Develop Reference

Can not locate the sdcard file(not hard code) in android 6.0

Since android 6.0, the sdcard path is no longer "/storage/sdcard1/", "/storage/sdcard-ext/" or something.
The path depends on the phone instead. If I use Nexus 5x AVD, the path is "/storage/1D15-3A1B/". When I use Nexus 6p AVD, the path is "/storage/4679-1802/". So how can I dynamically write the sdcard path in program to locate the file in external sdcard?
Thank you!

Have a look at getExternalFilesDirs().

It seems that I found the solution.
I'm using the access storage framework. I get it by handling the string of uri and get the "1D15-3A1B" part and then combine it to the sdcard path. Here is the solution.
When I click the file Welcome to Word.docx in the sdcard root path, I get the intent by onActivityResult().
Get the DocumentId by String docId = DocumentsContract.getDocumentId(intent.getData()), thus the string docId is "1D15-3A1B:Welcome to Word.docx".
Split the string and get a string array by String[] split = docId.split(":"), so we can get "1D15-3A1B" which is split[0], and the path in sdcard "Welcome to Word.docx" is split[1].
If we want to get the uri of the file we clicked before, just need to build a new string String newPath = "/storage/" + split[0] + "/" + split[1].
update:
Actually getExternalFilesDirs() is much easier to do this...Thank you #greenapps!

I was trying many approaches, including:
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)
Environment.getExternalStorageDirectory()
Still my picture files in DCIM/Camera were not visible to my app. I could see the directory names, but listFiles() on any of these directories returned null.
Finally, and sheepishly, I found that my Manifest did not contain the magic line android.permission.WRITE_EXTERNAL_STORAGE.
Once I added the permission, it worked like a charm.
Moral of the story: Android does not warn/break/throw exception under this condition. When it fails, it fails silently!

Read file from conten path

I am useing file chooser to choose a simple text file, however problem is that it returns path in
content:/com.android.externalrnalstorage.documents/document/1BF4-1E18%3Astudents.txt
(students.txt is located at sdcard).
I tried all getpath() functions available everywhere on net, but they dont work for me. They either give me /document/1BF4-1E18:students.txt
or the one with kitkat compatiblity gives me content:/com.android.externalstorage.documents/document/1BF4-1E18%3Astudents.txt.
I have really tried, so is there any way I can read file using content:/com.... without any conversions?
Thanks to CommonsWare, I got it working, Here is the snippet.
ContentResolver resolver = getContentResolver();
InputStream in = resolver.openInputStream(uri);
BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));

I have really tried, so is there any way I can read file using content:/com.... without any conversions?
I do not know what "without any conversions" means here. To read in the content from a content:// Uri, use a ContentResolver and openInputStream().

Get fileName from uri on KitKat Document

I want to get fileName from a uri... I can get a fullpath from Other apps like gallery or other third party file managers, but I can't get fileName from KitKat Document, I don't need a fullPath just the fileName with an inputStream is good for me...
Thanks
Edit: I found a piece of code that solves the issue almost, but it can't get filePath of none known types like *.exe *.vcf , ...
Here's the source

If you have the absolute path of file then simpley create the object of file and use getName method
File f = new File(<Full Path of your file>);
This will return file name with extension.
ANd if you do not want extension
then use CommonsI/O libarary
And from that library you can use
String fileNameWithOutExt = FilenameUtils.removeExtension(fileNameWithExt);

Cannot Open Image in assets folder for Android App

Just like the title says, i can't seem to get the images in my assets folder to open up.
public static final String CONTENT_URI = "file:///android:asset/";
Uri tmp = Uri.parse(CONTENT_URI + s);
holder.image.setImageURI(tmp);
I have tried a bunch of different syntax's, and I can't seem to get the asset to be detected. Keep getting resolveUri errors about it not finding the files.
s is a string such as hears.png which is indeed in the assets folder.

This is what you need to get images from asset
yourImageView.setImageBitmap(BitmapFactory.decodeStream(activity.getResources().getAssets().open("whateverResorce.png")));
Regards!

How can I load an image from drawable folder?

I've the file name of an image stored in the drawable? how can I open it? I want to know the path?
the file name is String imageFileName = "image.png"
and I want to have the path string something like file://drawable/image.png

You can open it using openRawResource(). See more at the documentation.
See this post regarding how to construct a uri to raw resource, though as far as I know it is not recommended.

You can access it through its resource ID. See previous answers such as this one:
Select Drawable file path

Here is the code segment showing how you can refer to an image through its resource ID.
Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.pic1);
int pic_width = mBitmap.width();
int pic_height = mBitmap.height();
See here for more detail