function AndroidFirstStarBool:Boolean;

var

  PackageInfo:JPackageInfo;

  currentVersion,lastVersion:Integer;

begin

  PackageInfo:=SharedActivityContext.getPackageManager.getPackageInfo(SharedActivityContext.getPackageName, 0);

  currentVersion:=PackageInfo.versionCode;

  lastVersion:=SharedPrivatePreferences.getInt(StringToJString('VERSION_KEY'), 0);

  if currentVersion>lastVersion then

  begin

    //第一次启动

    SharedPrivatePreferences.edit.putInt(StringToJString('VERSION_KEY'),currentVersion);

    Result:=True;

  end

  else

  begin

    //不是第一次启动

    Result:=False;

  end;

end;

https://blog.csdn.net/xubzhlin/article/details/46633057