How to get current memory usage in android

Question

I have used  proc meminfo and parsed command response however it result shows that     MemTotal         94348 kB MemFree           5784 kB  means  it shows there is only 5MB free memory  Is it possible with android mobile  There is only 5-6 application installed on my mobile and no other task is running  but still this command shows there is very little free memory   Can somebody clarify this  or is there any other way of getting memory usage in android

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final long usedMemInMB  runtime totalMemory   - runtime freeMemory      1048576L  final long maxHeapSizeInMB runtime maxMemory     1048576L  final long availHeapSizeInMB   maxHeapSizeInMB - usedMemInMB    It is a strange code  It return MaxMemory -  totalMemory - freeMemory   If freeMemory equals 0  then the code will return MaxMemory - totalMemory  so it can more or equals 0  Why freeMemory not used

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It depends on your definition of what memory query you wish to get     Usually  you d like to know the status of the heap memory  since if it uses too much memory  you get OOM and crash the app   For this  you can check the next values   final Runtime runtime   Runtime getRuntime    final long usedMemInMB  runtime totalMemory   - runtime freeMemory      1048576L  final long maxHeapSizeInMB runtime maxMemory     1048576L  final long availHeapSizeInMB   maxHeapSizeInMB - usedMemInMB    The more the  usedMemInMB  variable gets close to  maxHeapSizeInMB   the closer availHeapSizeInMB gets to zero  the closer you get OOM   Due to memory fragmentation  you may get OOM BEFORE this reaches zero    That s also what the DDMS tool of memory usage shows     Alternatively  there is the real RAM usage  which is how much the entire system uses - see accepted answer to calculate that     Update  since Android O makes your app also use the native RAM  at least for Bitmaps storage  which is usually the main reason for huge memory usage   and not just the heap  things have changed  and you get less OOM  because the heap doesn t contain bitmaps anymore check here   but you should still keep an eye on memory use if you suspect you have memory leaks  On Android O  if you have memory leaks that should have caused OOM on older versions  it seems it will just crash without you being able to catch it  Here s how to check for memory usage   val nativeHeapSize   Debug getNativeHeapSize   val nativeHeapFreeSize   Debug getNativeHeapFreeSize   val usedMemInBytes   nativeHeapSize - nativeHeapFreeSize val usedMemInPercentage   usedMemInBytes   100   nativeHeapSize   But I believe it might be best to use the profiler of the IDE  which shows the data in real time  using a graph    So the good news on Android O is that it s much harder to get crashes due to OOM of storing too many large bitmaps  but the bad news is that I don t think it s possible to catch such a case during runtime      EDIT  seems Debug getNativeHeapSize   changes over time  as it shows you the total max memory for your app  So those functions are used only for the profiler  to show how much your app is using    If you want to get the real total and available native RAM   use this   val memoryInfo   ActivityManager MemoryInfo    getSystemService Context ACTIVITY SERVICE  as ActivityManager  getMemoryInfo memoryInfo  val nativeHeapSize   memoryInfo totalMem val nativeHeapFreeSize   memoryInfo availMem val usedMemInBytes   nativeHeapSize - nativeHeapFreeSize val usedMemInPercentage   usedMemInBytes   100   nativeHeapSize Log d  AppLog    total   Formatter formatFileSize this  nativeHeapSize                free   Formatter formatFileSize this  nativeHeapFreeSize                used   Formatter formatFileSize this  usedMemInBytes     usedMemInPercentage

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public static boolean isAppInLowMemory Context context        ActivityManager activityManager    ActivityManager  context getSystemService Context ACTIVITY SERVICE       ActivityManager MemoryInfo memoryInfo   new ActivityManager MemoryInfo        activityManager getMemoryInfo memoryInfo        return memoryInfo lowMemory

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Linux s memory management philosophy is  Free memory is wasted memory    I assume that the next two lines will show how much memory is in  Buffers  and how much is  Cached   While there is a difference between the two  please don t ask what that difference is    they both roughly add up to the amount of memory used to cache file data and metadata   A far more useful guide to free memory on a Linux system is the free 1  command  on my desktop  it reports information like this      free -m              total       used       free     shared    buffers     cached Mem           5980       1055       4924          0         91        374 -   buffers cache         589       5391 Swap          6347          0       6347   The   - buffers cache  line is the magic line  it reports that I ve really got around 589 megs of actively required process memory  and around 5391 megs of  free  memory  in the sense that the 91 374 megabytes of buffers cached memory can be thrown away if the memory could be more profitably used elsewhere    My machine has been up for about three hours  doing nearly nothing but stackoverflow  which is why I have so much free memory    If Android doesn t ship with free 1   you can do the math yourself with the  proc meminfo file  I just like the free 1  output format

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I refer few writings   reference    http   www hanbit co kr network view html bi id 1313 How to get total RAM size of a device    This getMemorySize   method is returned MemorySize that has total and free memory size  I don t believe this code perfectly  This code is testing on LG G3 cat 6  v5 0 1       private MemorySize getMemorySize             final Pattern PATTERN   Pattern compile    a-zA-Z      s    d               MemorySize result   new MemorySize            String line          try               RandomAccessFile reader   new RandomAccessFile   proc meminfo    r                while   line   reader readLine       null                    Matcher m   PATTERN matcher line                   if  m find                          String name   m group 1                       String size   m group 2                        if  name equalsIgnoreCase  MemTotal                              result total   Long parseLong size                         else if  name equalsIgnoreCase  MemFree      name equalsIgnoreCase  Buffers                                  name equalsIgnoreCase  Cached      name equalsIgnoreCase  SwapFree                              result free    Long parseLong size                                                                     reader close                 result total    1024              result free    1024            catch  IOException e                e printStackTrace                       return result             private static class MemorySize           public long total   0          public long free   0          I know that Pattern compile   is expensive cost so You may move its code to class member

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Here is a way to calculate memory usage of currently running application   public static long getUsedMemorySize          long freeSize   0L      long totalSize   0L      long usedSize   -1L      try           Runtime info   Runtime getRuntime            freeSize   info freeMemory            totalSize   info totalMemory            usedSize   totalSize - freeSize        catch  Exception e            e printStackTrace              return usedSize

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I looked at Android Source Tree   Inside com android server am ActivityManagerService java  internal service exposed by android app ActivityManager    public void getMemoryInfo ActivityManager MemoryInfo outInfo        final long homeAppMem   mProcessList getMemLevel ProcessList HOME APP ADJ       final long hiddenAppMem   mProcessList getMemLevel ProcessList HIDDEN APP MIN ADJ       outInfo availMem   Process getFreeMemory        outInfo totalMem   Process getTotalMemory        outInfo threshold   homeAppMem      outInfo lowMemory   outInfo availMem  lt   homeAppMem     hiddenAppMem-homeAppMem  2        outInfo hiddenAppThreshold   hiddenAppMem      outInfo secondaryServerThreshold   mProcessList getMemLevel              ProcessList SERVICE ADJ       outInfo visibleAppThreshold   mProcessList getMemLevel              ProcessList VISIBLE APP ADJ       outInfo foregroundAppThreshold   mProcessList getMemLevel              ProcessList FOREGROUND APP ADJ       Inside android os Process java       hide    public static final native long getFreeMemory          hide    public static final native long getTotalMemory      It calls JNI method from android util Process cpp  Conclusion  MemoryInfo availMem   MemFree   Cached in  proc meminfo   Notes  Total Memory is added in API level 16

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Another way  currently showing 25MB free on my G1    MemoryInfo mi   new MemoryInfo    ActivityManager activityManager    ActivityManager  getSystemService ACTIVITY SERVICE   activityManager getMemoryInfo mi   long availableMegs   mi availMem   1048576L

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you can also use DDMS tool which is part of android SDK it self  it helps in getting memory allocations of java code and native c c   code as well

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Here is another way to view your app s memory usage   adb shell dumpsys meminfo  lt com package name gt  -d   Sample output   Applications Memory Usage  kB   Uptime  2896577 Realtime  2896577     MEMINFO in pid 2094  com package name                        Pss  Private  Private  Swapped     Heap     Heap     Heap                  Total    Dirty    Clean    Dirty     Size    Alloc     Free                 ------   ------   ------   ------   ------   ------   ------   Native Heap     3472     3444        0        0     5348     4605      102   Dalvik Heap     2349     2188        0        0     4640     4486      154  Dalvik Other     1560     1392        0        0         Stack      772      772        0        0     Other dev        4        0        4        0       so mmap     2749     1040     1220        0      jar mmap        1        0        0        0      apk mmap      218        0       32        0      ttf mmap       38        0        4        0      dex mmap     3161       80     2564        0    Other mmap        9        4        0        0       Unknown       76       76        0        0         TOTAL    14409     8996     3824        0     9988     9091      256   Objects                Views        30         ViewRootImpl         2          AppContexts         4           Activities         2               Assets         2        AssetManagers         2        Local Binders        17        Proxy Binders        21     Death Recipients         7      OpenSSL Sockets         0   SQL          MEMORY USED         0   PAGECACHE OVERFLOW         0          MALLOC SIZE         0    For overall memory usage   adb shell dumpsys meminfo   https   developer android com studio command-line dumpsys meminfo

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CAUTION  This answer measures memory usage available of the DEVICE  This is NOT what is available to your app  To measure what your APP is doing  and is PERMITTED to do  Use android developer s answer     Android docs - ActivityManager MemoryInfo   parse  proc meminfo command  You can find reference code here  Get Memory Usage in Android use below code and get current RAM   MemoryInfo mi   new MemoryInfo    ActivityManager activityManager    ActivityManager  getSystemService ACTIVITY SERVICE   activityManager getMemoryInfo mi   double availableMegs   mi availMem   0x100000L     Percentage can be calculated for API 16  double percentAvail   mi availMem    double mi totalMem   100 0     Explanation of the number 0x100000L    1024 bytes         1 Kibibyte  1024 Kibibyte      1 Mebibyte  1024   1024        1048576 1048576            0x100000   It s quite obvious that the number is used to convert from bytes to mebibyte  P S  we need to calculate total memory only once  so call point 1 only once in your code and then after  you can call code of point 2 repetitively

[android] How to get current memory usage in android?

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