1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.car.dialer.bluetooth; 18 19 import android.bluetooth.BluetoothAdapter; 20 import android.content.BroadcastReceiver; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.content.IntentFilter; 24 25 import androidx.annotation.Nullable; 26 import androidx.lifecycle.LiveData; 27 28 import com.android.car.dialer.log.L; 29 30 import javax.inject.Inject; 31 import javax.inject.Singleton; 32 33 import dagger.hilt.android.qualifiers.ApplicationContext; 34 35 /** 36 * Provides the device Bluetooth availability. Updates client with {@link BluetoothState}. 37 */ 38 @Singleton 39 class BluetoothStateLiveData extends LiveData<Integer> { 40 private static final String TAG = "CD.BluetoothStateLiveData"; 41 42 private final BluetoothAdapter mBluetoothAdapter; 43 private final Context mContext; 44 private final IntentFilter mIntentFilter = new IntentFilter(); 45 46 private BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() { 47 @Override 48 public void onReceive(Context context, Intent intent) { 49 updateState(); 50 } 51 }; 52 53 /** Creates a new {@link BluetoothStateLiveData}. Call on main thread. */ 54 @Inject BluetoothStateLiveData( @pplicationContext Context context, @Nullable BluetoothAdapter bluetoothAdapter)55 BluetoothStateLiveData( 56 @ApplicationContext Context context, 57 @Nullable BluetoothAdapter bluetoothAdapter) { 58 mContext = context; 59 mBluetoothAdapter = bluetoothAdapter; 60 mIntentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); 61 } 62 63 @Override onActive()64 protected void onActive() { 65 if (mBluetoothAdapter != null) { 66 updateState(); 67 mContext.registerReceiver(mBluetoothStateReceiver, mIntentFilter); 68 } 69 } 70 71 @Override onInactive()72 protected void onInactive() { 73 if (mBluetoothAdapter != null) { 74 mContext.unregisterReceiver(mBluetoothStateReceiver); 75 } 76 } 77 updateState()78 private void updateState() { 79 @BluetoothState int state = BluetoothState.UNKNOWN; 80 if (mBluetoothAdapter != null) { 81 state = mBluetoothAdapter.isEnabled() ? BluetoothState.ENABLED 82 : BluetoothState.DISABLED; 83 } 84 85 if (getValue() == null || state != getValue()) { 86 L.d(TAG, "updateState to %s", state); 87 setValue(state); 88 } 89 } 90 } 91