1 /* 2 * Copyright (C) 2013 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.example.android.contactslist.util; 18 19 import android.annotation.TargetApi; 20 import android.os.Build; 21 import android.os.StrictMode; 22 23 import com.example.android.contactslist.ui.ContactDetailActivity; 24 import com.example.android.contactslist.ui.ContactsListActivity; 25 26 /** 27 * This class contains static utility methods. 28 */ 29 public class Utils { 30 31 // Prevents instantiation. Utils()32 private Utils() {} 33 34 /** 35 * Enables strict mode. This should only be called when debugging the application and is useful 36 * for finding some potential bugs or best practice violations. 37 */ 38 @TargetApi(11) enableStrictMode()39 public static void enableStrictMode() { 40 // Strict mode is only available on gingerbread or later 41 if (Utils.hasGingerbread()) { 42 43 // Enable all thread strict mode policies 44 StrictMode.ThreadPolicy.Builder threadPolicyBuilder = 45 new StrictMode.ThreadPolicy.Builder() 46 .detectAll() 47 .penaltyLog(); 48 49 // Enable all VM strict mode policies 50 StrictMode.VmPolicy.Builder vmPolicyBuilder = 51 new StrictMode.VmPolicy.Builder() 52 .detectAll() 53 .penaltyLog(); 54 55 // Honeycomb introduced some additional strict mode features 56 if (Utils.hasHoneycomb()) { 57 // Flash screen when thread policy is violated 58 threadPolicyBuilder.penaltyFlashScreen(); 59 // For each activity class, set an instance limit of 1. Any more instances and 60 // there could be a memory leak. 61 vmPolicyBuilder 62 .setClassInstanceLimit(ContactsListActivity.class, 1) 63 .setClassInstanceLimit(ContactDetailActivity.class, 1); 64 } 65 66 // Use builders to enable strict mode policies 67 StrictMode.setThreadPolicy(threadPolicyBuilder.build()); 68 StrictMode.setVmPolicy(vmPolicyBuilder.build()); 69 } 70 } 71 72 /** 73 * Uses static final constants to detect if the device's platform version is Gingerbread or 74 * later. 75 */ hasGingerbread()76 public static boolean hasGingerbread() { 77 return Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD; 78 } 79 80 /** 81 * Uses static final constants to detect if the device's platform version is Honeycomb or 82 * later. 83 */ hasHoneycomb()84 public static boolean hasHoneycomb() { 85 return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB; 86 } 87 88 /** 89 * Uses static final constants to detect if the device's platform version is Honeycomb MR1 or 90 * later. 91 */ hasHoneycombMR1()92 public static boolean hasHoneycombMR1() { 93 return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1; 94 } 95 96 /** 97 * Uses static final constants to detect if the device's platform version is ICS or 98 * later. 99 */ hasICS()100 public static boolean hasICS() { 101 return Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH; 102 } 103 } 104