如何解决如何从下载文件夹中选择的 Uri 获取绝对路径？
当从下载文件夹中选择一些文件时，我想通过 Uri 获取绝对路径。 API 级别 21+。 目前我有这样的错误：
Input Uri: content://com.android.providers.downloads.documents/document/1603
Path: content://downloads/public_downloads/1603
Giving error: java.lang.IllegalArgumentException: Unknown URI: content://downloads/public_downloads/1603
或者这个：
java.io.FileNotFoundException: /document/msf:64020: open failed: ENOENT (No such file or directory)
java.lang.NumberFormatException: For input string: "msf:64020"
取决于我如何访问这些文件。我怎样才能正确地做到这一点？ Maby 您可以提供一些有用的文档链接。谢谢。
这是我目前的解决方案：
private FileUtils() {
}
static final String TAG = "FileUtils";
public static final String MIME_TYPE_AUDIO = "audio/*";
public static final String MIME_TYPE_TEXT = "text/*";
public static final String MIME_TYPE_IMAGE = "image/*";
public static final String MIME_TYPE_VIDEO = "video/*";
public static final String MIME_TYPE_APP = "application/*";
public static final String HIDDEN_PREFIX = ".";
public static String getExtension(String uri) {
if (uri == null) {
return null;
}
int dot = uri.lastIndexOf(".");
if (dot >= 0) {
return uri.substring(dot);
} else {
// No extension.
return "";
}
}
public static boolean isLocal(String url) {
return url != null && !url.startsWith("http://") && !url.startsWith("https://");
}
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
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;
}
public static String getPath(final Context context,final Uri uri) {
// 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];
}
}
// DownloadsProvider ----- This if-else is working wrong.
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),Long.parseLong(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,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);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
public static File getFile(Context context,Uri uri) {
if (uri != null) {
String path = getPath(context,uri);
if (!Strings.isNullOrEmpty(path) && isLocal(path)) {
return new File(path);
}
}
return null;
}
public static Intent createGetContentIntent(String mimeType) {
final Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.setType(mimeType);
// Only return URIs that can be opened with ContentResolver
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
return intent;
}
}
And this is in myActivity:
public void checkPermission() {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED ||
ContextCompat.checkSelfPermission(this,Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA,Manifest.permission.READ_EXTERNAL_STORAGE},IMAGE_PICKER_PERMISSION_KEY);
} else {
startImagePickerActivity();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,@NonNull String[] permissions,@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode,permissions,grantResults);
if (requestCode == IMAGE_PICKER_PERMISSION_KEY && grantResults.length == 2
&& grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
startImagePickerActivity();
}
}
public void onActivityResult(int requestCode,int resultCode,Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (resultCode == RESULT_OK && data != null) {
if (requestCode == REQUEST_CODE_CHOOSE) {
ClipData clipData = data.getClipData();
if (clipData != null) {
//user choose 2+ images
int i = 0;
while (i < clipData.getItemCount()) {
onPhotoAdded(clipData.getItemAt(i).getUri());
i++;
}
} else if (data.getData() != null) {
//user choose only 1 image
onPhotoAdded(data.getData());
}
}
}
}
public void onPhotoAdded(Uri uri) {
try {
File f = FileUtils.getFile(this,uri);
if (f == null) {
Log.d("LOG","File is null");
} else {
listOfUri.add(uri);
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
Log.d("LOG",e.getMessage());
}
}
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