平台放开BOOT_COMPLETED广播接收
android3.1以后开机自启动受限制，没有手动启动过的程序，收不到开机广播
修改方法：
在AMS发BOOT_COMPLETED广播的地方加上intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES已经停止的应用也收能收到这个广播
注意事项：
1.安装在sdcard的应用收不到广播，sdcard挂载晚
2.系统开启了FastBoot模式，系统启动并不会发送BOOT_COMPLETED广播
3.自启动时间晚，可以调高广播接收的优先级
<intent-filterandroid:priority="1000">
//可以提前开机自启动时间-1000----1000
<actionandroid:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
android:priority
Theprioritythatshouldbegiventotheparentcomponentwithregardtohandlingintentsofthetypedescribedbythefilter.Thisattributehasmeaningforbothactivitiesandbroadcastreceivers:
Itprovidesinformationabouthowableanactivityistorespondtoanintentthatmatchesthefilter,relativetootheractivitiesthatcouldalsorespondtotheintent.Whenanintentcouldbehandledbymultipleactivitieswithdifferentpriorities,Androidwillconsideronlythosewithhigherpriorityvaluesaspotentialtargetsfortheintent.
Itcontrolstheorderinwhichbroadcastreceiversareexecutedtoreceivebroadcastmessages.Thosewithhigherpriorityvaluesarecalledbeforethosewithlowervalues.(Theorderappliesonlytosynchronousmessages;it'signoredforasynchronousmessages.)
Usethisattributeonlyifyoureallyneedtoimposeaspecificorderinwhichthebroadcastsarereceived,orwanttoforceAndroidtopreferoneactivityoverothers.
Thevaluemustbeaninteger,suchas"100".Highernumbershaveahigherpriority.Thedefaultvalueis0.Thevaluemustbegreaterthan-1000andlessthan1000.
AlsoseesetPriority().