ImportKeys: Add possibility to go back to single card

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/processing/LoaderState.java

@@ -2,6 +2,12 @@ package org.sufficientlysecure.keychain.keyimport.processing;
 
 public interface LoaderState {
 
+    /**
+     * Basic mode includes ability to import all keys retrieved from the selected source
+     * This doesn't make sense for all sources (for example keyservers..)
+     *
+     * @return if currently selected source supports basic mode
+     */
     boolean isBasicModeSupported();
 
 }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysActivity.java

@@ -311,12 +311,21 @@ public class ImportKeysActivity extends BaseActivity implements ImportKeysListen
         super.onActivityResult(requestCode, resultCode, data);
     }
 
+    @Override
+    public void onBackPressed() {
+        FragmentManager fM = getSupportFragmentManager();
+        ImportKeysListFragment listFragment =
+                (ImportKeysListFragment) fM.findFragmentByTag(TAG_FRAG_LIST);
+
+        if ((listFragment == null) || listFragment.onBackPressed()) {
+            super.onBackPressed();
+        }
+    }
+
     @Override
     public void loadKeys(LoaderState loaderState) {
         FragmentManager fM = getSupportFragmentManager();
-        ImportKeysListFragment listFragment = (ImportKeysListFragment) fM.findFragmentByTag(TAG_FRAG_LIST);
-
-        listFragment.loadState(loaderState);
+        ((ImportKeysListFragment) fM.findFragmentByTag(TAG_FRAG_LIST)).loadState(loaderState);
     }
 
     @Override

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ImportKeysListFragment.java

@@ -210,6 +210,21 @@ public class ImportKeysListFragment extends Fragment implements
         }
     }
 
+    /**
+     * User may want to go back to single card view if he's now in full key list
+     * Check if we are in full key list and if this import operation supports basic mode
+     *
+     * @return true if activity's back pressed can be performed
+     */
+    public boolean onBackPressed() {
+        boolean advanced = mBinding.getAdvanced();
+        if (advanced && mLoaderState.isBasicModeSupported()) {
+            mBinding.setAdvanced(false);
+            return false;
+        }
+        return true;
+    }
+
     public void loadState(LoaderState loaderState) {
         mLoaderState = loaderState;
 
@@ -263,8 +278,7 @@ public class ImportKeysListFragment extends Fragment implements
     @Override
     public void onLoadFinished(
             Loader<AsyncTaskResultWrapper<ArrayList<ImportKeysListEntry>>> loader,
-            AsyncTaskResultWrapper<ArrayList<ImportKeysListEntry>> data
-    ) {
+            AsyncTaskResultWrapper<ArrayList<ImportKeysListEntry>> data) {
 
         mAdapter.setData(data.getResult());
         int size = mAdapter.getItemCount();
@@ -329,8 +343,6 @@ public class ImportKeysListFragment extends Fragment implements
                     getKeyResult.createNotify(mActivity).show();
                 }
                 break;
-            default:
-                break;
         }
     }