MediaStore.OpenAssetFileDescriptor Method

Reference

Definition

Namespace:: Android.Provider

Assembly:: Mono.Android.dll

Important

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Works exactly the same as ContentResolver#openAssetFileDescriptor(Uri, String, CancellationSignal), but only works for Uri whose scheme is ContentResolver#SCHEME_CONTENT and its authority is MediaStore#AUTHORITY.

[Android.Runtime.Register("openAssetFileDescriptor", "(Landroid/content/ContentResolver;Landroid/net/Uri;Ljava/lang/String;Landroid/os/CancellationSignal;)Landroid/content/res/AssetFileDescriptor;", "", ApiSince=36)]
public static Android.Content.Res.AssetFileDescriptor? OpenAssetFileDescriptor(Android.Content.ContentResolver resolver, Android.Net.Uri uri, string mode, Android.OS.CancellationSignal? cancellationSignal);

[<Android.Runtime.Register("openAssetFileDescriptor", "(Landroid/content/ContentResolver;Landroid/net/Uri;Ljava/lang/String;Landroid/os/CancellationSignal;)Landroid/content/res/AssetFileDescriptor;", "", ApiSince=36)>]
static member OpenAssetFileDescriptor : Android.Content.ContentResolver * Android.Net.Uri * string * Android.OS.CancellationSignal -> Android.Content.Res.AssetFileDescriptor

Parameters

resolver: ContentResolver

The ContentResolver used to connect with MediaStore#AUTHORITY. Typically this value is gotten from Context#getContentResolver()

uri: Uri

The desired URI to open.

mode: String

The string representation of the file mode. Can be "r", "w", "wt", "wa", "rw" or "rwt". Please note the exact implementation of these may differ for each Provider implementation - for example, "w" may or may not truncate.

cancellationSignal: CancellationSignal

Returns

AssetFileDescriptor

a new ParcelFileDescriptor pointing to the file or null if the provider recently crashed. You own this descriptor and are responsible for closing it when done.

Attributes: RegisterAttribute

Remarks

This API is preferred over ContentResolver#openAssetFileDescriptor(Uri, String, CancellationSignal) when opening media Uri for ensuring system stability especially when opening URIs returned as a result of using MediaStore#ACTION_PICK_IMAGES

Java documentation for android.provider.MediaStore.openAssetFileDescriptor(android.content.ContentResolver, android.net.Uri, java.lang.String, android.os.CancellationSignal).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Applies to

通过