### Rust: Android Activity Management and UI Setup with droid-wrap

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Illustrates how to manage Android activities and set up UI components using droid-wrap. This snippet covers creating `TextView` and `EditText`, arranging them in a `LinearLayout`, and adding them to the activity's content view via `WindowManager`. It also includes an example of requesting runtime permissions.

```rust
use droid_wrap::{
    Result,
    android::{
        app::Activity,
        widget::{EditText, TextView, LinearLayout, LinearLayout_LayoutParams},
        view::{ViewGroup_LayoutParams, ViewManager, WindowManager_LayoutParams, WindowManagerImpl},
    },
    java::lang::{CharSequenceExt, CharSequenceImpl, RunnableImpl},
};
use std::sync::Arc;

fn setup_ui() -> Result<()> {
    let activity = Arc::new(Activity::fetch()?);

    // Create UI components
    let text_view = TextView::new(activity.as_ref());
    text_view.set_text(
        "Hello from Rust!".to_char_sequence::<CharSequenceImpl>().ok()
    );

    let edit_text = EditText::new(activity.as_ref());

    // Set up layout on UI thread
    let activity_clone = activity.clone();
    let runnable = RunnableImpl::from_fn(move || {
        let layout = LinearLayout::new(activity_clone.as_ref());
        layout.set_orientation(LinearLayout::VERTICAL);

        let params = LinearLayout_LayoutParams::new_with_weight(
            ViewGroup_LayoutParams::MATCH_PARENT,
            ViewGroup_LayoutParams::MATCH_PARENT,
            1.0,
        );
        layout.set_layout_params(&params);

        activity_clone.set_content_view(&layout);

        // Add views through WindowManager
        let wm: WindowManagerImpl = activity_clone.get_window_manager();
        let wm_params = WindowManager_LayoutParams::new();
        let _ = wm.add_view(&text_view, &wm_params);
        let _ = wm.add_view(&edit_text, &wm_params);

        Ok(())
    })?;

    activity.run_on_ui_thread(runnable.as_ref());

    // Permission handling
    let permissions = vec![
        "android.permission.CAMERA".to_string(),
        "android.permission.RECORD_AUDIO".to_string(),
    ];
    if activity.should_show_request_permission_rationale(permissions[0].clone()) {
        println!("Should show rationale");
    }
    activity.request_permissions(&permissions, 100)?;

    Ok(())
}
```

--------------------------------

### Android Build and Deployment with cargo-apk2

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Sets up environment variables and uses cargo-apk2 for building and deploying Android applications. It covers installing cargo-apk2, running examples, testing, and building release APKs.

```bash
# Environment variables (set in .bashrc or .zshrc)
export ANDROID_HOME="/path/to/Android/Sdk"
export ANDROID_BUILD_TOOLS_VERSION="35.0.0"
export ANDROID_API_LEVEL=35
export JAVA_HOME="/path/to/jre"

# Install cargo-apk2 packaging tool
cargo install cargo-apk2

# Build and run examples
cargo apk2 run -p droid-wrap-example --example activity-example
cargo apk2 run -p droid-wrap-example --example java-example

# Run comprehensive tests on device/emulator
cargo apk2 run -p droid-wrap-test --all-features

# Build release APK
cargo apk2 build --release

```

--------------------------------

### Implement Java Interfaces with Rust Closures

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Illustrates how to implement Java interfaces in Rust using dynamic proxies and closures provided by the `droid-wrap` library. This enables handling callbacks and listener patterns for Android UI components like TextView. Examples include Runnable, OnClickListener, OnKeyListener, TextWatcher, and OnEditorActionListener. Requires the `droid-wrap` crate.

```rust
use droid_wrap::{
    Result,
    android::{
        app::Activity,
        widget::{TextView, TextView_OnEditorActionListenerImpl},
        view::{View_OnClickListenerImpl, View_OnKeyListenerImpl},
        text::TextWatcherImpl,
    },
    java::lang::RunnableImpl,
};

fn implement_java_interfaces() -> Result<()> {
    let activity = Activity::fetch()?;
    let text_view = TextView::new(&activity);

    // Runnable interface implementation
    let runnable = RunnableImpl::from_fn(|| {
        println!("Runnable executed");
        Ok(())
    })?;
    activity.run_on_ui_thread(runnable.as_ref());

    // OnClickListener implementation
    let click_listener = View_OnClickListenerImpl::from_fn(|view| {
        println!("Clicked view ID: {}", view.get_id());
        Ok(())
    })?;
    text_view.set_on_click_listener(click_listener.as_ref());

    // OnKeyListener implementation
    let key_listener = View_OnKeyListenerImpl::from_fn(|view, key_code, event| {
        println!("Key event: code={}", key_code);
        Ok(true) // Return true if handled
    })?;
    text_view.set_on_key_listener(key_listener.as_ref());

    // TextWatcher implementation
    let text_watcher = TextWatcherImpl::from_fns(
        |char_seq, start, count, after| {
            println!("Before text changed");
            Ok(())
        },
        |char_seq, start, before, count| {
            println!("Text changing");
            Ok(())
        },
        |editable| {
            println!("After text changed");
            Ok(())
        },
    )?;
    text_view.add_text_changed_listener(text_watcher.as_ref());

    // OnEditorActionListener implementation
    let editor_listener = TextView_OnEditorActionListenerImpl::from_fn(
        |view, action_id, key_event| {
            match action_id {
                6 => println!("Done action"), // IME_ACTION_DONE
                5 => println!("Next action"), // IME_ACTION_NEXT
                _ => println!("Other action: {}", action_id),
            }
            Ok(false)
        }
    )?;
    text_view.set_on_editor_action_listener(editor_listener.as_ref());

    // Note: Proxy objects must be explicitly released when no longer needed
    // since Rust cannot determine when Java no longer needs the reference
    // runnable.release();
    // click_listener.release();

    Ok(())
}
```

--------------------------------

### Rust: Android Main Entry Point with droid-wrap

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Demonstrates the basic structure of an Android application entry point using the `#[android_main]` macro from the droid-wrap library. It shows how to fetch the current activity, set its title, and perform basic lifecycle checks.

```rust
use droid_wrap::{
    Result,
    android::app::Activity,
    java::lang::{CharSequenceExt, CharSequenceImpl},
    android_main,
};

#[android_main]
fn main() -> Result<()> {
    // Fetch the current activity instance
    let activity = Activity::fetch()?;

    // Set the activity title
    let title = "My Android App".to_char_sequence::<CharSequenceImpl>()?;
    activity.set_title(&title);

    // Check if activity is finishing
    if !activity.is_finishing() {
        println!("Activity is running");
    }

    activity.finish();
    Ok(())
}
```

--------------------------------

### Access Android System Services with Rust

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Demonstrates how to access and utilize Android system services such as Vibrator and TextToSpeech from Rust code. It shows how to obtain service instances, check device capabilities, create vibration effects, and initialize/use the TextToSpeech engine. Requires the `droid-wrap` crate and Android context.

```rust
use droid_wrap::{
    Result,
    android::{
        app::Activity,
        content::Context,
        os::{Vibrator, VibratorManager, VibrationEffect},
        speech::tts::{TextToSpeech, TextToSpeech_OnInitListenerImpl},
    },
    java::lang::CharSequenceExt,
};

fn access_system_services() -> Result<()> {
    let activity = Activity::fetch()?;

    // Vibrator service
    let vibrator: Vibrator = activity.get_system_service(Context::VIBRATOR_SERVICE)?;
    if vibrator.has_vibrator() {
        println!("Device has vibrator");
        println!("Amplitude control: {}", vibrator.has_amplitude_control());
        println!("Frequency control: {}", vibrator.has_frequency_control());

        // Create vibration effect
        let effect = VibrationEffect::create_one_shot(500, 255)?;
        if vibrator.are_vibration_features_supported(&effect) {
            vibrator.vibrate(&effect);
        }
    }

    // VibratorManager for multi-vibrator devices
    let vibrator_manager: VibratorManager = 
        activity.get_system_service(Context::VIBRATOR_MANAGER_SERVICE)?;
    let default_vibrator = vibrator_manager.get_default_vibrator();
    let vibrator_id_0 = vibrator_manager.get_vibrator(0);

    // Text-to-Speech service
    let tts_listener = TextToSpeech_OnInitListenerImpl::from_fn(|status| {
        if status == TextToSpeech::SUCCESS {
            println!("TTS initialized successfully");
        } else {
            println!("TTS initialization failed: {}", status);
        }
        Ok(())
    })?;

    let tts = TextToSpeech::new(&activity, tts_listener.as_ref());
    let text = "Hello from Rust".to_char_sequence::<CharSequenceImpl>()?;
    tts.speak(&text, TextToSpeech::QUEUE_FLUSH, None, None)?;

    // Remember to shutdown TTS when done
    tts.shutdown();

    Ok(())
}
```

--------------------------------

### Configure TextView and EditText Widgets in Rust

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

This snippet demonstrates how to configure TextView and EditText widgets using the droid-wrap library. It covers setting text, hints, handling editor actions, text selection, and input type configuration. Dependencies include droid_wrap and its Android and Java modules.

```rust
use droid_wrap::{
    Result,
    android::{
        app::Activity,
        widget::{TextView, EditText, TextView_OnEditorActionListenerImpl},
        view::View,
    },
    java::lang::{CharSequenceExt, CharSequenceImpl},
};

fn setup_text_widgets() -> Result<()> {
    let activity = Activity::fetch()?;

    // TextView configuration
    let text_view = TextView::new(&activity);
    text_view.set_text(
        "Welcome Message".to_char_sequence::<CharSequenceImpl>().ok()
    );
    text_view.set_hint(
        "Hint text".to_char_sequence::<CharSequenceImpl>().ok()
    );

    // Get current text
    let current_text: Option<CharSequenceImpl> = text_view.get_text();

    // EditText with editor action listener
    let edit_text = EditText::new(&activity);
    let editor_listener = TextView_OnEditorActionListenerImpl::from_fn(
        |view, action_id, event| {
            println!("Editor action triggered: {}", action_id);
            true // Return true if handled
        }
    )?;
    edit_text.set_on_editor_action_listener(editor_listener.as_ref());

    // Text selection
    edit_text.select_all();
    edit_text.set_selection(0, 5)?;

    // Input type configuration
    edit_text.set_input_type(0x00000001); // TYPE_CLASS_TEXT
    let input_type = edit_text.get_input_type();

    Ok(())
}

```

--------------------------------

### Configure View Interactions and Layout in Rust

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

This snippet shows how to configure general View interactions, including click listeners, positioning, visibility, focus management, and finding views by ID. It utilizes droid-wrap's Rust bindings for Android View components and event handling. Dependencies include droid_wrap and its Android and Java modules.

```rust
use droid_wrap::{
    Result,
    android::{
        app::Activity,
        view::{View, View_OnClickListenerImpl, View_OnLongClickListenerImpl},
    },
    java::lang::{CharSequenceExt, CharSequenceImpl, RunnableImpl},
};

fn configure_view_interactions() -> Result<()> {
    let activity = Activity::fetch()?;
    let view = View::new(&activity);

    // Click listener with Rust closure
    let click_listener = View_OnClickListenerImpl::from_fn(|clicked_view| {
        println!("View clicked!");
        clicked_view.announce_for_accessibility(
            &"Button pressed".to_char_sequence::<CharSequenceImpl>().unwrap()
        );
        Ok(())
    })?;
    view.set_on_click_listener(click_listener.as_ref());

    // Position and dimensions
    view.set_x(100.0);
    view.set_y(200.0);
    let width = view.get_width();
    let height = view.get_height();
    println!("View size: {}x{}", width, height);

    // Visibility control
    view.set_activated(true);
    assert!(view.is_activated());

    // Focus management
    if view.request_focus() {
        println!("Focus acquired");
    }
    view.clear_focus();

    // Find views by ID
    view.set_id(12345);
    if let Some(found) = view.find_view_by_id(12345) {
        println!("Found view with ID");
    }

    // Content description for accessibility
    view.set_content_description(
        Some("Descriptive text".to_char_sequence::<CharSequenceImpl>()?)
    );

    // Delayed execution
    let delayed_task = RunnableImpl::from_fn(|| {
        println!("Delayed task executed");
        Ok(())
    })?;
    view.post_delayed(delayed_task.as_ref(), 1000); // 1 second delay

    Ok(())
}

```

--------------------------------

### Cargo.toml Feature Configuration for droid-wrap

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

Configures Cargo.toml to selectively compile droid-wrap APIs based on enabled features. This helps minimize binary size by including only necessary components like Android app, widgets, views, and core Java types.

```toml
[dependencies]
droid-wrap = { version = "0.4.0", features = [
    "android_app",        # Activity and application components
    "android_widget",     # UI widgets (TextView, EditText, Button, etc.)
    "android_view",       # View system and input handling
    "android_content",    # Context, Intent, and content providers
    "android_os",         # OS services (Vibrator, Bundle, etc.)
    "android_speech_tts", # Text-to-speech functionality
    "java_lang",          # Core Java types (String, Integer, Runnable, etc.)
    "java_io",            # File I/O operations
] }

```

--------------------------------

### Perform Java Type Conversions in Rust

Source: https://context7.com/mzdk100/droid-wrap/llms.txt

This snippet illustrates seamless conversion between Rust and Java types using droid-wrap's CharSequence extension trait and Java wrapper types. It covers String to CharSequence conversion, Integer, Float, and Boolean wrappers, system utilities, and object hash code retrieval. Dependencies include droid_wrap and its Java lang module.

```rust
use droid_wrap::{
    Result,
    java::lang::{
        CharSequenceExt, CharSequenceImpl, Integer, Float, Boolean, System, Object, ObjectExt,
    },
};

fn java_type_examples() -> Result<()> {
    // String to CharSequence conversion
    let char_seq = "Hello, Android!".to_char_sequence::<CharSequenceImpl>()?;
    println!("CharSequence created");

    // Integer wrapper
    let int_value = Integer::value_of(42)?;
    println!("Integer value: {}", int_value.to_string());

    // Float wrapper
    let float_value = Float::value_of(3.14f32)?;
    println!("Float value: {}", float_value.to_string());

    // Boolean wrapper
    let bool_value = Boolean::value_of(true)?;

    // System utilities
    let current_time = System::current_time_millis();
    println!("Current timestamp: {}", current_time);

    System::gc(); // Trigger garbage collection

    // Object hash code
    let obj = Object::_new(&int_value.java_ref()?, Default::default())?;
    let hash = obj.hash_code();
    println!("Object hash: {}", hash);

    // Type casting
    let casted: Integer = obj.cast()?;

    Ok(())
}

```

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