Filechooser选择从GMail下载的Word文件时崩溃的应用程序 [英] Filechooser selecting a word file downloaded from GMail crashes app
问题描述
我正在使用文件选择器来选择从GMail下载的WORD文件，这会导致应用程序崩溃.这是我的代码段:
I am using a file chooser to pick a WORD file downloaded from GMail, it causes the app crashed.Here's my code segment:
==文件选择器代码==
== file chooser code ==
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.putExtra(Intent.EXTRA_LOCAL_ONLY, true);
intent.addCategory(Intent.CATEGORY_OPENABLE);
//sets the select file to all types of files
String [] mimeTypes = {"application/pdf", "application/msword",
"application/vnd.openxmlformats
officedocument.wordprocessingml.document"};
intent.setType("*/*");
intent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
intent.putExtra("android.content.extra.SHOW_ADVANCED", true);
activity.startActivityForResult(Intent.createChooser(intent, "Select
File"), PICK_FILE_REQUEST);
== onActivityResult ==
== onActivityResult ==
Uri selectedFileUri = data.getData();
String selectedFilePath = FilePath.getPath(getActivity(),
selectedFileUri);
== FilePath.getPath()==
== FilePath.getPath() ==
...
// DownloadsProvider
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);
== getDataColumn()==
== getDataColumn() ==
public 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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
selectedFilePath 具有以下值:content://com.android.providers.downloads.documents/document/164，FilePath.getPath()中的 contentUri 有这个价值.当它进入getDataColumn()方法时，执行"query()"后光标为空.
The selectedFilePath has this value: content://com.android.providers.downloads.documents/document/164, the contentUri in FilePath.getPath() also has this value. When it goes in getDataColumn() method, the cursor is null after executing "query()".
尝试了以下方法:1)如果我将相同的WORD文件直接放入下载"文件夹，然后从文件选择器的下载"链接中选择它，则没有问题.似乎以某种方式通过GMail并从GMail下载会导致问题. 2)仍从GMail和下载"文件夹中下载的文件，如果我通过内部存储"->下载"(即绝对路径)进行选择，则该代码可以正常工作，因为代码经过了不同的流程(上面未显示).
Tried those: 1) If I put the same WORD file direct to the "Download" folder and pick it from "Downloads" link from the file chooser, I have no issue. It seems that somehow going through GMail and downloading from GMail causes problem. 2) File still downloaded from GMail and in Download folder, if I pick it through Internal storage->Download (i.e, absolute path), it works since the code goes through different flow (which is not shown above).
我想知道我在代码中错过了处理从GMail下载的文件的地方吗?
I am wondering where I missed in the code to handle the file downloaded from GMail?
提前谢谢！
电话是Galaxy S9，Android 9.
The Phone is Galaxy S9, android 9.
推荐答案
经过一些搜索和实验后，最终从InputStream检索文件名和内容，而不是尝试获取文件的路径.这是代码段:
After some search and experiment, it ends up retrieving file name and content from InputStream instead of trying to get the path of the file. Here's the code segment:
1)获取文件详细信息:
1) get file details:
Uri selectedFileUri = data.getData();
FileDetail fileDetail = FilePath.getFileDetailFromUri(getActivity(), selectedFileUri);
String fileName = fileDetail.getFileName();
int fileSize = (int)fileDetail.getFileSize();
这是FileDetail.java:
Here's the FileDetail.java:
public class FileDetail {
// fileSize.
public String fileName;
// fileSize in bytes.
public long fileSize;
public FileDetail() {
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public long getFileSize() {
return fileSize;
}
public void setFileSize(long fileSize) {
this.fileSize = fileSize;
}
}
在FilePath.java中:
In FilePath.java:
public static FileDetail getFileDetailFromUri(Context context, Uri uri) {
FileDetail fileDetail = null;
if (uri != null) {
fileDetail = new FileDetail();
// File Scheme.
if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) {
File file = new File(uri.getPath());
fileDetail.setFileName(file.getName());
fileDetail.setFileSize(file.length());
}
// Content Scheme.
else if (ContentResolver.SCHEME_CONTENT.equals(uri.getScheme())) {
Cursor returnCursor =
context.getContentResolver().query(uri, null, null, null, null);
if (returnCursor != null && returnCursor.moveToFirst()) {
int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
fileDetail.setFileName(returnCursor.getString(nameIndex));
fileDetail.setFileSize(returnCursor.getLong(sizeIndex));
returnCursor.close();
}
}
}
return fileDetail;
}
2)获取文件内容:
InputStream is = cr.openInputStream(selectedFileUri);
byte[] fileContent = new byte[fileSize];
is.read(fileContent);
我从互联网上找到了这些代码，但没有跟踪它们的位置.使用文件名& FileDetail.java中的filesize和"filecontent"字节数组中的文件内容，我现在拥有所有需要的信息.
I found those codes from internet and didn't keep track of where they are. With Filename & filesize in FileDetail.java and the file content in "filecontent" byte arrays, I have all information I need now.
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