Android提供了多种方式来打开特定文件夹中的视频

使用 MediaStore获取指定文件夹的视频，更优化方法：

 
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.RequiresApi;
import android.webkit.MimeTypeMap;
 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
 
public class VideoUtils {
 
    public static final String VIDEO_DIR = "videoData";
 
    public static Uri saveVideoToExternalStorage(Context context, File videoFile) throws IOException {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
            // 分区存储模式下需要使用MediaStore API
            return insertVideoWithMediaStore(context, videoFile);
        } else {
            // 旧存储模型可以直接写入文件
            return writeVideoToExternalFilesDir(context, videoFile);
        }
    }
 
    @RequiresApi(api = Build.VERSION_CODES.O)
    private static Uri insertVideoWithMediaStore(Context context, File videoFile) {
        // 获取文件的MIME类型
        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(videoFile.getName().substring(videoFile.getName().lastIndexOf('.')));
        ContentValues values = new ContentValues();
        values.put(MediaStore.Video.Media.DISPLAY_NAME, videoFile.getName());
        values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4");
        values.put(MediaStore.Video.Media.RELATIVE_PATH, Environment.DIRECTORY_MOVIES + "/" + VIDEO_DIR);
 
        ContentResolver resolver = context.getContentResolver();
        Uri uri = resolver.insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, values);
 
        if (uri != null) {
            try (OutputStream outputStream = context.getContentResolver().openOutputStream(uri)) {
                Files.copy(videoFile.toPath(), outputStream);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return uri;
    }
 
 
    public static Uri saveVideoToExternalStorage2(Context context, File videoFile) throws IOException {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
            // 分区存储模式下需要使用MediaStore API
            return insertVideoWithMediaStore(context, videoFile);
        } else {
            // 旧存储模型可以直接写入文件
            return writeVideoToExternalFilesDir(context, videoFile);
        }
    }
 
    /**
     * 将视频文件保存到应用的专属外部存储目录。
     *
     * @param context   应用的 Context
     * @param videoFile 要保存的视频文件
     * @return 保存视频文件的 Uri
     * @throws IOException 如果文件写入过程中发生错误
     */
    public static Uri writeVideoToExternalFilesDir(Context context, File videoFile) throws IOException {
        // Get the external files directory for the app
        File externalFilesDir = context.getExternalFilesDir(null);
        if (externalFilesDir != null) {
            // Create a unique name for the video file in the external directory
            File outputFile = new File(externalFilesDir, getFileName(videoFile.getAbsolutePath())); // Use a meaningful file name
 
            // Ensure the parent directory exists
            outputFile.getParentFile().mkdirs();
 
            // Open a buffered input stream from the source file and a buffered output stream to the destination file
            try (FileInputStream inputStream = new FileInputStream(videoFile);
                 BufferedInputStream bufferedInput = new BufferedInputStream(inputStream);
                 FileOutputStream outputStream = new FileOutputStream(outputFile);
                 BufferedOutputStream bufferedOutput = new BufferedOutputStream(outputStream)) {
 
                byte[] buffer = new byte[4096];
                int bytesRead;
                while ((bytesRead = bufferedInput.read(buffer)) != -1) {
                    bufferedOutput.write(buffer, 0, bytesRead);
                }
            }
            return Uri.fromFile(outputFile);
        }
        return null;
    }
 
}