我是android的新手，正在使用surfaceview和线程编写一个简单的游戏，但现在当我按下主页按钮时，应用程序将崩溃，下面是崩溃日志。有人可能对此有任何想法吗？
D/dalvikvm: GC_CONCURRENT freed 2474K, 49% free 14273K/27939K, paused 20ms+41ms
06-18 22:09:51.672 1730-1730/? D/skia: Decode special JPEG file
06-18 22:09:51.692 1447-5519/? W/memalloc: /dev/pmem: No more pmem available
06-18 22:09:51.692 1447-5519/? W/memalloc: Falling back to ashmem
06-18 22:09:51.712 1447-5519/? D/memalloc: ashmem: Allocated buffer base:0x440f1000 size:1536000 fd:63
06-18 22:09:51.722 1730-1730/? D/memalloc: ashmem: Mapped buffer base:0x5743f000 size:1536000 fd:94
06-18 22:09:51.792 1447-13308/? W/memalloc: /dev/pmem: No more pmem available
06-18 22:09:51.792 1447-13308/? W/memalloc: Falling back to ashmem
06-18 22:09:51.802 1447-13308/? D/memalloc: ashmem: Allocated buffer base:0x442bf000 size:1536000 fd:71
06-18 22:09:51.802 1730-1730/? D/memalloc: ashmem: Mapped buffer base:0x575b6000 size:1536000 fd:102
06-18 22:09:51.912 27744-27744/com.example.gametestproject D/memalloc: /dev/pmem: Unmapping buffer base:0x52fbb000 size:16502784 offset:15732736
06-18 22:09:51.912 27744-27744/com.example.gametestproject D/memalloc: /dev/pmem: Unmapping buffer base:0x52708000 size:6914048 offset:6144000
06-18 22:09:51.922 1447-1447/? E/SurfaceTexture: [SurfaceView] disconnect: connected to another api (cur=0, req=2)
06-18 22:09:51.922 27744-27744/com.example.gametestproject A/libc: Fatal signal 7 (SIGBUS) at 0x00000000 (code=128)
06-18 22:09:52.002 27744-27926/com.example.gametestproject A/libc: Fatal signal 7 (SIGBUS) at 0x00000000 (code=128)
06-18 22:09:52.213 26689-26713/? D/ConnCtl: Dormancy countdown sec:10
06-18 22:09:52.333 27572-27572/? I/DEBUG: debuggerd: 2013-06-18 22:09:52
06-18 22:09:52.333 27572-27572/? I/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
06-18 22:09:52.333 27572-27572/? I/DEBUG: Build fingerprint: 'htccn_chs_cmcc/htc_primotd/primotd:4.0.3/IML74K/61230.1:user/release-keys'
06-18 22:09:52.333 27572-27572/? I/DEBUG: pid: 27744, tid: 27744 >>> com.example.gametestproject <<<
06-18 22:09:52.333 27572-27572/? I/DEBUG: signal 7 (SIGBUS), code 128 (?), fault addr 00000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: r0 ffffffff r1 bfbf8453 r2 00c85358 r3 00ccdac0
06-18 22:09:52.333 27572-27572/? I/DEBUG: r4 ffffffff r5 bfbf8453 r6 00cbaa78 r7 00cbaa78
06-18 22:09:52.333 27572-27572/? I/DEBUG: r8 bee35598 r9 00000000 10 4d384466 fp bee355d4
06-18 22:09:52.333 27572-27572/? I/DEBUG: ip 400cc160 sp bee35518 lr 400d6164 pc 400d6164 cpsr 08000010
06-18 22:09:52.333 27572-27572/? I/DEBUG: d0 3a74657366666f36 d1 2072656666756231
06-18 22:09:52.333 27572-27572/? I/DEBUG: d2 0000000400000334 d3 5197b09800000034
06-18 22:09:52.333 27572-27572/? I/DEBUG: d4 00bda3500000017f d5 ffffffff00b9cef8
06-18 22:09:52.333 27572-27572/? I/DEBUG: d6 0000000b00000001 d7 0000000000750053
06-18 22:09:52.333 27572-27572/? I/DEBUG: d8 0000000000000000 d9 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d10 0000000000000000 d11 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d12 0000000000000000 d13 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d14 0000000000000000 d15 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d16 000000c240ab8fe8 d17 3ff0000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d18 0018001700160014 d19 001a0018001a0019
06-18 22:09:52.333 27572-27572/? I/DEBUG: d20 0000000000000000 d21 3ff0000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d22 4032000000000000 d23 3ff0000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d24 0022002000220021 d25 0026002500240023
06-18 22:09:52.333 27572-27572/? I/DEBUG: d26 0000000000000000 d27 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d28 0000000000000000 d29 3ff0000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: d30 0026002600260026 d31 0000000000000000
06-18 22:09:52.333 27572-27572/? I/DEBUG: scr 80000013
06-18 22:09:52.763 27572-27572/? I/DEBUG: #00 pc 00005164 /system/lib/libcutils.so (android_atomic_add)
06-18 22:09:52.763 27572-27572/? I/DEBUG: #01 pc 0001b31c /system/lib/libutils.so (_ZNK7android7RefBase9decStrongEPKv)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #02 pc 00022e9a /system/lib/libgui.so (_ZN7android20SurfaceTextureClientD2Ev)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #03 pc 00025b78 /system/lib/libgui.so (_ZN7android7SurfaceD1Ev)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #04 pc 00025b8c /system/lib/libgui.so (_ZN7android7SurfaceD0Ev)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #05 pc 0001b338 /system/lib/libutils.so (_ZNK7android7RefBase9decStrongEPKv)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #06 pc 0005dce2 /system/lib/libandroid_runtime.so
06-18 22:09:52.773 27572-27572/? I/DEBUG: #07 pc 0005de22 /system/lib/libandroid_runtime.so
06-18 22:09:52.773 27572-27572/? I/DEBUG: #08 pc 0001eeb0 /system/lib/libdvm.so (dvmPlatformInvoke)
06-18 22:09:52.773 27572-27572/? I/DEBUG: #09 pc 0005958c /system/lib/libdvm.so (_Z16dvmCallJNIMethodPKjP6JValuePK6MethodP6Thread)
06-18 22:09:52.773 27572-27572/? I/DEBUG: code around pc:
06-18 22:09:52.783 27572-27572/? I/DEBUG: 400d6144 e1853f92 e3530000 1afffffa e8bd8070 .?....S.....p...
06-18 22:09:52.783 27572-27572/? I/DEBUG: 400d6154 e92d4070 e1a04000 e1a05001 ebffffd4 p@-..@...P......
06-18 22:09:52.783 27572-27572/? I/DEBUG: 400d6164 e1950f9f e0802004 e1853f92 e3530000 ..... ...?....S.
06-18 22:09:52.783 27572-27572/? I/DEBUG: 400d6174 1afffffa e8bd8070 e1a01000 e3e00000 ....p...........
06-18 22:09:52.783 27572-27572/? I/DEBUG: 400d6184 eafffff2 e1a01000 e3a00001 eaffffef ................
06-18 22:09:52.783 27572-27572/? I/DEBUG: stack:
06-18 22:09:52.783 27572-27572/? I/DEBUG: bee354d8 00cadae0 [heap]
06-18 22:09:52.783 27572-27572/? I/DEBUG: bee354dc 40063558
06-18 22:09:52.783 27572-27572/? I/DEBUG: bee354e0 00000080
06-18 22:09:52.783 27572-27572/? I/DEBUG: bee354e4 400634b4
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354e8 00cadae8 [heap]
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354ec 00000000
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354f0 4d384466 /system/framework/framework.odex
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354f4 40030c51 /system/lib/libc.so
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354f8 00cadae8 [heap]
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee354fc 407ea3b4 /system/lib/libgui.so
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee35500 00cbab30 [heap]
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee35504 00cbab30 [heap]
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee35508 bee35598 [stack]
06-18 22:09:52.793 27572-27572/? I/DEBUG: bee3550c 00000000
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee35510 df0027ad
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee35514 00000000
06-18 22:09:52.803 27572-27572/? I/DEBUG: #00 bee35518 bfbf8453
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee3551c 41acdac0 /dev/ashmem/dalvik-heap (deleted)
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee35520 00cbaa78 [heap]
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee35524 400b731f /system/lib/libutils.so
06-18 22:09:52.803 27572-27572/? I/DEBUG: #01 bee35528 00cbaa08 [heap]
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee3552c 407ea3b4 /system/lib/libgui.so
06-18 22:09:52.803 27572-27572/? I/DEBUG: bee35530 00cbaa78 [heap]
06-18 22:09:52.803 1616-1628/? W/CpuWake: >>releaseCpuPerfWakeLock
06-18 22:09:52.803 1616-1628/? W/CpuWake: <<releaseCpuPerfWakeLock
06-18 22:09:52.813 27572-27572/? I/DEBUG: bee35534 407d9e9d /system/lib/libgui.so
06-18 22:09:53.224 26689-26713/? D/ConnCtl: Dormancy countdown sec:9
06-18 22:09:53.844 27572-27572/? I/DEBUG: debuggerd committing suicide to free the zombie!
06-18 22:09:53.844 1616-1634/? I/BootReceiver: Copying /data/tombstones/tombstone_03 to DropBox (SYSTEM_TOMBSTONE)
06-18 22:09:53.874 28099-28099/? I/DEBUG: debuggerd: May 4 2012 00:26:47