如何从URI获取完整的文件路径

Question

我想从URI中获得完整的文件路径。URI不是图像，而是音乐文件，但如果我像纵隔解决方案那样做，如果应用程序用户选择eg Astro作为浏览器，而不是音乐播放器，它就不会工作。我怎么解决这个？

Answer 1

PathUtil方法只能在oreo下面工作，如果是oreo，它很可能崩溃，因为在oreo中，我们不会获得id，而是在data.getdata（）中获得整个路径，所以你所需要做的就是从uri创建一个文件，从getPath（）获得它的路径，然后拆分它。下面是工作代码：-

Uri uri = data.getData(); 
File file = new File(uri.getPath());//create path from uri
final String[] split = file.getPath().split(":");//split the path.
filePath = split[1];//assign it to a string(your choice).

上面的代码将工作在奥利奥，如果它是低于奥利奥比PathUtil将工作。谢谢！

String filePath=PathUtil.getPath(context,yourURI);

pathutil.java

import android.annotation.SuppressLint; 
import android.content.ContentUris; 
import android.content.Context; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.Build; 
import android.os.Environment; 
import android.provider.DocumentsContract;
import android.provider.MediaStore;

import java.net.URISyntaxException;

/**
 * Created by Aki on 1/7/2017.
 */

public class PathUtil {
    /*
     * Gets the file path of the given Uri.
     */
    @SuppressLint("NewApi")
    public static String getPath(Context context, Uri uri) throws URISyntaxException {
        final boolean needToCheckUri = Build.VERSION.SDK_INT >= 19;
        String selection = null;
        String[] selectionArgs = null;
        // Uri is different in versions after KITKAT (Android 4.4), we need to
        // deal with different Uris.
        if (needToCheckUri && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) {
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            } else if (isDownloadsDocument(uri)) {
                final String id = DocumentsContract.getDocumentId(uri);
                uri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
            } else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                if ("image".equals(type)) {
                    uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }
                selection = "_id=?";
                selectionArgs = new String[]{ split[1] };
            }
        }
        if ("content".equalsIgnoreCase(uri.getScheme())) {
            String[] projection = { MediaStore.Images.Media.DATA };
            Cursor cursor = null;
            try {
                cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                if (cursor.moveToFirst()) {
                    return cursor.getString(column_index);
                }
            } catch (Exception e) {
            }
        } else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }
        return null;
    }


    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
}