替换虚拟机Launcher
1、启动模拟器
2、赋予权限（重新挂载系统分区，使系统分区重新可写）
root@meie:~# adb remount
3、删除Launcher2.apk
root@meie:~# adb shell# cd system# cd app# rm Launcher2.apk
?4、卸载Launcher
root@meie:~# adb uninstall com.android.launcher
?5、安装新Launcher
root@meie:~# adb install '/work/official/out/target/product/generic/system/app/Launcher2.apk' 2213 KB/s (893174 bytes in 0.394s)pkg: /data/local/tmp/Launcher2.apkSuccess
?注意：只删除apk文件不卸载的话，会残留数据，安装新Launcher报错误
Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
