ImportKeys: Add method for single import

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

@@ -1,11 +1,16 @@
 package org.sufficientlysecure.keychain.keyimport.processing;
 
+import org.sufficientlysecure.keychain.keyimport.ParcelableKeyRing;
 import org.sufficientlysecure.keychain.operations.results.ImportKeyResult;
 
 public interface ImportKeysListener {
 
     void loadKeys(LoaderState loaderState);
+
+    void importKey(ParcelableKeyRing keyRing);
+
     void importKeys();
+
     void handleResult(ImportKeyResult result);
 
 }

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

@@ -336,6 +336,41 @@ public class ImportKeysActivity extends BaseActivity implements ImportKeysListen
         listFragment.loadState(loaderState);
     }
 
+    @Override
+    public void importKey(ParcelableKeyRing keyRing) {
+        FragmentManager fM = getSupportFragmentManager();
+        ImportKeysListFragment listFragment = (ImportKeysListFragment) fM.findFragmentByTag(TAG_FRAG_LIST);
+
+        String keyserver = null;
+        ArrayList<ParcelableKeyRing> keyList = null;
+        LoaderState loaderState = listFragment.getState();
+
+        Log.d(Constants.TAG, "importKey started");
+        if (loaderState instanceof BytesLoaderState) {
+            // instead of giving the entries by Intent extra, cache them into a
+            // file to prevent Java Binder problems on heavy imports
+            // read FileImportCache for more info.
+            try {
+                // We parcel this iteratively into a file - anything we can
+                // display here, we should be able to import.
+                ParcelableFileCache<ParcelableKeyRing> cache =
+                        new ParcelableFileCache<>(this, ImportOperation.CACHE_FILE_NAME);
+                cache.writeCache(keyRing);
+            } catch (IOException e) {
+                Log.e(Constants.TAG, "Problem writing cache file", e);
+                Notify.create(this, "Problem writing cache file!", Notify.Style.ERROR).show();
+                return;
+            }
+        } else if (loaderState instanceof CloudLoaderState) {
+            //TODO
+        }
+
+        ImportKeysOperationCallback callback = new ImportKeysOperationCallback(this, keyserver, keyList);
+        mOperationHelper = new CryptoOperationHelper(1, this, callback, R.string.progress_importing);
+
+        mOperationHelper.cryptoOperation();
+    }
+
     @Override
     public void importKeys() {
         FragmentManager fM = getSupportFragmentManager();
@@ -367,6 +402,7 @@ public class ImportKeysActivity extends BaseActivity implements ImportKeysListen
                 return;
             }
         } else if (loaderState instanceof CloudLoaderState) {
+            //TODO This need to be removed because it makes no sense to import "all" from cloud
             CloudLoaderState sls = (CloudLoaderState) loaderState;
 
             // get selected key entries

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java

@@ -57,7 +57,39 @@ public class ParcelableFileCache<E extends Parcelable> {
     }
 
     public void writeCache(int numEntries, Iterator<E> it) throws IOException {
+        DataOutputStream oos = getOutputStream();
 
+        try {
+            oos.writeInt(numEntries);
+            while (it.hasNext()) {
+                writeParcelable(it.next(), oos);
+            }
+        } finally {
+            oos.close();
+        }
+    }
+
+    public void writeCache(E obj) throws IOException {
+        DataOutputStream oos = getOutputStream();
+
+        try {
+            oos.writeInt(1);
+            writeParcelable(obj, oos);
+        } finally {
+            oos.close();
+        }
+    }
+
+    private void writeParcelable(E obj, DataOutputStream oos) throws IOException {
+        Parcel p = Parcel.obtain(); // creating empty parcel object
+        p.writeParcelable(obj, 0); // saving bundle as parcel
+        byte[] buf = p.marshall();
+        oos.writeInt(buf.length);
+        oos.write(buf);
+        p.recycle();
+    }
+
+    private DataOutputStream getOutputStream() throws IOException {
         File cacheDir = mContext.getCacheDir();
         if (cacheDir == null) {
             // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU
@@ -65,29 +97,12 @@ public class ParcelableFileCache<E extends Parcelable> {
         }
 
         File tempFile = new File(mContext.getCacheDir(), mFilename);
-
-
-        DataOutputStream oos = new DataOutputStream(new FileOutputStream(tempFile));
-
-        try {
-            oos.writeInt(numEntries);
-
-            while (it.hasNext()) {
-                Parcel p = Parcel.obtain(); // creating empty parcel object
-                p.writeParcelable(it.next(), 0); // saving bundle as parcel
-                byte[] buf = p.marshall();
-                oos.writeInt(buf.length);
-                oos.write(buf);
-                p.recycle();
-            }
-        } finally {
-            oos.close();
-        }
-
+        return new DataOutputStream(new FileOutputStream(tempFile));
     }
 
     /**
      * Reads from cache file and deletes it afterward. Convenience function for readCache(boolean).
+     *
      * @return an IteratorWithSize object containing entries read from the cache file
      * @throws IOException
      */
@@ -97,10 +112,11 @@ public class ParcelableFileCache<E extends Parcelable> {
 
     /**
      * Reads entries from a cache file and returns an IteratorWithSize object containing the entries
+     *
      * @param deleteAfterRead if true, the cache file will be deleted after being read
      * @return an IteratorWithSize object containing entries read from the cache file
      * @throws IOException if cache directory/parcel import file does not exist, or a read error
-     * occurs
+     *                     occurs
      */
     public IteratorWithSize<E> readCache(final boolean deleteAfterRead) throws IOException {
 
@@ -205,7 +221,6 @@ public class ParcelableFileCache<E extends Parcelable> {
     }
 
     public boolean delete() throws IOException {
-
         File cacheDir = mContext.getCacheDir();
         if (cacheDir == null) {
             // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU