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Android 4?????? Android ?????????
Android 4??????????????????????????????????????Android??????????????????????Android????????
Android???????????????????????Android???????????????????????Activity?BroadcastReceiver?Service?????????Android????????????????????????????????
?????Android???????????Android Studio???????????Android?????????Android Studio????????????????????????????????Android??????AndroidManifest.xml??????????????????????????????
?????????Activity?????????Activity??Android??????????????????????????onCreate?onStart?onPause????????????????????????????????????????
BroadcastReceiver?????????????????????????BroadcastReceiver?????????????????????Service?????????????????????????Service??????????????????????????
????????????layout.xml?????????????????????????????????????ConstraintLayout??????????????????????????????
??????????SharedPreferences?????????????SharedPreferences????????????????????????????????????
?????Android?????????????????????????????????????????????????????????Android?????????????????????????
??????????????Android?????????????????????????????
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