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//in Manifest <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

public class UserListActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_list);

        final ListView listView = (ListView) findViewById(R.id.listView);
        final ArrayList<String> userNames = new ArrayList<>();
        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, userNames);


        //DISPLAY A LIST OF USERS IN LISTVIEW
        ParseQuery<ParseUser> query = ParseUser.getQuery();
        query.whereNotEqualTo("username", ParseUser.getCurrentUser().getUsername()); //dont want to see our name in the list
        query.addAscendingOrder("username");
        query.findInBackground(new FindCallback<ParseUser>() {
            @Override
            public void done(List<ParseUser> objects, ParseException e) {
                if (e == null) {
                    if (objects.size() > 0) {
                        for (ParseUser user : objects) {
                            userNames.add(user.getUsername());
                        }
                        listView.setAdapter(arrayAdapter); //note where we set the arrayAdapter
                    }
                } else {
                    e.printStackTrace();
                }
            }
        });
    }

    //MENU
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.share_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @TargetApi(Build.VERSION_CODES.M)
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.share) {
            if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
            } else {
                getPhoto();
            }
        }
        return super.onOptionsItemSelected(item);
    }

    //PERMISSION
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == 1) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                getPhoto();
            }
        }
    }

    //GETPHOTO VIA INTENT
    public void getPhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, 1);
    }

    //SAVE IMAGE TO PARSE
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        Uri selectedImage = data.getData();
        if (requestCode == 1 && resultCode == RESULT_OK && data != null) {
            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImage);
                //Log.i("image selected", "got image");

                //uploading image to Parse
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                byte[] byteArray = stream.toByteArray();
                ParseFile file = new ParseFile("image.png", byteArray);
                ParseObject object = new ParseObject("Image");
                object.put("image", file);
                object.put("username", ParseUser.getCurrentUser().getUsername());
                object.saveInBackground(new SaveCallback() {
                    @Override
                    public void done(ParseException e) {
                        if (e == null) {
                            Toast.makeText(UserListActivity.this, "Image shared!", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(UserListActivity.this, "There has been an issue uploading image :(", Toast.LENGTH_SHORT).show();
                        }
                    }
                });

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}