Android: 如何通过意图打开一个特定的文件夹并在文件浏览器中显示其内容？

我以为这会很容易，但不幸的是，事实并非如此。

我所拥有的:

我的外部存储器上有一个名为“ myFolder”的文件夹(不是 sd 卡，因为它是 Nexus4，但这应该不是问题)。该文件夹包含一些 *.csv文件。

我想要的:

我想写一个方法，做到以下几点: 显示各种应用程序(文件浏览器) ，我可以从中挑选一个(见图片)。当我点击它，选定的文件浏览器应该启动，并显示我的“ myFolder”的内容。不多不少。

enter image description here

我的问题是:

我到底该怎么做？我认为我已经很接近下面的代码了，但是不管我做什么——我确信肯定有些东西我还没有做对——它总是只打开外部存储的主文件夹。

public void openFolder()
{
File file = new File(Environment.getExternalStorageDirectory(),
"myFolder");


Log.d("path", file.toString());


Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setDataAndType(Uri.fromFile(file), "*/*");
startActivity(intent);
}
146785 次浏览
小开

You seem close.

I would try to set the URI like this : 

String folderPath = Environment.getExternalStorageDirectory()+"/pathTo/folder";


Intent intent = new Intent();
intent.setAction(Intent.ACTION_GET_CONTENT);
Uri myUri = Uri.parse(folderPath);
intent.setDataAndType(myUri , "file/*");
startActivity(intent);

But it's not so different from what you have tried. Tell us if it changes anything ?

Also make sure the targeted folder exists, and have a look on the resulting Uri object before to send it to the intent, it may not be what we are expected.

小开
最佳答案

I finally got it working. This way only a few apps are shown by the chooser (Google Drive, Dropbox, Root Explorer, and Solid Explorer). It's working fine with the two explorers but not with Google Drive and Dropbox (I guess because they cannot access the external storage). The other MIME type like "*/*" is also possible.

public void openFolder(){
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()
+  File.separator + "myFolder" + File.separator);
intent.setDataAndType(uri, "text/csv");
startActivity(Intent.createChooser(intent, "Open folder"));
}
小开

this code will work with OI File Manager :

        File root = new File(Environment.getExternalStorageDirectory().getPath()
+ "/myFolder/");
Uri uri = Uri.fromFile(root);


Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setData(uri);
startActivityForResult(intent, 1);

you can get OI File manager here : http://www.openintents.org/en/filemanager

小开

This should help you:

Uri selectedUri = Uri.parse(Environment.getExternalStorageDirectory() + "/myFolder/");
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(selectedUri, "resource/folder");


if (intent.resolveActivityInfo(getPackageManager(), 0) != null)
{
startActivity(intent);
}
else
{
// if you reach this place, it means there is no any file
// explorer app installed on your device
}

Please, be sure that you have any file explorer app installed on your device.

EDIT: added a shantanu's recommendation from the comment.

LIBRARIES: You can also have a look at the following libraries https://android-arsenal.com/tag/35 if the current solution doesn't help you.

小开 
File temp = File.createTempFile("preview", ".png" );
String fullfileName= temp.getAbsolutePath();
final String fileName = Uri.parse(fullfileName)
.getLastPathSegment();
final String filePath = fullfileName.
substring(0,fullfileName.lastIndexOf(File.separator));
Log.d("filePath", "filePath: " + filePath);

fullfileName:

/mnt/sdcard/Download_Manager_Farsi/preview.png

filePath:

/mnt/sdcard/Download_Manager_Farsi

小开 
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);


intent.setType("text/csv");


intent.addCategory(Intent.CATEGORY_OPENABLE);


try {
startActivityForResult(Intent.createChooser(intent, "Select a File to Upload"), 0);


} catch (android.content.ActivityNotFoundException ex) {
ex.printStackTrace();
}

then you just need to add the response

public void  onActivityResult(int requestCode, int resultCode, Intent data){


switch (requestCode) {
case 0: {
//what you want to do
//file = new File(uri.getPath());
}
}
}
小开 
Intent chooser = new Intent(Intent.ACTION_GET_CONTENT);
Uri uri = Uri.parse(Environment.getDownloadCacheDirectory().getPath().toString());
chooser.addCategory(Intent.CATEGORY_OPENABLE);
chooser.setDataAndType(uri, "*/*");
// startActivity(chooser);
try {
startActivityForResult(chooser, SELECT_FILE);
}
catch (android.content.ActivityNotFoundException ex)
{
Toast.makeText(this, "Please install a File Manager.",
Toast.LENGTH_SHORT).show();
}

In code above, if setDataAndType is "*/*" a builtin file browser is opened to pick any file, if I set "text/plain" Dropbox is opened. I have Dropbox, Google Drive installed. If I uninstall Dropbox only "*/*" works to open file browser. This is Android 4.4.2. I can download contents from Dropbox and for Google Drive, by getContentResolver().openInputStream(data.getData()).

小开

Today, you should be representing a folder using its content: URI as obtained from the Storage Access Framework, and opening it should be as simple as:

Intent i = new Intent(Intent.ACTION_VIEW, uri);
startActivity(i);
小开 
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, DocumentsContract.Document.MIME_TYPE_DIR);
startActivity(intent);

Will open files app home screen enter image description here

小开

Thread is old but I needed this kind of feature in my application and I found a way to do it so I decided to post it if it can help anyone in my situation.

As our device fleet is composed only by Samsung Galaxy Tab 2, I just had to find the file explorer's package name, give the right path and I succeed open my file explorer where I wanted to. I wish I could use Intent.CATEGORY_APP_FILES but it is only available in API 29.

  Intent intent = context.getPackageManager().getLaunchIntentForPackage("com.sec.android.app.myfiles");
Uri uri = Uri.parse(rootPath);
if (intent != null) {
intent.setData(uri);
startActivity(intent);
}

As I said, it was easy for me because our clients have the same device but it may help others to find a workaround for their own situation.

小开

Here is my answer

private fun openFolder() {
val location = "/storage/emulated/0/Download/";
val intent = Intent(Intent.ACTION_VIEW)
val myDir: Uri = FileProvider.getUriForFile(context, context.applicationContext.packageName + ".provider", File(location))
intent.flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
intent.setDataAndType(myDir,  DocumentsContract.Document.MIME_TYPE_DIR)
else  intent.setDataAndType(myDir,  "*/*")


if (intent.resolveActivityInfo(context.packageManager, 0) != null)
{
context.startActivity(intent)
}
else
{
// if you reach this place, it means there is no any file
// explorer app installed on your device
CustomToast.toastIt(context,context.getString(R.string.there_is_no_file_explorer_app_present_text))
}
}

Here why I used FileProvider - android.os.FileUriExposedException: file:///storage/emulated/0/test.txt exposed beyond app through Intent.getData()

I tested on this device
Devices: Samsung SM-G950F (dreamltexx), Os API Level: 28


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