Initializing TelescopeLayout causes StrictMode violations

Getting the external cache directory causes strict mode errors for disk access on mainthread. It looks like it might be possible to defer that call until after the constructor, possibly until the SaveScreenshotTask. I can try and submit a PR fixing this up.
07-05 13:31:41.118 8906-8906/com.app.package D/StrictMode: StrictMode policy violation; ~duration=58 ms: android.os.StrictMode$StrictModeDiskReadViolation: policy=4784159 violation=2
                                                                                at android.os.StrictMode$AndroidBlockGuardPolicy.onReadFromDisk(StrictMode.java:1263)
                                                                                at libcore.io.BlockGuardOs.statvfs(BlockGuardOs.java:297)
                                                                                at java.io.File.getTotalSpace(File.java:1126)
                                                                                at android.os.storage.StorageManager.getStorageLowBytes(StorageManager.java:943)
                                                                                at android.os.storage.VolumeInfo.buildStorageVolume(VolumeInfo.java:362)
                                                                                at com.android.server.MountService.getVolumeList(MountService.java:2758)
                                                                                at android.os.storage.IMountService$Stub.onTransact(IMountService.java:1676)
                                                                                at android.os.Binder.execTransact(Binder.java:453)
                                                                            # via Binder call with stack:
                                                                            android.os.StrictMode$LogStackTrace
                                                                                at android.os.StrictMode.readAndHandleBinderCallViolations(StrictMode.java:1911)
                                                                                at android.os.Parcel.readExceptionCode(Parcel.java:1601)
                                                                                at android.os.Parcel.readException(Parcel.java:1570)
                                                                                at android.os.storage.IMountService$Stub$Proxy.getVolumeList(IMountService.java:790)
                                                                                at android.os.storage.StorageManager.getVolumeList(StorageManager.java:883)
                                                                                at android.os.Environment$UserEnvironment.getExternalDirs(Environment.java:83)
                                                                                at android.os.Environment$UserEnvironment.buildExternalStorageAppFilesDirs(Environment.java:127)
                                                                                at android.os.Environment.buildExternalStorageAppFilesDirs(Environment.java:539)
                                                                                at android.app.ContextImpl.getExternalFilesDirs(ContextImpl.java:465)
                                                                                at android.app.ContextImpl.getExternalFilesDir(ContextImpl.java:458)
                                                                                at android.content.ContextWrapper.getExternalFilesDir(ContextWrapper.java:213)
                                                                                at android.content.ContextWrapper.getExternalFilesDir(ContextWrapper.java:213)
                                                                                at com.mattprecious.telescope.TelescopeLayout.getScreenshotFolder(TelescopeLayout.java:392)
                                                                                at com.mattprecious.telescope.TelescopeLayout.<init>(TelescopeLayout.java:138)
                                                                                at com.mattprecious.telescope.TelescopeLayout.<init>(TelescopeLayout.java:80)
                                                                                at com.mattprecious.telescope.TelescopeLayout.<init>(TelescopeLayout.java:76)
                                                                                ...
                                                                                at android.app.Instrumentation.callActivityOnPostCreate(Instrumentation.java:1189)
                                                                                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2398)
                                                                                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                at android.app.ActivityThread.access$900(ActivityThread.java:150)
                                                                                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                at android.os.Looper.loop(Looper.java:148)
                                                                                at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                at java.lang.reflect.Method.invoke(Native Method)
                                                                                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:764)
                                                                                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
mattprecious / telescope

Initializing TelescopeLayout causes StrictMode violations #52
