Getting anr because thread resulting in main thread starvation.

"pool-1-thread-1" tid=16 Native Performing disk I/O
"pool-1-thread-1" prio=5 tid=16 Native
| group="main" sCount=1 dsCount=0 obj=0x12c07440 self=0xab8b2778
| sysTid=24967 nice=0 cgrp=apps sched=0/0 handle=0xab8b2db8
| state=D schedstat=( 0 0 0 ) utm=50 stm=24 core=0 HZ=100
| stack=0xf015f000-0xf0161000 stackSize=1036KB
| held mutexes=
#00 pc 0000000000039420 /system/lib/libc.so (fsync+12)
#01 pc 000000000001e253 /system/lib/libjavacore.so (???)
#02 pc 000000000007166f /system/framework/arm/boot.oat (Java_libcore_io_Posix_fsync__Ljava_io_FileDescriptor_2+102)
at libcore.io.Posix.fsync (Native method)
at libcore.io.BlockGuardOs.fsync (BlockGuardOs.java:143)
at java.io.FileDescriptor.sync (FileDescriptor.java:74)
at android.os.FileUtils.sync (FileUtils.java:152)
at android.app.SharedPreferencesImpl.writeToFile (SharedPreferencesImpl.java:598)
at android.app.SharedPreferencesImpl.access$800 (SharedPreferencesImpl.java:51)
at android.app.SharedPreferencesImpl$2.run (SharedPreferencesImpl.java:512)
- locked <@addr=0x130d7710> (a java.lang.Object)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:587)
at java.lang.Thread.run (Thread.java:818)

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