在Android 4.4 (KitKat)的新图库访问之前，我用这个方法在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_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
现在来看意图。ACTION_GET_CONTENT返回不同的数据:
之前:
content://media/external/images/media/62
Now:
content://com.android.providers.media.documents/document/image:62
我怎样才能获得SD卡上的真实路径?
我也有同样的问题。我需要的文件名，以便能够上传到一个网站。
如果我将意图改为PICK，这对我来说是有效的。
这在AVD for Android 4.4和AVD for Android 2.1中进行了测试。
增加权限READ_EXTERNAL_STORAGE
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
改变意图:
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI
);
startActivityForResult(i, 66453666);
/* OLD CODE
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser( intent, "Select Image" ),
66453666
);
*/
我不需要改变我的代码得到实际的路径:
// 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 : "";
}
试试这个:
//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);
这将从MediaProvider、DownloadsProvider和ExternalStorageProvider获取文件路径，同时回落到您提到的非官方的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());
}
这些是从我的开源库aFileChooser中截取的。
这个答案是基于你有些模糊的描述。我假设你用行动触发了一个意图:意图。ACTION_GET_CONTENT
现在你得到内容://com.android。providers。media。documents/document/image:62返回，而不是之前的媒体提供者URI，对吗?
在Android 4.4 (KitKat)上，当一个Intent被打开时，新的DocumentsActivity被打开。ACTION_GET_CONTENT被触发，从而导致网格视图(或列表视图)，在那里你可以选择一个图像，这将返回以下uri调用context(示例):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)。
然而，您可以访问gallery和其他响应Intent的活动。通过使用DocumentsActivity中的抽屉来ACTION_GET_CONTENT(从左到右拖动，您将看到一个有Gallery可供选择的抽屉UI)。就像奇巧之前一样。
If you still which to pick in DocumentsActivity class and need the file URI, you should be able to do the following (warning this is hacky!) query (with contentresolver):content://com.android.providers.media.documents/document/image:62 URI and read the _display_name value from the cursor. This is somewhat unique name (just the filename on local files) and use that in a selection (when querying) to mediaprovider to get the correct row corresponding to this selection from here you can fetch the file URI as well.
访问文档提供程序的推荐方法可以在这里找到(获取一个输入流或文件描述符来读取文件/位图):
使用documentprovider的例子
我也有同样的问题。我需要的文件名，以便能够上传到一个网站。
如果我将意图改为PICK，这对我来说是有效的。
这在AVD for Android 4.4和AVD for Android 2.1中进行了测试。
增加权限READ_EXTERNAL_STORAGE
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
改变意图:
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI
);
startActivityForResult(i, 66453666);
/* OLD CODE
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser( intent, "Select Image" ),
66453666
);
*/
我不需要改变我的代码得到实际的路径:
// 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 : "";
}
