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Android???????????

????Android?????????????????????????????????????????????????????????????????????????????????

??APP????

1. ????????

?????????????????????????????????????????????????????????????????

• ????????????????????windowBackground????????????????windowIsTranslucent????????Splash??????????????????
• ???????????Application???????AMS?Zygote?ActivityThread?????????attachBaseContext?onCreate??????????
• ??????????TreaceView????????????????????????????IntentService?????Redex????????

2. ??????

????????????????50%???????Android???????????????

??App?????

1. ???????

??????????????????Crash?????????????????????????????????????

2. ???????

• ????????????????????????????
• ???????LeakCanary????????????????
• ???????Choreographer????????????

3. ???????

• ????????????????????????????
• ????????????????????????????????

4. ??????

• ???????????????????
• ????????????????????????
• ????????????????????????????????

??????

1. ?????OOM??

??????????????????????OOM?????????????

• ???????LeakCanary??????????Cursor?File?????????
• OOM?????static final??????????????????+=???
• ?????????????????????????

2. ??????

????ImageView??????????????????????????????

??????

1. ??????

????Choreographer?LayoutInflaterCompat?LayoutInspector?Systrace??????AOP????????????????

2. ??????

• ?????????AsyncLayoutInflater????????
• X2C?????APT??XML???Java????????IO???
• ConstraintLayout???????????????????

3. ??????

????????????????50%??????FPS???10%.

??????

1. ??????

• ???????keep-alive??????????
• ?????????????????????????
• ???????Gzip?????????

2. DNS??

??HTTPDNS?????DNS????????????

??????

1. ??????

????SharedPreferences?File?SQLite???????????????

• SharedPreferences?????edit()?????????????
• SQLite????????????????????????

2. ??????

???????????????????????????????

?????View??

1. View????

• ??invalidate???????4??invalidate????????
• ????????????ViewGroup??????????????

2. ??????

??????????????draw???????????

??????

1. ??????

???????????????????????mmap???????????

2. ??????

??????mmap????????????CPU???

??APK????

1. APK????

• ???????vector drawable?webp????????????
• ?????????dex???Redex??????????????
• ???????????static final?????????

2. ??????

?????????APK???80M???50M?

??WebView??

1. WebView????

WebView???????????????????????

2. ????

• ???WebView???JavaScript???WebView???
• ??????????????WebView????????
• ??????????????????????????

??

?????????????????????????????????????????????????????????Android???????????????????????????????