1. 폰트 크기 설정 : File -> Settings(Ctrl+Alt+S)
    1. Editor -> General
    2. Mouse의 Change font size (Zoom) with Ctrl+Mouse Wheel 체크
  2. 오류발생 : Installation failed with message Invalid File : …
    1. Build -> Clean Project
    2. Build -> Rebuild Project
    3. Build -> Build APK
    4. RUN
    5. 여전히 문제가 있으면
      1. File -> Setting -> Build, Execution, Deployment -> Instant Run -> Enable Instant Run to hot swap code의 체크 해지
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