Social sharing on mobile

Question

On a website, one can use a social sharing javascript library like addthis in order to propose share buttons to the user without having to program everything from scratch.

Answer 1

On Android we have Intents for this. If you like to give the user an opportunity to share something, you can fire up an intent like this for example:

Intent share = new Intent(Intent.ACTION_SEND);
share.setType("image/jpeg") // might be text, sound, whatever
share.putExtra(Intent.EXTRA_STREAM, pathToPicture);
startActivity(Intent.createChooser(share, "share"));

Answer 2

pathToPicture in previous answer is vague. It should be an Uri. See Android docs

More elaborate example:

String path = "/mnt/sdcard/dir1/sample_1.jpg";
Intent share = new Intent(Intent.ACTION_SEND);
    MimeTypeMap map = MimeTypeMap.getSingleton(); //mapping from extension to mimetype
    String ext = path.substring(path.lastIndexOf('.') + 1);
    String mime = map.getMimeTypeFromExtension(ext);
    share.setType(mime); // might be text, sound, whatever
    Uri uri = Uri.fromFile(new File(path));
    share.putExtra(Intent.EXTRA_STREAM,uri);//using a string here didnt work for me
    Log.d(TAG, "share " + uri + " ext:" + ext + " mime:" + mime);
    startActivity(Intent.createChooser(share, "share"));