src/com/android/settings/bluetooth/GroupBluetoothDevicesConnectedController.java

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package com.android.settings.bluetooth;

import android.content.Context;
import android.content.pm.PackageManager;

import androidx.preference.PreferenceFragmentCompat;

import androidx.preference.Preference;
import androidx.preference.PreferenceGroup;
import androidx.preference.PreferenceScreen;
import com.android.settings.bluetooth.BluetoothDevicePreference;
import com.android.settings.bluetooth.BluetoothDeviceUpdater;
import com.android.settings.connecteddevice.DevicePreferenceCallback;
import com.android.settings.connecteddevice.dock.DockUpdater;
import com.android.settings.core.BasePreferenceController;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settings.dashboard.DashboardFragment;
import com.android.settings.overlay.DockUpdaterFeatureProvider;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.widget.GearPreference;
import com.android.settings.widget.GearPreference.OnGearClickListener;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;
import com.android.settingslib.core.lifecycle.events.OnResume;

/**
 * Controller to maintain connected Group devices (Connected but not active)
 */
public class GroupBluetoothDevicesConnectedController extends BasePreferenceController
        implements PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop,
        DevicePreferenceCallback {

    private static final String KEY = "group_options_connected_devices";
    private static final String TAG = "GroupBluetoothDevicesConnectedController";
    private PreferenceGroup mPreferenceGroup;
    private GroupBluetoothDevicesConnectedUpdater mGroupDeviceUpdater;
    private int mGroupId;

    public GroupBluetoothDevicesConnectedController(Context context, DashboardFragment fragment,
        Lifecycle lifecycle, int groupid) {
        super(context, KEY);
        mGroupId = groupid;
        lifecycle.addObserver(this);
        mGroupDeviceUpdater = new GroupBluetoothDevicesConnectedUpdater(fragment.getContext(),
                fragment, this, mGroupId);
    }

    @Override
    public void onStart() {
        mGroupDeviceUpdater.registerCallback();
    }

    @Override
    public void onStop() {
        mGroupDeviceUpdater.unregisterCallback();
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        mPreferenceGroup = screen.findPreference(KEY);
        mPreferenceGroup.setVisible(false);
        if (isAvailable()) {
            final Context context = screen.getContext();
            mGroupDeviceUpdater.setPrefContext(context);
            mGroupDeviceUpdater.forceUpdate();
        }
    }

    @Override
    public int getAvailabilityStatus() {
        return (mContext.getPackageManager().hasSystemFeature(
            PackageManager.FEATURE_BLUETOOTH)) ? AVAILABLE  : UNSUPPORTED_ON_DEVICE;
    }

    @Override
    public String getPreferenceKey() {
        return KEY;
    }

    @Override
    public void onDeviceAdded(Preference preference) {
        if (mPreferenceGroup.getPreferenceCount() == 0) {
            mPreferenceGroup.setVisible(true);
        }
        mPreferenceGroup.addPreference(preference);
    }

    @Override
    public void onDeviceRemoved(Preference preference) {
        mPreferenceGroup.removePreference(preference);
        if (mPreferenceGroup.getPreferenceCount() == 0) {
            mPreferenceGroup.setVisible(false);
        }
    }
}