1 /* 2 * Copyright (C) 2017 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.settings.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 import android.os.Handler; 25 import android.support.annotation.VisibleForTesting; 26 import android.util.Log; 27 28 import com.android.settingslib.bluetooth.LocalBluetoothAdapter; 29 30 import java.util.Timer; 31 import java.util.TimerTask; 32 33 /** Helper class, intended to be used by an Activity, to keep the local Bluetooth adapter in 34 * discoverable mode indefinitely. By default setting the scan mode to 35 * BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE will time out after some time, but some 36 * Bluetooth settings pages would like to keep the device discoverable as long as the page is 37 * visible. */ 38 public class AlwaysDiscoverable extends BroadcastReceiver { 39 private static final String TAG = "AlwaysDiscoverable"; 40 41 private Context mContext; 42 private LocalBluetoothAdapter mLocalAdapter; 43 private IntentFilter mIntentFilter; 44 45 @VisibleForTesting 46 boolean mStarted; 47 AlwaysDiscoverable(Context context, LocalBluetoothAdapter localAdapter)48 public AlwaysDiscoverable(Context context, LocalBluetoothAdapter localAdapter) { 49 mContext = context; 50 mLocalAdapter = localAdapter; 51 mIntentFilter = new IntentFilter(); 52 mIntentFilter.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED); 53 } 54 55 /** After calling start(), consumers should make a matching call to stop() when they no longer 56 * wish to enforce discoverable mode. */ start()57 public void start() { 58 if (mStarted) { 59 return; 60 } 61 mContext.registerReceiver(this, mIntentFilter); 62 mStarted = true; 63 if (mLocalAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { 64 mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE); 65 } 66 } 67 stop()68 public void stop() { 69 if (!mStarted) { 70 return; 71 } 72 mContext.unregisterReceiver(this); 73 mStarted = false; 74 mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE); 75 } 76 77 @Override onReceive(Context context, Intent intent)78 public void onReceive(Context context, Intent intent) { 79 String action = intent.getAction(); 80 if (action != BluetoothAdapter.ACTION_SCAN_MODE_CHANGED) { 81 return; 82 } 83 if (mLocalAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { 84 mLocalAdapter.setScanMode(BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE); 85 } 86 } 87 } 88