我有一个onActivityResult从一个mediastore图像选择返回，我可以获得一个图像使用以下URI:
Uri selectedImage = data.getData();
将this转换为字符串会得到:
content://media/external/images/media/47
或路径给出:
/external/images/media/47
然而，我似乎找不到一种方法将其转换为绝对路径，因为我想将图像加载到位图中，而不必复制到某个地方。我知道这可以使用URI和内容解析器来完成，但这似乎在重新启动手机时中断，我猜MediaStore在重新启动之间没有保持其编号相同。
当前回答
简单易行。您可以像下面这样从URI执行此操作!
public void getContents(Uri uri)
{
Cursor vidCursor = getActivity.getContentResolver().query(uri, null, null,
null, null);
if (vidCursor.moveToFirst())
{
int column_index =
vidCursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
Uri filePathUri = Uri.parse(vidCursor .getString(column_index));
String video_name = filePathUri.getLastPathSegment().toString();
String file_path=filePathUri.getPath();
Log.i("TAG", video_name + "\b" file_path);
}
}
其他回答
现有的很好的答案，其中一些是我自己想出来的:
我必须从URI中获取路径，并从路径中获取URI，谷歌很难区分，因此对于任何有相同问题的人(例如，从MediaStore中获取视频的缩略图，其物理位置您已经拥有)。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(或正在查询的任何子部分)存储文件路径，因此您可以使用已知的内容查找DATA字段，也可以使用该字段查找所需的任何其他内容。
然后，我进一步使用上述方案来确定如何处理我的数据:
private boolean getSelectedVideo(Intent imageReturnedIntent, boolean fromData) {
Uri selectedVideoUri;
//Selected image returned from another activity
// A parameter I pass myself to know whether or not I'm being "shared via" or
// whether I'm working internally to my app (fromData = working internally)
if(fromData){
selectedVideoUri = imageReturnedIntent.getData();
} else {
//Selected image returned from SEND intent
// which I register to receive in my manifest
// (so people can "share via" my app)
selectedVideoUri = (Uri)getIntent().getExtras().get(Intent.EXTRA_STREAM);
}
Log.d(TAG,"SelectedVideoUri = " + selectedVideoUri);
String filePath;
String scheme = selectedVideoUri.getScheme();
ContentResolver contentResolver = getContentResolver();
long videoId;
// If we are sent file://something or content://org.openintents.filemanager/mimetype/something...
if(scheme.equals("file") || (scheme.equals("content") && selectedVideoUri.getEncodedAuthority().equals("org.openintents.filemanager"))){
// Get the path
filePath = selectedVideoUri.getPath();
// Trim the path if necessary
// openintents filemanager returns content://org.openintents.filemanager/mimetype//mnt/sdcard/xxxx.mp4
if(filePath.startsWith("/mimetype/")){
String trimmedFilePath = filePath.substring("/mimetype/".length());
filePath = trimmedFilePath.substring(trimmedFilePath.indexOf("/"));
}
// Get the video ID from the path
videoId = getVideoIdFromFilePath(filePath, contentResolver);
} else if(scheme.equals("content")){
// If we are given another content:// URI, look it up in the media provider
videoId = Long.valueOf(selectedVideoUri.getLastPathSegment());
filePath = getFilePathFromContentUri(selectedVideoUri, contentResolver);
} else {
Log.d(TAG,"Failed to load URI " + selectedVideoUri.toString());
return false;
}
return true;
}
现在事情变得复杂了，尤其是在API级别为29的Android Q之后。
You must requestLegacyStorage in the manifest.xml. This is how you should get filename from the content Uri public static String getNameFromContentUri(Context context, Uri contentUri){ Cursor returnCursor = context.getContentResolver().query(contentUri, null, null, null, null); int nameColumnIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME); returnCursor.moveToFirst(); String fileName = returnCursor.getString(nameColumnIndex); return fileName;} and this is how you get full path of the Content Uri for all android versions
JAVA
public static String getFullPathFromContentUri(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 ("com.android.externalstorage.documents".equals(uri.getAuthority())) {
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];
}//non-primary e.g sd card
else {
if (Build.VERSION.SDK_INT > 20) {
//getExternalMediaDirs() added in API 21
File extenal[] = context.getExternalMediaDirs();
for (File f : extenal) {
filePath = f.getAbsolutePath();
if (filePath.contains(type)) {
int endIndex = filePath.indexOf("Android");
filePath = filePath.substring(0, endIndex) + split[1];
}
}
}else{
filePath = "/storage/" + type + "/" + split[1];
}
return filePath;
}
}
// DownloadsProvider
else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
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 ("com.android.providers.media.documents".equals(uri.getAuthority())) {
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]
};
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;
}
}
// 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;
}
private 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;
}
科特林
companion object {
@JvmStatic
@SuppressLint("NewApi")
fun getPath(context: Context, uri: Uri): String? {
val isKitKat: Boolean = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
return if ("primary".equals(type, ignoreCase = true)) {
Environment.getExternalStorageDirectory().toString() + "/" + split[1]
} else { // non-primary volumes e.g sd card
var filePath = "non"
//getExternalMediaDirs() added in API 21
val extenal = context.externalMediaDirs
for (f in extenal) {
filePath = f.absolutePath
if (filePath.contains(type)) {
val endIndex = filePath.indexOf("Android")
filePath = filePath.substring(0, endIndex) + split[1]
}
}
filePath
}
} else if (isDownloadsDocument(uri)) {
val id = DocumentsContract.getDocumentId(uri)
val contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))
return getDataColumn(context, contentUri, null, null)
} else if (isMediaDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
var contentUri: Uri? = null
if ("image" == type) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
} else if ("video" == type) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
} else if ("audio" == type) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
val selection = "_id=?"
val selectionArgs = arrayOf(
split[1]
)
return getDataColumn(context, contentUri, selection, selectionArgs)
}
} else if ("content".equals(uri.scheme, ignoreCase = true)) {
return getDataColumn(context, uri, null, null)
} else if ("file".equals(uri.scheme, ignoreCase = true)) {
return uri.path
}
return null
}
private fun getDataColumn(context: Context, uri: Uri?, selection: String?,
selectionArgs: Array<String>?): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(
column
)
try {
cursor = context.contentResolver.query(uri!!, projection, selection, selectionArgs,
null)
if (cursor != null && cursor.moveToFirst()) {
val column_index = cursor.getColumnIndexOrThrow(column)
return cursor.getString(column_index)
}
} catch (e: java.lang.Exception) {
} finally {
cursor?.close()
}
return null
}
private fun isExternalStorageDocument(uri: Uri): Boolean {
return "com.android.externalstorage.documents" == uri.authority
}
private fun isDownloadsDocument(uri: Uri): Boolean {
return "com.android.providers.downloads.documents" == uri.authority
}
private fun isMediaDocument(uri: Uri): Boolean {
return "com.android.providers.media.documents" == uri.authority
}
}
}
简单易行。您可以像下面这样从URI执行此操作!
public void getContents(Uri uri)
{
Cursor vidCursor = getActivity.getContentResolver().query(uri, null, null,
null, null);
if (vidCursor.moveToFirst())
{
int column_index =
vidCursor .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
Uri filePathUri = Uri.parse(vidCursor .getString(column_index));
String video_name = filePathUri.getLastPathSegment().toString();
String file_path=filePathUri.getPath();
Log.i("TAG", video_name + "\b" file_path);
}
}
在这里，我将向您展示如何创建一个BROWSE按钮，当您单击它时，它将打开SD卡，您将选择一个文件，结果您将获得所选文件的文件名和文件路径:
一个你要按的按钮
browse.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent();
intent.setAction(Intent.ACTION_PICK);
Uri startDir = Uri.fromFile(new File("/sdcard"));
startActivityForResult(intent, PICK_REQUEST_CODE);
}
});
获取结果文件名和文件路径的函数
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
if (requestCode == PICK_REQUEST_CODE)
{
if (resultCode == RESULT_OK)
{
Uri uri = intent.getData();
if (uri.getScheme().toString().compareTo("content")==0)
{
Cursor cursor =getContentResolver().query(uri, null, null, null, null);
if (cursor.moveToFirst())
{
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);//Instead of "MediaStore.Images.Media.DATA" can be used "_data"
Uri filePathUri = Uri.parse(cursor.getString(column_index));
String file_name = filePathUri.getLastPathSegment().toString();
String file_path=filePathUri.getPath();
Toast.makeText(this,"File Name & PATH are:"+file_name+"\n"+file_path, Toast.LENGTH_LONG).show();
}
}
}
}
}
Bitmap Bitmap = MediaStore.Images.Media.getBitmap, uri;
