Android Open Source - Photochat Edit Friends Activity

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package com.navneet.photochat;
//ww  w .  ja  v  a 2s.c  o  m
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
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;

public class EditFriendsActivity extends Activity {

  // Variable Declaration
  protected static final String TAG = EditFriendsActivity.class
      .getSimpleName();
  protected List<ParseUser> mUsers = new ArrayList<ParseUser>();
  protected ParseRelation<ParseUser> mFriendrelation;
  protected ParseUser mCurrentUser;
  // Member variable for the grid view
  protected GridView mUserGridView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    setContentView(R.layout.user_grid);
    // Set the grid view
    mUserGridView = (GridView) findViewById(R.id.friendsGrid);
    // To check or un-check friends
    mUserGridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);
    // Set on item click listener
    mUserGridView.setOnItemClickListener(mOnItemClickListener);
    // set empty text
    TextView emptyTextView = (TextView) findViewById(android.R.id.empty);
    mUserGridView.setEmptyView(emptyTextView);

  }

  @Override
  protected void onResume() {
    super.onResume();
    // To define relationships
    mCurrentUser = ParseUser.getCurrentUser();
    mFriendrelation = mCurrentUser
        .getRelation(ParseConstants.KEY_FRIEND_RELATION);
    // Setting up the progress bar
    setProgressBarIndeterminateVisibility(true);
    ParseQuery<ParseUser> query = ParseUser.getQuery();
    // To order the usernames in ascending order
    query.orderByAscending(ParseConstants.KEY_USERNAME);
    // To set linit of number of queries to avoid crashing of application
    query.setLimit(1000);
    // To search in background
    query.findInBackground(new FindCallback<ParseUser>() {

      @Override
      public void done(List<ParseUser> users, ParseException e) {
        // TODO Auto-generated method stub
        // Make the visibilty of the progress bar false
        setProgressBarIndeterminateVisibility(false);
        if (e == null) {
          // SUccess
          mUsers = users;
          // Declare an array of strings to show the names
          String[] usernames = new String[mUsers.size()];
          // Set a loop to set the different elements of the string
          // array
          int i = 0;
          for (ParseUser user : mUsers) {
            usernames[i] = user.getUsername();
            i++;
          }
          // check whether gridView is empty or not
          if (mUserGridView.getAdapter() == null) {
            // Setting the custom grid adpater to display the
            // results
            UserAdpater adapter = new UserAdpater(
                EditFriendsActivity.this, mUsers);
            mUserGridView.setAdapter(adapter);
          } else {
            // refill the grid view if already created
            ((UserAdpater) mUserGridView.getAdapter())
                .refill(mUsers);
          }

          addFriendCheckMarks();
        } else {
          Log.e(TAG, e.getMessage());

        }

      }
    });

  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  private void addFriendCheckMarks() {
    mFriendrelation.getQuery().findInBackground(
        new FindCallback<ParseUser>() {

          @Override
          public void done(List<ParseUser> friends, ParseException e) {
            if (e == null) {
              // list returned-look for a match
              // Use for loop for searching the entries
              for (int i = 0; i < mUsers.size(); i++) {
                ParseUser user = mUsers.get(i);

                // Searching in the list returned in the done
                // method
                for (ParseUser friend : friends) {
                  // Checking the object id's of friends list
                  // and user list
                  if (friend.getObjectId().equals(
                      user.getObjectId())) {
                    // Set check mark true
                    mUserGridView.setItemChecked(i, true);
                    // Set imageView

                  }
                }
              }
            } else {
              // Exception
              // Logging the exception
              Log.e(TAG, e.getMessage());
            }

          }
        });
  }

  protected OnItemClickListener mOnItemClickListener = new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View view, int position,
        long id) {
      // Take view from the Image View checked
      ImageView checkedImageView = (ImageView) view
          .findViewById(R.id.selectedUserIcon);
      // Actual code to select friends in the backend
      // To check whether the item is clicked or not
      if (mUserGridView.isItemChecked(position)) {
        // add friend
        // getting the position of the user tapped
        mFriendrelation.add(mUsers.get(position));
        // Show checked mark to notify users
        checkedImageView.setVisibility(View.VISIBLE);

      } else { // remove a friend
        mFriendrelation.remove(mUsers.get(position));
        checkedImageView.setVisibility(View.INVISIBLE);

      } // Save in backend
        // For saving in the backend
      mCurrentUser.saveInBackground(new SaveCallback() {

        @Override
        public void done(ParseException e) {
          // If the method fails ,log the exception
          if (e != null) {
            Log.e(TAG, e.getMessage());
          }
        }
      });

    }

  };
}

Java Source Code List

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