首先手机要先接到电脑上
并且开启 USB Debugging
之后步骤如下：
1. 执行：adb shell
2. 执行：pm
get-install-location
这时应该输出为 0 默认的位置
3. 执行：pm set-install-location 2
设定默认安装到 SD Card
0 [auto]: Let system decide the best location
1 [internal]: Install on internal device storage
2 [external]: Install on external media
1 [internal]: Install on internal device storage
2 [external]: Install on external media
参考来源：http://www.addictiveblogs.com/how-to-move-all-android-apps-to-sd-card-without-rooting-device/