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ndk/asset: Add from_java method to create AssetManager from Java Asse… #516

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18 changes: 18 additions & 0 deletions ndk/src/asset.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@ use std::{
ptr::NonNull,
};

use jni_sys::{jobject, JNIEnv};

/// A native [`AAssetManager *`]
///
/// [`AAssetManager *`]: https://developer.android.com/ndk/reference/group/asset#aassetmanager
Expand All @@ -35,6 +37,22 @@ impl AssetManager {
Self { ptr }
}

/// Create an [`AssetManager`] from a Java [`android.content.res.AssetManager`] object.
///
/// The Java object must be kept alive for the lifetime of the returned [`AssetManager`].
///
/// # Safety
/// `env` must be a valid [`JNIEnv`] pointer for the current thread, and `asset_manager` must
/// be a valid reference to a Java `android.content.res.AssetManager` that has not been
/// garbage collected.
///
/// [`android.content.res.AssetManager`]: https://developer.android.com/reference/android/content/res/AssetManager
#[doc(alias = "AAssetManager_fromJava")]
pub unsafe fn from_java(env: *mut JNIEnv, asset_manager: jobject) -> Option<Self> {
let ptr = unsafe { ffi::AAssetManager_fromJava(env, asset_manager) };
Some(Self::from_ptr(NonNull::new(ptr)?))
}

/// Returns the pointer to the native `AAssetManager`.
pub fn ptr(&self) -> NonNull<ffi::AAssetManager> {
self.ptr
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