First impressions on Android programming

During the holidays I could have a chance to dig into Android programming and got some short thought. I share them here, hoping that these would help someone else.

• The programming environment of Android is literally fantastic. Now I can understand why a lot of companies are seriously considering Android in their embedded environment.
• Java is...... too slow(OTL). Damn slow. I can't wait for the delay
• I could, eventually, build Qt for Android in Windows
• Build environment: Qt 5.9.2 + SDK Level 19 + NDK r15c + BuildTools 26.0.2 + JDK 8 + Windows 10 64bit (find_java.bat in Android SDK can't find JDK 9. -_-)
• Qt Creator 4.4.0 can't recognize SDK Buildtools 26.X. At least 4.4.1 is needed
• QTextToSpeech seems to fix the locale to system in Android, and can't be changed(In Java you can). However, considering that I accidentally hear TTS in other locale in the app, we may have some change(or it may be simply and error)