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## am
### start
`am start`來打開一個activity
```
adb shell am start -S com.logitech.sentineliq/.MainActivity --es cameraId 0
```
其中`-S`是指先停止app再打開app。還有其他的命令如下
```
-D: enable debugging
-W: wait for launch to complete
--start-profiler <FILE>: start profiler and send results to <FILE>
-P <FILE>: like above, but profiling stops when app goes idle
-R: repeat the activity launch <COUNT> times. Prior to each repeat,
the top activity will be finished.
-S: force stop the target app before starting the activity
--opengl-trace: enable tracing of OpenGL functions
```
### 參考
- [Android activity manager "am" command help](https://gist.github.com/tsohr/5711945)
## pm
### list packages
列出所有安裝的apk
```bash
adb shell pm list packages
```
只列出 user 自己安裝的 apk:
```bash
adb shell "pm list packages -3"
```
## Forward
ADB forward用來把PC端收到的TCP轉到Android去這樣就可以透過USB ADB達到網路的功能。
例:
```
adb forward tcp:6100 tcp:7100
```
上述等於:
```
PC Android
http://127.0.0.1:6100 APP(port: 8080)
| |
| |
V----------> ADB(USB)----------->
```
Android端所回應的HTTP封包也會經由原路回來但是如果Android端要發一個request的話PC端就收不到了必須經由[[ADB#Reverse]]才行。
### 參考
* [Android Debug Bridge (adb)  |  Android Developers](https://developer.android.com/studio/command-line/adb#forwardports)
## Reverse
ADB reverse用來監聽Android端收到的request假設今天在Android APP上寫一個`http://127.0.0.1:8080/say/message`並希望PC端可以收到的話就可以用reverse來操作
```
adb reverse tcp:8081 tcp:8080
```
也就是說Android那邊發過來的封包會送交給PC這邊的port 8081。因此PC端還需要寫一個Server來監聽8081才行。
### 參考
* [adb命令-adb reverse的研究-有解無憂](https://www.uj5u.com/qita/277742.html)
## Logcat
- Enlarge logcat buffer to 16M: `adb logcat -G 16M`
## Get foreground activity
#android #foreground #activity
```
adb shell "dumpsys activity activities | grep ResumedActivity"
```