我想选择sdcard中存在的文件而不是内部存储并上传服务器,但我无法获得其获取大小的路径。我已经开始使用以下代码选择文件:
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);
要获取文件路径,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类型不是主要时,它不会进入这种情况:
if("primary".equalsIgnoreCase(type)){
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
所以我的问题是它会是什么呢?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this answer的其他部分,但它不起作用,因为System.getenv()
返回 null 表示“ SECONDARY_STORAGE ”和 sdcard 表示“ EXTERNAL_STORAGE ”。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如下:
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??
答案 0 :(得分:9)
在Android设备管理器上花了一些时间后,我找到了解决方案,这里是:
如果doc type id不是primary,那么我使用:
创建路径filePath = "/storage/" + type + "/" + split[1];
编辑:,如果DocumentUri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, 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,
projection, 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, null, 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;
}
答案 1 :(得分:3)
更改您的上传代码。你会有的地方
macro_rules! type_id_of {
($t:ty, $f:ident) => {
{
fn type_of<T: 'static + ?Sized>(_: &T) -> TypeId {
TypeId::of::<T>()
}
let base: $t = unsafe { ::std::mem::uninitialized() };
let result = type_of(&base.$f);
::std::mem::forget(base);
result
}
}
}
fn main() {
println!("{:?} {:?}", TypeId::of::<i64>(), type_id_of!(MyStruct, value));
}
更改为
FileInputStream fis = new FileInputStream(path);
所以直接使用uri。不需要文件路径。
答案 2 :(得分:0)
在您的应用程序上实现FileProvider非常容易。首先,您需要在AndroidManifest.xml中的标签下添加一个FileProvider标签,如下所示: 的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
...
<application
...
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
</application>
</manifest>
然后在res文件夹下的xml文件夹中创建一个provider_paths.xml文件。如果文件夹不存在,可能需要创建文件夹。
RES / XML / provider_paths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>
完成! FileProvider现已声明并可以使用。
最后一步是在MainActivity.java中更改下面的代码行
Uri photoURI = Uri.fromFile(createImageFile());
to
Uri photoURI = FileProvider.getUriForFile(MainActivity.this,
BuildConfig.APPLICATION_ID + ".provider",
createImageFile());
......完成了!您的应用程序现在可以在包括Android Nougat在内的任何Android版本上完美运行。呀!