Android将具有ACTION_GET_CONTENT结果的文件打开到不同的Uri [英] Android opening a file with ACTION_GET_CONTENT results into different Uri's
本文介绍了Android将具有ACTION_GET_CONTENT结果的文件打开到不同的Uri的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用Intent.ACTION_GET_CONTENT打开文件.
取决于Android版本/设备品牌，文件浏览器会打开，我会得到以下结果:
从Downloads选择文件:
content://com.android.providers.downloads.documents/document/446
从Fotos选择文件:
content://media/external/images/media/309
从FileCommander选择文件:
file:///storage/emulated/0/DCIM/Camera/20141027_132114.jpg
我可以打开所有这些文件，但当我尝试从Downloads,，Audio，Afbeeldingen(图像)打开文件时
我可能无法处理这种Uri:content://com.android.providers.downloads.documents/document/446
我尝试了以下操作:
- 尝试通过新File(uri.getPath())打开文件. File.exists()返回false.
- 尝试通过getContext().getContentResolver().openInputStream(uri)打开/访问文件.结果进入FileNotFoundException
-
尝试使用以下代码打开文件:
public static String getRealPathFromURI_API19(Context context, Uri uri) { Log.i("uri", uri.getPath()); String filePath = ""; if (uri.getScheme().equals("file")) { return uri.getPath(); } else if (DocumentsContract.isDocumentUri(context, uri)) { String wholeID = DocumentsContract.getDocumentId(uri); Log.i("wholeID", wholeID); // Split at colon, use second item in the array String[] splits = wholeID.split(":"); if (splits.length == 2) { String id = splits[1]; String[] column = {MediaStore.Images.Media.DATA}; // where id is equal to String sel = MediaStore.Images.Media._ID + "=?"; Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, column, sel, new String[]{id}, null); int columnIndex = cursor.getColumnIndex(column[0]); if (cursor.moveToFirst()) { filePath = cursor.getString(columnIndex); } cursor.close(); } } else { filePath = AttachmentUtils.getPath(context, uri); } return filePath; }
我在做什么错了?
更新: 我注意到屏幕快照中列出的文件在存储中实际上并不存在. 我使用的设备是该公司的平板电脑，其中包含垃圾数据.我的同事告诉我，该设备曾经与其他Google帐户关联.这些文件可能是以前帐户中不再存在/无法访问的文件.
我对此的结论是，我在Android中遇到了一些错误. 我的错误报告
更新2017年2月6日:
Android禁止file:// URI.请考虑考虑.
禁止记录:Uri Scheme迄今为止，最大的兼容性问题是 Android 7.0禁止在Uri值中使用file:方案， 影响.如果您尝试传递文件:意图中的Uri 到另一个应用程序-无论是通过附加应用程序还是作为应用程序的数据"构面 目的-您将崩溃，并抛出FileUriExposedException异常.你 放置文件时会遇到类似的问题: ClipData中的剪贴板.这来自于的更新版本 StrictMode. StrictMode.VmPolicy.Builder有一个 惩罚DeathOnFileUriExposure()方法，该方法触发对 文件:Uri值和产生的FileUriExposedException异常. 而且，这似乎是预先配置的，就像StrictMode的方式一样 预配置为应用刑罚DeathOnNetwork()(您的源 NetworkOnMainThreadException崩溃).
解决方案
使用下面的代码.这将肯定起作用.
public static String getPath(Context context, Uri uri) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// DocumentProvider
if (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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
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());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
使用以下代码以任何格式浏览文件.
public void browseClick() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
//intent.putExtra("browseCoa", itemToBrowse);
//Intent chooser = Intent.createChooser(intent, "Select a File to Upload");
try {
//startActivityForResult(chooser, FILE_SELECT_CODE);
startActivityForResult(Intent.createChooser(intent, "Select a File to Upload"),FILE_SELECT_CODE);
} catch (Exception ex) {
System.out.println("browseClick :"+ex);//android.content.ActivityNotFoundException ex
}
}
然后在onActivityResult中获取该文件路径，如下所示.
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FILE_SELECT_CODE) {
if (resultCode == RESULT_OK) {
try {
Uri uri = data.getData();
if (filesize >= FILE_SIZE_LIMIT) {
Toast.makeText(this,"The selected file is too large. Selet a new file with size less than 2mb",Toast.LENGTH_LONG).show();
} else {
String mimeType = getContentResolver().getType(uri);
if (mimeType == null) {
String path = getPath(this, uri);
if (path == null) {
filename = FilenameUtils.getName(uri.toString());
} else {
File file = new File(path);
filename = file.getName();
}
} else {
Uri returnUri = data.getData();
Cursor returnCursor = getContentResolver().query(returnUri, null, null, null, null);
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
filename = returnCursor.getString(nameIndex);
String size = Long.toString(returnCursor.getLong(sizeIndex));
}
File fileSave = getExternalFilesDir(null);
String sourcePath = getExternalFilesDir(null).toString();
try {
copyFileStream(new File(sourcePath + "/" + filename), uri,this);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private void copyFileStream(File dest, Uri uri, Context context)
throws IOException {
InputStream is = null;
OutputStream os = null;
try {
is = context.getContentResolver().openInputStream(uri);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
is.close();
os.close();
}
}
此后，您可以从应用程序外部存储中打开此文件，并通过适当的操作将文件保存在该文件中.
I am trying to open files by using Intent.ACTION_GET_CONTENT.
Dependent on the Android version/device brand the file browser opens and I get the following results:
Selecting a file from Downloads:
content://com.android.providers.downloads.documents/document/446
Selecting a file from Fotos:
content://media/external/images/media/309
Selecting a file from FileCommander:
file:///storage/emulated/0/DCIM/Camera/20141027_132114.jpg
I can open all these files except when I try to open a file from Downloads,, Audio , Afbeeldingen(Images)
It's likely I can't handle this kind of Uri: content://com.android.providers.downloads.documents/document/446
I have tried the following things:
- Trying to open the file by new File(uri.getPath()). File.exists() returns false.
- Trying to open/reach the file by getContext().getContentResolver().openInputStream(uri). Results into a FileNotFoundException
Trying to open the file with the following code:
public static String getRealPathFromURI_API19(Context context, Uri uri) { Log.i("uri", uri.getPath()); String filePath = ""; if (uri.getScheme().equals("file")) { return uri.getPath(); } else if (DocumentsContract.isDocumentUri(context, uri)) { String wholeID = DocumentsContract.getDocumentId(uri); Log.i("wholeID", wholeID); // Split at colon, use second item in the array String[] splits = wholeID.split(":"); if (splits.length == 2) { String id = splits[1]; String[] column = {MediaStore.Images.Media.DATA}; // where id is equal to String sel = MediaStore.Images.Media._ID + "=?"; Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, column, sel, new String[]{id}, null); int columnIndex = cursor.getColumnIndex(column[0]); if (cursor.moveToFirst()) { filePath = cursor.getString(columnIndex); } cursor.close(); } } else { filePath = AttachmentUtils.getPath(context, uri); } return filePath; }
What am I doing wrong?
UPDATE: I have noticed that the files that are listed in the screenshot that they are not physically existing in the storage. The device I am using is a tablet from the company containing rubbish data. My colleague told me that this device once was connected with a different Google account. These files could be the files from the previous account which are not existing/reachable anymore.
My own conclusion about it is that I am encountering some bug in Android. My bug report
Update 6 february 2017:
Android banned the file:// URI. Please consider to think about it.
Ban on file: Uri Scheme The biggest compatibility issue so far with Android 7.0 is that the file: scheme for Uri values is banned, in effect. If you attempt to pass a file: Uri in an Intent that is going to another app — whether via an extra or as the "data" facet of the Intent — you will crash with a FileUriExposedException exception. You will face similar issues with putting file: Uri values on the clipboard in ClipData . This is coming from an updated edition of StrictMode . StrictMode.VmPolicy.Builder has a penaltyDeathOnFileUriExposure() method that triggers the detection of file: Uri values and the resulting FileUriExposedException exceptions. And, it appears that this is pre-configured, much as how StrictMode is pre-configured to apply penaltyDeathOnNetwork() (the source of your NetworkOnMainThreadException crashes).
解决方案
Use below code.This will work for sure.
public static String getPath(Context context, Uri uri) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// DocumentProvider
if (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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
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());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
Use the below code to browse the file in any format.
public void browseClick() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
//intent.putExtra("browseCoa", itemToBrowse);
//Intent chooser = Intent.createChooser(intent, "Select a File to Upload");
try {
//startActivityForResult(chooser, FILE_SELECT_CODE);
startActivityForResult(Intent.createChooser(intent, "Select a File to Upload"),FILE_SELECT_CODE);
} catch (Exception ex) {
System.out.println("browseClick :"+ex);//android.content.ActivityNotFoundException ex
}
}
Then get that file path in the onActivityResult like below.
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FILE_SELECT_CODE) {
if (resultCode == RESULT_OK) {
try {
Uri uri = data.getData();
if (filesize >= FILE_SIZE_LIMIT) {
Toast.makeText(this,"The selected file is too large. Selet a new file with size less than 2mb",Toast.LENGTH_LONG).show();
} else {
String mimeType = getContentResolver().getType(uri);
if (mimeType == null) {
String path = getPath(this, uri);
if (path == null) {
filename = FilenameUtils.getName(uri.toString());
} else {
File file = new File(path);
filename = file.getName();
}
} else {
Uri returnUri = data.getData();
Cursor returnCursor = getContentResolver().query(returnUri, null, null, null, null);
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
returnCursor.moveToFirst();
filename = returnCursor.getString(nameIndex);
String size = Long.toString(returnCursor.getLong(sizeIndex));
}
File fileSave = getExternalFilesDir(null);
String sourcePath = getExternalFilesDir(null).toString();
try {
copyFileStream(new File(sourcePath + "/" + filename), uri,this);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private void copyFileStream(File dest, Uri uri, Context context)
throws IOException {
InputStream is = null;
OutputStream os = null;
try {
is = context.getContentResolver().openInputStream(uri);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
is.close();
os.close();
}
}
After this you can open this file from your application external storage where you saved the file with appropriate action.
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