slint-ui/slint · error

No Android platforms found

Error message

No Android platforms found

What it means

Error "No Android platforms found" thrown in slint-ui/slint.

Source

Thrown at internal/backends/android-activity/build.rs:34

    // This is the only Java source file
    let java_src = "SlintAndroidJavaHelper.java";
    let java_src_path = format!("java/{java_src}");

    let slint_path: PathBuf = ["dev", "slint", "android-activity"].iter().collect();

    let out_dir: PathBuf = env::var_os("OUT_DIR").unwrap().into();
    let mut out_class_dir = out_dir.clone();
    out_class_dir.push("java");
    out_class_dir.push(slint_path);

    if out_class_dir.try_exists().unwrap_or(false) {
        let _ = std::fs::remove_dir_all(&out_class_dir);
    }
    std::fs::create_dir_all(&out_class_dir)
        .unwrap_or_else(|e| panic!("Cannot create output directory {out_class_dir:?} - {e}"));

    let android_jar = android_build::android_jar(None).expect("No Android platforms found");

    // Compile the Java file into .class files
    let o = JavaBuild::new()
        .file(&java_src_path)
        .class_path(&android_jar)
        .classes_out_dir(&out_class_dir)
        .java_source_version(8)
        .java_target_version(8)
        .debug_info(android_build::DebugInfo {
            line_numbers: !release_mode,
            variables: !release_mode,
            source_files: !release_mode,
        })
        .command()
        .unwrap_or_else(|e| panic!("Could not generate the java compiler command: {e}"))
        .args(["-encoding", "UTF-8"])
        .output()
        .unwrap_or_else(|e| panic!("Could not run the java compiler: {e}"));

View on GitHub (pinned to 3fd8f2ec03)

Solutions

1. Install an Android platform via the SDK manager (sdkmanager 'platforms;android-XX').
2. Set ANDROID_HOME/ANDROID_SDK_ROOT to the SDK location.

When it happens

Trigger: Thrown at internal/backends/android-activity/build.rs:34 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of slint-ui/slint@3fd8f2ec03 (2026-08-19). Data as JSON: /api/errors/81356de841b2beae. Report an issue: GitHub.