Android 应用程序在某些手机上使用的 RAM 多于最大堆大小
我有一个应用程序可以在大多数手机（例如 Nexus **）上运行正常：内存使用量永远不会超过 24MB。 但在我的索尼爱立信Xperia Arc上，运行几天后，它使用了70MB以上的RAM（根据设置->应用程序->运行服务）。
Runtime.getRuntime().maxMemory() 表示我的手机的最大堆大小仅为 32MB。
有什么方法可以了解我的手机上的应用程序的情况吗？
这是此应用程序的 adb meminfo：
C:\>adb -d shell dumpsys meminfo 4606
Applications Memory Usage (kB):
Uptime: 409334045 Realtime: 585217200
** MEMINFO in pid 4606 [com.*****************] **
native dalvik other total
size: 60796 10695 N/A 71491
allocated: 54057 6091 N/A 60148
free: 6706 4604 N/A 11310
(Pss): 56549 1129 8385 66063
(shared dirty): 2128 1304 4964 8396
(priv dirty): 56496 892 8156 65544
Objects
Views: 0 ViewRoots: 0
AppContexts: 0 Activities: 0
Assets: 3 AssetManagers: 3
Local Binders: 5 Proxy Binders: 14
Death Recipients: 222
OpenSSL Sockets: 2
SQL
heap: 425 MEMORY_USED: 425
PAGECACHE_OVERFLOW: 81 MALLOC_SIZE: 50
DATABASES
pgsz dbsz Lookaside(b) Dbname
1 54 223 *.db
1 27 198 **.db
1 5 24 ***.db
1 11 56 ****.db
C:\>
I have an app that runs OK on most phones(such as Nexus **): the memory usage never goes above 24MB.
But on my Sony Ericsson Xperia Arc, after running for a few days, it uses more than 70MB RAM (according to Settings->Application->Running services).
Runtime.getRuntime().maxMemory() says my phone has a max heap size of only 32MB.
Is there any way to find out what's going on with my app on this phone?
Here's the adb meminfo for this app:
C:\>adb -d shell dumpsys meminfo 4606
Applications Memory Usage (kB):
Uptime: 409334045 Realtime: 585217200
** MEMINFO in pid 4606 [com.*****************] **
native dalvik other total
size: 60796 10695 N/A 71491
allocated: 54057 6091 N/A 60148
free: 6706 4604 N/A 11310
(Pss): 56549 1129 8385 66063
(shared dirty): 2128 1304 4964 8396
(priv dirty): 56496 892 8156 65544
Objects
Views: 0 ViewRoots: 0
AppContexts: 0 Activities: 0
Assets: 3 AssetManagers: 3
Local Binders: 5 Proxy Binders: 14
Death Recipients: 222
OpenSSL Sockets: 2
SQL
heap: 425 MEMORY_USED: 425
PAGECACHE_OVERFLOW: 81 MALLOC_SIZE: 50
DATABASES
pgsz dbsz Lookaside(b) Dbname
1 54 223 *.db
1 27 198 **.db
1 5 24 ***.db
1 11 56 ****.db
C:\>
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本机代码的内存使用不受 Java 堆大小的限制，因此应用程序很容易超出该限制。虽然这确实意味着 Android 更有可能在后台杀死您的应用程序，但只要您不超过设备上的可用 RAM，这就不成问题。
如果您在一部手机上看到不同的内存使用情况，但在另一部手机上却没有（并且两个应用程序都以相同的方式进行交互），那么我猜测制造商在该特定手机上定制的 Android 版本存在内存泄漏。正在触发。如果是这种情况，那么您无能为力。不过，检查一下您自己的代码以确保内存泄漏不是您的错也没什么坏处。
话虽如此，在现代设备上 70MB 并不需要担心。您在大多数手机上应该是安全的，因为您的大小低于 150MB。
The memory usage of native code is not restricted by the Java heap size, so applications can easily exceed that limit. While this does mean Android is more likely to kill your application when it is in the background, it shouldn't be a problem as long as you don't exceed the available RAM on the device.
If you are seeing different memory use over time on one phone but not the other (and both apps are being interacted with in the same manner) then I would guess that the manufacturer's custom build of Android on that particular phone has a memory leak that you are triggering. If that is the case, then there isn't much you can do about it. It wouldn't hurt to look through your own code just to make sure the memory leak isn't your fault, however.
That being said, 70MB isn't anything to worry about on modern devices. You should be safe on most phones as as you stick under ~150MB.