some android lint ref.

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

a few warnings have been fixed.

💡 Motivation and Context

warnings were annoying.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #51 into master will increase coverage by 0.6%.
The diff coverage is 6.38%.

@@             Coverage Diff             @@
##             master      #51     +/-   ##
===========================================
+ Coverage     38.13%   38.74%   +0.6%     
- Complexity      169      185     +16     
===========================================
  Files            51       51             
  Lines          1340     1368     +28     
  Branches         66       78     +12     
===========================================
+ Hits            511      530     +19     
- Misses          802      811      +9     
  Partials         27       27

Impacted Files	Coverage Δ	Complexity Δ
...e/src/main/java/io/sentry/core/EnvelopeReader.java	85.56% <ø> (-0.15%)	17 <0> (ø)
...src/main/java/io/sentry/core/DiagnosticLogger.java	92.85% <ø> (ø)	11 <0> (ø)	⬇️
...ntry-core/src/main/java/io/sentry/core/Sentry.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...-core/src/main/java/io/sentry/core/NoOpLogger.java	100% <100%> (ø)	5 <1> (ø)	⬇️
...entry-core/src/main/java/io/sentry/core/Scope.java	62.06% <100%> (+44.82%)	11 <1> (+10)	⬆️
sentry-core/src/main/java/io/sentry/core/Hub.java	18.18% <2.27%> (-8.97%)	4 <0> (ø)
...-core/src/main/java/io/sentry/core/Breadcrumb.java	19.04% <0%> (+19.04%)	3% <0%> (+3%)	⬆️
...re/src/main/java/io/sentry/core/protocol/User.java	22.22% <0%> (+22.22%)	3% <0%> (+3%)	⬆️

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