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更新了新系统39,但android app不能安装,提示现有sdk为19 而app的sdk为21，请问怎么处理
什么机型，要是Jolla一代安卓虚拟机版本是低了，也不会在升级安卓虚拟机。
来自维基百科的android版本号与API level对应表，这样你懂了吧？ 解决方式是找一下你安装的软件的旧版，可以安装在4.4上面的
