如何在Android API 29中获取缩略图 [英] How to get Thumbnail in Android API 29

问题描述

尝试从视频中获取缩略图.在API 29之前，这是使用MediaStore.Images.Thumbnails进行管理的.代码示例

Trying to get thumbnails from a video. Prior to API 29, this was managed using MediaStore.Images.Thumbnails. Code example

Bitmap bitmapThumbnail = ThumbnailUtils.createVideoThumbnail(videoArrayList.get(position).getPath(), MediaStore.Images.Thumbnails.MINI_KIND);

但是在API 29中，MediaStore.Images.Thumbnails被声明为已弃用.Google提供了ContentResolver#loadThumbnail.告诉我如何使用它.

But in API 29 MediaStore.Images.Thumbnails is declared deprecated. Google offers ContentResolver # loadThumbnail. Tell me how to use it.

推荐答案

createVideoThumbnail 从以下位置更改:

公共静态位图createVideoThumbnail(字符串filePath，int类型)

public static Bitmap createVideoThumbnail (String filePath, int kind)

到

公共静态位图createVideoThumbnail(文件文件，大小大小，CancellationSignal信号)

public static Bitmap createVideoThumbnail (File file, Size size, CancellationSignal signal)

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因此，您在问题中提供的示例将更改为以下内容:

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So, the example you have provided in your question, will change to the following:

Size mSize = new Size(96,96);
CancellationSignal ca = new CancellationSignal();
Bitmap bitmapThumbnail = ThumbnailUtils.createVideoThumbnail(new File(videoArrayList.get(position).getPath()), mSize, ca);

您可以使用 CancellationSignal 通过调用 ca.cancel(); 取消创建 Bitmap .

You can use CancellationSignal to cancel the creation of the Bitmap by calling ca.cancel();.

Size 的值取决于所需的 Bitmap 的大小:

The Size value depends on the size of Bitmap you want:

大小:屏幕上将显示此缩略图的目标区域.这将以EXTRA_SIZE的形式传递给提供程序，以帮助其避免下载或生成大量资源.此值不能为空.

Size: The target area on the screen where this thumbnail will be shown. This is passed to the provider as EXTRA_SIZE to help it avoid downloading or generating heavy resources. This value cannot be null.

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您还可以使用 loadThumbnail ，它接受 Uri 而不是 File 对象，例如:

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You can also use loadThumbnail, which accepts a Uri instead of a File object, like this:

公共位图loadThumbnail(Uri uri，大小大小，CancellationSignal信号)

public Bitmap loadThumbnail (Uri uri, Size size, CancellationSignal signal)

因此您的代码将如下所示:

So your code will then look like this:

Uri mUri = ...; // Your Uri
Size mSize = new Size(96,96);
CancellationSignal ca = new CancellationSignal();
Bitmap bitmapThumbnail = getContentResolver().loadThumbnail(mUri, mSize, ca);

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