问题描述
我的应用程序正在迁移到SAF,或者至少正在进行一些实验.
My app is migrating to SAF or, at least some experimentation is going about.
现在,它必须将文件从私有应用程序文件夹复制到已授权的SAF文件夹中.
Now it has to copy a file from private app folder to a SAF folder that was authorized.
使用的方法是:
static boolean copyFileToTargetFolderWithNewName(Activity activity, String filePath,String targetFolderUri,String newName)
{
File file = new File(filePath);
FileInputStream fis=null;
Uri docUri=null;
try {
fis=new FileInputStream(file);
} catch (FileNotFoundException e) {
return false;
}
deleteIfExisting(activity,Uri.parse(targetFolderUri),newName);
ContentResolver resolver = activity.getContentResolver();
boolean result=false;
int offset=filePath.lastIndexOf(".");
String ext="";
if (offset!=-1) ext=filePath.substring(offset+1);
String mimetype = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext);
try {
//error here
docUri=DocumentsContract.createDocument(resolver,Uri.parse(targetFolderUri),mimetype,newName);
} catch (FileNotFoundException e) {
result=false;
}
try {
ParcelFileDescriptor pfd=resolver.openFileDescriptor(docUri, "w");
FileOutputStream fos=new FileOutputStream(pfd.getFileDescriptor());
int b;
while ((b=fis.read()) != -1)
fos.write(b);
fis.close();
fos.close();
pfd.close();
result= true;
} catch (FileNotFoundException e) {
result=false;
} catch (IOException e) {
result=false;
}
return result;
}
我知道
java.lang.IllegalArgumentException: Invalid URI: content://com.android.providers.downloads.documents/tree/raw%3A%2Fstorage%2Femulated%2F0%2FDownload%2Ffolder/subfolder
该文件夹是通过以下方法创建的:
the folder was created by means of this method:
static public DocumentFile createFolderInFolder(Activity activity,String parentFolderUriString,String folderName)
{
DocumentFile result=null;
ContentResolver contentResolver;
contentResolver = activity.getContentResolver();
Uri parentFolderUri=null;
Uri oldParentUri = Uri.parse(parentFolderUriString);
String id = DocumentsContract.getTreeDocumentId(oldParentUri );
parentFolderUri= DocumentsContract.buildChildDocumentsUriUsingTree(oldParentUri , id);
/*
String id=DocumentsContract.getTreeDocumentId(Uri.parse(parentFolderUriString));
id=StringUtils.fromLastSlashRight(parentFolderUriString);
parentFolderUri= DocumentsContract.buildTreeDocumentUri(PROVIDER_AUTHORITY,id
);
*/
DocumentFile parentFolder = DocumentFile.fromTreeUri(activity, parentFolderUri);
result=parentFolder.createDirectory(folderName);
/*try {
result=DocumentsContract.createDocument(contentResolver,parentFolderUri,DocumentsContract.Document.MIME_TYPE_DIR,folderName);
} catch (FileNotFoundException e) {
result =null;
}*/
return result;
}
如您所见,创建的早期版本被注释掉,因为它不起作用.必须使用DocumentFile,但似乎与DocumentsContract不兼容.我错了吗?
as you can see, a previous version of the creation is commented because it did not work.It was necessary to use DocumentFile, but it seems that there are incompatibilities with DocumentsContract. Am I wrong?
SAF损坏了吗?还是我在转转?
So is SAF broken?Or am I circling around?
推荐答案
使用本地文件的完整路径以及ACTION_OPEN_DOCUMENT_TREE获得的contentcheme调用以下代码时,会将文件复制到该saf位置,使用的名称相同或不同.由您决定.
Following code when called with a full path to a local file and the contentscheme obtained by ACTION_OPEN_DOCUMENT_TREE copies the file to that saf location under the same or a different name that is up to you.
public static boolean copyFileToSafFolder(Context context, String filePath, String rootPath, String destFileName ) {
Uri uri = Uri.parse(rootPath);
String docId = DocumentsContract.getTreeDocumentId(uri);
Uri dirUri = DocumentsContract.buildDocumentUriUsingTree(uri, docId );
Uri destUri = null;
try
{
destUri = DocumentsContract.createDocument(context.getContentResolver(), dirUri, "*/*", destFileName);
} catch (FileNotFoundException e )
{
e.printStackTrace();
return false;
}
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(filePath);
os = context.getContentResolver().openOutputStream( destUri, "w");
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0)
os.write(buffer, 0, length);
is.close();
os.flush();
os.close();
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
这篇关于SAF-来自DocumentsContract.createDocument方法的无效URI错误(FileOutputStream副本)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!