android如何禁止安装第三方应用

在PackageManagerService.java installPackageLI 函数做处理

private void installPackageLI(InstallArgs args, PackageInstalledInfo res) {    final int installFlags = args.installFlags;    final String installerPackageName = args.installerPackageName;    final String volumeUuid = args.volumeUuid;    final File tmpPackageFile = new File(args.getCodePath());    final boolean forwardLocked = ((installFlags & PackageManager.INSTALL_FORWARD_LOCK) != 0);    final boolean onExternal = (((installFlags & PackageManager.INSTALL_EXTERNAL) != 0)            || (args.volumeUuid != null));    final boolean instantApp = ((installFlags & PackageManager.INSTALL_INSTANT_APP) != 0);    final boolean fullApp = ((installFlags & PackageManager.INSTALL_FULL_APP) != 0);    final boolean forceSdk = ((installFlags & PackageManager.INSTALL_FORCE_SDK) != 0);    final boolean virtualPreload =            ((installFlags & PackageManager.INSTALL_VIRTUAL_PRELOAD) != 0);    boolean replace = false;    @ScanFlags int scanFlags = SCAN_NEW_INSTALL | SCAN_UPDATE_SIGNATURE;    /*meig:jicong.wang add for task 4616 start {@*/    if (mSystemReady) {        if (!SystemProperties.getBoolean("persist.sys.installed", false)) {            res.setReturnCode(PackageManager.INSTALL_FAILED_INVALID_APK);            return;        }    }    /*meig:jicong.wang add for task 4616 end @}*/

同时添加persist.sys.installed 来控制是否开发安装app应用。

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