| # Chromoting Android Hacking |
| |
| This guide, which is meant to accompany the |
| [compilation guide](old_chromoting_build_instructions.md), explains the process of |
| viewing the logs and debugging the CRD Android client. I'll assume you've |
| already built the APK as described in the aforementioned guide, that you're in |
| the `src/` directory, and that your binary is at |
| `out/Release/apks/Chromoting.apk`. Additionally, you should have installed the |
| app on at least one (still) connected device. |
| |
| [TOC] |
| |
| ## Viewing logging output |
| |
| In order to access LogCat and view the app's logging output, we need to launch |
| the Android Device Monitor. Run `third_party/android_sdk/public/tools/monitor` |
| and select the desired device under `Devices`. Using the app as normal will |
| display log messages to the `LogCat` pane. |
| |
| ## Attaching debuggers for Java code |
| |
| ### Eclipse |
| |
| 1. Go to https://developer.android.com/sdk/index.html and click "Download the |
| SDK ADT Bundle for Linux" |
| 1. Configure eclipse |
| 1. Select General > Workspace from the tree on the left. |
| 1. Uncheck Refresh workspace on startup (if present) |
| 1. Uncheck Refresh using native hooks or polling (if present) |
| 1. Disable build before launching |
| 1. Select Run/Debug > Launching |
| 1. Uncheck Build (if required) before launching |
| 1. Create a project |
| 1. Select File > New > Project... from the main menu. |
| 1. Choose Java/Java Project |
| 1. Eclipse should have generated .project and perhaps a .classpath file in |
| your <project root>/src/ directory. |
| 1. Replace/Add the .classpath file with the content from Below. Remember |
| that the path field should be the location of the chromium source |
| relative to the current directory of your project. |
| |
| ```xml |
| <?xml version="1.0" encoding="UTF-8"?> |
| <classpath> |
| <classpathentry kind="src" path="net/test/android/javatests/src"/> |
| <classpathentry kind="src" path="net/android/java/src"/> |
| <classpathentry kind="src" path="net/android/javatests/src"/> |
| <classpathentry kind="src" path="base/test/android/java/src"/> |
| <classpathentry kind="src" path="base/test/android/javatests/src"/> |
| <classpathentry kind="src" path="base/android/jni_generator/java/src"/> |
| <classpathentry kind="src" path="base/android/java/src"/> |
| <classpathentry kind="src" path="base/android/javatests/src"/> |
| <classpathentry kind="src" path="components/cronet/android/java/src"/> |
| <classpathentry kind="src" path="components/cronet/android/sample/src"/> |
| <classpathentry kind="src" path="components/cronet/android/sample/javatests/src"/> |
| <classpathentry kind="src" path="components/autofill/core/browser/android/java/src"/> |
| <classpathentry kind="src" path="components/embedder_support/android/java/src"/> |
| <classpathentry kind="src" path="components/dom_distiller/android/java/src"/> |
| <classpathentry kind="src" path="components/navigation_interception/android/java/src"/> |
| <classpathentry kind="src" path="ui/android/java/src"/> |
| <classpathentry kind="src" path="media/base/android/java/src"/> |
| <classpathentry kind="src" path="chrome/test/android/unit_tests_apk/src"/> |
| <classpathentry kind="src" path="chrome/test/android/javatests/src"/> |
| <classpathentry kind="src" path="chrome/test/chromedriver/test/webview_shell/java/src"/> |
| <classpathentry kind="src" path="chrome/common/extensions/docs/examples/extensions/irc/servlet/src"/> |
| <classpathentry kind="src" path="chrome/android/java/src"/> |
| <classpathentry kind="src" path="chrome/android/uiautomator_tests/src"/> |
| <classpathentry kind="src" path="chrome/android/javatests/src"/> |
| <classpathentry kind="src" path="sync/test/android/javatests/src"/> |
| <classpathentry kind="src" path="sync/android/java/src"/> |
| <classpathentry kind="src" path="sync/android/javatests/src"/> |
| <classpathentry kind="src" path="mojo/public/java/base/src"/> |
| <classpathentry kind="src" path="mojo/public/java/bindings/src"/> |
| <classpathentry kind="src" path="mojo/public/java/system/javatests/src"/> |
| <classpathentry kind="src" path="mojo/public/java/system/src"/> |
| <classpathentry kind="src" path="testing/android/java/src"/> |
| <classpathentry kind="src" path="printing/android/java/src"/> |
| <classpathentry kind="src" path="tools/binary_size/java/src"/> |
| <classpathentry kind="src" path="tools/android/memconsumer/java/src"/> |
| <classpathentry kind="src" path="remoting/android/java/src"/> |
| <classpathentry kind="src" path="remoting/android/apk/src"/> |
| <classpathentry kind="src" path="remoting/android/javatests/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/voice_engine/test/android/android_test/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/modules/video_capture/android/java/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/modules/video_render/android/java/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/modules/audio_device/test/android/audio_device_android_test/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/modules/audio_device/android/java/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/examples/android/media_demo/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/examples/android/opensl_loopback/src"/> |
| <classpathentry kind="src" path="third_party/webrtc/video_engine/test/auto_test/android/src"/> |
| <classpathentry kind="src" path="third_party/libjingle/source/talk/app/webrtc/java/src"/> |
| <classpathentry kind="src" path="third_party/libjingle/source/talk/app/webrtc/javatests/src"/> |
| <classpathentry kind="src" path="third_party/libjingle/source/talk/examples/android/src"/> |
| <classpathentry kind="src" path="android_webview/java/src"/> |
| <classpathentry kind="src" path="android_webview/test/shell/src"/> |
| <classpathentry kind="src" path="android_webview/unittestjava/src"/> |
| <classpathentry kind="src" path="android_webview/javatests/src"/> |
| <classpathentry kind="src" path="chrome/test/android/browsertests_apk/src"/> |
| <classpathentry kind="src" path="components/test/android/browsertests_apk/src"/> |
| <classpathentry kind="src" path="content/public/test/android/javatests/src"/> |
| <classpathentry kind="src" path="content/public/android/java/src"/> |
| <classpathentry kind="src" path="content/public/android/javatests/src"/> |
| <classpathentry kind="src" path="content/shell/android/browsertests_apk/src"/> |
| <classpathentry kind="src" path="content/shell/android/java/src"/> |
| <classpathentry kind="src" path="content/shell/android/shell_apk/src"/> |
| <classpathentry kind="src" path="content/shell/android/javatests/src"/> |
| <classpathentry kind="src" path="content/shell/android/linker_test_apk/src"/> |
| <classpathentry kind="lib" path="third_party/android_sdk/public/platforms/android-27/data/layoutlib.jar"/> |
| <classpathentry kind="lib" path="third_party/android_sdk/public/platforms/android-27/android.jar"/> |
| <classpathentry kind="output" path="out/bin"/> |
| </classpath> |
| ``` |
| |
| 1. Obtain the debug port |
| 1. Go to Window > Open Perspective > DDMS |
| 1. In order for the app org.chromium.chromoting to show up, you must build |
| Debug instead of Retail |
| 1. Note down the port number, should be 8600 or 8700 |
| 1. Setup a debug configuration |
| 1. Go to Window > Open Perspective > Debug |
| 1. Run > Debug > Configurations |
| 1. Select "Remote Java Application" and click "New" |
| 1. Put Host: localhost and Port: <the port from DDMS> |
| 1. Hit Debug |
| 1. Configure source path |
| 1. Right click on the Chromoting [Application](Remoting.md) and select Edit |
| source Lookup Path |
| 1. Click "Add" and select File System Directory |
| 1. Select the location of your chromium checkout, |
| e.g. <project root>/src/remoting/android |
| 1. Debugging |
| 1. To add a breakpoint, simply open the source file and hit Ctrl+Shift+B to |
| toggle the breakpoint. Happy hacking. |
| |
| ### Command line debugger |
| |
| With the Android Device Monitor open, look under `Devices`, expand the entry for |
| the device on which you want to debug, and select the entry for |
| `org.chromium.chromoting` (it must already be running). This forwards the JVM |
| debugging connection to your local port 8700. In your shell, do `$ jdb -attach |
| localhost:8700`. |
| |
| ## Attaching GDB to debug native code |
| |
| The Chromium build system provides a convenience wrapper script that can be used |
| to easily launch GDB. Run |
| |
| ```shell |
| $ build/android/adb_gdb --package-name=org.chromium.chromoting \ |
| --activity=.Chromoting --start |
| ``` |
| |
| Note that if you have multiple devices connected, you must export |
| `ANDROID_SERIAL` to select one; set it to the serial number of the desired |
| device as output by `$ adb devices`. |
