[Solved]Bundle big binary file into android apk

[tham]

Qt5.9.1
os : win10 64bits

How could I bundle a big binary file(over 20MB) into the apk and load it later from android device?Thanks

[SGaist]

Hi,

The Assets file system looks like what you want to use.

Hope it helps

[tham]

@SGaist
I try two solutions, both of them fail

project layout

android
extra_data
  --MobileNetSSD_deploy.caffemodel
  --MobileNetSSD_deploy.prototxt
assets
  --Samples
    --MobileNetSSD_deploy.caffemodel
    --MobileNetSSD_deploy.prototxt
logics
main.cpp
main.qml
Page1.qml
Page1Form.ui.qml
part1.pro
qml.qrc
qtquickcontrols2.conf

android studio: 2.3.3.3
android api : 25(I want to pick a lower api, but cannot)
Qt5.9.1
os : win10 64bits

Add following lines to .pro

SAMPLES_INSTALL_PATH=/assets/Samples

# - setup the 'make install' step
SAMPLE_FILES += $${SAMPLES_INSTALL_PATH}/MobileNetSSD_deploy.caffemodel
SAMPLE_FILES += $${SAMPLES_INSTALL_PATH}/MobileNetSSD_deploy.prototxt
samples.path = $${SAMPLES_INSTALL_PATH}
samples.files += $${SAMPLE_FILES}
samples.depends += FORCE

INSTALLS += samples

folder_01.source = extra_data
folder_01.target = extra_data
DEPLOYMENTFOLDERS += folder_01

None of them work, because the folder after build(without deploy) remain the same size with or without DEPLOYMENTFOLDERS or INSTALLS(extra files are bigger than 20MB)

[SGaist]

From a quick look: SAMPLES_INSTALL_PATH is an absolute path so samples point to an invalid file list.

[tham]

@SGaist I change it to

SAMPLES_INSTALL_PATH=$$PWD/assets/Samples

This time pop out error message

17:21:00: Starting: "C:\Users\rrrr\Qt\3rdLibs\Qt\digia\Tools\mingw530_32\bin\mingw32-make.exe" "INSTALL_ROOT=C:\Users\rrrr\Qt\blogCodes2\cross_platform_dl\build-part3\android-build" install
The filename, directory name, or volume label syntax is incorrect.
Makefile:3015: recipe for target 'install_samples' failed
mingw32-make: *** [install_samples] Error 1
17:21:02: The process "C:\Users\rrrr\Qt\3rdLibs\Qt\digia\Tools\mingw530_32\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project part3 (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.9.1 for Android armv7))
When executing step "Copy application data"

[SGaist]

AFAICS, you are using the same path to list the files and for the target directory. You should separate both. There's no C: drive on Android devices.

[tham]

I found a way to do it

1 : Click android folder(This folder will be created if you click the create template button on QtCreator)
2 : Copy your assets folder into the android folder
3 : Add following lines to you pro file

ANDROID_PACKAGE_SOURCE_DIR = android
DISTFILES += $$ANDROID_PACKAGE_SOURCE_DIR/assets

4 : The file in your assets cannot is compressed and cannot access by another library like opencv, std::ifstream etc. You have two solutions to open them

1 : Download your resources to your system the first time you run your program
2 : change suffix of your files as mp3, this can prevent compression of your assets. After that, copy the assets to somewhere you can access for anohter library to read them(ex : opencv)