Refactor nfc preference controller

- Remove BaseNfcPreferenceController.
- NfcPreferenceController inherit from TogglePreferenceController.
- AndroidBeamPreferenceController inherit from BasePreferenceController.
- Override getIntentFilter in NfcPreferenceController to listen changes.
- Add an API (hasAsyncUpdate) into BasePreferenceController to
distinguish the setting which is updated asynchronously.

Change-Id: I7c9c48ea7f1ad01a02524beabf9d30baa3db891f
Fixes: 67997761
Fixes: 74887543
Test: RunSettingsRoboTests

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

@@ -16,35 +16,118 @@
 package com.android.settings.nfc;
 
 import android.content.Context;
+import android.content.IntentFilter;
+import android.nfc.NfcAdapter;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 import androidx.preference.SwitchPreference;
 
-import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.core.TogglePreferenceController;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
 import com.android.settingslib.core.lifecycle.events.OnResume;
 
+import java.util.List;
 
-public class NfcPreferenceController extends BaseNfcPreferenceController {
+public class NfcPreferenceController extends TogglePreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
 
     public static final String KEY_TOGGLE_NFC = "toggle_nfc";
+    private final NfcAdapter mNfcAdapter;
+    private NfcEnabler mNfcEnabler;
+    private NfcAirplaneModeObserver mAirplaneModeObserver;
 
-    public NfcPreferenceController(Context context) {
-        super(context);
+    public NfcPreferenceController(Context context, String key) {
+        super(context, key);
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
     }
 
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
         if (!isAvailable()) {
+            mNfcEnabler = null;
             return;
         }
 
-        mNfcEnabler = new NfcEnabler(mContext, (SwitchPreference) mPreference);
+        final SwitchPreference switchPreference =
+                (SwitchPreference) screen.findPreference(getPreferenceKey());
+
+        mNfcEnabler = new NfcEnabler(mContext, switchPreference);
+
+        // Manually set dependencies for NFC when not toggleable.
+        if (!isToggleableInAirplaneMode(mContext)) {
+            mAirplaneModeObserver = new NfcAirplaneModeObserver(mContext,
+                    mNfcAdapter, (Preference) switchPreference);
+        }
     }
 
     @Override
-    public String getPreferenceKey() {
-        return KEY_TOGGLE_NFC;
+    public boolean isChecked() {
+        return mNfcAdapter.isEnabled();
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        if (isChecked) {
+            mNfcAdapter.enable();
+        } else {
+            mNfcAdapter.disable();
+        }
+        return true;
+    }
+
+    @Override
+    @AvailabilityStatus
+    public int getAvailabilityStatus() {
+        return mNfcAdapter != null
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public IntentFilter getIntentFilter() {
+        final IntentFilter filter = new IntentFilter();
+        filter.addAction(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
+        filter.addAction(NfcAdapter.EXTRA_ADAPTER_STATE);
+        return filter;
+    }
+
+    @Override
+    public boolean hasAsyncUpdate() {
+        return true;
+    }
+
+    @Override
+    public boolean isSliceable() {
+        return true;
+    }
+
+    @Override
+    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();
+        }
+    }
+
+    public static boolean isToggleableInAirplaneMode(Context context) {
+        final String toggleable = Settings.Global.getString(context.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        return toggleable != null && toggleable.contains(Settings.Global.RADIO_NFC);
     }
 }