java.lang.OutOfMemoryError: Xamarin Android

Question

Getting java.lang.OutOfMemoryError While trying to GetPixels of mutable copy of the Bitmap.

Here is the code:

public async Task<Bitmap> LoadScaledDownBitmapForDisplayAsync(string path, BitmapFactory.Options options, int reqWidth, int reqHeight)
{
    // Calculate inSampleSize
    options.InSampleSize = CalculateInSampleSize(options, reqWidth, reqHeight);
    // Decode bitmap with inSampleSize set       
    options.InJustDecodeBounds = true;        
    Bitmap mutableBitmap = BitmapFactory.DecodeFile(path, options);
    Bitmap bitmap = mutableBitmap.Copy(Bitmap.Config.Argb8888, true);        
    allpixels = new int[bitmap.Height * bitmap.Width];
    bitmap.GetPixels(allpixels, 0, bitmap.Width, 0, 0, bitmap.Width, bitmap.Height);
    Bitmap bitmapToDisplay = null;
    for (int i = 0; i < allpixels.Length; i++)
     {
     if (allpixels[i] == Color.Black)
     {
      allpixels[i] = Color.Gray;
      int alpha = 0x00;
      allpixels[i] = Color.Red;

      bitmap.SetPixels(allpixels, 0, bitmap.Width, 0, 0, bitmap.Width, bitmap.Height);
             }
            }

    return bitmap;
}

Error:

05-25 17:24:41.945 D/dalvikvm(12002): GC_FOR_ALLOC freed 701K, 2% free 259110K/261936K, paused 53ms, total 54ms
05-25 17:24:42.850 I/dalvikvm-heap(12002): Clamp target GC heap from 256.376MB to 256.000MB
05-25 17:24:42.850 D/dalvikvm(12002): GC_FOR_ALLOC freed 276K, 1% free 259383K/261936K, paused 59ms, total 59ms
05-25 17:24:42.890 I/dalvikvm-heap(12002): Clamp target GC heap from 256.643MB to 256.000MB
05-25 17:24:42.890 D/dalvikvm(12002): GC_FOR_ALLOC freed <1K, 1% free 259655K/261936K, paused 37ms, total 37ms
05-25 17:24:42.890 I/dalvikvm-heap(12002): Forcing collection of SoftReferences for 281824-byte allocation
05-25 17:24:42.930 I/dalvikvm-heap(12002): Clamp target GC heap from 258.635MB to 256.000MB
05-25 17:24:42.930 D/dalvikvm(12002): GC_BEFORE_OOM freed 10K, 1% free 259645K/261936K, paused 42ms, total 42ms
05-25 17:24:42.930 E/dalvikvm-heap(12002): Out of memory on a 281824-byte allocation.
05-25 17:24:42.930 I/dalvikvm(12002): "main" prio=5 tid=1 RUNNABLE
05-25 17:24:42.930 I/dalvikvm(12002):   | group="main" sCount=0 dsCount=0 obj=0x41caa578 self=0x41c88a60
05-25 17:24:42.930 I/dalvikvm(12002):   | sysTid=12002 nice=-16 sched=0/0 cgrp=apps handle=1074249724
05-25 17:24:42.930 I/dalvikvm(12002):   | state=R schedstat=( 763705373545 16690026208 56421 ) utm=75810 stm=560 core=3
05-25 17:24:42.930 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.n_onClick(Native Method)
05-25 17:24:42.930 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.onClick(View_OnClickListenerImplementor.java:29)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.view.View.performClick(View.java:4475)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.view.View$PerformClick.run(View.java:18786)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.os.Handler.handleCallback(Handler.java:730)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.os.Handler.dispatchMessage(Handler.java:92)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.os.Looper.loop(Looper.java:176)
05-25 17:24:42.930 I/dalvikvm(12002):   at android.app.ActivityThread.main(ActivityThread.java:5419)
05-25 17:24:42.930 I/dalvikvm(12002):   at java.lang.reflect.Method.invokeNative(Native Method)
05-25 17:24:42.930 I/dalvikvm(12002):   at java.lang.reflect.Method.invoke(Method.java:525)
05-25 17:24:42.930 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-25 17:24:42.930 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-25 17:24:42.935 I/dalvikvm(12002):   at dalvik.system.NativeStart.main(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002): 
05-25 17:24:42.935 W/dalvikvm(12002): JNI WARNING: JNI method called with exception pending
05-25 17:24:42.935 W/dalvikvm(12002):              in Lmono/android/view/View_OnClickListenerImplementor;.n_onClick:(Landroid/view/View;)V (SetIntArrayRegion)
05-25 17:24:42.935 W/dalvikvm(12002): Pending exception is:
05-25 17:24:42.935 I/dalvikvm(12002): java.lang.OutOfMemoryError:
05-25 17:24:42.935 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.n_onClick(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.onClick(View_OnClickListenerImplementor.java:29)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.view.View.performClick(View.java:4475)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.view.View$PerformClick.run(View.java:18786)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Handler.handleCallback(Handler.java:730)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Handler.dispatchMessage(Handler.java:92)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Looper.loop(Looper.java:176)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.app.ActivityThread.main(ActivityThread.java:5419)
05-25 17:24:42.935 I/dalvikvm(12002):   at java.lang.reflect.Method.invokeNative(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002):   at java.lang.reflect.Method.invoke(Method.java:525)
05-25 17:24:42.935 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-25 17:24:42.935 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
05-25 17:24:42.935 I/dalvikvm(12002):   at dalvik.system.NativeStart.main(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002): "main" prio=5 tid=1 NATIVE
05-25 17:24:42.935 I/dalvikvm(12002):   | group="main" sCount=0 dsCount=0 obj=0x41caa578 self=0x41c88a60
05-25 17:24:42.935 I/dalvikvm(12002):   | sysTid=12002 nice=-16 sched=0/0 cgrp=apps handle=1074249724
05-25 17:24:42.935 I/dalvikvm(12002):   | state=R schedstat=( 763706606629 16692302499 56458 ) utm=75810 stm=560 core=3
05-25 17:24:42.935 I/dalvikvm(12002):   #00  pc 000012fe  /system/lib/libcorkscrew.so (unwind_backtrace_thread+29)
05-25 17:24:42.935 I/dalvikvm(12002):   #01  pc 00060b82  /system/lib/libdvm.so (dvmDumpNativeStack(DebugOutputTarget const*, int)+33)
05-25 17:24:42.935 I/dalvikvm(12002):   #02  pc 00054c20  /system/lib/libdvm.so (dvmDumpThreadEx(DebugOutputTarget const*, Thread*, bool)+395)
05-25 17:24:42.935 I/dalvikvm(12002):   #03  pc 00054c8e  /system/lib/libdvm.so (dvmDumpThread(Thread*, bool)+25)
05-25 17:24:42.935 I/dalvikvm(12002):   #04  pc 00038f00  /system/lib/libdvm.so
05-25 17:24:42.935 I/dalvikvm(12002):   #05  pc 0003af50  /system/lib/libdvm.so
05-25 17:24:42.935 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.n_onClick(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002):   at mono.android.view.View_OnClickListenerImplementor.onClick(View_OnClickListenerImplementor.java:29)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.view.View.performClick(View.java:4475)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.view.View$PerformClick.run(View.java:18786)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Handler.handleCallback(Handler.java:730)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Handler.dispatchMessage(Handler.java:92)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.os.Looper.loop(Looper.java:176)
05-25 17:24:42.935 I/dalvikvm(12002):   at android.app.ActivityThread.main(ActivityThread.java:5419)
05-25 17:24:42.935 I/dalvikvm(12002):   at java.lang.reflect.Method.invokeNative(Native Method)
05-25 17:24:42.935 I/dalvikvm(12002):   at java.lang.reflect.Method.invoke(Method.java:525)
05-25 17:24:42.935 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
05-25 17:24:42.935 I/dalvikvm(12002):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
In mgmain JNI_OnLoad
05-25 17:24:42.940 I/dalvikvm(12002):   at dalvik.system.NativeStart.main(Native Method)
05-25 17:24:42.940 I/dalvikvm(12002): 
05-25 17:24:42.940 E/dalvikvm(12002): VM aborting
05-25 17:24:42.945 E/mono-rt (12002): Stacktrace:
05-25 17:24:42.945 E/mono-rt (12002):

And Finally Getting this Message:

Got a SIGSEGV while executing native code. This usually indicates
05-25 17:24:42.985 E/mono-rt (12002): a fatal error in the mono runtime or one of the native libraries 
05-25 17:24:42.985 E/mono-rt (12002): used by your application.

Any Idea or help would be really helpful.

How large is your image? You can't decode huge images without getting a OutOfMemoryException. Or your memory is full already. — Sven-Michael Stübe
– Sven-Michael Stübe, Commented May 23, 2016 at 12:44
@Sven-MichaelStübe i can able to display the image in ImageView without error ,But while trying to get the mutable copy of the Bitmap,I am facing this Error. — Janmejoy
– Janmejoy, Commented May 23, 2016 at 12:47
Does CalculateInSampleSize inflate the full bitmap to get measurements? Perhaps inside there you need to set injustdecodebounds = true. I cant see that code but would venture to guess you might be inflating the bitmap to get sizing then inflating a new one as mutable? — ClintL
– ClintL, Commented May 23, 2016 at 16:18
Have you had a look at the memory heap? You can do so by using Android Studio. I have personally been facing the same problem previously, and the memory dump indicated, that all instances of bItmaps ever created were kept in the memory. This is because, that they are not automatically garbage collected. If that's the case, then you could consider disposing the bitmaps yourself. — Demitrian
– Demitrian, Commented May 23, 2016 at 17:20
@Demitrian the same code is working perfectly in Android Studio without Errors. — Janmejoy
– Janmejoy, Commented May 24, 2016 at 6:15

Jon Douglas · Accepted Answer · 2016-06-01 20:54:18Z

I would highly recommend using using statements all around your bitmap code. That should help dispose of the proper peer wrapper. If you don't use using statements, then ensure you are calling .Dipose() or setting the peer wrapper to null to sever the connection.

Secondly, I would also recommend a manual GC invoke via GC.Collect() or JavaSystem.GC() to help reduce the working set at the end of your operation.

i.e.:

using (var bitmap = HowIGetThisBitMap())
{
    //How I use this bitmap while in scope
}

GC.Collect(); //I then ensure I manually invoke the GC

Yes this is somewhat against traditional .NET items, but we are on a mobile device where we have memory sensitive operations. This is especially the case for lower-end devices that don't have a large RAM cache. This is specifically one spot of code that we would want to call GC.Collect().

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