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.livedata; 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.IntDef; 26 import androidx.lifecycle.LiveData; 27 28 import com.android.car.dialer.log.L; 29 30 /** 31 * Provides the device Bluetooth availability. Updates client with {@link BluetoothState}. 32 */ 33 public class BluetoothStateLiveData extends LiveData<Integer> { 34 private static final String TAG = "CD.BluetoothStateLiveData"; 35 36 @IntDef({ 37 BluetoothState.UNKNOWN, 38 BluetoothState.DISABLED, 39 BluetoothState.ENABLED, 40 }) 41 public @interface BluetoothState { 42 /** Bluetooth is not supported on the current device */ 43 int UNKNOWN = 0; 44 /** Bluetooth is disabled */ 45 int DISABLED = 1; 46 /** Bluetooth is enabled */ 47 int ENABLED = 2; 48 } 49 50 private final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 51 private final Context mContext; 52 private final IntentFilter mIntentFilter = new IntentFilter(); 53 54 private BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() { 55 @Override 56 public void onReceive(Context context, Intent intent) { 57 updateState(); 58 } 59 }; 60 61 /** Creates a new {@link BluetoothStateLiveData}. Call on main thread. */ BluetoothStateLiveData(Context context)62 public BluetoothStateLiveData(Context context) { 63 mContext = context; 64 mIntentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); 65 } 66 67 @Override onActive()68 protected void onActive() { 69 if (mBluetoothAdapter != null) { 70 updateState(); 71 mContext.registerReceiver(mBluetoothStateReceiver, mIntentFilter); 72 } 73 74 } 75 76 @Override onInactive()77 protected void onInactive() { 78 if (mBluetoothAdapter != null) { 79 mContext.unregisterReceiver(mBluetoothStateReceiver); 80 } 81 } 82 updateState()83 private void updateState() { 84 @BluetoothState int state = BluetoothState.UNKNOWN; 85 if (mBluetoothAdapter != null) { 86 state = mBluetoothAdapter.isEnabled() ? BluetoothState.ENABLED 87 : BluetoothState.DISABLED; 88 } 89 90 if (getValue() == null || state != getValue()) { 91 L.d(TAG, "updateState to %s", state); 92 setValue(state); 93 } 94 } 95 } 96