Add nfc preference controller.

Update connected devices and wireless setting to use the nfc
preference controller for displaying the nfc and bean settings.

Test: RunSettingsRoboTests
Bug: 31800290
Change-Id: I06eee6b7bfe1d8b767216198bd37f1c79e53d992

src/com/android/settings/nfc/NfcPreferenceController.java

@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2016 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.nfc;
+
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.nfc.NfcAdapter;
+import android.nfc.NfcManager;
+import android.os.Handler;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnPause;
+import com.android.settings.core.lifecycle.events.OnResume;
+import com.android.settings.network.AirplaneModePreferenceController;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settingslib.RestrictedPreference;
+
+import java.util.List;
+
+public class NfcPreferenceController extends PreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
+
+    private static final String KEY_TOGGLE_NFC = "toggle_nfc";
+    private static final String KEY_ANDROID_BEAM_SETTINGS = "android_beam_settings";
+
+    private NfcEnabler mNfcEnabler;
+    private NfcAdapter mNfcAdapter;
+    private final Handler mHandler = new Handler();
+    private int mAirplaneMode;
+    private AirplaneModeObserver mAirplaneModeObserver;
+    private SwitchPreference mNfcPreference;
+    private RestrictedPreference mBeamPreference;
+
+    public NfcPreferenceController(Context context) {
+        super(context);
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        if (!isAvailable()) {
+            removePreference(screen, KEY_TOGGLE_NFC);
+            removePreference(screen, KEY_ANDROID_BEAM_SETTINGS);
+            mNfcEnabler = null;
+            return;
+        }
+        mNfcPreference = (SwitchPreference) screen.findPreference(KEY_TOGGLE_NFC);
+        mBeamPreference = (RestrictedPreference) screen.findPreference(
+                KEY_ANDROID_BEAM_SETTINGS);
+        mNfcEnabler = new NfcEnabler(mContext, mNfcPreference, mBeamPreference);
+        String toggleable = Settings.Global.getString(mContext.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        final boolean useNewIA = FeatureFactory.getFactory(mContext)
+                .getDashboardFeatureProvider(mContext).isEnabled();
+        // Manually set dependencies for NFC when not toggleable.
+        if (toggleable == null || !toggleable.contains(Settings.Global.RADIO_NFC)) {
+            if (useNewIA) {
+                mAirplaneModeObserver = new AirplaneModeObserver();
+                updateNfcPreference();
+            } else {
+                mNfcPreference.setDependency(AirplaneModePreferenceController.KEY_TOGGLE_AIRPLANE);
+                mBeamPreference.setDependency(AirplaneModePreferenceController.KEY_TOGGLE_AIRPLANE);
+            }
+        }
+    }
+
+    @Override
+    public void updateNonIndexableKeys(List<String> keys) {
+        final NfcManager manager = (NfcManager) mContext.getSystemService(Context.NFC_SERVICE);
+        if (manager != null) {
+            NfcAdapter adapter = manager.getDefaultAdapter();
+            if (adapter == null) {
+                keys.add(KEY_TOGGLE_NFC);
+                keys.add(KEY_ANDROID_BEAM_SETTINGS);
+            }
+        }
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    protected boolean isAvailable() {
+        return mNfcAdapter != null;
+    }
+
+    @Override
+    protected String getPreferenceKey() {
+        return null;
+    }
+
+    public void onResume() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.register();
+        }
+        if (mNfcEnabler != null) {
+            mNfcEnabler.resume();
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.unregister();
+        }
+        if (mNfcEnabler != null) {
+            mNfcEnabler.pause();
+        }
+    }
+
+    private void updateNfcPreference() {
+        final int airplaneMode = Settings.Global.getInt(
+                mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, mAirplaneMode);
+        if (airplaneMode == mAirplaneMode) {
+            return;
+        }
+        mAirplaneMode = airplaneMode;
+        boolean toggleable = mAirplaneMode != 1;
+        if (toggleable) {
+            mNfcAdapter.enable();
+        } else {
+            mNfcAdapter.disable();
+        }
+        mNfcPreference.setEnabled(toggleable);
+        mBeamPreference.setEnabled(toggleable);
+    }
+
+    private final class AirplaneModeObserver extends ContentObserver {
+        private final Uri AIRPLANE_MODE_URI =
+                Settings.Global.getUriFor(Settings.Global.AIRPLANE_MODE_ON);
+
+        private AirplaneModeObserver() {
+            super(mHandler);
+        }
+
+        public void register() {
+            mContext.getContentResolver().registerContentObserver(AIRPLANE_MODE_URI, false, this);
+        }
+
+        public void unregister() {
+            mContext.getContentResolver().unregisterContentObserver(this);
+        }
+
+        @Override
+        public void onChange(boolean selfChange, Uri uri) {
+            super.onChange(selfChange, uri);
+            updateNfcPreference();
+        }
+    }
+
+}