Android Open Source - pawang-ujan Main Activity

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From Project

Back to project page pawang-ujan.

License

The source code is released under:

Apache License

Java Source Code

package com.salatiga.code;
//w  w w  . j a  va2  s .  c  o  m
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.salatiga.code.adapter.TabsPagerAdapter;

/**
 * Class ini adalah tampilan utama
 * @author Hendro Steven Tampake
 * @version 1.0
 *
 */
public class MainActivity extends FragmentActivity implements
    ActionBar.TabListener {

  public static final String WIFI = "Wi-Fi";
  public static final String ANY = "Any";
  // Whether there is a Wi-Fi connection.
  public static boolean wifiConnected = false;
  // Whether there is a mobile connection.
  public static boolean mobileConnected = false;
  // Whether the display should be refreshed.
  public static boolean refreshDisplay = true;
  // The user's current network preference setting.
  public static String sPref = null;
  // The BroadcastReceiver that tracks network connectivity changes.
  private NetworkReceiver receiver = new NetworkReceiver();

  private ViewPager viewPager;
  private TabsPagerAdapter mAdapter;
  private ActionBar actionBar;
  // Tab titles
  private String[] tabs = { "Cuaca Terkini", "Gempa Terkini" };
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);    
    
    // Register BroadcastReceiver to track connection changes.
    IntentFilter filter = new IntentFilter(
        ConnectivityManager.CONNECTIVITY_ACTION);
    receiver = new NetworkReceiver();
    this.registerReceiver(receiver, filter);

    // Initilization
    viewPager = (ViewPager) findViewById(R.id.pager);
    actionBar = getActionBar();
    mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

    viewPager.setAdapter(mAdapter);
    actionBar.setHomeButtonEnabled(false);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // Adding Tabs
    for (String tab_name : tabs) {
      actionBar.addTab(actionBar.newTab().setText(tab_name)
          .setTabListener(this));
    }

    /**
     * on swiping the viewpager make respective tab selected
     * */
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

      @Override
      public void onPageSelected(int position) {
        // on changing the page
        // make respected tab selected
        actionBar.setSelectedNavigationItem(position);
      }

      @Override
      public void onPageScrolled(int arg0, float arg1, int arg2) {
      }

      @Override
      public void onPageScrollStateChanged(int arg0) {
      }
    });
  }

  // Refreshes the display if the network connection and the
  // pref settings allow it.
  @Override
  public void onStart() {
    super.onStart();

    // Gets the user's network preference settings
    SharedPreferences sharedPrefs = PreferenceManager
        .getDefaultSharedPreferences(this);

    // Retrieves a string value for the preferences. The second parameter
    // is the default value to use if a preference value is not found.
    sPref = sharedPrefs.getString("listPref", "Any");

    updateConnectedFlags();

    // Only loads the page if refreshDisplay is true. Otherwise, keeps
    // previous
    // display. For example, if the user has set "Wi-Fi only" in prefs and
    // the
    // device loses its Wi-Fi connection midway through the user using the
    // app,
    // you don't want to refresh the display--this would force the display
    // of
    // an error page instead of stackoverflow.com content.
    //if (refreshDisplay) {
    //  loadPage();
    //}
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    if (receiver != null) {
      this.unregisterReceiver(receiver);
    }
  }

  // Checks the network connection and sets the wifiConnected and
  // mobileConnected
  // variables accordingly.
  private void updateConnectedFlags() {
    ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();
    if (activeInfo != null && activeInfo.isConnected()) {
      wifiConnected = activeInfo.getType() == ConnectivityManager.TYPE_WIFI;
      mobileConnected = activeInfo.getType() == ConnectivityManager.TYPE_MOBILE;
    } else {
      wifiConnected = false;
      mobileConnected = false;
    }
  }

  // Uses AsyncTask subclass to download the XML feed from stackoverflow.com.
  // This avoids UI lock up. To prevent network operations from
  // causing a delay that results in a poor user experience, always perform
  // network operations on a separate thread from the UI.
  private void loadPage() {
    if (((sPref.equals(ANY)) && (wifiConnected || mobileConnected))
        || ((sPref.equals(WIFI)) && (wifiConnected))) {
      if(viewPager.getCurrentItem()==1){
        GempaFragment gempaFragment = (GempaFragment)viewPager.getAdapter().instantiateItem(viewPager, viewPager.getCurrentItem());
        gempaFragment.loadPage();
      }else if(viewPager.getCurrentItem()==0){
        CuacaFragment cuacaFragment = (CuacaFragment)viewPager.getAdapter().instantiateItem(viewPager, viewPager.getCurrentItem());
        cuacaFragment.loadData();
      }
    } else {
      showErrorPage();
    }
  }

  // Displays an error if the app is unable to load content.
  private void showErrorPage() {
    Toast.makeText(this,
        getResources().getString(R.string.connection_error),
        Toast.LENGTH_LONG).show();
    
    
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);
  }

  // Handles the user's menu selection.
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.action_settings:
      Intent settingsActivity = new Intent(getBaseContext(),
          SettingsActivity.class);
      startActivity(settingsActivity);
      return true;
    case R.id.action_refresh:
      loadPage();
      return true;
    case R.id.action_about:
      Intent infoActivity = new Intent(getBaseContext(),
          InfoActivity.class);
      startActivity(infoActivity);
      return true;
    case R.id.action_exit:
      System.exit(0);
    default:
      return super.onOptionsItemSelected(item);
    }
  }

  @Override
  public void onTabReselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub

  }

  @Override
  public void onTabSelected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub
    viewPager.setCurrentItem(tab.getPosition());
  }

  @Override
  public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub

  }

  public class NetworkReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
      ConnectivityManager connMgr = (ConnectivityManager) context
          .getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

      // Checks the user prefs and the network connection. Based on the
      // result, decides
      // whether
      // to refresh the display or keep the current display.
      // If the userpref is Wi-Fi only, checks to see if the device has a
      // Wi-Fi connection.
      if (WIFI.equals(sPref) && networkInfo != null
          && networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
        // If device has its Wi-Fi connection, sets refreshDisplay
        // to true. This causes the display to be refreshed when the
        // user
        // returns to the app.
        refreshDisplay = true;
        Toast.makeText(context, R.string.wifi_connected,
            Toast.LENGTH_SHORT).show();

        // If the setting is ANY network and there is a network
        // connection
        // (which by process of elimination would be mobile), sets
        // refreshDisplay to true.
      } else if (ANY.equals(sPref) && networkInfo != null) {
        refreshDisplay = true;

        // Otherwise, the app can't download content--either because
        // there is no network
        // connection (mobile or Wi-Fi), or because the pref setting is
        // WIFI, and there
        // is no Wi-Fi connection.
        // Sets refreshDisplay to false.
      } else {
        refreshDisplay = false;
        Toast.makeText(context, R.string.lost_connection,
            Toast.LENGTH_SHORT).show();
      }
    }
  }
}

Java Source Code List

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