vpn2: show third-party VPN services

VPN apps are shown alongside configured VPNs now. The requirement that
a password is set is now only enforced when setting up a configured
VPN as this is not necessary for apps.

Some UI redesign.

Bug: 19573824
Bug: 17474682
Bug: 19575658
Change-Id: I02bd977136929647d65b9784fb4cc5df24b45428

src/com/android/settings/vpn2/ManageablePreference.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 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.vpn2;
+
+import android.content.Context;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.View.OnClickListener;
+
+import com.android.settings.R;
+
+/**
+ * Preference with an additional gear icon. Touching the gear icon triggers an
+ * onChange event.
+ */
+public class ManageablePreference extends Preference {
+    OnClickListener mListener;
+    View mManageView;
+
+    public ManageablePreference(Context context, AttributeSet attrs, OnClickListener onManage) {
+        super(context, attrs);
+        mListener = onManage;
+        setPersistent(false);
+        setOrder(0);
+        setWidgetLayoutResource(R.layout.preference_vpn);
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        mManageView = view.findViewById(R.id.manage);
+        mManageView.setOnClickListener(mListener);
+        mManageView.setTag(this);
+        super.onBindView(view);
+    }
+}