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
这里您可以得到文件的名称
String[] projection = {MediaStore.MediaColumns.DISPLAY_NAME};
Uri uri = data.getData();
String fileName = null;
ContentResolver cr = getActivity().getApplicationContext().getContentResolver();
Cursor metaCursor = cr.query(uri,
projection, null, null, null);
if (metaCursor != null) {
try {
if (metaCursor.moveToFirst()) {
fileName = metaCursor.getString(0);
}
} finally {
metaCursor.close();
}
}
其他回答
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
}
}
}
如果你的系统版本在19以上，这对我来说是完美的，希望这能帮助你。
@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {
final boolean isOverKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isOverKitKat && 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
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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
这里您可以得到文件的名称
String[] projection = {MediaStore.MediaColumns.DISPLAY_NAME};
Uri uri = data.getData();
String fileName = null;
ContentResolver cr = getActivity().getApplicationContext().getContentResolver();
Cursor metaCursor = cr.query(uri,
projection, null, null, null);
if (metaCursor != null) {
try {
if (metaCursor.moveToFirst()) {
fileName = metaCursor.getString(0);
}
} finally {
metaCursor.close();
}
}
这是我的例子获取文件名，从URI file://…内容://... .这是为我工作，不仅与Android MediaStore，而且与第三方应用程序，如EzExplorer。
public static String getFileNameByUri(Context context, Uri uri)
{
String fileName="unknown";//default fileName
Uri filePathUri = uri;
if (uri.getScheme().toString().compareTo("content")==0)
{
Cursor cursor = context.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"
filePathUri = Uri.parse(cursor.getString(column_index));
fileName = filePathUri.getLastPathSegment().toString();
}
}
else if (uri.getScheme().compareTo("file")==0)
{
fileName = filePathUri.getLastPathSegment().toString();
}
else
{
fileName = fileName+"_"+filePathUri.getLastPathSegment();
}
return fileName;
}
Bitmap Bitmap = MediaStore.Images.Media.getBitmap, uri;
