adb 命令获取当前页面的Activity，启动某个Activity

每次找来找去太麻烦，再次记录一下

1. 获取当前页面的Activity

adb shell "dumpsys window | grep mCurrentFocus"

2. 启动某个Activity

 adb shell am start -n com.xxx.xxx/.MainActivity

3. 获取某个包的安装权限

 adb shell "dumpsys package xxx | grep 'permission'" > 1.txt

4. 通过包名找apk安装路径

adb shell "pm path com.xxx.xxx"