本地txt打开会出现OutOfMemoryError

[eric0815]

操作步骤,清理后台,打开IReader,载入一个本地txt文件,从书架打开,返回书架,再点击任意一个txt都会黑屏
后台报错信息:

01-06 22:47:20.552 2040-2059/com.example.newbiechen.ireader I/art: WaitForGcToComplete blocked for 5.419s for cause Background
01-06 22:47:20.552 2040-2040/com.example.newbiechen.ireader I/art: Waiting for a blocking GC Alloc
01-06 22:47:20.552 2040-2132/com.example.newbiechen.ireader I/art: Waiting for a blocking GC Alloc
01-06 22:47:20.577 2040-2040/com.example.newbiechen.ireader I/art: WaitForGcToComplete blocked for 875.902ms for cause Alloc
01-06 22:47:20.577 2040-2040/com.example.newbiechen.ireader I/art: Starting a blocking GC Alloc
01-06 22:47:20.578 2040-2132/com.example.newbiechen.ireader I/art: WaitForGcToComplete blocked for 328.382ms for cause Alloc
01-06 22:47:20.578 2040-2132/com.example.newbiechen.ireader I/art: Starting a blocking GC Alloc
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:111)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at android.os.Handler.handleCallback(Handler.java:751)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at android.os.Looper.loop(Looper.java:159)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6363)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at java.lang.reflect.Method.invoke(Native Method)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1096)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:883)
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader W/System.err: Caused by: java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack trace available
01-06 22:47:20.578 2040-2040/com.example.newbiechen.ireader E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.newbiechen.ireader, PID: 2040
java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:111)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:6363)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1096)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:883)
Caused by: java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack trace available
01-06 22:47:20.590 2040-2040/com.example.newbiechen.ireader I/Process: killProcess pid=2040
java.lang.RuntimeException
at android.os.Process.killProcess(Process.java:1258)
at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:111)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1068)
at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1063)
at io.reactivex.plugins.RxJavaPlugins.uncaught(RxJavaPlugins.java:288)
at io.reactivex.plugins.RxJavaPlugins.onError(RxJavaPlugins.java:282)
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:113)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:159)
at android.app.ActivityThread.main(ActivityThread.java:6363)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1096)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:883)
01-06 22:47:20.590 2040-2040/com.example.newbiechen.ireader I/Process: Sending signal. PID: 2040 SIG: 9

[newbiechen1024]

阅读界面 OOM 崩溃的原因是这样的：

1. 我是通过使用 PageView@onSizeChanged() 来获取当前屏幕的大小的。
2. 在解析文本，加载章节的代码中，具体在 PageLoader@loadPages() 中，会根据 mVisibleHeght 即当前屏幕的高度，进行加载章节。
3. 某些情况下 loadPages() 会在 onSizeChanged() 完成之前执行，导致获取到的 height 一直为 0 ，导致 loadPagess() 中 while 循环一直进行不会退出。

结论就是 onSizeChanged() 是异步执行，转换成同步回调的。