Fix some warnings

...c/com/android/inputmethod/compat/SuggestionSpanUtils.java

...ndroid/inputmethod/dictionarypack/DictionaryProvider.java

...android/inputmethod/dictionarypack/DictionaryService.java

.../com/android/inputmethod/dictionarypack/EventHandler.java

.../android/inputmethod/keyboard/internal/KeyboardState.java

...om/android/inputmethod/keyboard/internal/MatrixUtils.java

...android/inputmethod/keyboard/internal/SmoothingUtils.java

...com/android/inputmethod/latin/BinaryDictionaryGetter.java

...android/inputmethod/latin/makedict/BinaryDictIOUtils.java

.../android/inputmethod/latin/makedict/FusionDictionary.java

...thod/latin/personalization/PersonalizationDictionary.java

.../personalization/PersonalizationPredictionDictionary.java

...com/android/inputmethod/latin/settings/DebugSettings.java

...om/android/inputmethod/latin/settings/SettingsValues.java

...d/latin/userdictionary/UserDictionaryAddWordFragment.java

java/src/com/android/inputmethod/latin/utils/CsvUtils.java

...droid/inputmethod/latin/utils/UsabilityStudyLogUtils.java

java/src/com/android/inputmethod/research/MainLogBuffer.java

...c/com/android/inputmethod/research/MotionEventReader.java

.../src/com/android/inputmethod/research/ResearchLogger.java