vault backup: 2025-08-20 14:35:48

Affected files: Too many files to list
2025-08-20 14:35:48 +08:00
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+## am
+### start
+用`am start`來打開一個activity，例：
+```
+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，例：
+```
+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"
+```