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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package org.chromium.base; | 5 package org.chromium.base; |
6 | 6 |
7 import java.io.BufferedReader; | 7 import java.io.BufferedReader; |
8 import java.io.FileReader; | 8 import java.io.FileReader; |
9 import java.util.regex.Matcher; | 9 import java.util.regex.Matcher; |
10 import java.util.regex.Pattern; | 10 import java.util.regex.Pattern; |
11 | 11 |
12 import android.app.ActivityManager; | 12 import android.app.ActivityManager; |
13 import android.app.ActivityManager.MemoryInfo; | 13 import android.app.ActivityManager.MemoryInfo; |
14 import android.content.Context; | 14 import android.content.Context; |
15 import android.os.Build; | 15 import android.os.Build; |
16 import android.util.Log; | 16 import android.util.Log; |
17 | 17 |
| 18 import org.chromium.base.BaseSwitches; |
| 19 import org.chromium.base.CommandLine; |
| 20 |
18 /** | 21 /** |
19 * Exposes system related information about the current device. | 22 * Exposes system related information about the current device. |
20 */ | 23 */ |
21 public class SysUtils { | 24 public class SysUtils { |
22 // Any device that runs this or an older version of the system cannot be con
sidered 'low-end' | 25 // Any device that runs this or an older version of the system cannot be con
sidered 'low-end' |
23 private static final int ANDROID_LOW_MEMORY_ANDROID_SDK_THRESHOLD = | 26 private static final int ANDROID_LOW_MEMORY_ANDROID_SDK_THRESHOLD = |
24 Build.VERSION_CODES.JELLY_BEAN_MR2; | 27 Build.VERSION_CODES.JELLY_BEAN_MR2; |
25 | 28 |
26 // A device reporting strictly more total memory in megabytes cannot be cons
idered 'low-end'. | 29 // A device reporting strictly more total memory in megabytes cannot be cons
idered 'low-end'. |
27 private static final long ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB = 512; | 30 private static final long ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB = 512; |
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91 } | 94 } |
92 | 95 |
93 return 0; | 96 return 0; |
94 } | 97 } |
95 | 98 |
96 /** | 99 /** |
97 * @return Whether or not this device should be considered a low end device. | 100 * @return Whether or not this device should be considered a low end device. |
98 */ | 101 */ |
99 @CalledByNative | 102 @CalledByNative |
100 public static boolean isLowEndDevice() { | 103 public static boolean isLowEndDevice() { |
101 if (Build.VERSION.SDK_INT <= ANDROID_LOW_MEMORY_ANDROID_SDK_THRESHOLD) { | |
102 return false; | |
103 } | |
104 if (sLowEndDevice == null) { | 104 if (sLowEndDevice == null) { |
105 int ramSizeKB = amountOfPhysicalMemoryKB(); | 105 sLowEndDevice = detectLowEndDevice(); |
106 sLowEndDevice = (ramSizeKB > 0 && | |
107 ramSizeKB / 1024 < ANDROID_LOW_MEMORY_DEVICE_THRESHOLD_MB); | |
108 } | 106 } |
109 | 107 |
110 return sLowEndDevice.booleanValue(); | 108 return sLowEndDevice.booleanValue(); |
111 } | 109 } |
| 110 |
| 111 private static boolean detectLowEndDevice() { |
| 112 if (CommandLine.isInitialized()) { |
| 113 if (CommandLine.getInstance().hasSwitch(BaseSwitches.ENABLE_LOW_END_
DEVICE_MODE)) { |
| 114 return true; |
| 115 } |
| 116 if (CommandLine.getInstance().hasSwitch(BaseSwitches.DISABLE_LOW_END
_DEVICE_MODE)) { |
| 117 return false; |
| 118 } |
| 119 } |
| 120 |
| 121 if (Build.VERSION.SDK_INT <= ANDROID_LOW_MEMORY_ANDROID_SDK_THRESHOLD) { |
| 122 return false; |
| 123 } |
| 124 |
| 125 int ramSizeKB = amountOfPhysicalMemoryKB(); |
| 126 return (ramSizeKB > 0 && ramSizeKB / 1024 < ANDROID_LOW_MEMORY_DEVICE_TH
RESHOLD_MB); |
| 127 } |
112 } | 128 } |
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