Android Uri和文件路径互相转换的实例代码
在项目中需要用到将Uri转换为绝对路径，在网上找到一个方法，做个笔记
网上有不少方法，但是有的对4.4后的版本无效，这里的方法可以在4.4之后的版本将Uri转换为绝对路径
publicclassGetPathFromUri{
/**
*专为Android4.4设计的从Uri获取文件绝对路径
*/
publicstaticStringgetPath(finalContextcontext,finalUriuri){
finalbooleanisKitKat=Build.VERSION.SDK_INT>=Build.VERSION_CODES.KITKAT;
//DocumentProvider
if(isKitKat&&DocumentsContract.isDocumentUri(context,uri)){
//ExternalStorageProvider
if(isExternalStorageDocument(uri)){
finalStringdocId=DocumentsContract.getDocumentId(uri);
finalString[]split=docId.split(":");
finalStringtype=split[0];
if("primary".equalsIgnoreCase(type)){
returnEnvironment.getExternalStorageDirectory()+"/"+split[1];
}
}
//DownloadsProvider
elseif(isDownloadsDocument(uri)){
finalStringid=DocumentsContract.getDocumentId(uri);
finalUricontentUri=ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),Long.valueOf(id));
returngetDataColumn(context,contentUri,null,null);
}
//MediaProvider
elseif(isMediaDocument(uri)){
finalStringdocId=DocumentsContract.getDocumentId(uri);
finalString[]split=docId.split(":");
finalStringtype=split[0];
UricontentUri=null;
if("image".equals(type)){
contentUri=MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}elseif("video".equals(type)){
contentUri=MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
}elseif("audio".equals(type)){
contentUri=MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
finalStringselection="_id=?";
finalString[]selectionArgs=newString[]{split[1]};
returngetDataColumn(context,contentUri,selection,selectionArgs);
}
}
//MediaStore(andgeneral)
elseif("content".equalsIgnoreCase(uri.getScheme())){
returngetDataColumn(context,uri,null,null);
}
//File
elseif("file".equalsIgnoreCase(uri.getScheme())){
returnuri.getPath();
}
returnnull;
}
/**
*GetthevalueofthedatacolumnforthisUri.Thisisusefulfor
*MediaStoreUris,andotherfile-basedContentProviders.
*
*@paramcontextThecontext.
*@paramuriTheUritoquery.
*@paramselection(Optional)Filterusedinthequery.
*@paramselectionArgs(Optional)Selectionargumentsusedinthequery.
*@returnThevalueofthe_datacolumn,whichistypicallyafilepath.
*/
publicstaticStringgetDataColumn(Contextcontext,Uriuri,Stringselection,
String[]selectionArgs){
Cursorcursor=null;
finalStringcolumn="_data";
finalString[]projection={column};
try{
cursor=context.getContentResolver().query(uri,projection,selection,selectionArgs,
null);
if(cursor!=null&&cursor.moveToFirst()){
finalintcolumn_index=cursor.getColumnIndexOrThrow(column);
returncursor.getString(column_index);
}
}finally{
if(cursor!=null)
cursor.close();
}
returnnull;
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisExternalStorageProvider.
*/
publicstaticbooleanisExternalStorageDocument(Uriuri){
return"com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisDownloadsProvider.
*/
publicstaticbooleanisDownloadsDocument(Uriuri){
return"com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
*@paramuriTheUritocheck.
*@returnWhethertheUriauthorityisMediaProvider.
*/
publicstaticbooleanisMediaDocument(Uriuri){
return"com.android.providers.media.documents".equals(uri.getAuthority());
}
}
绝对路径转Uri比较简单
以绝对路径创建一个File对象，然后调用
Uri.fromFile(file)
以上所述是小编给大家介绍的AndroidUri和文件路径互相转换的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！