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Add instructions for APEX to be bulit from mutliple branches and support

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multiple targets.

Test: on device tests.
Ignore-AOSP-First: nearby_not_in_aosp_yet
Change-Id: I82c619f288f01814889d34f71b362408e78703b6
This commit is contained in:
Chen Wang 2022-10-28 22:48:21 +00:00
commit 669871be12
1 changed files with 22 additions and 2 deletions
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@ -40,9 +40,9 @@ Then, add the jar in IDE as below.
1. Menu: File > Project Structure
2. Select Modules at the left panel and select the Dependencies tab.
3. Select the + icon and select 1 JARs or Directories option.
4. Select the JAR file found above.
4. Select the JAR file found above, make sure it is checked in the beginning square.
5. Click the OK button.
6. Restart the IDE to index.
6. Restart the IDE to re-index.
## Build and Install
@ -54,3 +54,23 @@ $ $ANDROID_BUILD_TOP/out/host/linux-x86/bin/deapexer decompress --input \
--output /tmp/tethering.apex
$ adb install -r /tmp/tethering.apex
```
## Build and Install from tm-mainline-prod branch
When build and flash the APEX from tm-mainline-prod, you may see the error below.
```
[INSTALL_FAILED_VERSION_DOWNGRADE: Downgrade of APEX package com.google.android.tethering is not allowed. Active version: 990090000 attempted: 339990000])
```
This is because the device is flashed with AOSP built from master or other branches, which has
prebuilt APEX with higher version. We can use root access to replace the prebuilt APEX with the APEX
built from tm-mainline-prod as below.
1. adb root && adb remount; adb shell mount -orw,remount /system/apex
2. cp tethering.next.apex com.google.android.tethering.apex
3. adb push com.google.android.tethering.apex /system/apex/
4. adb reboot
After the steps above, the APEX can be reinstalled with adb install -r.
(More APEX background can be found in https://source.android.com/docs/core/ota/apex#using-an-apex.)
## Build APEX to support multiple platforms
If you need to flash the APEX to different devices, Pixel 6, Pixel 7, or even devices from OEM, you
can share the APEX by ```source build/envsetup.sh && lunch aosp_arm64-userdebug```. This can avoid
re-compiling for different targets.