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/******************************************************************************* * Copyright (c) 2014 IBM Corp.//from w w w. j a v a2s. c o m * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * and Eclipse Distribution License v1.0 which accompany this distribution. * * The Eclipse Public License is available at * http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * Contributors: * Mike Robertson - initial contribution *******************************************************************************/ package com.ibm.demo.IoTStarter.activities; import android.app.ActionBar; import android.app.Activity; import android.app.FragmentTransaction; import android.content.res.Configuration; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.TextView; import com.ibm.demo.IoTStarter.R; import com.ibm.demo.IoTStarter.fragments.DrawFragment; import com.ibm.demo.IoTStarter.fragments.IoTFragment; import com.ibm.demo.IoTStarter.fragments.LogFragment; import com.ibm.demo.IoTStarter.fragments.LoginFragment; import com.ibm.demo.IoTStarter.utils.Constants; import java.util.ArrayList; /** * MainActivity acts as the primary activity in the application that displays * the fragment of the currently selected action bar tab. */ public class MainActivity extends Activity implements ActionBar.TabListener { private final static String TAG = MainActivity.class.getName(); private DrawFragment drawFragment; private LogFragment logFragment; private LoginFragment loginFragment; private IoTFragment iotFragment; private ArrayList<String> backStack; /** * Callback for handling when a new tab is selected. Replace fragment_container content * with the new fragment. In the case of IoT tab, also replace fragment_containerDraw. * @param tab The selected tab * @param fragmentTransaction The transaction containing this tab selection */ @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { Log.d(TAG, ".onTabSelected() entered"); if (tab.getText().equals(Constants.LOGIN_LABEL)) { fragmentTransaction.replace(R.id.fragment_container, loginFragment); try { fragmentTransaction.remove(drawFragment); } catch (Exception e) { e.printStackTrace(); } } else if (tab.getText().equals(Constants.IOT_LABEL)) { fragmentTransaction.replace(R.id.fragment_container, iotFragment); fragmentTransaction.replace(R.id.fragment_containerDraw, drawFragment); try { } catch (Exception e) { e.printStackTrace(); } } else if (tab.getText().equals(Constants.LOG_LABEL)) { fragmentTransaction.replace(R.id.fragment_container, logFragment); try { fragmentTransaction.remove(drawFragment); } catch (Exception e) { e.printStackTrace(); } // If switching to log tab, reset its badge value to 0 updateBadge(tab, 0); } } /** * Keep track of tab backStack when leaving tabs. * @param tab The tab being left * @param fragmentTransaction The transaction containing this tab selection */ @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { Log.d(TAG, ".onTabUnselected() entered"); int index = backStack.size()-1; if (tab.getText().equals(Constants.LOGIN_LABEL)) { if (!backStack.isEmpty() && Constants.LOGIN_LABEL.equals(backStack.get(index))) { backStack.remove(index); } else { backStack.add(Constants.LOGIN_LABEL); } } else if (tab.getText().equals(Constants.IOT_LABEL)) { if (!backStack.isEmpty() && Constants.IOT_LABEL.equals(backStack.get(index))) { backStack.remove(index); } else { backStack.add(Constants.IOT_LABEL); } try { fragmentTransaction.remove(drawFragment); } catch (Exception e) { e.printStackTrace(); } } else if (tab.getText().equals(Constants.LOG_LABEL)) { if (!backStack.isEmpty() && Constants.LOG_LABEL.equals(backStack.get(index))) { backStack.remove(index); } else { backStack.add(Constants.LOG_LABEL); } } } /** * Do nothing for now * @param tab The tab being selected * @param fragmentTransaction The transaction containing this tab selection */ @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { Log.d(TAG, ".onTabReselected() entered"); } /** * Create the MainActivity. Initialize the action bar tabs and restore activity saved state. * @param savedInstanceState The saved activity state */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Initialize all the fragments 1 time when creating the activity loginFragment = new LoginFragment(); iotFragment = new IoTFragment(); logFragment = new LogFragment(); drawFragment = new DrawFragment(); // backStack used for overriding back button backStack = new ArrayList<String>(); // Setup the action bar ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ActionBar.Tab loginTab = actionBar.newTab(); loginTab.setText(Constants.LOGIN_LABEL); loginTab.setTabListener(this); actionBar.addTab(loginTab); ActionBar.Tab iotTab = actionBar.newTab(); iotTab.setText(Constants.IOT_LABEL); iotTab.setTabListener(this); actionBar.addTab(iotTab); // The Log tab uses a custom view so that a badge value can be displayed. ActionBar.Tab logTab = actionBar.newTab(); logTab.setText(Constants.LOG_LABEL); logTab.setTabListener(this); logTab.setCustomView(createLogTabView()); actionBar.addTab(logTab); // Set current tab based on saved state. Mainly for screen rotations when activity is recreated. if(savedInstanceState != null) { int tabIndex = savedInstanceState.getInt("tabIndex"); getActionBar().setSelectedNavigationItem(tabIndex); } setContentView(R.layout.main); } /** * Save the current state of the activity. This is used to store the index of the currently * selected tab. * @param outState The state of the activity */ @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); int tabIndex = getActionBar().getSelectedNavigationIndex(); outState.putInt("tabIndex", tabIndex); } @Override protected void onResume() { super.onResume(); } @Override protected void onDestroy() { super.onDestroy(); } /** * Maintain a custom back stack for switching to previous tabs with the back button. * If back stack is empty, follow default activity behavior. */ @Override public void onBackPressed() { Log.d(TAG, ".onBackPressed() entered"); //super.onBackPressed(); if (!backStack.isEmpty()) { int selectedIndex = getActionBar().getSelectedNavigationIndex(); int index = backStack.size()-1; String tabLabel = backStack.get(index); backStack.remove(index); if (selectedIndex == 0) { backStack.add(Constants.LOGIN_LABEL); } else if (selectedIndex == 1) { backStack.add(Constants.IOT_LABEL); } else if (selectedIndex == 2) { backStack.add(Constants.LOG_LABEL); } if (Constants.LOGIN_LABEL.equals(tabLabel)) { getActionBar().setSelectedNavigationItem(0); } else if (Constants.IOT_LABEL.equals(tabLabel)) { getActionBar().setSelectedNavigationItem(1); } else if (Constants.LOG_LABEL.equals(tabLabel)) { getActionBar().setSelectedNavigationItem(2); } } else { super.onBackPressed(); } } @Override public void onConfigurationChanged(Configuration newConfig) { Log.d(TAG, ".onConfigurationChanged entered()"); super.onConfigurationChanged(newConfig); } /** * Creates the custom view for the Log Tab to support a badge value * @return view The custom view for the tab. */ public View createLogTabView() { FrameLayout view = (FrameLayout) this.getLayoutInflater().inflate(R.layout.log_badge, null); view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); ((TextView) view.findViewById(R.id.tab_title)).setText(Constants.LOG_LABEL); updateBadge((TextView) view.findViewById(R.id.tab_badge), 0); return view; } /** * Update the badge value on the specified action bar tab. * @param tab The tab to update. * @param badgeNumber The new badge value. */ public void updateBadge(ActionBar.Tab tab, int badgeNumber) { updateBadge((TextView) tab.getCustomView().findViewById(R.id.tab_badge), badgeNumber); } /** * Update the badge value on the specified action bar tab. * @param view The view to update. * @param badgeNumber The new badge value. */ private void updateBadge(TextView view, int badgeNumber) { if (badgeNumber > 0) { view.setVisibility(View.VISIBLE); view.setText(Integer.toString(badgeNumber)); } else { view.setVisibility(View.GONE); } } }