HomeActivity changes: - added LOGOUT_URL constant with the API endpoint for deleting sessions and logging out users - added menu_logout menu item to the onOptionsItemSelected - added logoutFromAPI() method to be called when user select the logout menu item - added LogoutTask that will send the DELETE HTTP request to the API In the onPostExecute(…

activity_home.xml

// file: res/menu/activity_home.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_new_task"
        android:title="@string/menu_new_task"
        android:orderInCategory="100"
        android:showAsAction="ifRoom" />
    <item android:id="@+id/menu_refresh"
        android:title="@string/menu_refresh"
        android:orderInCategory="100"
        android:showAsAction="ifRoom" />
    <item android:id="@+id/menu_logout"
        android:title="@string/menu_logout"
        android:orderInCategory="100"
        android:showAsAction="ifRoom" />
</menu>

HomeActivity.java

package net.primegap.authexample;

import java.io.IOException;
import java.util.ArrayList;

import org.apache.http.client.HttpResponseException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckedTextView;
import android.widget.ListView;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.savagelook.android.UrlJsonAsyncTask;

public class HomeActivity extends SherlockActivity {

  private static final String TASKS_URL = "http://10.0.2.2:3000/api/v1/tasks.json";
  private static final String TOGGLE_TASKS_URL = "http://10.0.2.2:3000/api/v1/tasks/";
  private static final String LOGOUT_URL = "http://10.0.2.2:3000/api/v1/sessions.json";
  private SharedPreferences mPreferences;
	
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);

    mPreferences = getSharedPreferences("CurrentUser", MODE_PRIVATE);
  }

  @Override
  public void onResume() {
    super.onResume();

    if (mPreferences.contains("AuthToken")) {
  		loadTasksFromAPI(TASKS_URL);
  	} else {
      Intent intent = new Intent(HomeActivity.this, WelcomeActivity.class);
      startActivityForResult(intent, 0);
  	}
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getSupportMenuInflater().inflate(R.menu.activity_home, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
      case R.id.menu_new_task:
      	Intent intent = new Intent(HomeActivity.this, NewTaskActivity.class);
        startActivityForResult(intent, 0);
        return true;
      case R.id.menu_refresh:
      	loadTasksFromAPI(TASKS_URL);
        return true;
      case R.id.menu_logout:
      	logoutFromAPI(LOGOUT_URL);
        return true;
      default:
        return super.onOptionsItemSelected(item);
    }
  }
    
  private void logoutFromAPI(String url) {
    LogoutTask logoutTask = new LogoutTask(HomeActivity.this);
    logoutTask.setMessageLoading("Loggin out...");
    logoutTask.execute(url);
  }

  private void loadTasksFromAPI(String url) {
    GetTasksTask getTasksTask = new GetTasksTask(HomeActivity.this);
    getTasksTask.setMessageLoading("Loading tasks...");
    getTasksTask.setAuthToken(mPreferences.getString("AuthToken", ""));
    getTasksTask.execute(url);
  }

  private void toggleTasksWithAPI(String url) {
    ToggleTaskTask completeTasksTask = new ToggleTaskTask(HomeActivity.this);
    completeTasksTask.setMessageLoading("Updating task...");
    completeTasksTask.execute(url);
  }
  
  private class TaskAdapter extends ArrayAdapter<Task> implements OnClickListener {

    private ArrayList<Task> items;
    private int layoutResourceId; 

    public TaskAdapter(Context context, int layoutResourceId, ArrayList<Task> items) {
    	super(context, layoutResourceId, items);
    	this.layoutResourceId = layoutResourceId;
    	this.items = items;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      View view = convertView;
      if (view == null) {
        LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = (CheckedTextView) layoutInflater.inflate(layoutResourceId, null);
      }
      Task task = items.get(position);
      if (task != null) {
      	CheckedTextView taskCheckedTextView = (CheckedTextView) view.findViewById(android.R.id.text1);
        if (taskCheckedTextView != null) {
        	taskCheckedTextView.setText(task.getTitle());
        	taskCheckedTextView.setChecked(task.getCompleted());
        	taskCheckedTextView.setOnClickListener(this);
        }
        view.setTag(task.getId());
      }
      return view;
    }

		@Override
		public void onClick(View view) {
			CheckedTextView taskCheckedTextView = (CheckedTextView) view.findViewById(android.R.id.text1);
      if (taskCheckedTextView.isChecked()) {
      	taskCheckedTextView.setChecked(false);
      	toggleTasksWithAPI(TOGGLE_TASKS_URL + view.getTag() + "/open.json");
      } else {
        taskCheckedTextView.setChecked(true);
        toggleTasksWithAPI(TOGGLE_TASKS_URL + view.getTag() + "/complete.json");
      }
	  }
  }

  private class GetTasksTask extends UrlJsonAsyncTask {
		public GetTasksTask(Context context) {
			super(context);
		}

		@Override
    protected void onPostExecute(JSONObject json) {
      try {
        JSONArray jsonTasks = json.getJSONObject("data").getJSONArray("tasks");
        JSONObject jsonTask = new JSONObject();
        int length = jsonTasks.length();
        final ArrayList<Task> tasksArray = new ArrayList<Task>(length);

        for (int i = 0; i < length; i++) {
        	jsonTask = jsonTasks.getJSONObject(i);
        	tasksArray.add(new Task(jsonTask.getLong("id"), jsonTask.getString("title"), jsonTask.getBoolean("completed")));
        }
        ListView tasksListView = (ListView) findViewById (R.id.tasks_list_view);
        if (tasksListView != null) {
          tasksListView.setAdapter(new TaskAdapter(HomeActivity.this, 
            android.R.layout.simple_list_item_checked, tasksArray));
    		}
    	} catch (Exception e) {
			  Toast.makeText(context, e.getMessage(), Toast.LENGTH_LONG).show();
      } finally {	
        super.onPostExecute(json);
  		}
    }
  }
    
  private class ToggleTaskTask extends UrlJsonAsyncTask {
    public ToggleTaskTask(Context context) {
      super(context);
    }

		@Override
		protected JSONObject doInBackground(String... urls) {
			DefaultHttpClient client = new DefaultHttpClient();
			HttpPut put = new HttpPut(urls[0]);
			String response = null;
			JSONObject json = new JSONObject();

			try {
				try {
          json.put("success", false);
          json.put("info", "Something went wrong. Retry!");
					put.setHeader("Accept", "application/json");
					put.setHeader("Content-Type", "application/json");
					put.setHeader("Authorization", "Token token=" + mPreferences.getString("AuthToken", ""));

					ResponseHandler<String> responseHandler = new BasicResponseHandler();
					response = client.execute(put, responseHandler);
					json = new JSONObject(response);
					
				} catch (HttpResponseException e) {
					e.printStackTrace();
          Log.e("ClientProtocol", "" + e);
				} catch (IOException e) {
					e.printStackTrace();
          Log.e("IO", "" + e);
				}
			} catch (JSONException e) {
				e.printStackTrace();
        Log.e("JSON", "" + e);
			}
			
			return json;
		}
		
		@Override
    protected void onPostExecute(JSONObject json) {
      try {
        Toast.makeText(context, json.getString("info"), Toast.LENGTH_LONG).show();
      } catch (Exception e) {
				Toast.makeText(context, e.getMessage(), Toast.LENGTH_LONG).show();
			} finally {	
				super.onPostExecute(json);
			}	
		}
  }
    
  private class LogoutTask extends UrlJsonAsyncTask {
		public LogoutTask(Context context) {
			super(context);
		}

		@Override
		protected JSONObject doInBackground(String... urls) {
			DefaultHttpClient client = new DefaultHttpClient();
			HttpDelete delete = new HttpDelete(urls[0]);
			String response = null;
			JSONObject json = new JSONObject();

			try {
				try {
          json.put("success", false);
          json.put("info", "Something went wrong. Retry!");
					delete.setHeader("Accept", "application/json");
					delete.setHeader("Content-Type", "application/json");
					delete.setHeader("Authorization", "Token token=" + mPreferences.getString("AuthToken", ""));

					ResponseHandler<String> responseHandler = new BasicResponseHandler();
					response = client.execute(delete, responseHandler);
					json = new JSONObject(response);
					
				} catch (HttpResponseException e) {
					e.printStackTrace();
          Log.e("ClientProtocol", "" + e);
				} catch (IOException e) {
					e.printStackTrace();
          Log.e("IO", "" + e);
				}
			} catch (JSONException e) {
				e.printStackTrace();
        Log.e("JSON", "" + e);
			}
			
			return json;
		}
		
		@Override
    protected void onPostExecute(JSONObject json) {
    	try {
        if (json.getBoolean("success")) {
          SharedPreferences.Editor editor = mPreferences.edit();
          editor.remove("AuthToken");
          editor.commit();

          Intent intent = new Intent(HomeActivity.this, WelcomeActivity.class);
          startActivityForResult(intent, 0);
        }
        Toast.makeText(context, json.getString("info"), Toast.LENGTH_LONG).show();
      } catch (Exception e) {
        Toast.makeText(context, e.getMessage(), Toast.LENGTH_LONG).show();
		  } finally {	
        super.onPostExecute(json);
      }
    }
  }
}

strings.xml

// file: res/values/strings.xml
<resources>

    <string name="app_name">AuthExample</string>
    <string name="menu_refresh">Refresh</string>
    <string name="menu_new_task">New Task</string>
    <string name="menu_logout">Logout</string>
    <string name="title_activity_home">AuthExample</string>
    <string name="title_activity_welcome">Welcome</string>
    <string name="title_activity_register">Register</string>
    <string name="title_activity_login">Login</string>
    <string name="title_activity_profile">Profile</string>
    <string name="title_activity_new_task">New Task</string>
    <string name="title_activity_preferences">Preferences</string>
    <string name="title_activity_dialog_error">Error</string>
    <string name="register">Register</string>
    <string name="login">Login</string>
    <string name="logout">Logout</string>
    <string name="confirm">Are you sure you want to complete this action?</string>
    <string name="save">Save</string>
    <string name="user_name">Username</string>
    <string name="user_email">Email</string>
    <string name="user_password">Password</string>
    <string name="user_password_confirmation">Confirm Password</string>
    <string name="task_title">Task Title</string>
    <string name="welcome_title">Welcome to the app!</string>
    <string name="welcome_text">Please select an option to start using it!</string>
    <string name="register_disclaimer">Your email address will always remain private. By clicking Register you are indicating that you have read and agree to the Terms of Service.</string>
    <string name="hello_world">Hello world!</string>

</resources>