markzhai/AndroidPerformanceMonitor

java.io.FileNotFoundException

Open

#80 opened on Dec 11, 2016

View on GitHub
 (6 comments) (0 reactions) (0 assignees)Java (6,609 stars) (1,028 forks)batch import
enhancementhelp wanted

Description

E/LogWriter: save: 
 java.io.FileNotFoundException: /data/com.github.piasy.bootstrap/performance/looper-2016-12-11_23-48-25.844.log (No such file or directory)
     at java.io.FileOutputStream.open(Native Method)
     at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
     at java.io.FileOutputStream.<init>(FileOutputStream.java:140)
     at com.github.moduth.blockcanary.LogWriter.save(LogWriter.java:108)
     at com.github.moduth.blockcanary.LogWriter.save(LogWriter.java:56)
     at com.github.moduth.blockcanary.BlockCanaryInternals$1.onBlockEvent(BlockCanaryInternals.java:63)
     at com.github.moduth.blockcanary.LooperMonitor$1.run(LooperMonitor.java:74)
     at android.os.Handler.handleCallback(Handler.java:751)
     at android.os.Handler.dispatchMessage(Handler.java:95)
     at android.os.Looper.loop(Looper.java:154)
     at android.os.HandlerThread.run(HandlerThread.java:61)

Contributor guide

Tech stack
javaandroid
Domain
mobileperformance
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
basic Android file I/O knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the file path creation in LogWriter.save() at line 108. The error indicates the directory '/data/com.github.piasy.bootstrap/performance/' might not exist before creating the file. Check if the parent directory is created before opening FileOutputStream. Consider using File.getParentFile().mkdirs() to ensure the path exists.