我想选择存在于SD卡中的文件而不是内部存储器并上传它的服务器,但是我无法获得其获取其大小的路径.我已经开始使用以下代码选择文件的意图：
intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
String[] mimetypes = {"application/*"};
intent.putExtra(Intent.EXTRA_MIME_TYPES,mimetypes);
startActivityForResult(
Intent.createChooser(intent,"Select a File to Upload"),FILE_SELECT_CODE);
为了获取文件的路径,我使用this answer并且它正在工作,除非用户从sdcard(可移动)中选择任何文件.当我调试代码并发现该类型不是主要类型时,它不会进入这种情况：
if("primary".equalsIgnoreCase(type)){
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
所以我的问题是它还有什么呢？即如果类型不是主要的？在这种情况下我们如何获得文件路径？我已经搜索了许多问题和教程,其中任何一个都没有.我还尝试了其他部分this answer,但它不起作用,因为System.getenv()为“SECONDARY_STORAGE”返回null,为“EXTERNAL_STORAGE”返回sdcard.我尝试时遇到文件未找到异常：
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}else{
return System.getenv("EXTERNAL_STORAGE") + "/" + split[1];
}
文件的Uri和doc Id看起来像：
Uri: content://com.android.externalstorage.documents/document/0EF9-3110%3Adevice-2016-12-02-130553.png
docId: 0EF9-3110:device-2016-12-02-130553.png
任何帮助？
解决方法
花了一些时间在Android设备管理器上后我找到了解决方案,这里是：
如果doc type id不是primary,那么我使用以下命令创建路径：
filePath = "/storage/" + type + "/" + split[1];
编辑：如果是DocumentUri,请根据文件类型选择contentUri
这是完整的功能：
public static String getRealPathFromURI_API19(Context context,Uri uri) {
String filePath = "";
// 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];
} else {
if (Build.VERSION.SDK_INT > 20) {
//getExternalMediaDirs() added in API 21
File extenal[] = context.getExternalMediaDirs();
if (extenal.length > 1) {
filePath = extenal[1].getAbsolutePath();
filePath = filePath.substring(0,filePath.indexOf("Android")) + split[1];
}
}else{
filePath = "/storage/" + type + "/" + split[1];
}
return filePath;
}
} else if (isDownloadsDocument(uri)) {
// DownloadsProvider
final String id = DocumentsContract.getDocumentId(uri);
//final Uri contentUri = ContentUris.withAppendedId(
// Uri.parse("content://downloads/public_downloads"),Long.valueOf(id));
Cursor cursor = null;
final String column = "_data";
final String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri,projection,null,null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
String result = cursor.getString(index);
cursor.close();
return result;
}
} finally {
if (cursor != null)
cursor.close();
}
} else if (DocumentsContract.isDocumentUri(context,uri)) {
// MediaProvider
String wholeID = DocumentsContract.getDocumentId(uri);
// Split at colon,use second item in the array
String[] ids = wholeID.split(":");
String id;
String type;
if (ids.length > 1) {
id = ids[1];
type = ids[0];
} else {
id = ids[0];
type = ids[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[]{id};
final String column = "_data";
final String[] projection = {column};
Cursor cursor = context.getContentResolver().query(contentUri,selection,selectionArgs,null);
if (cursor != null) {
int columnIndex = cursor.getColumnIndex(column);
if (cursor.moveToFirst()) {
filePath = cursor.getString(columnIndex);
}
cursor.close();
}
return filePath;
} else {
String[] proj = {MediaStore.Audio.Media.DATA};
Cursor cursor = context.getContentResolver().query(uri,proj,null);
if (cursor != null) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
if (cursor.moveToFirst())
filePath = cursor.getString(column_index);
cursor.close();
}
return filePath;
}
return null;
}
