android – How to resolve multiple D8 warnings: <Class X> was not found, it is required for default or static interface methods desugaring <Class Y>?-ThrowExceptions

Exception or error: After upgrading to Android Gradle Plugin from 3.1.4 to 3.2.x I’m getting multiple warnings such as: D8: Type `com.google.gson.reflect.TypeToken` was not found, it is required for default or static interface methods desugaring of `com.google.gson.reflect.TypeToken org.springframework.http.converter.json.GsonHttpMessageConverter.getTypeToken(java.lang.reflect.Type)` D8: Type `com.squareup.okhttp.MediaType` was not found, it is required for default or static interface methods desugaring of …

methods – Android: Call super() at the beginning or end of onStart(), onStop(), onDestroy() in activity?-ThrowExceptions

Exception or error: Where in onStart(), onStop(), onDestroy() of an activity do I call super.onStart(), super.onStop(), super.onDestroy() ? How to solve: That’s my way of calling these super methods: OnCreate(): Definitely the first thing. OnDestroy(): The last thing. OnStop(): The last thing. However, for the last two, no matter where you call them (in most …

android – methods in foreach and for loops in java-ThrowExceptions

Exception or error: My question is regarding optimization in java using the Android compiler. Will map.values() in the following be called every iteration, or will the Android compiler optimize it out. LinkedHashMap<String, Object> map; for (Object object : map.values()) { //do something with object } Likewise here is another example. will aList.size() be called every …

Android O API 26. Newly added Location methods don't work as needed-ThrowExceptions

Exception or error: I’m using Android O Developer preview 4 – API 26 Device – Google Pixel XL And seems like the new features such as: hasSpeedAccuracy() always returns false getSpeedAccuracyMetersPerSecond() always returns 0.0 getBearingAccuracyDegrees() always returns 0.0 for both fused and gps location providers. I’ve tried it while was moving in the car. So …

android – Which Activity lifecycle methods are best to register/unregister to event bus?-ThrowExceptions

Exception or error: What is the best place to register and unregister to an event bus (like otto, EventBus, or tinybus) in an Activity and why? onCreate()-onDestroy() onStart()-onStop() onResume()-onPause() Otto’s example uses onResume()-onPause(), EventBus’s mentions onStart()-onStop(), and we needed to use onCreate()-onDestroy() in our app to update the activity’s UI even when it was in …