some cleanup and documentation

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/ProviderHelper.java

@@ -26,6 +26,7 @@ import android.content.OperationApplicationException;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.RemoteException;
+import android.support.annotation.NonNull;
 import android.support.v4.util.LongSparseArray;
 
 import org.spongycastle.bcpg.CompressionAlgorithmTags;
@@ -725,7 +726,7 @@ public class ProviderHelper {
         LongSparseArray<WrappedSignature> trustedCerts = new LongSparseArray<>();
 
         @Override
-        public int compareTo(UserPacketItem o) {
+        public int compareTo(@NonNull UserPacketItem o) {
             // revoked keys always come last!
             //noinspection DoubleNegation
             if ((selfRevocation != null) != (o.selfRevocation != null)) {
@@ -1126,6 +1127,7 @@ public class ProviderHelper {
                 }
 
             });
+            cursor.close();
 
         } catch (IOException e) {
             Log.e(Constants.TAG, "error saving secret", e);
@@ -1187,6 +1189,7 @@ public class ProviderHelper {
                 }
 
             });
+            cursor.close();
 
         } catch (IOException e) {
             Log.e(Constants.TAG, "error saving public", e);

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

@@ -23,6 +23,7 @@ import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentActivity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -385,14 +386,18 @@ public class CreateKeyFinalFragment extends Fragment {
             }
 
             public void handleResult(ExportResult result) {
-                // TODO: ExportOperation UPLOAD_KEYSERVER needs logs!
+                Activity activity = getActivity();
-                // TODO: then merge logs here!
+                if (activity == null) {
-                //saveKeyResult.getLog().add(result, 0);
+                    return;
+                }
+
+                saveKeyResult.getLog().add(result, 0);
 
                 Intent data = new Intent();
                 data.putExtra(OperationResult.EXTRA_RESULT, saveKeyResult);
-                getActivity().setResult(Activity.RESULT_OK, data);
+                activity.setResult(Activity.RESULT_OK, data);
-                getActivity().finish();
+                activity.finish();
+
             }
 
             @Override

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

@@ -210,7 +210,7 @@ public class ViewKeyYubiKeyFragment
     }
 
     @Override
-    protected void onCryptoOperationResult(PromoteKeyResult result) {
+    public void onCryptoOperationSuccess(PromoteKeyResult result) {
         result.createNotify(getActivity()).show();
     }
 }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/base/CryptoOperationFragment.java

@@ -20,56 +20,88 @@ package org.sufficientlysecure.keychain.ui.base;
 
 import android.content.Intent;
 import android.os.Parcelable;
+import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 
 import org.sufficientlysecure.keychain.operations.results.OperationResult;
+import org.sufficientlysecure.keychain.service.KeychainService;
 import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
 
-/**
+/** This is a base class for fragments which implement a cryptoOperation.
- * All fragments executing crypto operations need to extend this class.
+ *
+ * Subclasses of this class can call the cryptoOperation method to execute an
+ * operation in KeychainService which takes a parcelable of type T as its input
+ * and returns an OperationResult of type S as a result.
+ *
+ * The input (of type T) is not given directly to the cryptoOperation method,
+ * but must be provided by the overriden createOperationInput method to be
+ * available upon request during execution of the cryptoOperation.
+ *
+ * After running cryptoOperation, one of the onCryptoOperation*() methods will
+ * be called, depending on the success status of the operation. The subclass
+ * must override at least onCryptoOperationSuccess to proceed after a
+ * successful operation.
+ *
+ * @see KeychainService
+ *
  */
 public abstract class CryptoOperationFragment<T extends Parcelable, S extends OperationResult>
         extends Fragment implements CryptoOperationHelper.Callback<T, S> {
 
-    private CryptoOperationHelper<T, S> mOperationHelper;
+    final private CryptoOperationHelper<T, S> mOperationHelper;
 
     public CryptoOperationFragment() {
 
         mOperationHelper = new CryptoOperationHelper<>(this, this);
     }
 
-    public void setProgressMessageResource(int id) {
-        mOperationHelper.setProgressMessageResource(id);
-    }
-
-
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         mOperationHelper.handleActivityResult(requestCode, resultCode, data);
     }
 
-    @Override
+    /** Starts execution of the cryptographic operation.
-    public abstract T createOperationInput();
+     *
-
+     * During this process, the createOperationInput() method will be called,
+     * this input will be handed to KeychainService, where it is executed in
+     * the appropriate *Operation class. If the result is a PendingInputResult,
+     * it is handled accordingly. Otherwise, it is returned in one of the
+     * onCryptoOperation* callbacks.
+     */
     protected void cryptoOperation() {
-        cryptoOperation(new CryptoInputParcel());
+        mOperationHelper.cryptoOperation();
     }
 
     protected void cryptoOperation(CryptoInputParcel cryptoInput) {
-        cryptoOperation(cryptoInput, true);
+        mOperationHelper.cryptoOperation(cryptoInput);
     }
 
     protected void cryptoOperation(CryptoInputParcel cryptoInput, boolean showProgress) {
         mOperationHelper.cryptoOperation(cryptoInput, showProgress);
     }
 
+    @Override @Nullable
+    /** Creates input for the crypto operation. Called internally after the
+     * crypto operation is started by a call to cryptoOperation(). Silently
+     * cancels operation if this method returns null. */
+    public abstract T createOperationInput();
+
+    /** Returns false, indicating that we did not handle progress ourselves. */
     public boolean onCryptoSetProgress(String msg, int progress, int max) {
         return false;
     }
 
+    public void setProgressMessageResource(int id) {
+        mOperationHelper.setProgressMessageResource(id);
+    }
+
+    @Override
+    /** Called when the cryptoOperation() was successful. No default behavior
+     * here, this should always be implemented by a subclass! */
+    abstract public void onCryptoOperationSuccess(S result);
+
     @Override
     public void onCryptoOperationError(S result) {
-        onCryptoOperationResult(result);
         result.createNotify(getActivity()).show();
     }
 
@@ -77,19 +109,4 @@ public abstract class CryptoOperationFragment<T extends Parcelable, S extends Op
     public void onCryptoOperationCancelled() {
     }
 
-    @Override
-    public void onCryptoOperationSuccess(S result) {
-        onCryptoOperationResult(result);
-    }
-
-    /**
-     * To be overriden by subclasses, if desired. Provides a way to access the method by the
-     * same name in CryptoOperationHelper, if super.onCryptoOperationSuccess and
-     * super.onCryptoOperationError are called at the start of the respective functions in the
-     * subclass overriding them
-     *
-     * @param result
-     */
-    protected void onCryptoOperationResult(S result) {
-    }
 }

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/base/CryptoOperationHelper.java

@@ -84,8 +84,6 @@ public class CryptoOperationHelper<T extends Parcelable, S extends OperationResu
 
     /**
      * If OperationHelper is being integrated into an activity
-     *
-     * @param activity
      */
     public CryptoOperationHelper(FragmentActivity activity, Callback<T, S> callback, int progressMessageString) {
         mActivity = activity;
@@ -96,8 +94,6 @@ public class CryptoOperationHelper<T extends Parcelable, S extends OperationResu
 
     /**
      * if OperationHelper is being integrated into a fragment
-     *
-     * @param fragment
      */
     public CryptoOperationHelper(Fragment fragment, Callback<T, S> callback, int progressMessageString) {
         mFragment = fragment;
@@ -108,8 +104,6 @@ public class CryptoOperationHelper<T extends Parcelable, S extends OperationResu
 
     /**
      * if OperationHelper is being integrated into a fragment with default message for the progress dialog
-     *
-     * @param fragment
      */
     public CryptoOperationHelper(Fragment fragment, Callback<T, S> callback) {
         mFragment = fragment;
@@ -178,10 +172,6 @@ public class CryptoOperationHelper<T extends Parcelable, S extends OperationResu
     /**
      * Attempts the result of an activity started by this helper. Returns true if requestCode is
      * recognized, false otherwise.
-     *
-     * @param requestCode
-     * @param resultCode
-     * @param data
      * @return true if requestCode was recognized, false otherwise
      */
     public boolean handleActivityResult(int requestCode, int resultCode, Intent data) {