Ability to clear the configurations.

Author: astonbitecode

java/res/drawable-hdpi/clean.png

@@ -119,6 +119,33 @@
                         android:drawableTop="@drawable/dropbox_circle_black_64"/>
             </GridLayout>
 
+            <GridLayout
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="center"
+                    android:layout_marginTop="20sp"
+                    android:columnCount="1"
+                    android:gravity="center|top"
+                    android:orientation="horizontal">
+
+                <TextView
+                        android:id="@+id/clearConfigurationsLabel"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_gravity="center"
+                        android:text="@string/clear_all_configurations"
+                        android:textAppearance="?android:attr/textAppearanceSmall"/>
+
+                <Button
+                        android:id="@+id/clearConfigurationsButton"
+                        android:layout_marginTop="18sp"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_gravity="center"
+                        android:background="@android:color/transparent"
+                        android:drawableTop="@drawable/clean"/>
+            </GridLayout>
+
             <GridLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"

java/res/drawable-mdpi/clean.png

@@ -5,5 +5,6 @@
     <string name="welcome">Welcome to rust-keylock</string>
     <string name="action_settings">Settings</string>
     <string name="dbx_app_key">7git6ovjwtdbfvm</string>
+    <string name="clear_all_configurations">Clear all configurations</string>
 
 </resources>

java/res/drawable-xhdpi/clean.png

@@ -83,6 +83,13 @@ public void onClick(View view) {
             String appKey = getString(R.string.dbx_app_key);
             Log.d(TAG, "Clicked Get Dropbox token in configuration. App key: " + appKey);
             Auth.startOAuth2Authentication(getActivity(), appKey);
+        } else if (view.getId() == R.id.clearConfigurationsButton) {
+            Log.d(TAG, "Clicked clear configurations in configuration.");
+            nextcloudUrlText.setText("");
+            nextcloudUsernameText.setText("");
+            nextcloudPasswordText.setText("");
+            useSelfSignedCert.setChecked(false);
+            strings.set(5, "");
         }
     }
 
@@ -107,6 +114,8 @@ private void prepareUiElements(View v) {
         cb.setOnClickListener(this);
         Button gt = (Button) v.findViewById(R.id.editConfigurationGetTokenButton);
         gt.setOnClickListener(this);
+        Button cc = (Button) v.findViewById(R.id.clearConfigurationsButton);
+        cc.setOnClickListener(this);
 
         EditText urlText = (EditText) v.findViewById(R.id.editNextcloudUrl);
         urlText.setText(strings.get(0));