
 
         switch (action) {
@@ -323,11 +317,9 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         }
 
         intent.removeExtra("action");
-        return true;
     }
 
     public void startActivityForResult(Intent intent, int requestCode) {
-        intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
         super.startActivityForResult(intent, requestCode);
     }
 
@@ -361,6 +353,7 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         }
 
         updateLockIcon();
+        doShortcutActions();
     }
 
     private BottomSheetDialog createBottomSheet(final DatabaseEntry entry) {

app/src/main/java/com/beemdevelopment/aegis/ui/PreferencesFragment.java

@@ -339,6 +339,11 @@ public class PreferencesFragment extends PreferenceFragmentCompat {
                 return true;
             }
         });
+    }
+
+    @Override
+    public void onActivityCreated (Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
         updateEncryptionPreferences();
     }