我有一个文件的真实路径,如“file：///mnt/sdcard/3dphoto/temp19.jps”
,我怎么能得到像“content：// media / external / images / media / 1”这样的uri？
,我怎么能得到像“content：// media / external / images / media / 1”这样的uri？
解决方法
在文件路径中转换“file：// …”,使用以下代码查找项目的ID,然后将其附加到提供者URI.此外,基于文件扩展名,使用正确的提供程序(例如MediaStore.Video.Media.EXTERNAL_CONTENT_URI或MediaStore.
Image.Media.EXTERNAL_CONTENT_URI)
/**
* Given a media filename,returns it's id in the media content provider
*
* @param providerUri
* @param appContext
* @param fileName
* @return
*/
public long getMediaItemIdFromProvider(Uri providerUri,Context appContext,String fileName) {
//find id of the media provider item based on filename
String[] projection = { MediaColumns._ID,MediaColumns.DATA };
Cursor cursor = appContext.getContentResolver().query(
providerUri,projection,MediaColumns.DATA + "=?",new String[] { fileName },null);
if (null == cursor) {
Log.d(TAG_LOG,"Null cursor for file " + fileName);
return ITEMID_NOT_FOUND;
}
long id = ITEMID_NOT_FOUND;
if (cursor.getCount() > 0) {
cursor.moveToFirst();
id = cursor.getLong(cursor.getColumnIndexOrThrow(BaseColumns._ID));
}
cursor.close();
return id;
}
有时,在将一个媒体文件添加到设备的存储中后,MediaProvider不会立即刷新.您可以使用此方法强制刷新其记录：
/**
* Force a refresh of media content provider for specific item
*
* @param fileName
*/
private void refreshMediaProvider(Context appContext,String fileName) {
MediaScannerConnection scanner = null;
try {
scanner = new MediaScannerConnection(appContext,null);
scanner.connect();
try {
Thread.sleep(200);
} catch (Exception e) {
}
if (scanner.isConnected()) {
Log.d(TAG_LOG,"Requesting scan for file " + fileName);
scanner.scanFile(fileName,null);
}
} catch (Exception e) {
Log.e(TAG_LOG,"Cannot to scan file",e);
} finally {
if (scanner != null) {
scanner.disconnect();
}
}
}
