Why do most fields (class members) in Android tutorial start with `m`?

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This notation comes from AOSP (Android Open Source Project) Code Style Guidelines for Contributors:

Follow Field Naming Conventions

  • Non-public, non-static field names
    start with m.
  • Static field names start with s.
  • Other fields start with a lower case letter.
  • Public static final fields (constants) are ALL_CAPS_WITH_UNDERSCORES.

Note that the linked style guide is for code to be contributed to the Android Open Source Project.

It is not a style guide for the code of individual Android apps.

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