ProjectBrowserActivity.java

package org.greengin.sciencetoolkit.common.ui.remote;

import java.util.Vector;

import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpRequestBase;
import org.greengin.sciencetoolkit.common.R;
import org.greengin.sciencetoolkit.common.logic.remote.RemoteApi;
import org.greengin.sciencetoolkit.common.logic.remote.RemoteJsonAction;
import org.greengin.sciencetoolkit.common.ui.base.AppSettingsActivity;
import org.greengin.sciencetoolkit.common.ui.base.RemoteCapableActivity;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.content.BroadcastReceiver;

public abstract class ProjectBrowserActivity extends RemoteCapableActivity
        implements ProjectMembershipListener {

    public static final String REMOTE_PROJECT_DATA_EVENT_FILTER = "REMOTE_PROJECT_DATA_EVENT_FILTER";

    String projectType;

    ProjectBrowserListAdapter adapter;
    BroadcastReceiver loginEventReceiver;
    BroadcastReceiver projectsEventReceiver;

    TextView status;
    Button loginToggle;
    ListView list;

    public ProjectBrowserActivity(String projectType) {
        super();
        this.projectType = projectType;
    }

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

        loginEventReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                updateView();
                if (RemoteApi.get().isLogged()) {
                    remoteRequest(new ProjectMembershipAction());
                }
            }
        };
        projectsEventReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                adapter.notifyDataSetChanged();
            }
        };

        adapter = new ProjectBrowserListAdapter(this, LayoutInflater.from(this));

        status = (TextView) findViewById(R.id.login_status);
        loginToggle = (Button) findViewById(R.id.login_toggle);
        list = (ListView) findViewById(R.id.project_list);

        list.setAdapter(adapter);

        loginToggle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (RemoteApi.get().isLogged()) {
                    RemoteApi.get().logout();
                } else {
                    RemoteApi.get().tryToLogin(ProjectBrowserActivity.this);
                }
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.project_browser, menu);
        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) {
            Intent intent = new Intent(getApplicationContext(), AppSettingsActivity.class);
            startActivity(intent);
            return true;
        } else if (id == R.id.action_application_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

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

        LocalBroadcastManager.getInstance(this).registerReceiver(
                loginEventReceiver,
                new IntentFilter(RemoteApi.REMOTE_LOGIN_EVENT_FILTER));
        LocalBroadcastManager.getInstance(this).registerReceiver(
                projectsEventReceiver,
                new IntentFilter(REMOTE_PROJECT_DATA_EVENT_FILTER));
        updateView();

        if (RemoteApi.get().isLogged()) {
            remoteRequest(new ProjectMembershipAction());
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        LocalBroadcastManager.getInstance(this).unregisterReceiver(
                loginEventReceiver);
        LocalBroadcastManager.getInstance(this).unregisterReceiver(
                projectsEventReceiver);
    }

    @Override
    public void projectMembershipAction(long projectId, boolean join) {
        remoteRequest(new ProjectMembershipAction(join ? "join" : "leave",
                projectId));
    }

    private void updateView() {
        if (RemoteApi.get().isLogged()) {
            loginToggle.setText(R.string.project_browser_logout);
            status.setText(String.format(
                    getResources()
                            .getString(R.string.project_browser_logged_in),
                    RemoteApi.get().getUsername()));
            list.setVisibility(View.VISIBLE);
            adapter.notifyDataSetChanged();
        } else {
            loginToggle.setText(R.string.project_browser_login);
            status.setText(R.string.project_browser_not_logged);
            list.setVisibility(View.GONE);
        }

        findViewById(R.id.project_browser_header).invalidate();
        Log.d("stk projects", "updated");
    }

    /**
     * Example of server output:
     * <p>
     * [ {"id":11,"title":"Fastest lift in the UK","author":"author","joined":
     * false}, {"id":32768,"title":"lifts!","author":"evilfer","joined":false} ]
     */

    private class ProjectMembershipAction extends RemoteJsonAction {

        String action;
        long projectId;

        public ProjectMembershipAction() {
            this(null, 0);
        }

        public ProjectMembershipAction(String action, long projectId) {
            this.projectId = projectId;
            this.action = action;
        }

        @Override
        public HttpRequestBase[] createRequests(String urlBase) {
            HttpRequestBase[] requests = new HttpRequestBase[1];

            if (action == null) {
                requests[0] = new HttpGet(String.format("%sprojects/%s",
                        urlBase, projectType));
            } else {
                requests[0] = new HttpPut(String.format("%sprojects/%s/%d/%s",
                        urlBase, projectType, projectId, action));
            }

            return requests;
        }

        @Override
        public void result(int request, JSONObject shouldbenull,
                           JSONArray result) {
            Log.d("stk remote", "projects: " + result.length());

            Vector<ProjectData> projects = new Vector<ProjectData>();

            try {
                for (int i = 0; i < result.length(); i++) {
                    JSONObject obj = result.getJSONObject(i);
                    ProjectData p = new ProjectData();
                    p.id = obj.getLong("id");
                    p.title = obj.getString("title");
                    p.joined = obj.getBoolean("joined");
                    p.author = obj.getString("author");

                    projects.add(p);
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }

            adapter.updateProjectList(projects);
            Intent i = new Intent(REMOTE_PROJECT_DATA_EVENT_FILTER);
            LocalBroadcastManager.getInstance(getApplicationContext())
                    .sendBroadcast(i);

            projectMembershipUpdated();
        }
    }

    protected abstract void projectMembershipUpdated();
}