preserve state in KeySpinner, and some lint fixes

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/ui/AccountSettingsFragment.java

@@ -58,7 +58,7 @@ public class AccountSettingsFragment extends Fragment {
         this.mAccSettings = accountSettings;
 
         mAccNameView.setText(accountSettings.getAccountName());
-        mSelectKeySpinner.setSelectedKeyId(accountSettings.getKeyId());
+        mSelectKeySpinner.setPreSelectedKeyId(accountSettings.getKeyId());
     }
 
     /**
@@ -107,7 +107,7 @@ public class AccountSettingsFragment extends Fragment {
                 if (resultCode == Activity.RESULT_OK) {
                     if (data != null && data.hasExtra(OperationResult.EXTRA_RESULT)) {
                         EditKeyResult result = data.getParcelableExtra(OperationResult.EXTRA_RESULT);
-                        mSelectKeySpinner.setSelectedKeyId(result.mMasterKeyId);
+                        mSelectKeySpinner.setPreSelectedKeyId(result.mMasterKeyId);
                     } else {
                         Log.e(Constants.TAG, "missing result!");
                     }

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

@@ -60,7 +60,6 @@ import org.sufficientlysecure.keychain.ui.base.CryptoOperationFragment;
 import org.sufficientlysecure.keychain.ui.dialog.ProgressDialogFragment;
 import org.sufficientlysecure.keychain.ui.util.Notify;
 import org.sufficientlysecure.keychain.ui.widget.CertifyKeySpinner;
-import org.sufficientlysecure.keychain.ui.widget.KeySpinner;
 import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.Preferences;
 
@@ -113,7 +112,7 @@ public class CertifyKeyFragment extends CryptoOperationFragment
             try {
                 CachedPublicKeyRing key = (new ProviderHelper(getActivity())).getCachedPublicKeyRing(certifyKeyId);
                 if (key.canCertify()) {
-                    mCertifyKeySpinner.setSelectedKeyId(certifyKeyId);
+                    mCertifyKeySpinner.setPreSelectedKeyId(certifyKeyId);
                 }
             } catch (PgpKeyNotFoundException e) {
                 Log.e(Constants.TAG, "certify certify check failed", e);

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

@@ -84,12 +84,17 @@ public class EncryptModeAsymmetricFragment extends EncryptModeFragment {
         super.onActivityCreated(savedInstanceState);
         mProviderHelper = new ProviderHelper(getActivity());
 
-        // preselect keys given
+        // preselect keys given, from state or arguments
-        long signatureKeyId = getArguments().getLong(ARG_SINGATURE_KEY_ID);
+        long signatureKeyId, encryptionKeyIds[];
-        long[] encryptionKeyIds = getArguments().getLongArray(ARG_ENCRYPTION_KEY_IDS);
+
+        if (savedInstanceState == null) {
+            signatureKeyId = getArguments().getLong(ARG_SINGATURE_KEY_ID);
+            encryptionKeyIds = getArguments().getLongArray(ARG_ENCRYPTION_KEY_IDS);
             preselectKeys(signatureKeyId, encryptionKeyIds);
         }
 
+    }
+
     /**
      * If an Intent gives a signatureMasterKeyId and/or encryptionMasterKeyIds, preselect those!
      */
@@ -99,7 +104,7 @@ public class EncryptModeAsymmetricFragment extends EncryptModeFragment {
                 CachedPublicKeyRing keyring = mProviderHelper.getCachedPublicKeyRing(
                         KeyRings.buildUnifiedKeyRingUri(signatureKeyId));
                 if (keyring.hasAnySecret()) {
-                    mSignKeySpinner.setSelectedKeyId(signatureKeyId);
+                    mSignKeySpinner.setPreSelectedKeyId(signatureKeyId);
                 }
             } catch (PgpKeyNotFoundException e) {
                 Log.e(Constants.TAG, "key not found!", e);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/CertifyKeySpinner.java

@@ -98,7 +98,7 @@ public class CertifyKeySpinner extends KeySpinner {
             // - there are actually keys (not just "none" entry)
             // Then:
             // - select key that is capable of certifying, but only if there is only one key capable of it
-            if (mSelectedKeyId == Constants.key.none && mAdapter.getCount() > 1) {
+            if (mPreSelectedKeyId == Constants.key.none && mAdapter.getCount() > 1) {
                 // preselect if key can certify
                 int selection = -1;
                 while (data.moveToNext()) {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/KeySpinner.java

@@ -17,6 +17,7 @@
 
 package org.sufficientlysecure.keychain.ui.widget;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.database.Cursor;
 import android.graphics.Color;
@@ -52,13 +53,13 @@ public abstract class KeySpinner extends AppCompatSpinner implements
         LoaderManager.LoaderCallbacks<Cursor> {
 
     public static final String ARG_SUPER_STATE = "super_state";
-    public static final String ARG_SELECTED_KEY_ID = "select_key_id";
+    public static final String ARG_KEY_ID = "key_id";
 
     public interface OnKeyChangedListener {
         void onKeyChanged(long masterKeyId);
     }
 
-    protected long mSelectedKeyId = Constants.key.none;
+    protected long mPreSelectedKeyId = Constants.key.none;
     protected SelectKeyAdapter mAdapter = new SelectKeyAdapter();
     protected OnKeyChangedListener mListener;
 
@@ -85,17 +86,15 @@ public abstract class KeySpinner extends AppCompatSpinner implements
         super.setOnItemSelectedListener(new OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
-                mSelectedKeyId = id;
                 if (mListener != null) {
-                    mListener.onKeyChanged(mSelectedKeyId);
+                    mListener.onKeyChanged(id);
                 }
             }
 
             @Override
             public void onNothingSelected(AdapterView<?> parent) {
-                mSelectedKeyId = Constants.key.none;
                 if (mListener != null) {
-                    mListener.onKeyChanged(mSelectedKeyId);
+                    mListener.onKeyChanged(Constants.key.none);
                 }
             }
         });
@@ -139,11 +138,11 @@ public abstract class KeySpinner extends AppCompatSpinner implements
     }
 
     public long getSelectedKeyId() {
-        return mSelectedKeyId;
+        return getSelectedItemId();
     }
 
-    public void setSelectedKeyId(long selectedKeyId) {
+    public void setPreSelectedKeyId(long selectedKeyId) {
-        mSelectedKeyId = selectedKeyId;
+        mPreSelectedKeyId = selectedKeyId;
     }
 
     protected class SelectKeyAdapter extends BaseAdapter implements SpinnerAdapter {
@@ -232,10 +231,10 @@ public abstract class KeySpinner extends AppCompatSpinner implements
             mIndexMasterKeyId = newCursor.getColumnIndex(KeychainContract.KeyRings.MASTER_KEY_ID);
             mIndexCreationDate = newCursor.getColumnIndex(KeychainContract.KeyRings.CREATION);
 
-            // pre-select key if mSelectedKeyId is given
+            // pre-select key if mPreSelectedKeyId is given
-            if (mSelectedKeyId != Constants.key.none && newCursor.moveToFirst()) {
+            if (mPreSelectedKeyId != Constants.key.none && newCursor.moveToFirst()) {
                 do {
-                    if (newCursor.getLong(mIndexMasterKeyId) == mSelectedKeyId) {
+                    if (newCursor.getLong(mIndexMasterKeyId) == mPreSelectedKeyId) {
                         setSelection(newCursor.getPosition() + 1);
                     }
                 } while (newCursor.moveToNext());
@@ -260,6 +259,7 @@ public abstract class KeySpinner extends AppCompatSpinner implements
             return inner.getItemId(position - 1);
         }
 
+        @SuppressLint("ViewHolder") // inflate call is for the preview only
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             try {
@@ -304,4 +304,26 @@ public abstract class KeySpinner extends AppCompatSpinner implements
         return true;
     }
 
+    @Override
+    public void onRestoreInstanceState(Parcelable state) {
+        Bundle bundle = (Bundle) state;
+
+        mPreSelectedKeyId = bundle.getLong(ARG_KEY_ID);
+
+        // restore super state
+        super.onRestoreInstanceState(bundle.getParcelable(ARG_SUPER_STATE));
+
+    }
+
+    @NonNull
+    @Override
+    public Parcelable onSaveInstanceState() {
+        Bundle bundle = new Bundle();
+
+        // save super state
+        bundle.putParcelable(ARG_SUPER_STATE, super.onSaveInstanceState());
+
+        bundle.putLong(ARG_KEY_ID, getSelectedKeyId());
+        return bundle;
+    }
 }