Slint android demo not working

[DennisZhangOiler]

I installed all the dependencies and run with cargo-apk, then following errors appeared:

❯ cargo apk run --target aarch64-linux-android --lib
Using package `android-demo` in `/home/dennis/code/rust/android-demo/Cargo.toml`
    Blocking waiting for file lock on build directory
   Compiling skia-bindings v0.78.2
   Compiling i-slint-backend-android-activity v1.8.0
   Compiling android-activity v0.6.0
   Compiling slint-macros v1.8.0
error: failed to run custom build command for `i-slint-backend-android-activity v1.8.0`

Caused by:
  process didn't exit successfully: `/home/dennis/code/rust/android-demo/target/debug/build/i-slint-backend-android-activity-7a90dec8f93068cc/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=ANDROID_HOME
  cargo:rerun-if-env-changed=JAVA_HOME

  --- stderr
  thread 'main' panicked at /home/dennis/.cargo/registry/src/mirrors.ustc.edu.cn-4affec411d11e50f/i-slint-backend-android-activity-1.8.0/build.rs:86:9:
  Java compilation failed: java/SlintAndroidJavaHelper.java:17: error: cannot find symbol
  import android.graphics.BlendMode;
                         ^
    symbol:   class BlendMode
    location: package android.graphics
  java/SlintAndroidJavaHelper.java:18: error: cannot find symbol
  import android.graphics.BlendModeColorFilter;
                         ^
    symbol:   class BlendModeColorFilter
    location: package android.graphics
  java/SlintAndroidJavaHelper.java:105: error: cannot find symbol
              drawable.setColorFilter(new BlendModeColorFilter(color, BlendMode.SRC_IN));
                                          ^
    symbol:   class BlendModeColorFilter
    location: class InputHandle
  java/SlintAndroidJavaHelper.java:105: error: cannot find symbol
              drawable.setColorFilter(new BlendModeColorFilter(color, BlendMode.SRC_IN));
                                                                      ^
    symbol:   variable BlendMode
    location: class InputHandle
  java/SlintAndroidJavaHelper.java:299: error: cannot find symbol
                  menu.setGroupDividerEnabled(true);
                      ^
    symbol:   method setGroupDividerEnabled(boolean)
    location: variable menu of type Menu
  5 errors

  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
Error: Command `AR_aarch64-linux-android=/usr/lib/android-sdk/ndk/android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar CARGO_ENCODED_RUSTFLAGS=-Clink-arg=--target=aarch64-linux-android23\u{1f}-L\u{1f}/home/dennis/code/rust/android-demo/target/cargo-apk-temp-extra-link-libraries CARGO_TARGET_AARCH64_LINUX_ANDROID_AR=/usr/lib/android-sdk/ndk/android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=/usr/lib/android-sdk/ndk/android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/bin/clang CC_aarch64-linux-android=/usr/lib/android-sdk/ndk/android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/bin/clang CFLAGS_aarch64-linux-android=--target=aarch64-linux-android23 CXXFLAGS_aarch64-linux-android=--target=aarch64-linux-android23 CXX_aarch64-linux-android=/usr/lib/android-sdk/ndk/android-ndk-r27c/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ cargo build --lib --target aarch64-linux-android` had a non-zero exit code.

[ogoffart]

What is your SDK and NDK version?

[DennisZhangOiler]

My colleague got it running but the APK size is big and performance not good.

[ogoffart]

Could you clarify a bit? What was the size of the APK you built, and what size would you consider acceptable? Also, when you mention the performance isn't good, could you provide more details about what specifically feels slow or unresponsive?

[DennisZhangOiler]

We build the weather demo and energy demo, the size of APKs are ~200MB, those are simple demos, to me it should be <20MB. The reason I feel slow is animation, especially on weather app, the details drop down with a slow animation and you can feel it's on low FPS, also on energy app, you can feel a little bit stuck on page switching.

[ogoffart]

Looks like something went wrong indeed.
The APK we build in our CI for the energy monitor is about 10M https://docs.slint.dev/latest/demos/android/energy-monitor.apk
Maybe it is a debug build?

[DennisZhangOiler]

Oh it is in debug mode, cause he didn't setup the Android keystore, there seems to be typo that causes weather APP APK could not upload, he might create a PR for it:)