Struct AndroidContext

pub struct AndroidContext { /* private fields */ }

AndroidContext provides the pointers required to interface with the jni on Android platforms.

Implementations

impl AndroidContext

pub fn vm(self) -> *mut c_void

A handle to the JavaVM object.

Usage with jni crate:

let ctx = ndk_context::android_context();
let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }?;
let env = vm.attach_current_thread();

pub fn context(self) -> *mut c_void

A handle to an android.content.Context. In most cases this will be a ptr to an Activity, but this isn’t guaranteed.

Usage with jni crate:

let ctx = ndk_context::android_context();
let vm = unsafe { jni::JavaVM::from_raw(ctx.vm().cast()) }?;
let env = vm.attach_current_thread();
let class_ctx = env.find_class("android/content/Context")?;
let audio_service = env.get_static_field(class_ctx, "AUDIO_SERVICE", "Ljava/lang/String;")?;
let audio_manager = env
    .call_method(
        ctx.context() as jni::sys::jobject,
        "getSystemService",
        "(Ljava/lang/String;)Ljava/lang/Object;",
        &[audio_service],
    )?
    .l()?;

Trait Implementations

impl Clone for AndroidContext

fn clone(&self) -> AndroidContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AndroidContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for AndroidContext