CODEWITHSUNDEEP
javaandroideclipse
Lahcen
Lahcen

Reputation: 1423

android add java.lang.management API

Now I have a problem with Android non-supported libraries. In fact it does not support this API: "java.lang.management". Eclipse shows me this error :

10-25 17:53:03.460: java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory.

I wonder how I can add this API to be supported by my android application.

Any help please.

Upvotes: 3

Views: 5477

Answers (2)

user9307810
user9307810

Reputation:

It seems that with Android Version 23, situation has slightly improved. For example I found a replacement for:

GarbageCollectorMXBean gb = ....
long gctime = gb.getCollectionTime();

Thanks to @Jacob, I am now using this code. First the getRuntimeStat() method is not available in all android versions. So I am doing some reflection first:

static {
  try {
      Class<?> debugClass = Debug.class;
      getRuntimeStat = debugClass.getDeclaredMethod(
           "getRuntimeStat", String.class);
  } catch (NoSuchMethodException x) {
      getRuntimeStat = null;
  }
}

Retrieving the GC time is then a matter of calling the method handle, with the correct property name. I am currently using this property name:

String gctimestr;
try {
    gctimestr = (String) (getRuntimeStat != null ? 
         getRuntimeStat.invoke(null, "art.gc.gc-time") : null);
} catch (IllegalAccessException e) {
    gctimestr = null;
} catch (InvocationTargetException e) {
    gctimestr = null;
}

The gctimestr can then be converted to a long value, if its non-null. On the other hand if its null the statistics is not available, through this API.

Upvotes: 2

Bryan Herbst
Bryan Herbst

Reputation: 67249

That API is not a part of Android, and is not compatible with Android.

The java.lang.management API is for managing and monitoring the Java VM. Android's Dalvik VM is not a Java VM.

Upvotes: 8

Related Questions