sdk: Introduce LineagePreferenceLib

Because of some nested dependency breakage, we can no longer include
Android libraries in main SDK lib, therefore we are moving all
preference related code to a separate package that Settings/LineageParts
will depend on.

Change-Id: Iea379a580a08ea13f71e3503aa096ba0ed7e7cef

packages/LineagePreferenceLib/java/lineageos/preference/SelfRemovingPreference.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2016 The CyanogenMod 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 lineageos.preference;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
+
+/**
+ * A Preference which can automatically remove itself from the hierarchy
+ * based on constraints set in XML.
+ */
+public class SelfRemovingPreference extends Preference {
+
+    private final ConstraintsHelper mConstraints;
+
+    public SelfRemovingPreference(Context context, AttributeSet attrs,
+                                  int defStyle, int defStyleRes) {
+        super(context, attrs, defStyle, defStyleRes);
+        mConstraints = new ConstraintsHelper(context, attrs, this);
+    }
+
+    public SelfRemovingPreference(Context context, AttributeSet attrs, int defStyle) {
+        this(context, attrs, defStyle, 0);
+    }
+
+    public SelfRemovingPreference(Context context, AttributeSet attrs) {
+        this(context, attrs, ConstraintsHelper.getAttr(context,
+                androidx.preference.R.attr.preferenceStyle,
+                android.R.attr.preferenceStyle));
+    }
+
+    public SelfRemovingPreference(Context context) {
+        this(context, null);
+    }
+
+    @Override
+    public void onAttached() {
+        super.onAttached();
+        mConstraints.onAttached();
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        mConstraints.onBindViewHolder(holder);
+    }
+
+    public void setAvailable(boolean available) {
+        mConstraints.setAvailable(available);
+    }
+
+    public boolean isAvailable() {
+        return mConstraints.isAvailable();
+    }
+}