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.apk
Success

 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]