点击一个应用的日志，自己闪退

[liyufan]

FATAL EXCEPTION: main
 Process: com.alcatraz.fclogcat, PID: 27729
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.alcatraz.fclogcat/com.alcatraz.fclogcat.LogViewer}: java.lang.NullPointerException
 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2767)
 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2853)
 	at android.app.ActivityThread.-wrap12(ActivityThread.java)
 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1557)
 	at android.os.Handler.dispatchMessage(Handler.java:102)
 	at android.os.Looper.loop(Looper.java:154)
 	at android.app.ActivityThread.main(ActivityThread.java:6369)
 	at java.lang.reflect.Method.invoke(Native Method)
 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
 Caused by: java.lang.NullPointerException
 	at java.io.File.<init>(File.java:262)
 	at com.alcatraz.fclogcat.LogViewer.initViews(LogViewer.java:237)
 	at com.alcatraz.fclogcat.LogViewer.onCreate(LogViewer.java:59)
 	at android.app.Activity.performCreate(Activity.java:6760)
 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2720)
 	... 9 more