感谢StackOverflow提供的代码：
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 android.provider.OpenableColumns;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
/**
* Created by Aki on 1/7/2017.
*/
public class FileUtil {
private static Uri contentUri = null;
/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.<br>
* <br>
* Callers should check whether the path is local before assuming it
* represents a local file.
*
* @param context The context.
* @param uri The Uri to query.
*/
@SuppressLint("NewApi")
public static String getPath(final Context context, final Uri uri) {
// check here to KITKAT or new version
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
String selection = null;
String[] selectionArgs = null;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
String fullPath = getPathFromExtSD(split);
if (fullPath != "") {
return fullPath;
} else {
return null;
}
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
final String id;
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, new String[]{MediaStore.MediaColumns.DISPLAY_NAME}, null, null, null);
if (cursor != null && cursor.moveToFirst()) {
String fileName = cursor.getString(0);
String path = Environment.getExternalStorageDirectory().toString() + "/Download/" + fileName;
if (!TextUtils.isEmpty(path)) {
return path;
}
}
} finally {
if (cursor != null)
cursor.close();
}
id = DocumentsContract.getDocumentId(uri);
if (!TextUtils.isEmpty(id)) {
if (id.startsWith("raw:")) {
return id.replaceFirst("raw:", "");
}
String[] contentUriPrefixesToTry = new String[]{
"content://downloads/public_downloads",
"content://downloads/my_downloads"
};
for (String contentUriPrefix : contentUriPrefixesToTry) {
try {
final Uri contentUri = ContentUris.withAppendedId(Uri.parse(contentUriPrefix), Long.valueOf(id));
/* final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));*/
return getDataColumn(context, contentUri, null, null);
} catch (NumberFormatException e) {
//In Android 8 and Android P the id is not a number
return uri.getPath().replaceFirst("^/document/raw:", "").replaceFirst("^raw:", "");
}
}
}
} else {
final String id = DocumentsContract.getDocumentId(uri);
final boolean isOreo = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
if (id.startsWith("raw:")) {
return id.replaceFirst("raw:", "");
}
try {
contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
} catch (NumberFormatException e) {
e.printStackTrace();
}
if (contentUri != null) {
return getDataColumn(context, contentUri, null, null);
}
}
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
selection = "_id=?";
selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection,
selectionArgs);
} else if (isGoogleDriveUri(uri)) {
return getDriveFilePath(uri, context);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
if (isGooglePhotosUri(uri)) {
return uri.getLastPathSegment();
}
if (isGoogleDriveUri(uri)) {
return getDriveFilePath(uri, context);
}
if( Build.VERSION.SDK_INT == Build.VERSION_CODES.N)
{
// return getFilePathFromURI(context,uri);
return getMediaFilePathForN(uri, context);
// return getRealPathFromURI(context,uri);
}else
{
return getDataColumn(context, uri, null, null);
}
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Check if a file exists on device
*
* @param filePath The absolute file path
*/
private static boolean fileExists(String filePath) {
File file = new File(filePath);
return file.exists();
}
/**
* Get full file path from external storage
*
* @param pathData The storage type and the relative path
*/
private static String getPathFromExtSD(String[] pathData) {
final String type = pathData[0];
final String relativePath = "/" + pathData[1];
String fullPath = "";
// on my Sony devices (4.4.4 & 5.1.1), `type` is a dynamic string
// something like "71F8-2C0A", some kind of unique id per storage
// don't know any API that can get the root path of that storage based on its id.
//
// so no "primary" type, but let the check here for other devices
if ("primary".equalsIgnoreCase(type)) {
fullPath = Environment.getExternalStorageDirectory() + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}
}
// Environment.isExternalStorageRemovable() is `true` for external and internal storage
// so we cannot relay on it.
//
// instead, for each possible path, check if file exists
// we'll start with secondary storage as this could be our (physically) removable sd card
fullPath = System.getenv("SECONDARY_STORAGE") + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}
fullPath = System.getenv("EXTERNAL_STORAGE") + relativePath;
if (fileExists(fullPath)) {
return fullPath;
}
return fullPath;
}
private static String getDriveFilePath(Uri uri, Context context) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
/*
* Get the column indexes of the data in the Cursor,
* * move to the first row in the Cursor, get the data,
* * and display it.
* */
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getCacheDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();
//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size", "Size " + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path", "Path " + file.getPath());
Log.e("File Size", "Size " + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}
private static String getMediaFilePathForN(Uri uri, Context context) {
Uri returnUri = uri;
Cursor returnCursor = context.getContentResolver().query(returnUri, null, null, null, null);
/*
* Get the column indexes of the data in the Cursor,
* * move to the first row in the Cursor, get the data,
* * and display it.
* */
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
String name = (returnCursor.getString(nameIndex));
String size = (Long.toString(returnCursor.getLong(sizeIndex)));
File file = new File(context.getFilesDir(), name);
try {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
FileOutputStream outputStream = new FileOutputStream(file);
int read = 0;
int maxBufferSize = 1 * 1024 * 1024;
int bytesAvailable = inputStream.available();
//int bufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
final byte[] buffers = new byte[bufferSize];
while ((read = inputStream.read(buffers)) != -1) {
outputStream.write(buffers, 0, read);
}
Log.e("File Size", "Size " + file.length());
inputStream.close();
outputStream.close();
Log.e("File Path", "Path " + file.getPath());
Log.e("File Size", "Size " + file.length());
} catch (Exception e) {
Log.e("Exception", e.getMessage());
}
return file.getPath();
}
private static String getDataColumn(Context context, Uri uri,
String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection,
selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is ExternalStorageProvider.
*/
private 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.
*/
private 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.
*/
private static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri - The Uri to check.
* @return - Whether the Uri authority is Google Photos.
*/
private static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Drive.
*/
private static boolean isGoogleDriveUri(Uri uri) {
return "com.google.android.apps.docs.storage".equals(uri.getAuthority()) || "com.google.android.apps.docs.storage.legacy".equals(uri.getAuthority());
}
}
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