Android Open Source - android-ribbit-design Edit Friends Activity

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License

The source code is released under:
MIT License
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Java Source Code

package com.teamtreehouse.ribbit.ui;
/* w w  w. j a va 2 s  . c o  m*/
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
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.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseQuery;
import com.parse.ParseRelation;
import com.parse.ParseUser;
import com.parse.SaveCallback;
import com.teamtreehouse.ribbit.R;
import com.teamtreehouse.ribbit.adapters.UserAdapter;
import com.teamtreehouse.ribbit.utils.ParseConstants;

public class EditFriendsActivity extends Activity {
  
  protected ParseRelation<ParseUser> mFriendsRelation;
  protected ParseUser mCurrentUser;
  protected GridView mGridView;
  
  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.user_grid);
    // Show the Up button in the action bar.
    setupActionBar();
    
    mGridView = (GridView)findViewById(R.id.friendsGrid);
    mGridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);
    mGridView.setOnItemClickListener(mOnItemClickListener);
    
    TextView emptyTextView = (TextView)findViewById(android.R.id.empty);
    mGridView.setEmptyView(emptyTextView);
  }
  
  @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++;
          }
          if (mGridView.getAdapter() == null) {
            UserAdapter adapter = new UserAdapter(EditFriendsActivity.this, mUsers);
            mGridView.setAdapter(adapter);
          }
          else {
            ((UserAdapter)mGridView.getAdapter()).refill(mUsers);
          }
          
          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);
  }

  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())) {
                mGridView.setItemChecked(i, true);
              }
            }
          }
        }
        else {
          Log.e(TAG, e.getMessage());
        }
      }
    });
  }
  
  protected OnItemClickListener mOnItemClickListener = new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
      ImageView checkImageView = (ImageView)view.findViewById(R.id.checkImageView);
      
      if (mGridView.isItemChecked(position)) {
        // add the friend
        mFriendsRelation.add(mUsers.get(position));
        checkImageView.setVisibility(View.VISIBLE);
      }
      else {
        // remove the friend
        mFriendsRelation.remove(mUsers.get(position));
        checkImageView.setVisibility(View.INVISIBLE);
      }
  
      mCurrentUser.saveInBackground(new SaveCallback() {
        @Override
        public void done(ParseException e) {
          if (e != null) {
            Log.e(TAG, e.getMessage());
          }
        }
      });
      
    }
  };
}
Java Source Code List
