Android Open Source - android-ribbit-design Recipients 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 .  co m
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
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.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseInstallation;
import com.parse.ParseObject;
import com.parse.ParsePush;
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.FileHelper;
import com.teamtreehouse.ribbit.utils.ParseConstants;

public class RecipientsActivity extends Activity {

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

  protected ParseRelation<ParseUser> mFriendsRelation;
  protected ParseUser mCurrentUser;  
  protected List<ParseUser> mFriends;  
  protected MenuItem mSendMenuItem;
  protected Uri mMediaUri;
  protected String mFileType;
  protected GridView mGridView;

  @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(ListView.CHOICE_MODE_MULTIPLE);
    mGridView.setOnItemClickListener(mOnItemClickListener);

    TextView emptyTextView = (TextView)findViewById(android.R.id.empty);
    mGridView.setEmptyView(emptyTextView);
    
    mMediaUri = getIntent().getData();
    mFileType = getIntent().getExtras().getString(ParseConstants.KEY_FILE_TYPE);
  }
  
  @Override
  public void onResume() {
    super.onResume();
    
    mCurrentUser = ParseUser.getCurrentUser();
    mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIENDS_RELATION);
    
    setProgressBarIndeterminateVisibility(true);
    
    ParseQuery<ParseUser> query = mFriendsRelation.getQuery();
    query.addAscendingOrder(ParseConstants.KEY_USERNAME);
    query.findInBackground(new FindCallback<ParseUser>() {
      @Override
      public void done(List<ParseUser> friends, ParseException e) {
        setProgressBarIndeterminateVisibility(false);
        
        if (e == null) {
          mFriends = friends;
          
          String[] usernames = new String[mFriends.size()];
          int i = 0;
          for(ParseUser user : mFriends) {
            usernames[i] = user.getUsername();
            i++;
          }

          if (mGridView.getAdapter() == null) {
            UserAdapter adapter = new UserAdapter(RecipientsActivity.this, mFriends);
            mGridView.setAdapter(adapter);
          }
          else {
            ((UserAdapter)mGridView.getAdapter()).refill(mFriends);
          }
        }
        else {
          Log.e(TAG, e.getMessage());
          AlertDialog.Builder builder = new AlertDialog.Builder(RecipientsActivity.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 onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.recipients, menu);
    mSendMenuItem = menu.getItem(0);
    return 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;
    case R.id.action_send:
      ParseObject message = createMessage();
      if (message == null) {
        // error
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage(R.string.error_selecting_file)
          .setTitle(R.string.error_selecting_file_title)
          .setPositiveButton(android.R.string.ok, null);
        AlertDialog dialog = builder.create();
        dialog.show();
      }
      else {
        send(message);
        finish();
      }
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  protected ParseObject createMessage() {
    ParseObject message = new ParseObject(ParseConstants.CLASS_MESSAGES);
    message.put(ParseConstants.KEY_SENDER_ID, ParseUser.getCurrentUser().getObjectId());
    message.put(ParseConstants.KEY_SENDER_NAME, ParseUser.getCurrentUser().getUsername());
    message.put(ParseConstants.KEY_RECIPIENT_IDS, getRecipientIds());
    message.put(ParseConstants.KEY_FILE_TYPE, mFileType);
    
    byte[] fileBytes = FileHelper.getByteArrayFromFile(this, mMediaUri);
    
    if (fileBytes == null) {
      return null;
    }
    else {
      if (mFileType.equals(ParseConstants.TYPE_IMAGE)) {
        fileBytes = FileHelper.reduceImageForUpload(fileBytes);
      }
      
      String fileName = FileHelper.getFileName(this, mMediaUri, mFileType);
      ParseFile file = new ParseFile(fileName, fileBytes);
      message.put(ParseConstants.KEY_FILE, file);

      return message;
    }
  }
  
  protected ArrayList<String> getRecipientIds() {
    ArrayList<String> recipientIds = new ArrayList<String>();
    for (int i = 0; i < mGridView.getCount(); i++) {
      if (mGridView.isItemChecked(i)) {
        recipientIds.add(mFriends.get(i).getObjectId());
      }
    }
    return recipientIds;
  }
  
  protected void send(ParseObject message) {
    message.saveInBackground(new SaveCallback() {
      @Override
      public void done(ParseException e) {
        if (e == null) {
          // success!
          Toast.makeText(RecipientsActivity.this, R.string.success_message, Toast.LENGTH_LONG).show();
          sendPushNotifications();
        }
        else {
          AlertDialog.Builder builder = new AlertDialog.Builder(RecipientsActivity.this);
          builder.setMessage(R.string.error_sending_message)
            .setTitle(R.string.error_selecting_file_title)
            .setPositiveButton(android.R.string.ok, null);
          AlertDialog dialog = builder.create();
          dialog.show();
        }
      }
    });
  }
  
  protected OnItemClickListener mOnItemClickListener = new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
      if (mGridView.getCheckedItemCount() > 0) {
        mSendMenuItem.setVisible(true);
      }
      else {
        mSendMenuItem.setVisible(false);
      }
      
      ImageView checkImageView = (ImageView)view.findViewById(R.id.checkImageView);

      if (mGridView.isItemChecked(position)) {
        // add the recipient
        checkImageView.setVisibility(View.VISIBLE);
      }
      else {
        // remove the recipient
        checkImageView.setVisibility(View.INVISIBLE);
      }
    }
  };
  
  protected void sendPushNotifications() {
    ParseQuery<ParseInstallation> query = ParseInstallation.getQuery();
    query.whereContainedIn(ParseConstants.KEY_USER_ID, getRecipientIds());
    
    // send push notification
    ParsePush push = new ParsePush();
    push.setQuery(query);
    push.setMessage(getString(R.string.push_message, 
        ParseUser.getCurrentUser().getUsername()));
    push.sendInBackground();
  }
}
Java Source Code List
