Android Open Source - Photochat Recipients 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;
/*  w ww. j a v a  2  s.c om*/
//Activity for selecting recipients for sending photos and videos

import java.util.ArrayList;
import java.util.List;

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

public class RecipientsActivity extends Activity {

  // Member Variable Declaration
  public static final String TAG = FriendsFragment.class.getSimpleName();
  protected List<ParseUser> mFriends;
  protected ParseRelation<ParseUser> mFriendrelation;
  protected ParseUser mCurrentUser;
  protected MenuItem mMenuSend;
  protected Uri mMediaUri;
  protected String mFileType;
  // Declaring a grid view member variable
  protected GridView mGridView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Request window feature comes before setContentView
    requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    setContentView(R.layout.user_grid);
    // Set visibility of the send button to true once there is a friend
    // selected
    // initialize the grid view
    mGridView = (GridView) findViewById(R.id.friendsGrid);

    // For setting the checking functionality on
    mGridView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    // set empty text
    TextView emptyTextView = (TextView) findViewById(android.R.id.empty);
    mGridView.setEmptyView(emptyTextView);
    // Set on item click listener
    mGridView.setOnItemClickListener(mOnItemClickListener);
    // Get the Uri data being passed into this intent
    mMediaUri = getIntent().getData();
    // WE call getExtras as we put fileType as an extra into the
    // recipientsintent
    // getExtras returns a bundle.
    // We just require the fileType string hence we use getString
    mFileType = getIntent().getExtras().getString(
        ParseConstants.KEY_FILE_TYPE);
  }

  // Setting the onResume activity
  public void onResume() {
    super.onResume();
    // To define relationships
    mCurrentUser = ParseUser.getCurrentUser();
    mFriendrelation = mCurrentUser
        .getRelation(ParseConstants.KEY_FRIEND_RELATION);
    setProgressBarIndeterminateVisibility(true);
    // Declaring variable
    ParseQuery<ParseUser> query = mFriendrelation.getQuery();
    // Arrange in ascending order
    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()];
          // Set a loop to set the different elements of the
          // string
          // array
          int i = 0;
          for (ParseUser user : mFriends) {
            usernames[i] = user.getUsername();
            i++;
          }
          // Showing the grid view
          // check whether gridView is empty or not
          if (mGridView.getAdapter() == null) {
            // Setting the custom grid adpater to display the
            // results
            UserAdpater adapter = new UserAdpater(
                RecipientsActivity.this, mFriends);
            mGridView.setAdapter(adapter);
          } else {
            // refill the grid view if already created
            ((UserAdpater) mGridView.getAdapter()).refill(mFriends);
          }

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

        }
      }

    });
  }

  @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);
    // Set the send item in the menu to the MenuItem member variable
    mMenuSend = menu.getItem(0);// since there is only one item
    return true;
  }

  @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;
    } else if (id == R.id.action_send) {
      // Upload the photo or video on the parse backend
      ParseObject message = createMessage();
      // check whether message is null or not
      if (message != null) {
        send(message);
        // Finish recipients activity to go back to Main Activity
        finish();
      } else {
        // error
        Toast.makeText(this, "Error with the file selected",
            Toast.LENGTH_LONG).show();
      }
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  // Method to create the Parse Object message
  protected ParseObject createMessage() {
    ParseObject message = new ParseObject(ParseConstants.CLASS_MESSAGES);
    // Put the sender id
    message.put(ParseConstants.KEY_SENDER_ID, ParseUser.getCurrentUser()
        .getObjectId());
    // Put the sender name
    message.put(ParseConstants.KEY_SENDER_NAME, ParseUser.getCurrentUser()
        .getUsername());
    // Put the recipients ids
    message.put(ParseConstants.KEY_RECIPIENTS_IDS, getRecipientsIds());
    // Put the file type
    message.put(ParseConstants.KEY_FILE_TYPE, mFileType);
    // Create a byte Array variable for ParseFile creation
    byte[] fileBytes;
    // Now we'll use code from github
    fileBytes = FileHelper.getByteArrayFromFile(this, mMediaUri);
    // Check for any errors
    if (fileBytes == null) {
      // Error
      return null;
    } else {
      // Success
      // Check for file type
      if (mFileType.equals(ParseConstants.TYPE_IMAGE)) {
        // Reduce the size of the image to less than 10MB
        fileBytes = FileHelper.reduceImageForUpload(fileBytes);

      }
      String filename = FileHelper
          .getFileName(this, mMediaUri, mFileType);
      // Create parse file
      ParseFile file = new ParseFile(filename, fileBytes);
      // Attach this parse file to parse object message
      message.put(ParseConstants.KEY_FILE, file);
      return message;
    }

  }

  // Use arraylist as its preferred by parse to denote a collection of objects
  protected ArrayList<String> getRecipientsIds() {
    ArrayList<String> recipientsIds = new ArrayList<String>();
    // Loop to checked everyone who is checked
    for (int i = 0; i < mGridView.getCount(); i++) {
      if (mGridView.isItemChecked(i)) {
        // Add to recipientsIds
        // get the object id of the user at current position i
        recipientsIds.add(mFriends.get(i).getObjectId());
      }
    }
    return recipientsIds;

  }

  // Send message method
  // Sending message means saving it to the parse bak-end
  protected void send(ParseObject message) {
    message.saveInBackground(new SaveCallback() {

      @Override
      public void done(ParseException e) {
        if (e == null) {
          // success
          // Show success message to user
          Toast.makeText(RecipientsActivity.this, "Message sent",
              Toast.LENGTH_LONG).show();
          // Send Push Notification
          sendPushNotification();
        } else {
          // Show the user the error message
          Toast.makeText(RecipientsActivity.this,
              "Error sending message", Toast.LENGTH_LONG).show();
        }
      }
    });

  }

  protected OnItemClickListener mOnItemClickListener = new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View view, int position,
        long id) {
      // Set the send button visible if items are checked
      if (mGridView.getCheckedItemCount() > 0) {
        mMenuSend.setVisible(true);
      } else {
        mMenuSend.setVisible(false);
      }
      ImageView checkedImageView = (ImageView) view
          .findViewById(R.id.selectedUserIcon);
      // To check whether the item is clicked or not
      if (mGridView.isItemChecked(position)) {
        // add recipient
        // getting the position of the user tapped
        // Show checked mark to notify users
        checkedImageView.setVisibility(View.VISIBLE);

      } else { // remove a recipient

        checkedImageView.setVisibility(View.INVISIBLE);

      }

    }
  };

  protected void sendPushNotification() {
    // Declare a Parse Query
    // Use this query to find out who should be notified
    ParseQuery<ParseInstallation> query = ParseInstallation.getQuery();
    // For the collection we require the recipient ids
    query.whereContainedIn(ParseConstants.KEY_USER_ID, getRecipientsIds());
    // We have to store the user's id in the ParseInstallation Object
    // We will do this in the done method of our login and signup activities
    // Send Push Notification
    ParsePush push = new ParsePush();
    push.setQuery(query);
    push.setMessage(getString(R.string.push_message, ParseUser
        .getCurrentUser().getUsername()));
    push.sendInBackground();

  }
}

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