share file over bluetooth opp in Android N

Question

What i am trying is to share a file over bluetooth. I have tried below two methods to pass the file name to the ACTION_SEND intend. share activity is pop'ing up and when i touch the connected bluetooth device, i get a toast saying Bluetooth share: File Unknown file not sent. Both the method fails.

public void pushFileOverOpp(String filename) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_SEND);
    intent.setPackage("com.android.bluetooth");
    intent.setType("audio/mp3");
    File f = new File(Environment.getExternalStorageDirectory(), "images");
    File sample = new File(f, "sample.mp3");
    Uri u = Uri.parse(sample.toString());
    intent.putExtra(Intent.EXTRA_STREAM, u);
    mContext.startActivity(intent);
}

Error , Log-

OppService: URI : /storage/emulated/0/images/sample.mp3 OppService: HINT : null OppService: FILENAME: null OppService: MIMETYPE: audio/mp3

File f = new File(mContext.getFilesDir(), "images");
File sample = new File(f, "sample.mp3");
Uri u = FileProvider.getUriForFile(mContext,
           BuildConfig.APPLICATION_ID + ".provider", sample);
intent.putExtra(Intent.EXTRA_STREAM, u);

Error, Log-

OppService: URI : content://com.example.com.test.provider/tester/images/sample.mp3 OppService: HINT : null OppService: FILENAME: null

I have checked the android source code, This error comes when filename is null. Log also says filename is null. But i could not figure out the exact reason. Could someone Please help me out here, what is wrong with my code.

Answer 1

After some study i understood the problem. There were two issues-

xml tag for external storage(/sdcard/) directory was wrong in xml file.

I changed as below.

    <root-path
    name="root"
    path="/" />

URI permission was not granted

mContext.grantUriPermission("com.android.bluetooth", u,
            Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION); 

After modifying with above lines of code, File share is working !

full working code-

public boolean pushFileOverOpp(String filename) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_SEND);
    intent.setType("*/*"); // supports all mime types
    intent.setPackage("com.android.bluetooth"); //bluetooth package name, default opp

    File folder = new File(Environment.getExternalStorageDirectory(), "images");
    File file = new File(folder, filename);
    if (!file.exists()) {
        Logger.e("No such file " + filename + " exists!");
        return false;
    }
    Uri u = FileProvider.getUriForFile(mContext, mContext.getPackageName() + ".provider", file);
    intent.putExtra(Intent.EXTRA_STREAM, u);

    mContext.grantUriPermission("com.android.bluetooth", u,
            Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);

    Logger.d("Sharing file over bluetooth " + folder.toString());
    mContext.startActivity(intent);
    return true;
}

Thanks.