Prompt the user about unsaved changes in SlotManagerActivity

Close #13

app/src/main/java/me/impy/aegis/ui/EditProfileActivity.java

@@ -214,12 +214,10 @@ public class EditProfileActivity extends AegisActivity {
             return;
         }
 
-        new AlertDialog.Builder(this)
-                .setTitle("Discard changes?")
-                .setMessage("Your changes have not been saved")
-                .setPositiveButton(R.string.save, (dialog, which) -> onSave())
-                .setNegativeButton(R.string.discard, (dialog, which) -> super.onBackPressed())
-                .show();
+        Dialogs.showDiscardDialog(this,
+                (dialog, which) -> onSave(),
+                (dialog, which) -> super.onBackPressed()
+        );
     }
 
     @Override

app/src/main/java/me/impy/aegis/ui/SlotManagerActivity.java

@@ -23,6 +23,7 @@ import me.impy.aegis.db.slots.Slot;
 import me.impy.aegis.db.slots.SlotCollection;
 import me.impy.aegis.db.slots.SlotException;
 import me.impy.aegis.helpers.FingerprintHelper;
+import me.impy.aegis.ui.dialogs.Dialogs;
 import me.impy.aegis.ui.dialogs.FingerprintDialogFragment;
 import me.impy.aegis.ui.dialogs.PasswordDialogFragment;
 import me.impy.aegis.ui.views.SlotAdapter;
@@ -33,6 +34,8 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
     private SlotCollection _slots;
     private SlotAdapter _adapter;
 
+    private boolean _edited = false;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -92,12 +95,11 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
         findViewById(R.id.button_add_fingerprint).setVisibility(visibility);
     }
 
-    private boolean onSave() {
+    private void onSave() {
         Intent intent = new Intent();
         intent.putExtra("slots", _slots);
         setResult(RESULT_OK, intent);
         finish();
-        return true;
     }
 
     @Override
@@ -105,12 +107,15 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
         switch (item.getItemId()) {
             case android.R.id.home:
                 onBackPressed();
-                return true;
+                break;
             case R.id.action_save:
-                return onSave();
+                onSave();
+                break;
             default:
                 return super.onOptionsItemSelected(item);
         }
+
+        return true;
     }
 
     @Override
@@ -119,6 +124,19 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
         return true;
     }
 
+    @Override
+    public void onBackPressed() {
+        if (!_edited) {
+            super.onBackPressed();
+            return;
+        }
+
+        Dialogs.showDiscardDialog(this,
+                (dialog, which) -> onSave(),
+                (dialog, which) -> super.onBackPressed()
+        );
+    }
+
     @Override
     public void onEditSlot(Slot slot) {
         /*EditText textName = new EditText(this);
@@ -129,6 +147,7 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
                 .setView(textName)
                 .setPositiveButton(android.R.string.ok, (dialog, whichButton) -> {
                     String name = textName.getText().toString();
+                    _edited = true;
                 })
                 .setNegativeButton(android.R.string.cancel, null)
                 .show();*/
@@ -147,6 +166,7 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
                 .setPositiveButton(android.R.string.yes, (dialog, whichButton) -> {
                     _slots.remove(slot);
                     _adapter.removeSlot(slot);
+                    _edited = true;
                     updateFingerprintButton();
                 })
                 .setNegativeButton(android.R.string.no, null)
@@ -164,6 +184,7 @@ public class SlotManagerActivity extends AegisActivity implements SlotAdapter.Li
 
         _slots.add(slot);
         _adapter.addSlot(slot);
+        _edited = true;
         updateFingerprintButton();
     }
 

app/src/main/java/me/impy/aegis/ui/dialogs/Dialogs.java

@@ -4,6 +4,8 @@ import android.app.Activity;
 import android.content.DialogInterface;
 import android.support.v7.app.AlertDialog;
 
+import me.impy.aegis.R;
+
 public class Dialogs {
     private Dialogs() {
 
@@ -17,4 +19,13 @@ public class Dialogs {
                 .setNegativeButton(android.R.string.no, null)
                 .show();
     }
+
+    public static AlertDialog showDiscardDialog(Activity activity, DialogInterface.OnClickListener onSave, DialogInterface.OnClickListener onDiscard) {
+        return new AlertDialog.Builder(activity)
+                .setTitle("Discard changes?")
+                .setMessage("Your changes have not been saved")
+                .setPositiveButton(R.string.save, onSave)
+                .setNegativeButton(R.string.discard, onDiscard)
+                .show();
+    }
 }