| /* |
| * Copyright 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.effectivenavigation; |
| |
| import android.app.ActionBar; |
| import android.app.FragmentTransaction; |
| import android.content.Intent; |
| 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.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.TextView; |
| |
| public class MainActivity extends FragmentActivity implements ActionBar.TabListener { |
| |
| /** |
| * The {@link android.support.v4.view.PagerAdapter} that will provide fragments for each of the |
| * three primary sections of the app. We use a {@link android.support.v4.app.FragmentPagerAdapter} |
| * derivative, which will keep every loaded fragment in memory. If this becomes too memory |
| * intensive, it may be best to switch to a {@link android.support.v4.app.FragmentStatePagerAdapter}. |
| */ |
| AppSectionsPagerAdapter mAppSectionsPagerAdapter; |
| |
| /** |
| * The {@link ViewPager} that will display the three primary sections of the app, one at a |
| * time. |
| */ |
| ViewPager mViewPager; |
| |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_main); |
| |
| // Create the adapter that will return a fragment for each of the three primary sections |
| // of the app. |
| mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager()); |
| |
| // Set up the action bar. |
| final ActionBar actionBar = getActionBar(); |
| |
| // Specify that the Home/Up button should not be enabled, since there is no hierarchical |
| // parent. |
| actionBar.setHomeButtonEnabled(false); |
| |
| // Specify that we will be displaying tabs in the action bar. |
| actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); |
| |
| // Set up the ViewPager, attaching the adapter and setting up a listener for when the |
| // user swipes between sections. |
| mViewPager = (ViewPager) findViewById(R.id.pager); |
| mViewPager.setAdapter(mAppSectionsPagerAdapter); |
| mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { |
| @Override |
| public void onPageSelected(int position) { |
| // When swiping between different app sections, select the corresponding tab. |
| // We can also use ActionBar.Tab#select() to do this if we have a reference to the |
| // Tab. |
| actionBar.setSelectedNavigationItem(position); |
| } |
| }); |
| |
| // For each of the sections in the app, add a tab to the action bar. |
| for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) { |
| // Create a tab with text corresponding to the page title defined by the adapter. |
| // Also specify this Activity object, which implements the TabListener interface, as the |
| // listener for when this tab is selected. |
| actionBar.addTab( |
| actionBar.newTab() |
| .setText(mAppSectionsPagerAdapter.getPageTitle(i)) |
| .setTabListener(this)); |
| } |
| } |
| |
| @Override |
| public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { |
| } |
| |
| @Override |
| public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { |
| // When the given tab is selected, switch to the corresponding page in the ViewPager. |
| mViewPager.setCurrentItem(tab.getPosition()); |
| } |
| |
| @Override |
| public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { |
| } |
| |
| /** |
| * A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary |
| * sections of the app. |
| */ |
| public static class AppSectionsPagerAdapter extends FragmentPagerAdapter { |
| |
| public AppSectionsPagerAdapter(FragmentManager fm) { |
| super(fm); |
| } |
| |
| @Override |
| public Fragment getItem(int i) { |
| switch (i) { |
| case 0: |
| // The first section of the app is the most interesting -- it offers |
| // a launchpad into the other demonstrations in this example application. |
| return new LaunchpadSectionFragment(); |
| |
| default: |
| // The other sections of the app are dummy placeholders. |
| Fragment fragment = new DummySectionFragment(); |
| Bundle args = new Bundle(); |
| args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, i + 1); |
| fragment.setArguments(args); |
| return fragment; |
| } |
| } |
| |
| @Override |
| public int getCount() { |
| return 3; |
| } |
| |
| @Override |
| public CharSequence getPageTitle(int position) { |
| return "Section " + (position + 1); |
| } |
| } |
| |
| /** |
| * A fragment that launches other parts of the demo application. |
| */ |
| public static class LaunchpadSectionFragment extends Fragment { |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| View rootView = inflater.inflate(R.layout.fragment_section_launchpad, container, false); |
| |
| // Demonstration of a collection-browsing activity. |
| rootView.findViewById(R.id.demo_collection_button) |
| .setOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View view) { |
| Intent intent = new Intent(getActivity(), CollectionDemoActivity.class); |
| startActivity(intent); |
| } |
| }); |
| |
| // Demonstration of navigating to external activities. |
| rootView.findViewById(R.id.demo_external_activity) |
| .setOnClickListener(new View.OnClickListener() { |
| @Override |
| public void onClick(View view) { |
| // Create an intent that asks the user to pick a photo, but using |
| // FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET, ensures that relaunching |
| // the application from the device home screen does not return |
| // to the external activity. |
| Intent externalActivityIntent = new Intent(Intent.ACTION_PICK); |
| externalActivityIntent.setType("image/*"); |
| externalActivityIntent.addFlags( |
| Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); |
| startActivity(externalActivityIntent); |
| } |
| }); |
| |
| return rootView; |
| } |
| } |
| |
| /** |
| * A dummy fragment representing a section of the app, but that simply displays dummy text. |
| */ |
| public static class DummySectionFragment extends Fragment { |
| |
| public static final String ARG_SECTION_NUMBER = "section_number"; |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| View rootView = inflater.inflate(R.layout.fragment_section_dummy, container, false); |
| Bundle args = getArguments(); |
| ((TextView) rootView.findViewById(android.R.id.text1)).setText( |
| getString(R.string.dummy_section_text, args.getInt(ARG_SECTION_NUMBER))); |
| return rootView; |
| } |
| } |
| } |