save instance state in DecryptListFragment

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

@@ -0,0 +1,63 @@
+package org.sufficientlysecure.keychain.util;
+
+
+import java.util.HashMap;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.support.annotation.NonNull;
+
+import org.sufficientlysecure.keychain.KeychainApplication;
+
+
+public class ParcelableHashMap <K extends Parcelable, V extends Parcelable> implements Parcelable {
+
+    HashMap<K,V> mInner;
+
+    public ParcelableHashMap(HashMap<K,V> inner) {
+        mInner = inner;
+    }
+
+    protected ParcelableHashMap(@NonNull Parcel in) {
+        mInner = new HashMap<>();
+        ClassLoader loader = KeychainApplication.class.getClassLoader();
+
+        int num = in.readInt();
+        while (num-- > 0) {
+            K key = in.readParcelable(loader);
+            V val = in.readParcelable(loader);
+            mInner.put(key, val);
+        }
+    }
+
+    public HashMap<K,V> getMap() {
+        return mInner;
+    }
+
+    @Override
+    public void writeToParcel(Parcel parcel, int flags) {
+        parcel.writeInt(mInner.size());
+        for (HashMap.Entry<K,V> entry : mInner.entrySet()) {
+            parcel.writeParcelable(entry.getKey(), 0);
+            parcel.writeParcelable(entry.getValue(), 0);
+        }
+    }
+
+    public static final Creator<ParcelableHashMap> CREATOR = new Creator<ParcelableHashMap>() {
+        @Override
+        public ParcelableHashMap createFromParcel(Parcel in) {
+            return new ParcelableHashMap(in);
+        }
+
+        @Override
+        public ParcelableHashMap[] newArray(int size) {
+            return new ParcelableHashMap[size];
+        }
+    };
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+}