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 17 package com.android.server.telecom; 18 19 import android.content.ContentResolver; 20 import android.provider.Settings; 21 22 /** 23 * A helper class which serves only to make it easier to lookup timeout values. This class should 24 * never be instantiated, and only accessed through the {@link #get(String, long)} method. 25 * 26 * These methods are safe to call from any thread, including the UI thread. 27 */ 28 public final class Timeouts { 29 /** A prefix to use for all keys so to not clobber the global namespace. */ 30 private static final String PREFIX = "telecom."; 31 32 private Timeouts() {} 33 34 /** 35 * Returns the timeout value from Settings or the default value if it hasn't been changed. This 36 * method is safe to call from any thread, including the UI thread. 37 * 38 * @param contentResolver The content resolved. 39 * @param key Settings key to retrieve. 40 * @param defaultValue Default value, in milliseconds. 41 * @return The timeout value from Settings or the default value if it hasn't been changed. 42 */ 43 private static long get(ContentResolver contentResolver, String key, long defaultValue) { 44 return Settings.Secure.getLong(contentResolver, PREFIX + key, defaultValue); 45 } 46 47 /** 48 * Returns the longest period, in milliseconds, to wait for the query for direct-to-voicemail 49 * to complete. If the query goes beyond this timeout, the incoming call screen is shown to the 50 * user. 51 */ 52 public static long getDirectToVoicemailMillis(ContentResolver contentResolver) { 53 return get(contentResolver, "direct_to_voicemail_ms", 500L); 54 } 55 56 /** 57 * Returns the amount of time to wait before disconnecting a call that was canceled via 58 * NEW_OUTGOING_CALL broadcast. This timeout allows apps which repost the call using a gateway 59 * to reuse the existing call, preventing the call from causing a start->end->start jank in the 60 * in-call UI. 61 */ 62 public static long getNewOutgoingCallCancelMillis(ContentResolver contentResolver) { 63 return get(contentResolver, "new_outgoing_call_cancel_ms", 300L); 64 } 65 66 /** 67 * Returns the amount of time to play each DTMF tone after post dial continue. 68 * This timeout allows the current tone to play for a certain amount of time before either being 69 * interrupted by the next tone or terminated. 70 */ 71 public static long getDelayBetweenDtmfTonesMillis(ContentResolver contentResolver) { 72 return get(contentResolver, "delay_between_dtmf_tones_ms", 300L); 73 } 74 75 /** 76 * Returns the amount of time to wait for an emergency call to be placed before routing to 77 * a different call service. A value of 0 or less means no timeout should be used. 78 */ 79 public static long getEmergencyCallTimeoutMillis(ContentResolver contentResolver) { 80 return get(contentResolver, "emergency_call_timeout_millis", 25000L /* 25 seconds */); 81 } 82 83 /** 84 * Returns the amount of time to wait for an emergency call to be placed before routing to 85 * a different call service. This timeout is used only when the radio is powered off (for 86 * example in airplane mode). A value of 0 or less means no timeout should be used. 87 */ 88 public static long getEmergencyCallTimeoutRadioOffMillis(ContentResolver contentResolver) { 89 return get(contentResolver, "emergency_call_timeout_radio_off_millis", 90 60000L /* 1 minute */); 91 } 92 } 93
