Comprehensive Guide to Android App Packet Capture Using an Emulator, ADB, Charles, and Fiddler

This article provides an end‑to‑end guide for performing Android app packet capture using a computer‑based Android emulator combined with web debugging proxy tools, enabling functional, security, and development testing without a physical device.

Step 1: Install an Android emulator – The guide recommends the NetEase MuMu emulator (or similar) that supports Wi‑Fi proxy configuration; the installation process is omitted for brevity.

Step 2: Install the app on the emulator – The app can be installed through the emulator’s UI (App Center or APK installer) or via ADB. Example command: $ adb -s emulator-5554 install /Users/fanjiapeng/Downloads/360freewifi_beta.apk

Step 3: Install web debugging proxy tools – Two popular proxies are covered: Charles and Fiddler Everywhere. Installation steps are briefly described, and the UI of each tool is shown.

Configure proxy settings on the emulator – Set the emulator’s WLAN proxy to the host IP and the proxy’s listening port (e.g., 8888 for Charles, 8866 for Fiddler). Install the proxy’s root certificate on the emulator to enable HTTPS decryption.

HTTPS capture on Android 7.0+ – For Android 7.0 and above, the device must be rooted, the proxy’s PEM certificate must be hashed and renamed (e.g., .0 ), and then copied to /system/etc/security/cacerts . The guide also shows how to handle read‑only filesystem errors.

Access control configuration – Two methods are presented: automatic IP whitelisting when the device first connects, and manual addition via the proxy’s Access Control Settings.

Start capturing traffic – After enabling HTTPS proxying, launch the target app in the emulator; the proxy will display all API requests, and detailed request/response data can be inspected.

Fiddler Everywhere specific steps – Similar proxy configuration, but the exported certificate is in .crt format and must be converted to .pem . Remote connections can be enabled to allow the emulator to reach the proxy.

Conclusion – The guide succinctly covers MuMu emulator setup, ADB installation and usage, multiple APK installation methods, and the installation and basic configuration of Charles and Fiddler Everywhere for Android app packet capture, noting that the process is analogous for iOS.