Display a list of feature flags

Bug: 36222960
Test: robotests
Change-Id: I31fbe7f4d42e72846aa4f025ebcf8ea8a1b6d2fd

src/com/android/settings/development/featureflags/FeatureFlagPreference.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2017 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.development.featureflags;
+
+import android.content.Context;
+import android.support.v14.preference.SwitchPreference;
+import android.util.FeatureFlagUtils;
+
+public class FeatureFlagPreference extends SwitchPreference {
+
+    private final String mKey;
+
+    public FeatureFlagPreference(Context context, String key) {
+        super(context);
+        mKey = key;
+        setKey(key);
+        setTitle(key);
+        setCheckedInternal(FeatureFlagUtils.isEnabled(mKey));
+    }
+
+    @Override
+    public void setChecked(boolean isChecked) {
+        setCheckedInternal(isChecked);
+        FeatureFlagUtils.setEnabled(mKey, isChecked);
+    }
+
+    private void setCheckedInternal(boolean isChecked) {
+        super.setChecked(isChecked);
+        setSummary(Boolean.toString(isChecked));
+    }
+}