原文地址： http://write.blog.csdn.net/postedit
直接上代码，注释已经很清楚
/**
* 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.
*
*
@param
context The context.
*
@param
uri The
Uri
to query.
*
@author
paulburke
*/
@SuppressLint
(
“NewApi”
)
public
static
String getPath(
final
Context context,
final
Uri uri) {
final
boolean
isKitKat = Build.VERSION.
SDK_INT
>= Build.VERSION_CODES.
KITKAT
;
// 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];
if
(
“primary”
.equalsIgnoreCase(type)) {
return
Environment.
getExternalStorageDirectory
() +
“/”
+ split[1];
}
//
TODO
handle non-primary volumes
}
// DownloadsProvider
else
if
(
isDownloadsDocument
(uri)) {
final
String id = DocumentsContract.
getDocumentId
( uri);
final
Uri contentUri = ContentUris.
withAppendedId
(
Uri.
parse
(
“content://downloads/public_downloads”
), Long.
valueOf
(id));
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
;
}
final
String selection =
“_id=?”
;
final
String[] selectionArgs =
new
String[] {
split[1]
};
return
getDataColumn
(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else
if
(
“content”
.equalsIgnoreCase(uri .getScheme())) {
return
getDataColumn
(context, uri,
null
,
null
);
}
// File
else
if
(
“file”
.equalsIgnoreCase(uri .getScheme())) {
return
uri.getPath();
}
return
null
;
}
/**
* Get the value of the data column for this
Uri
. This is useful for
* MediaStore
Uris
, and other file
–
based ContentProviders.
*
*
@param
context The context.
*
@param
uri The
Uri
to query.
*
@param
selection (Optional) Filter used in the query.
*
@param
selectionArgs (Optional) Selection arguments used in the query.
*
@return
The value of the _data column, which is typically a file path.
*/
public
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
column_index = cursor.getColumnIndexOrThrow(column);
return
cursor.getString(column_index);
}
}
finally
{
if
(cursor !=
null
)
cursor.close();
}
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());
}
————–
spring mvc+tomcat源码分析视频 （复制链接在浏览器打开）