https://qooah.com/2015/06/08/%e3%80%90%e6%90%b6%e5%85%88%e8%a9%a6%e3%80%91%e5%85%8d-root-%e6%a9%9f-%e5%8d%b3%e7%8e%a9-android-m-launcher%e9%99%84%e4%b8%8b%e8%bc%89/