src/com/android/car/settings/bluetooth/BluetoothPairingSelectionFragment.java

/*
 * Copyright 2018 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.car.settings.bluetooth;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Context;

import androidx.annotation.VisibleForTesting;

import com.android.car.settings.R;
import com.android.car.settings.common.SettingsFragment;
import com.android.settingslib.bluetooth.BluetoothCallback;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.bluetooth.LocalBluetoothManager;

/**
 * Page which scans for Bluetooth devices so that a user can select a new device to pair. When a
 * device pairs, this page will finish.
 */
public class BluetoothPairingSelectionFragment extends SettingsFragment {

    @VisibleForTesting
    final BluetoothCallback mCallback = new BluetoothCallback() {
        @Override
        public void onBluetoothStateChanged(int bluetoothState) {
            // If bluetooth is turned off, go back since pairing is no longer possible
            if (bluetoothState == BluetoothAdapter.STATE_OFF) {
                goBack();
            }
        }

        @Override
        public void onScanningStateChanged(boolean started) {
        }

        @Override
        public void onDeviceBondStateChanged(CachedBluetoothDevice cachedDevice, int bondState) {
            if (bondState == BluetoothDevice.BOND_BONDED) {
                goBack();
            }
        }
    };

    private LocalBluetoothManager mManager;

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.bluetooth_pairing_selection_fragment;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mManager = BluetoothUtils.getLocalBtManager(context);
        if (mManager == null) {
            goBack();
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        mManager.setForegroundActivity(requireActivity());
        mManager.getEventManager().registerCallback(mCallback);
        getToolbar().getProgressBar().setVisible(true);
    }

    @Override
    public void onStop() {
        super.onStop();
        mManager.setForegroundActivity(null);
        mManager.getEventManager().unregisterCallback(mCallback);
        getToolbar().getProgressBar().setVisible(false);
    }
}