Add L2tpIpsecPskEditor.

* Changes
  + Add L2tpIpsecPskEditor.java.
  + Save profile name in VpnEditor to be used in saveSecrets().

src/com/android/settings/vpn/L2tpIpsecPskEditor.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.vpn;
+
+import com.android.settings.R;
+
+import android.content.Context;
+import android.net.vpn.L2tpIpsecPskProfile;
+import android.preference.EditTextPreference;
+import android.preference.Preference;
+import android.preference.PreferenceGroup;
+
+/**
+ * The class for editing {@link L2tpIpsecPskProfile}.
+ */
+class L2tpIpsecPskEditor extends L2tpEditor {
+    private EditTextPreference mPresharedKey;
+
+    public L2tpIpsecPskEditor(L2tpIpsecPskProfile p) {
+        super(p);
+    }
+
+    @Override
+    protected void loadExtraPreferencesTo(PreferenceGroup subpanel) {
+        Context c = subpanel.getContext();
+        subpanel.addPreference(createPresharedKeyPreference(c));
+        super.loadExtraPreferencesTo(subpanel);
+    }
+
+    @Override
+    public String validate() {
+        String result = super.validate();
+
+        return ((result != null)
+                ? result
+                : validate(mPresharedKey, R.string.vpn_ipsec_presharedkey));
+    }
+
+    @Override
+    public void saveSecrets(String originalProfileName) {
+        L2tpIpsecPskProfile profile = (L2tpIpsecPskProfile) getProfile();
+        profile.getPresharedKey();
+        // TODO: fill up the implementation after keystore is available
+    }
+
+    private Preference createPresharedKeyPreference(Context c) {
+        final L2tpIpsecPskProfile profile = (L2tpIpsecPskProfile) getProfile();
+        mPresharedKey = createSecretPreference(c,
+                R.string.vpn_ipsec_presharedkey_title,
+                R.string.vpn_ipsec_presharedkey,
+                profile.getPresharedKey(),
+                new Preference.OnPreferenceChangeListener() {
+                    public boolean onPreferenceChange(
+                            Preference pref, Object newValue) {
+                        profile.setPresharedKey((String) newValue);
+                        setSecretSummary(mPresharedKey,
+                                R.string.vpn_ipsec_presharedkey,
+                                (String) newValue);
+                        return true;
+                    }
+                });
+        return mPresharedKey;
+    }
+}