Android Studio for Windows: Building drishti error

[ygyin-ivy]

when i build armeabi-v7a with minSdkVersion 19, there is a Building drishti error.
some cache file not found
https://raw.githubusercontent.com/elucideye/hunter-cache/master/1dac53e/drishti/684ad3fc824c77a5eb02c7a8f5ae6a5db011b678/684ad3f/c41b297/4830b34/da39a3e/basic-deps.DONE
arm64-v8a with minSdkVersion 24 passed.

hunter log
log.txt

cmake log
log.txt

[ruslo]

some cache file not found
https://raw.githubusercontent.com/elucideye/hunter-cache/master/1dac53e/drishti/684ad3fc824c77a5eb02c7a8f5ae6a5db011b678/684ad3f/c41b297/4830b34/da39a3e/basic-deps.DONE

It's not a error, if cache file not found then usually it means that we need to build package from sources.

when i build armeabi-v7a with minSdkVersion 19

Minimal SDK version is set to 24 currently:

• drishti/src/examples/facefilter/android-studio/app/build.gradle

  Line 32 in 8786b23

  minSdkVersion 24

Don't remember why, need to check. We do use Camera2 API hence minimal is at least 21 (Android 5.0), probably 24 is the version where Android ARM64 emulator is available.

I don't see what is the error exactly but I do remember that ARMv7 was not working with Android Studio on master branch, we do test Android NDK r17 ARMv7 but this test is for CMake based toolchain which is a little bit different and don't cover all the code.

[ygyin-ivy]

thx, minSdkVersion 24 is too high for my mobile.
maybe i can download drishti-v0.12.4-Darwin-android-ndk-r17-api-19-armeabi-v7a-neon-clang-libcxx-MinSizeRel.tar.gz and try again

[headupinclouds]

Don't remember why, need to check.

We started with the C++ camera interface, which required API 24, but it didn't work with SurfaceTextures. Maybe that was it?

Maybe arm64 + API 21 will work?

https://developer.android.com/ndk/guides/stable_apis#a24

We can add the requirements to the README.

[headupinclouds]

maybe i can download drishti-v0.12.4-Darwin-android-ndk-r17-api-19-armeabi-v7a-neon-clang-libcxx-MinSizeRel.tar.gz

You can build the cross platform native libs with that release, and it should build fine, but there is no Android Studio demo application in that release.

I will try the API 21 + arm64 build for the Android Studio app.

[ruslo]

Don't remember why, need to check

requestPermissions available since API 24:

• drishti/src/examples/facefilter/android-studio/app/src/main/java/com/elucideye/facefilter/FaceFilterCameraManager.java

  Lines 170 to 172 in 1f4cf85

  	mActivity.requestPermissions(
  	new String[] { Manifest.permission.CAMERA },
  	REQUEST_CAMERA_PERMISSION);

• https://developer.android.com/reference/android/support/v4/app/ActivityCompat#requestpermissions

I do remember that ARMv7 was not working with Android Studio

We just need NEON, fixed by #719

[headupinclouds]

requestPermissions available since API 24

https://developer.android.com/about/dashboards/

• 42.9% >= API 21
• 86.8% >= API 24

It is probably worth considering alternatives 43.1% more coverage (if we target API 21).

[headupinclouds]

thx, minSdkVersion 24 is too high for my mobile.

@ygyin-ivy : Can you run API 21?

[ygyin-ivy]

i can't test architecture arm64-v8a

[headupinclouds]

This was fixed by @ruslo in #719.

You can enable the armv7 targets here:

drishti/src/examples/facefilter/android-studio/app/build.gradle

Line 83 in 1f4cf85

include 'arm64-v8a'

drishti/src/examples/facefilter/android-studio/app/build.gradle

Line 105 in 1f4cf85

ext.abiCodes = ['arm64-v8a':4]

                //include 'x86_64', 'armeabi-v7a', 'arm64-v8a'
                include 'arm64-v8a'

                universalApk false
            }
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
    buildToolsVersion '27.0.3'
}

dependencies {
    implementation "com.android.support:support-v4:27.0.2"
    implementation "com.android.support:support-v13:27.0.2"
    implementation "com.android.support:cardview-v7:27.0.2"
    implementation "com.android.support:appcompat-v7:27.0.2"
}
 
//ext.abiCodes = ['x86_64':1, 'armeabi-v7a':3, 'arm64-v8a':4]
ext.abiCodes = ['arm64-v8a':4]

From @ruslo's comment above, you can probably reduce the sdk target to 21 if you find a workaround for the camera permission code block he highlighted above.

[ygyin-ivy]

i know where to enable armeabi-v7a.
as i mentioned above, there is a error when build armeabi-v7a with api 19.
i will try to build armeabi-v7a with api 21.

---

after a whole day building, it's still stuck with gradle building.

[headupinclouds]

I will try a Windows build this weekend. Can you post the CMake build logs?

src/examples/facefilter/android-studio/app/.externalNativeBuild/cmake/debug/arm64-v8a/cmake_build_command.txt
src/examples/facefilter/android-studio/app/.externalNativeBuild/cmake/debug/arm64-v8a/cmake_build_output.txt
src/examples/facefilter/android-studio/app/.externalNativeBuild/cmake/debug/arm64-v8a/cmake_server_log.txt