【重头学习Android】关于path与URI的转换

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我是靠谱客的博主娇气发箍，最近开发中收集的这篇文章主要介绍【重头学习Android】关于path与URI的转换，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

转自于：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2014/0821/1660.html

/**

* Try to return the absolute file path from the given Uri

*

* @param context

* @param uri

* @return the file path or null

*/

public static String getRealFilePath( final Context context, final Uri uri ) {

if
( 
null
 == uri ) 
return
null
;

final String scheme = uri.getScheme();

String data = 
null
;

if
( scheme == 
null
 )

data = uri.getPath();

else
if
( ContentResolver.SCHEME_FILE.equals( scheme ) ) {

data = uri.getPath();

} 
else
if
 ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {

Cursor cursor = context.getContentResolver().query( uri, 
new
String[] { ImageColumns.DATA }, 
null
, 
null
, 
null
);

if
( 
null
 != cursor ) {

if
( cursor.moveToFirst() ) {

int index = cursor.getColumnIndex( ImageColumns.DATA );

if
( index > -1 ) {

data = cursor.getString( index );

}

}

cursor.close();

}

}

return
data;

}

那么假如我们有一个图片的路径地址又该如何获得其Uri呢？

String type = Utils.ensureNotNull(intent.getType());

Log.d(TAG, 
"uri is "
+ uri);

if
 (uri.getScheme().equals(
"file"
) && (type.contains(
"image/"
))) {

String path = uri.getEncodedPath();

Log.d(TAG, 
"path1 is "
+ path);

if
(path != 
null
) {

path = Uri.decode(path);

Log.d(TAG, 
"path2 is "
+ path);

ContentResolver cr = 
this
.getContentResolver();

StringBuffer buff = 
new
StringBuffer();

buff.append(
"("
)

.append(Images.ImageColumns.DATA)

.append(
"="
)

.append(
"'"
+ path + 
"'"
)

.append(
")"
);

Cursor cur = cr.query(

Images.Media.EXTERNAL_CONTENT_URI,

new
String[] { Images.ImageColumns._ID },

buff.toString(), 
null
, 
null
);

int index = 0;

for
(cur.moveToFirst(); !cur.isAfterLast(); cur

.moveToNext()) {

index = cur.getColumnIndex(Images.ImageColumns._ID);

// set _id value

index = cur.getInt(index);

}

if
(index == 0) {

//do nothing

} 
else
{

Uri uri_temp = Uri

.parse(
"content://media/external/images/media/"

+ index);

Log.d(TAG, 
"uri_temp is "
+ uri_temp);

if
(uri_temp != 
null
) {

uri = uri_temp;

}

}

}

}