【Android】SharedMemory获取文件描述符

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于 2025-03-26 19:03:03 发布 · 1.2k 阅读

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SharedMemory用来实现共享内存操作很方便，也提供了获取文件描述符的方法，但是是hide的，普通app不能访问，

    /**
     * Returns the backing {@link FileDescriptor} for this SharedMemory object. The SharedMemory
     * instance retains ownership of the FileDescriptor.
     *
     * This FileDescriptor is interoperable with the ASharedMemory NDK APIs.
     *
     * @return Returns the FileDescriptor associated with this object.
     *
     * @hide Exists only for MemoryFile interop
     */
    public @NonNull FileDescriptor getFileDescriptor() {
        return mFileDescriptor;
    }

    /**
     * Returns the backing native fd int for this SharedMemory object. The SharedMemory
     * instance retains ownership of the fd.
     *
     * This fd is interoperable with the ASharedMemory NDK APIs.
     *
     * @return Returns the native fd associated with this object, or -1 if it is already closed.
     *
     * @hide Exposed for native ASharedMemory_dupFromJava()
     */
    @U