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我正在开发一个在 android 中使用 sqlite 数据库的应用程序，最近我经常遇到崩溃，我认为这与并发数据库访问有关，尽管 db 异常没有提到它。

这是错误：

09-15 15:25:45.672     195-1476/system_process V/ActivityManager﹕ Record #1 ActivityRecord{a52ecf58 u0 com.pauloslf.efatura/.MenuInicial}: app=ProcessRecord{a5317d60 0:com.pauloslf.efatura/u0a10049}
09-15 15:25:45.672     195-1476/system_process I/ActivityManager﹕ Removing activity ActivityRecord{a52ecf58 u0 com.pauloslf.efatura/.MenuInicial} from stack at 1: haveState=false stateNotNeeded=false finishing=true state=PAUSING
        java.lang.RuntimeException: here
        at com.android.server.am.ActivityStack.removeHistoryRecordsForAppLocked(ActivityStack.java:4249)
        at com.android.server.am.ActivityManagerService.handleAppDiedLocked(ActivityManagerService.java:3015)
        at com.android.server.am.ActivityManagerService.appDiedLocked(ActivityManagerService.java:3085)
        at com.android.server.am.ActivityManagerService$AppDeathRecipient.binderDied(ActivityManagerService.java:897)
        at android.os.BinderProxy.sendDeathNotice(Binder.java:470)
        at dalvik.system.NativeStart.run(Native Method)
09-15 15:25:45.672      195-490/system_process W/InputDispatcher﹕ channel 'a5239e68 com.pauloslf.efatura/com.pauloslf.efatura.MenuInicial (server)' ~ Consumer closed input channel or an error occurred.  events=0x9
09-15 15:25:45.672      195-490/system_process E/InputDispatcher﹕ channel 'a5239e68 com.pauloslf.efatura/com.pauloslf.efatura.MenuInicial (server)' ~ Channel is unrecoverably broken and will be disposed!
09-15 15:25:45.672     195-1476/system_process V/ActivityManager﹕ No result destination from ActivityRecord{a52ecf58 u0 com.pauloslf.efatura/.MenuInicial}
09-15 15:25:45.676      119-119/? D/Zygote﹕ Process 3287 terminated by signal (11)
09-15 15:25:45.684     195-1915/system_process W/InputDispatcher﹕ Attempted to unregister already unregistered input channel 'a5239e68 com.pauloslf.efatura/com.pauloslf.efatura.MenuInicial (server)'

我正在使用单例访问 db 类：

 private static FacturasDB faturasdb = null;

    public static FacturasDB getInstance(Context context) {
        if (faturasdb == null) {
            faturasdb = new FacturasDB(context);
        }
        return faturasdb;
    }

我重现该问题的最简单方法是，当 asynctask 在主要活动上启动（后台是否访问数据库）正在运行时，我导航到另一个也使用数据库的活动。

知道为什么会发生这个问题吗？

提前非常感谢！

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