AddFriend.java

package theintelligentminds.messenger;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.SearchView;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

import at.intelligentminds.client.ConnectionProvider;
import at.intelligentminds.client.User;


public class AddFriend extends ActionBarActivity {
    private ListView addFriendsListView;
    private ConnectionProvider provider = ConnectionProvider.getInstance();
    private ArrayList<User> newFriendList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_friend);

        addFriendsListView = (ListView) findViewById(R.id.addFriendsListView);

        addFriendsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                User user = newFriendList.get(i);
                AsyncDBAccessAddFriend asyncAddFriend = new AsyncDBAccessAddFriend();
                asyncAddFriend.execute(user);
            }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_add_friend, menu);
        MenuItem searchItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);

        SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String s) {
                return true;
            }

            @Override
            public boolean onQueryTextChange(String s) {
                AsyncDBAccessSearchFriends asyncSearchFriends = new AsyncDBAccessSearchFriends();
                asyncSearchFriends.execute(s);
                return true;
            }
        };

        searchView.setOnQueryTextListener(queryTextListener);

        return super.onCreateOptionsMenu(menu);
    }

    @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.
        Intent intent = null;

        switch(item.getItemId())
        {
            case R.id.options:
                intent = new Intent(AddFriend.this, Options.class);
                break;
            default:
                intent = null;
        }

        startActivity(intent);

        return super.onOptionsItemSelected(item);
    }

    class AsyncDBAccessSearchFriends extends AsyncTask<String, Void, ArrayList<User>> {
        @Override
        protected ArrayList<User> doInBackground(String... strings) {
            newFriendList = provider.searchAccounts(strings[0]);
            return newFriendList;
        }

        @Override
        protected void onPostExecute(ArrayList<User> newFriends) {
            super.onPostExecute(newFriends);

            ArrayAdapter<User> listViewAdapter = new ArrayAdapter<User>(AddFriend.this, R.layout.friend_view_row, newFriends);
            addFriendsListView.setAdapter(listViewAdapter);
        }
    }

    class AsyncDBAccessAddFriend extends AsyncTask<User, Void, Boolean> {
        @Override
        protected Boolean doInBackground(User... users) {
            boolean successful_added = provider.addContact(users[0].getEmail());
            return successful_added;
        }

        @Override
        protected void onPostExecute(Boolean successful_added) {
            super.onPostExecute(successful_added);

            if (successful_added) {
                new AlertDialog.Builder(AddFriend.this).setTitle("Add friend").setMessage("Add friend successful")
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                Intent intent = new Intent(AddFriend.this, FriendView.class);
                                startActivity(intent);
                            }
                        }).show();
            }
            else {
                new AlertDialog.Builder(AddFriend.this).setTitle("Add friend").setMessage("Add friend failed")
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {

                            }
                        }).show();
            }
        }
    }
}