Ribbit app is frustrating ( I think i am done with Treehouse)

package com.blacsocial.PicOne;

import java.util.List;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseQuery;
import com.parse.ParseRelation;
import com.parse.ParseUser;
import com.parse.SaveCallback;

public class EditFriendsActivity extends ListActivity {

    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;

    public static final String TAG = EditFriendsActivity.class.getSimpleName();

    protected List<ParseUser> mUsers;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_edit_friends);
        // Show the Up button in the action bar.
        setupActionBar();

        getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }

    @Override
    protected void onResume() {
        super.onResume();

        mCurrentUser = ParseUser.getCurrentUser();
        **mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);**

        setProgressBarIndeterminateVisibility(true);

        ParseQuery<ParseUser> query = ParseUser.getQuery();
        query.orderByAscending(ParseConstants.KEY_USERNAME);
        query.setLimit(1000);
        query.findInBackground(new FindCallback<ParseUser>() {
            @Override
            public void done(List<ParseUser> users, ParseException e) {
                setProgressBarIndeterminateVisibility(false);

                if (e == null) {
                    // Success
                    mUsers = users;
                    String[] usernames = new String[mUsers.size()];
                    int i = 0;
                    for(ParseUser user : mUsers) {
                        usernames[i] = user.getUsername();
                        i++;
                    }
                    ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                            EditFriendsActivity.this, 
                            android.R.layout.simple_list_item_checked,
                            usernames);
                    setListAdapter(adapter);

                    addFriendCheckmarks();
                }
                else {
                    Log.e(TAG, e.getMessage());
                    AlertDialog.Builder builder = new AlertDialog.Builder(EditFriendsActivity.this);
                    builder.setMessage(e.getMessage())
                        .setTitle(R.string.error_title)
                        .setPositiveButton(android.R.string.ok, null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            }
        });
    }

    /**
     * Set up the {@link android.app.ActionBar}.
     */
    private void setupActionBar() {

        getActionBar().setDisplayHomeAsUpEnabled(true);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            // This ID represents the Home or Up button. In the case of this
            // activity, the Up button is shown. Use NavUtils to allow users
            // to navigate up one level in the application structure. For
            // more details, see the Navigation pattern on Android Design:
            //
            // http://developer.android.com/design/patterns/navigation.html#up-vs-back
            //
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        if (getListView().isItemChecked(position)) {
            // add the friend
            mFriendsRelation.add(mUsers.get(position));
        }
        else {
            // remove the friend
            mFriendsRelation.remove(mUsers.get(position));
        }

        mCurrentUser.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                if (e != null) {
                    Log.e(TAG, e.getMessage());
                }
            }
        });
    }

    private void addFriendCheckmarks() {
        mFriendsRelation.getQuery().findInBackground(new FindCallback<ParseUser>() {
            @Override
            public void done(List<ParseUser> friends, ParseException e) {
                if (e == null) {
                    // list returned - look for a match
                    for (int i = 0; i < mUsers.size(); i++) {
                        ParseUser user = mUsers.get(i);

                        for (ParseUser friend : friends) {
                            if (friend.getObjectId().equals(user.getObjectId())) {
                                getListView().setItemChecked(i, true);
                            }
                        }
                    }
                }
                else {
                    Log.e(TAG, e.getMessage());
                }
            }
        });
    }
}

package com.blacsocial.PicOne;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.Toast;

import com.parse.ParseAnalytics;
import com.parse.ParseUser;

public class MainActivity extends FragmentActivity implements
        ActionBar.TabListener {

    public static final String TAG = MainActivity.class.getSimpleName();

    public static final int TAKE_PHOTO_REQUEST = 0;
    public static final int TAKE_VIDEO_REQUEST = 1;
    public static final int PICK_PHOTO_REQUEST = 2;
    public static final int PICK_VIDEO_REQUEST = 3;

    public static final int MEDIA_TYPE_IMAGE = 4;
    public static final int MEDIA_TYPE_VIDEO = 5;

    public static final int FILE_SIZE_LIMIT = 1024*1024*10; // 10 MB

    protected Uri mMediaUri;

    protected DialogInterface.OnClickListener mDialogListener = 
            new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            switch(which) {
                case 0: // Take picture
                    Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    mMediaUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
                    if (mMediaUri == null) {
                        // display an error
                        Toast.makeText(MainActivity.this, R.string.error_external_storage,
                                Toast.LENGTH_LONG).show();
                    }
                    else {
                        takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
                        startActivityForResult(takePhotoIntent, TAKE_PHOTO_REQUEST);
                    }
                    break;
                case 1: // Take video
                    Intent videoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
                    mMediaUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
                    if (mMediaUri == null) {
                        // display an error
                        Toast.makeText(MainActivity.this, R.string.error_external_storage,
                                Toast.LENGTH_LONG).show();
                    }
                    else {
                        videoIntent.putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
                        videoIntent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 10);
                        videoIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0); // 0 = lowest res
                        startActivityForResult(videoIntent, TAKE_VIDEO_REQUEST);
                    }
                    break;
                case 2: // Choose picture
                    Intent choosePhotoIntent = new Intent(Intent.ACTION_GET_CONTENT);
                    choosePhotoIntent.setType("image/*");
                    startActivityForResult(choosePhotoIntent, PICK_PHOTO_REQUEST);
                    break;
                case 3: // Choose video
                    Intent chooseVideoIntent = new Intent(Intent.ACTION_GET_CONTENT);
                    chooseVideoIntent.setType("video/*");
                    Toast.makeText(MainActivity.this, R.string.video_file_size_warning, Toast.LENGTH_LONG).show();
                    startActivityForResult(chooseVideoIntent, PICK_VIDEO_REQUEST);
                    break;
            }
        }

        private Uri getOutputMediaFileUri(int mediaType) {
            // To be safe, you should check that the SDCard is mounted
            // using Environment.getExternalStorageState() before doing this.
            if (isExternalStorageAvailable()) {
                // get the URI

                // 1. Get the external storage directory
                String appName = MainActivity.this.getString(R.string.app_name);
                File mediaStorageDir = new File(
                        Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                        appName);

                // 2. Create our subdirectory
                if (! mediaStorageDir.exists()) {
                    if (! mediaStorageDir.mkdirs()) {
                        Log.e(TAG, "Failed to create directory.");
                        return null;
                    }
                }

                // 3. Create a file name
                // 4. Create the file
                File mediaFile;
                Date now = new Date();
                String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(now);

                String path = mediaStorageDir.getPath() + File.separator;
                if (mediaType == MEDIA_TYPE_IMAGE) {
                    mediaFile = new File(path + "IMG_" + timestamp + ".jpg");
                }
                else if (mediaType == MEDIA_TYPE_VIDEO) {
                    mediaFile = new File(path + "VID_" + timestamp + ".mp4");
                }
                else {
                    return null;
                }

                Log.d(TAG, "File: " + Uri.fromFile(mediaFile));

                // 5. Return the file's URI             
                return Uri.fromFile(mediaFile);
            }
            else {
                return null;
            }
        }

        private boolean isExternalStorageAvailable() {
            String state = Environment.getExternalStorageState();

            if (state.equals(Environment.MEDIA_MOUNTED)) {
                return true;
            }
            else {
                return false;
            }
        }
    };

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
     * will keep every loaded fragment in memory. If this becomes too memory
     * intensive, it may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);

        ParseAnalytics.trackAppOpened(getIntent());

        ParseUser currentUser = ParseUser.getCurrentUser();
        if (currentUser == null) {
            navigateToLogin();
        }
        else {
            Log.i(TAG, currentUser.getUsername());
        }

        // Set up the action bar.
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the app.
        mSectionsPagerAdapter = new SectionsPagerAdapter(this, 
                getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections, select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager
                .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                    @Override
                    public void onPageSelected(int position) {
                        actionBar.setSelectedNavigationItem(position);
                    }
                });

        // For each of the sections in the app, add a tab to the action bar.
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(actionBar.newTab()
                    .setText(mSectionsPagerAdapter.getPageTitle(i))
                    .setTabListener(this));
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK) {          
            if (requestCode == PICK_PHOTO_REQUEST || requestCode == PICK_VIDEO_REQUEST) {
                if (data == null) {
                    Toast.makeText(this, getString(R.string.general_error), Toast.LENGTH_LONG).show();
                }
                else {
                    mMediaUri = data.getData();
                }

                Log.i(TAG, "Media URI: " + mMediaUri);
                if (requestCode == PICK_VIDEO_REQUEST) {
                    // make sure the file is less than 10 MB
                    int fileSize = 0;
                    InputStream inputStream = null;

                    try {
                        inputStream = getContentResolver().openInputStream(mMediaUri);
                        fileSize = inputStream.available();
                    }
                    catch (FileNotFoundException e) {
                        Toast.makeText(this, R.string.error_opening_file, Toast.LENGTH_LONG).show();
                        return;
                    }
                    catch (IOException e) {
                        Toast.makeText(this, R.string.error_opening_file, Toast.LENGTH_LONG).show();
                        return;
                    }
                    finally {
                        try {
                            inputStream.close();
                        } catch (IOException e) { /* Intentionally blank */ }
                    }

                    if (fileSize >= FILE_SIZE_LIMIT) {
                        Toast.makeText(this, R.string.error_file_size_too_large, Toast.LENGTH_LONG).show();
                        return;
                    }
                }
            }
            else {
                Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                mediaScanIntent.setData(mMediaUri);
                sendBroadcast(mediaScanIntent);
            }

            Intent recipientsIntent = new Intent(this, RecipientsActivity.class);
            recipientsIntent.setData(mMediaUri);

            String fileType;
            if (requestCode == PICK_PHOTO_REQUEST || requestCode == TAKE_PHOTO_REQUEST) {
                fileType = ParseConstants.TYPE_IMAGE;
            }
            else {
                fileType = ParseConstants.TYPE_VIDEO;
            }

            recipientsIntent.putExtra(ParseConstants.KEY_FILE_TYPE, fileType);
            startActivity(recipientsIntent);
        }
        else if (resultCode != RESULT_CANCELED) {
            Toast.makeText(this, R.string.general_error, Toast.LENGTH_LONG).show();
        }
    }

    private void navigateToLogin() {
        Intent intent = new Intent(this, LoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
        startActivity(intent);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();

        switch(itemId) {
            case R.id.action_logout:
                ParseUser.logOut();
                navigateToLogin();
            case R.id.action_edit_friends:
                Intent intent = new Intent(this, EditFriendsActivity.class);
                startActivity(intent);
            case R.id.action_camera:
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setItems(R.array.camera_choices, mDialogListener);
                AlertDialog dialog = builder.create();
                dialog.show();
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab,
            FragmentTransaction fragmentTransaction) {
        // When the given tab is selected, switch to the corresponding page in
        // the ViewPager.
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab,
            FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab,
            FragmentTransaction fragmentTransaction) {
    }
}

package com.blacsocial.PicOne;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;
import android.widget.ImageView;

import com.squareup.picasso.Picasso;

public class ViewImageActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_image);
        // Show the Up button in the action bar.
        setupActionBar();

        ImageView imageView = (ImageView)findViewById(R.id.imageView);

        Uri imageUri = getIntent().getData();

        Picasso.with(this).load(imageUri.toString()).into(imageView);

        Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                finish();
            }
        }, 10*1000);
    }

    /**
     * Set up the {@link android.app.ActionBar}.
     */
    private void setupActionBar() {

        getActionBar().setDisplayHomeAsUpEnabled(true);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            // This ID represents the Home or Up button. In the case of this
            // activity, the Up button is shown. Use NavUtils to allow users
            // to navigate up one level in the application structure. For
            // more details, see the Navigation pattern on Android Design:
            //
            // http://developer.android.com/design/patterns/navigation.html#up-vs-back
            //
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        ParseObject message = mMessages.get(position);
        String messageType = message.getString(ParseConstants.KEY_FILE_TYPE);
        ParseFile file = message.getParseFile(ParseConstants.KEY_FILE);
        Uri fileUri = Uri.parse(file.getUrl());

        if (messageType.equals(ParseConstants.TYPE_IMAGE)) {
            // view the image
            Intent intent = new Intent(getActivity(), ViewImageActivity.class);
            intent.setData(fileUri);
            startActivity(intent);
        }
        else {
            // view the video
            Intent intent = new Intent(Intent.ACTION_VIEW, fileUri);
            intent.setDataAndType(fileUri, "video/*");
            startActivity(intent);
        }
        //Delete it
        List<String> ids = message.getList(ParseConstants.KEY_RECIPIENT_IDS);

        if(ids.size() == 1 ){
            //last recipient - delete the whole thing
            message.deleteInBackground();           
        }
        else{
            // remove the recipient and save
            ids.remove(ParseUser.getCurrentUser().getObjectId());

            ArrayList<String> idsToRemove = new ArrayList<String>();
            idsToRemove.add(ParseUser.getCurrentUser().getObjectId());

            message.removeAll(ParseConstants.KEY_RECIPIENT_IDS,idsToRemove );
            message.saveInBackground();

        }
    }
}