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[Solved]Bundle big binary file into android apk

  • 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

  • Lifetime Qt Champion


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

    Hope it helps

  • @SGaist
    I try two solutions, both of them fail

    project layout


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

    Add following lines to .pro

    # - 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 = 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)

  • Lifetime Qt Champion

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

  • @SGaist I change it to


    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"

  • Lifetime Qt Champion

    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.

  • 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


    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)

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