在android中从文件路径获取内容uri

小开

最佳答案

试一试:

ImageView.setImageURI(Uri.fromFile(new File("/sdcard/cats.jpg")));

或:

ImageView.setImageURI(Uri.parse(new File("/sdcard/cats.jpg").toString()));

小开

//此代码适用于2.2上的图像，不确定是否有任何其他媒体类型

   //Your file path - Example here is "/sdcard/cats.jpg"
final String filePathThis = imagePaths.get(position).toString();


MediaScannerConnectionClient mediaScannerClient = new
MediaScannerConnectionClient() {
private MediaScannerConnection msc = null;
{
msc = new MediaScannerConnection(getApplicationContext(), this);
msc.connect();
}


public void onMediaScannerConnected(){
msc.scanFile(filePathThis, null);
}




public void onScanCompleted(String path, Uri uri) {
//This is where you get your content uri
Log.d(TAG, uri.toString());
msc.disconnect();
}
};

小开

对于你的目的，公认的解决方案可能是最好的选择，但实际上要在主题行中回答问题:

在我的应用程序中，我必须从URI中获取路径，从路径中获取URI。前:

/**
* Gets the corresponding path to a file from the given content:// URI
* @param selectedVideoUri The content:// URI to find the file path from
* @param contentResolver The content resolver to use to perform the query.
* @return the file path as a string
*/
private String getFilePathFromContentUri(Uri selectedVideoUri,
ContentResolver contentResolver) {
String filePath;
String[] filePathColumn = {MediaColumns.DATA};


Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);
cursor.moveToFirst();


int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
filePath = cursor.getString(columnIndex);
cursor.close();
return filePath;
}

后者(我用于视频，但也可以用于音频或文件或其他类型的存储内容，通过替换MediaStore。音频(等)MediaStore.Video):

/**
* Gets the MediaStore video ID of a given file on external storage
* @param filePath The path (on external storage) of the file to resolve the ID of
* @param contentResolver The content resolver to use to perform the query.
* @return the video ID as a long
*/
private long getVideoIdFromFilePath(String filePath,
ContentResolver contentResolver) {




long videoId;
Log.d(TAG,"Loading file " + filePath);


// This returns us content://media/external/videos/media (or something like that)
// I pass in "external" because that's the MediaStore's name for the external
// storage on my device (the other possibility is "internal")
Uri videosUri = MediaStore.Video.Media.getContentUri("external");


Log.d(TAG,"videosUri = " + videosUri.toString());


String[] projection = {MediaStore.Video.VideoColumns._ID};


// TODO This will break if we have no matching item in the MediaStore.
Cursor cursor = contentResolver.query(videosUri, projection, MediaStore.Video.VideoColumns.DATA + " LIKE ?", new String[] { filePath }, null);
cursor.moveToFirst();


int columnIndex = cursor.getColumnIndex(projection[0]);
videoId = cursor.getLong(columnIndex);


Log.d(TAG,"Video ID is " + videoId);
cursor.close();
return videoId;
}

基本上，MediaStore的DATA列(或你要查询的任何子部分)存储了文件路径，所以你可以使用该信息来查找它。

小开

更新

这里假设您的媒体(图像/视频)已经添加到内容媒体提供商。如果没有，那么你将无法得到内容URL确切地说，你想要的。取而代之的是文件Uri.

我对我的文件资源管理器活动也有同样的问题。您应该知道，文件的contenturi只支持图像、音频和视频等介质存储数据。我给你的代码获取图像内容uri从选择一个图像从sdcard。试试这个代码，也许它会为你工作…

public static Uri getImageContentUri(Context context, File imageFile) {
String filePath = imageFile.getAbsolutePath();
Cursor cursor = context.getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaStore.Images.Media._ID },
MediaStore.Images.Media.DATA + "=? ",
new String[] { filePath }, null);
if (cursor != null && cursor.moveToFirst()) {
int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
cursor.close();
return Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + id);
} else {
if (imageFile.exists()) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, filePath);
return context.getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
} else {
return null;
}
}
}

支持android Q

public static Uri getImageContentUri(Context context, File imageFile) {
String filePath = imageFile.getAbsolutePath();
Cursor cursor = context.getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[]{MediaStore.Images.Media._ID},
MediaStore.Images.Media.DATA + "=? ",
new String[]{filePath}, null);
if (cursor != null && cursor.moveToFirst()) {
int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
cursor.close();
return Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + id);
} else {
if (imageFile.exists()) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
ContentResolver resolver = context.getContentResolver();
Uri picCollection = MediaStore.Images.Media
.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);
ContentValues picDetail = new ContentValues();
picDetail.put(MediaStore.Images.Media.DISPLAY_NAME, imageFile.getName());
picDetail.put(MediaStore.Images.Media.MIME_TYPE, "image/jpg");
picDetail.put(MediaStore.Images.Media.RELATIVE_PATH,"DCIM/" + UUID.randomUUID().toString());
picDetail.put(MediaStore.Images.Media.IS_PENDING,1);
Uri finaluri = resolver.insert(picCollection, picDetail);
picDetail.clear();
picDetail.put(MediaStore.Images.Media.IS_PENDING, 0);
resolver.update(picCollection, picDetail, null, null);
return finaluri;
}else {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, filePath);
return context.getContentResolver().insert(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
}


} else {
return null;
}
}
}

小开

无需编写任何代码，只需使用adb shell CLI命令即可获得File ID:

adb shell content query --uri "content://media/external/video/media" | grep FILE_NAME | grep -Eo " _id=([0-9]+)," | grep -Eo "[0-9]+"

小开

你可以试试下面的代码片段

    public Uri getUri(ContentResolver cr, String path){
Uri mediaUri = MediaStore.Files.getContentUri(VOLUME_NAME);
Cursor ca = cr.query(mediaUri, new String[] { MediaStore.MediaColumns._ID }, MediaStore.MediaColumns.DATA + "=?", new String[] {path}, null);
if (ca != null && ca.moveToFirst()) {
int id = ca.getInt(ca.getColumnIndex(MediaStore.MediaColumns._ID));
ca.close();
return  MediaStore.Files.getContentUri(VOLUME_NAME,id);
}
if(ca != null) {
ca.close();
}
return null;
}

小开

从文件创建内容Uri content://最简单和最健壮的方法是使用FileProvider。FileProvider提供的Uri也可以用于与其他应用程序共享文件。要从File的绝对路径获取File Uri，你可以使用DocumentFile.fromFile(new File(path, name))，它是在Api 22中添加的，并在以下版本中返回null。

File imagePath = new File(Context.getFilesDir(), "images");
File newFile = new File(imagePath, "default_image.jpg");
Uri contentUri = FileProvider.getUriForFile(getContext(), "com.mydomain.fileprovider", newFile);

小开

你可以根据使用情况来使用这两种方法

Uri uri = Uri.parse("String file location");

或

Uri uri = Uri.fromFile(new File("string file location"));

两种方法我都试过了，结果都有效。

小开

虽然已经晚了，但将来可能会对别人有所帮助。

要获取文件的内容URI，您可以使用以下方法:

FileProvider.getUriForFile(Context context, String authority, File file)

它返回内容URI。

检查这来学习如何设置FileProvider

小开

最好使用验证来支持Android N之前的版本，例如:

  if (Build.VERSION.SDK_INT >=  Build.VERSION_CODES.N) {
imageUri = Uri.parse(filepath);
} else{
imageUri = Uri.fromFile(new File(filepath));
}

  if (Build.VERSION.SDK_INT >=  Build.VERSION_CODES.N) {
ImageView.setImageURI(Uri.parse(new File("/sdcard/cats.jpg").toString()));
} else{
ImageView.setImageURI(Uri.fromFile(new File("/sdcard/cats.jpg")));
}

https://es.stackoverflow.com/questions/71443/reporte-crash-android-os-fileuriexposedexception-en-android-n < a href = " https://es.stackoverflow.com/questions/71443/reporte-crash-android-os-fileuriexposedexception-en-android-n " > < / >