从URI获取真实路径,Android KitKat新存储访问框架
在(KitKat)中的新图库访问之前,我使用以下方法在SD卡上获得了我的真实路径:从URI获取真实路径,Android KitKat新存储访问框架,android,path,uri,android-4.4-kitkat,Android,Path,Uri,Android 4.4 Kitkat,在(KitKat)中的新图库访问之前,我使用以下方法在SD卡上获得了我的真实路径: public String getPath(Uri uri) { String[] projection = { MediaStore.Images.Media.DATA }; Cursor cursor = managedQuery(uri, projection, null, null, null); startManagingCursor(cursor); int column_in
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
startManagingCursor(cursor);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
现在,Intent.ACTION\u GET\u内容返回不同的数据:
之前:
content://media/external/images/media/62
现在:
我怎样才能获得SD卡上的真实路径?这个答案基于您的模糊描述。我假设你用动作触发了一个意图:
intent.action\u GET\u CONTENT
现在你得到了content://com.android.providers.media.documents/document/image:62
back而不是以前的媒体提供商URI,对吗
在Android 4.4(KitKat)上,新的DocumentsActivity会在触发意图.ACTION\u GET\u CONTENT
时打开,从而导致网格视图(或列表视图),您可以在其中选择图像,这会将以下URI返回到调用上下文(示例):content://com.android.providers.media.documents/document/image:62
(这些是新文档提供程序的URI,它通过向客户端提供通用文档提供程序URI来抽象底层数据)
但是,您可以通过使用DocumentsActivity中的抽屉(从左到右拖动,您将看到一个抽屉用户界面,其中有图库可供选择)访问图库和响应意图的其他活动。操作\u获取内容
。
如果您仍然需要在DocumentsActivity类中选择哪个,并且需要文件URI,那么您应该能够执行以下查询(警告这是黑客行为!)(使用contentresolver):content://com.android.providers.media.documents/document/image:62
URI并从光标读取_display_name值。这是一个有点独特的名称(仅本地文件上的文件名)并在选择(查询时)mediaprovider时使用该文件名,以获取与此选择对应的正确行。从这里,您还可以获取文件URI
可在此处找到访问文档提供程序的推荐方法(获取inputstream或文件描述符以读取文件/位图):
在KitKat的新画廊访问之前,我用这种方法在sdcard中获得了我的真实路径
这从来都不可靠。不要求从ACTION\u GET\u CONTENT
或ACTION\u PICK
请求返回的Uri
必须由MediaStore
索引,甚至必须表示文件系统上的文件。例如,Uri
可以表示流,其中加密的文件会在运行中为您解密
如何获取SD卡中的真实路径
不要求存在与Uri
对应的文件
是的,我真的需要一条路
然后将文件从流复制到您自己的临时文件,并使用它。更好的是,直接使用流,避免使用临时文件
我已更改我的意图。操作\u获取\u意图的内容。操作\u拾取
这对您的情况没有帮助。
ACTION\u PICK
响应不一定是针对文件系统中有文件的Uri
,您可以通过某种方式神奇地派生该文件。注意:这个答案解决了部分问题。要获得完整的解决方案(以库的形式),请参阅。
您可以使用URI获取文档id
,然后查询MediaStore.Images.Media.EXTERNAL\u CONTENT\u URI
或MediaStore.Images.Media.INTERNAL\u CONTENT\u URI
(取决于SD卡的情况)
要获取文档id,请执行以下操作:
// Will return "image:x*"
String wholeID = DocumentsContract.getDocumentId(uriThatYouCurrentlyHave);
// Split at colon, use second item in the array
String id = wholeID.split(":")[1];
String[] column = { MediaStore.Images.Media.DATA };
// where id is equal to
String sel = MediaStore.Images.Media._ID + "=?";
Cursor cursor = getContentResolver().
query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
column, sel, new String[]{ id }, null);
String filePath = "";
int columnIndex = cursor.getColumnIndex(column[0]);
if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
参考:我找不到此解决方案的来源。我想请原始海报在此处投稿。今晚我会再看一些。尝试以下内容:
//KITKAT
i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, CHOOSE_IMAGE_REQUEST);
在onActivityResult中使用以下命令:
Uri selectedImageURI = data.getData();
input = c.getContentResolver().openInputStream(selectedImageURI);
BitmapFactory.decodeStream(input , null, opts);
我有完全相同的问题。我需要文件名,以便能够上传到一个网站 如果我改变了选择的意图,这对我是有效的。 这在安卓4.4的AVD和安卓2.1的AVD中进行了测试 添加权限读取外部存储:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
我无需更改代码即可获得实际路径:
// Convert the image URI to the direct file system path of the image file
public String mf_szGetRealPathFromURI(final Context context, final Uri ac_Uri )
{
String result = "";
boolean isok = false;
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = context.getContentResolver().query(ac_Uri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
result = cursor.getString(column_index);
isok = true;
} finally {
if (cursor != null) {
cursor.close();
}
}
return isok ? result : "";
}
下面的答案是由写在一个已经不存在的页面上的,因为他没有足够的代表回答一个问题,我正在发布它。我没有学分
public String getImagePath(Uri uri){
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
String document_id = cursor.getString(0);
document_id = document_id.substring(document_id.lastIndexOf(":")+1);
cursor.close();
cursor = getContentResolver().query(
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
null, MediaStore.Images.Media._ID + " = ? ", new String[]{document_id}, null);
cursor.moveToFirst();
String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
cursor.close();
return path;
}
编辑:代码上有一个流;如果设备有多个外部存储器(外部SD卡、外部usb等),以上代码在非主存储中不起作用。这将从MediaProvider、DownloadsProvider和ExternalStorageProvider获取文件路径,同时返回到您提到的非官方ContentProvider方法
/**
* Get a file path from a Uri. This will get the the path for Storage Access
* Framework Documents, as well as the _data field for the MediaStore and
* other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @author paulburke
*/
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && 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 getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
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 column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
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());
}
这些都取自我的开源库。我们需要在早期的onActivityResult()的gallery picker代码中进行以下更改/修复,以便在(KitKat)和所有其他早期版本上无缝运行
Uri selectedImgFileUri = data.getData();
if (selectedImgFileUri == null ) {
// The user has not selected any photo
}
try {
InputStream input = mActivity.getContentResolver().openInputStream(selectedImgFileUri);
mSelectedPhotoBmp = BitmapFactory.decodeStream(input);
}
catch (Throwable tr) {
// Show message to try again
}
这是的更新版本。在下面的版本(KitKat)中,我们没有该类 要处理KitKat以下的版本,请创建此类:
public class DocumentsContract {
private static final String DOCUMENT_URIS =
"com.android.providers.media.documents " +
"com.android.externalstorage.documents " +
"com.android.providers.downloads.documents " +
"com.android.providers.media.documents";
private static final String PATH_DOCUMENT = "document";
private static final String TAG = DocumentsContract.class.getSimpleName();
public static String getDocumentId(Uri documentUri) {
final List<String> paths = documentUri.getPathSegments();
if (paths.size() < 2) {
throw new IllegalArgumentException("Not a document: " + documentUri);
}
if (!PATH_DOCUMENT.equals(paths.get(0))) {
throw new IllegalArgumentException("Not a document: " + documentUri);
}
return paths.get(1);
}
public static boolean isDocumentUri(Uri uri) {
final List<String> paths = uri.getPathSegments();
Logger.v(TAG, "paths[" + paths + "]");
if (paths.size() < 2) {
return false;
}
if (!PATH_DOCUMENT.equals(paths.get(0))) {
return false;
}
return DOCUMENT_URIS.contains(uri.getAuthority());
}
}
公共类文档合同{
私有静态最终字符串文档\u URI=
“com.android.providers.media.documents”+
“com.android.externalstorage.documents”+
“com.android.providers.downloads.documents”+
“com.android.providers.media.documents”;
私有静态最终字符串路径\u DOCUMENT=“DOCUMENT”;
私有静态最终字符串标记=DocumentsContract.class.getSimpleName();
公共静态字符串getDocumentId(Uri documentUri){
最终列表路径=documentUri.getPathSegments();
if(path.size()<2){
抛出新的IllegalArgumentException(“不是文档:+documentUri”);
}
如果(!PATH_DOCUMENT.equals(PATH.get(0))){
抛出新的IllegalArgumentException(“不是文档:+documentUri”);
}
返回路径。get(1);
}
公共静态布尔值isDocumentUri(Uri){
最终的
Uri selectedImgFileUri = data.getData();
if (selectedImgFileUri == null ) {
// The user has not selected any photo
}
try {
InputStream input = mActivity.getContentResolver().openInputStream(selectedImgFileUri);
mSelectedPhotoBmp = BitmapFactory.decodeStream(input);
}
catch (Throwable tr) {
// Show message to try again
}
public class DocumentsContract {
private static final String DOCUMENT_URIS =
"com.android.providers.media.documents " +
"com.android.externalstorage.documents " +
"com.android.providers.downloads.documents " +
"com.android.providers.media.documents";
private static final String PATH_DOCUMENT = "document";
private static final String TAG = DocumentsContract.class.getSimpleName();
public static String getDocumentId(Uri documentUri) {
final List<String> paths = documentUri.getPathSegments();
if (paths.size() < 2) {
throw new IllegalArgumentException("Not a document: " + documentUri);
}
if (!PATH_DOCUMENT.equals(paths.get(0))) {
throw new IllegalArgumentException("Not a document: " + documentUri);
}
return paths.get(1);
}
public static boolean isDocumentUri(Uri uri) {
final List<String> paths = uri.getPathSegments();
Logger.v(TAG, "paths[" + paths + "]");
if (paths.size() < 2) {
return false;
}
if (!PATH_DOCUMENT.equals(paths.get(0))) {
return false;
}
return DOCUMENT_URIS.contains(uri.getAuthority());
}
}