1/* 2 * Copyright (C) 2014 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 17package com.android.services.telephony; 18 19import android.content.Context; 20import android.content.Intent; 21import android.os.UserHandle; 22import android.provider.Settings; 23import android.telephony.TelephonyManager; 24 25import com.android.internal.telephony.Phone; 26import com.android.internal.telephony.PhoneFactory; 27 28import java.util.ArrayList; 29import java.util.HashSet; 30import java.util.List; 31 32/** 33 * Helper class that implements special behavior related to emergency calls or making phone calls 34 * when the radio is in the POWER_OFF STATE. Specifically, this class handles the case of the user 35 * trying to dial an emergency number while the radio is off (i.e. the device is in airplane mode) 36 * or a normal number while the radio is off (because of the device is on Bluetooth), by turning the 37 * radio back on, waiting for it to come up, and then retrying the call. 38 */ 39public class RadioOnHelper implements RadioOnStateListener.Callback { 40 41 private final Context mContext; 42 private RadioOnStateListener.Callback mCallback; 43 private List<RadioOnStateListener> mListeners; 44 private List<RadioOnStateListener> mInProgressListeners; 45 private boolean mIsRadioOnCallingEnabled; 46 47 public RadioOnHelper(Context context) { 48 mContext = context; 49 mInProgressListeners = new ArrayList<>(2); 50 } 51 52 private void setupListeners() { 53 if (mListeners != null) { 54 return; 55 } 56 mListeners = new ArrayList<>(2); 57 for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) { 58 mListeners.add(new RadioOnStateListener()); 59 } 60 } 61 /** 62 * Starts the "turn on radio" sequence. This is the (single) external API of the 63 * RadioOnHelper class. 64 * 65 * This method kicks off the following sequence: 66 * - Power on the radio for each Phone 67 * - Listen for radio events telling us the radio has come up. 68 * - Retry if we've gone a significant amount of time without any response from the radio. 69 * - Finally, clean up any leftover state. 70 * 71 * This method is safe to call from any thread, since it simply posts a message to the 72 * RadioOnHelper's handler (thus ensuring that the rest of the sequence is entirely 73 * serialized, and runs on the main looper.) 74 */ 75 public void triggerRadioOnAndListen(RadioOnStateListener.Callback callback) { 76 setupListeners(); 77 mCallback = callback; 78 mInProgressListeners.clear(); 79 mIsRadioOnCallingEnabled = false; 80 for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) { 81 Phone phone = PhoneFactory.getPhone(i); 82 if (phone == null) { 83 continue; 84 } 85 86 mInProgressListeners.add(mListeners.get(i)); 87 mListeners.get(i).waitForRadioOn(phone, this); 88 } 89 90 powerOnRadio(); 91 } 92 /** 93 * Attempt to power on the radio (i.e. take the device out of airplane mode). We'll eventually 94 * get an onServiceStateChanged() callback when the radio successfully comes up. 95 */ 96 private void powerOnRadio() { 97 Log.d(this, "powerOnRadio()."); 98 99 // If airplane mode is on, we turn it off the same way that the Settings activity turns it 100 // off. 101 if (Settings.Global.getInt(mContext.getContentResolver(), 102 Settings.Global.AIRPLANE_MODE_ON, 0) > 0) { 103 Log.d(this, "==> Turning off airplane mode."); 104 105 // Change the system setting 106 Settings.Global.putInt(mContext.getContentResolver(), 107 Settings.Global.AIRPLANE_MODE_ON, 0); 108 109 // Post the broadcast intend for change in airplane mode 110 // TODO: We really should not be in charge of sending this broadcast. 111 // If changing the setting is sufficient to trigger all of the rest of the logic, 112 // then that should also trigger the broadcast intent. 113 Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); 114 intent.putExtra("state", false); 115 mContext.sendBroadcastAsUser(intent, UserHandle.ALL); 116 } 117 } 118 119 /** 120 * This method is called from multiple Listeners on the Main Looper. 121 * Synchronization is not necessary. 122 */ 123 @Override 124 public void onComplete(RadioOnStateListener listener, boolean isRadioReady) { 125 mIsRadioOnCallingEnabled |= isRadioReady; 126 mInProgressListeners.remove(listener); 127 if (mCallback != null && mInProgressListeners.isEmpty()) { 128 mCallback.onComplete(null, mIsRadioOnCallingEnabled); 129 } 130 } 131 132 @Override 133 public boolean isOkToCall(Phone phone, int serviceState) { 134 return (mCallback == null) ? false : mCallback.isOkToCall(phone, serviceState); 135 } 136} 137