向PackageMangerService查找activity并启动

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先创建个intent,再通过inten.resolveActivityInfo向PackageManager查找对应activity的信息,PackageManager在被SystemServer创建初始化时会从系统中扫描当前系统已安装的所有apk信息并保存。

intent.resolveActivityInfo

如HOME启动:

创建一个CATEGORY_HOME类型的Intent，然后通过Intent.resolveActivityInfo函数向PackageManagerService查询Category类型为HOME的Activity。

        intent.addCategory(Intent.CATEGORY_HOME);        //intent.setClassName("com.xx.bootactivity", "com.xx.bootactivity.BootActivity");         ActivityInfo aInfo =  intent.resolveActivityInfo(mContext.getPackageManager(),                    STOCK_PM_FLAGS);        if (aInfo != null) {            intent.setComponent(new ComponentName(                    aInfo.applicationInfo.packageName, aInfo.name));            // Don't do this if the home app is currently being            // instrumented.            ProcessRecord app = getProcessRecordLocked(aInfo.processName,                    aInfo.applicationInfo.uid);            if (app == null || app.instrumentationClass == null) {                intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);                mMainStack.startActivityLocked(null, intent, null, null, 0, aInfo,                        null, null, 0, 0, 0, false, false, null);            }