Java tutorial
/* * Licensed Materials - Property of IBM * * 5747-SM3 * * (C) Copyright IBM Corp. 1999, 2012 All Rights Reserved. * * US Government Users Restricted Rights - Use, duplication or * disclosure restricted by GSA ADP Schedule Contract with * IBM Corp. * */ package com.ibm.msg.android; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.util.ArrayList; import android.app.ActionBar; import android.app.FragmentTransaction; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.view.Menu; /** * The connection details activity operates the fragments that make up the * connection details screen. * <p> * The fragments which this FragmentActivity uses are * <ul> * <li>{@link HistoryFragment} * <li>{@link PublishFragment} * <li>{@link SubscribeFragment} * </ul> * */ public class ConnectionDetails extends FragmentActivity implements ActionBar.TabListener { /** * {@link SectionsPagerAdapter} that is used to get pages to display */ SectionsPagerAdapter sectionsPagerAdapter; /** * {@link ViewPager} object allows pages to be flipped left and right */ ViewPager viewPager; /** The currently selected tab **/ private int selected = 0; /** * The handle to the {@link Connection} which holds the data for the client * selected **/ private String clientHandle = null; /** This instance of <code>ConnectionDetails</code> **/ private final ConnectionDetails connectionDetails = this; /** * The instance of {@link Connection} that the <code>clientHandle</code> * represents **/ private Connection connection = null; /** * The {@link ChangeListener} this object is using for the connection * updates **/ private ChangeListener changeListener = null; /** * @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle) */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); clientHandle = getIntent().getStringExtra("handle"); setContentView(R.layout.activity_connection_details); // Create the adapter that will return a fragment for each of the pages sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); // Set up the action bar for tab navigation final ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // add the sectionsPagerAdapter viewPager = (ViewPager) findViewById(R.id.pager); viewPager.setAdapter(sectionsPagerAdapter); viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // select the tab that represents the current page actionBar.setSelectedNavigationItem(position); } }); // Create the tabs for the screen for (int i = 0; i < sectionsPagerAdapter.getCount(); i++) { ActionBar.Tab tab = actionBar.newTab(); tab.setText(sectionsPagerAdapter.getPageTitle(i)); tab.setTabListener(this); actionBar.addTab(tab); } connection = Connections.getInstance(this).getConnection(clientHandle); changeListener = new ChangeListener(); connection.registerChangeListener(changeListener); } @Override protected void onDestroy() { connection.removeChangeListener(null); super.onDestroy(); } /** * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu) */ @Override public boolean onCreateOptionsMenu(Menu menu) { int menuID; Integer button = null; boolean connected = Connections.getInstance(this).getConnection(clientHandle).isConnected(); // Select the correct action bar menu to display based on the // connectionStatus and which tab is selected if (connected) { switch (selected) { case 0: // history view menuID = R.menu.activity_connection_details; break; case 1: // subscribe view menuID = R.menu.activity_subscribe; button = R.id.subscribe; break; case 2: // publish view menuID = R.menu.activity_publish; button = R.id.publish; break; default: menuID = R.menu.activity_connection_details; break; } } else { switch (selected) { case 0: // history view menuID = R.menu.activity_connection_details_disconnected; break; case 1: // subscribe view menuID = R.menu.activity_subscribe_disconnected; button = R.id.subscribe; break; case 2: // publish view menuID = R.menu.activity_publish_disconnected; button = R.id.publish; break; default: menuID = R.menu.activity_connection_details_disconnected; break; } } // inflate the menu selected getMenuInflater().inflate(menuID, menu); Listener listener = new Listener(this, clientHandle); // add listeners if (button != null) { // add listeners menu.findItem(button).setOnMenuItemClickListener(listener); if (!Connections.getInstance(this).getConnection(clientHandle).isConnected()) { menu.findItem(button).setEnabled(false); } } // add the listener to the disconnect or connect menu option if (connected) { menu.findItem(R.id.disconnect).setOnMenuItemClickListener(listener); } else { menu.findItem(R.id.connectMenuOption).setOnMenuItemClickListener(listener); } return true; } /** * @see android.app.ActionBar.TabListener#onTabUnselected(android.app.ActionBar.Tab, * android.app.FragmentTransaction) */ @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // Don't need to do anything when a tab is unselected } /** * @see android.app.ActionBar.TabListener#onTabSelected(android.app.ActionBar.Tab, * android.app.FragmentTransaction) */ @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in // the ViewPager. viewPager.setCurrentItem(tab.getPosition()); selected = tab.getPosition(); // invalidate the options menu so it can be updated invalidateOptionsMenu(); // history fragment is at position zero so get this then refresh its // view ((HistoryFragment) sectionsPagerAdapter.getItem(0)).refresh(); } /** * @see android.app.ActionBar.TabListener#onTabReselected(android.app.ActionBar.Tab, * android.app.FragmentTransaction) */ @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // Don't need to do anything when the tab is reselected } /** * Provides the Activity with the pages to display for each tab * */ public class SectionsPagerAdapter extends FragmentPagerAdapter { // Stores the instances of the pages private ArrayList<Fragment> fragments = null; /** * Only Constructor, requires a the activity's fragment managers * * @param fragmentManager */ public SectionsPagerAdapter(FragmentManager fragmentManager) { super(fragmentManager); fragments = new ArrayList<Fragment>(); // create the history view, passes the client handle as an argument // through a bundle Fragment fragment = new HistoryFragment(); Bundle args = new Bundle(); args.putString("handle", getIntent().getStringExtra("handle")); fragment.setArguments(args); // add all the fragments for the display to the fragments list fragments.add(fragment); fragments.add(new SubscribeFragment()); fragments.add(new PublishFragment()); } /** * @see android.support.v4.app.FragmentPagerAdapter#getItem(int) */ @Override public Fragment getItem(int position) { return fragments.get(position); } /** * @see android.support.v4.view.PagerAdapter#getCount() */ @Override public int getCount() { return fragments.size(); } /** * * @see FragmentPagerAdapter#getPageTitle(int) */ @Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return getString(R.string.history).toUpperCase(); case 1: return getString(R.string.subscribe).toUpperCase(); case 2: return getString(R.string.publish).toUpperCase(); } // return null if there is no title matching the position return null; } } /** * <code>ChangeListener</code> updates the UI when the {@link Connection} * object it is associated with updates * */ private class ChangeListener implements PropertyChangeListener { /** * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent) */ @Override public void propertyChange(PropertyChangeEvent event) { // connection object has change refresh the UI connectionDetails.runOnUiThread(new Runnable() { @Override public void run() { connectionDetails.invalidateOptionsMenu(); ((HistoryFragment) connectionDetails.sectionsPagerAdapter.getItem(0)).refresh(); } }); } } }