| /* |
| * 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.animationsdemo; |
| |
| import android.app.Fragment; |
| import android.app.FragmentManager; |
| import android.content.Intent; |
| import android.os.Bundle; |
| import android.support.v13.app.FragmentStatePagerAdapter; |
| import android.support.v4.app.FragmentActivity; |
| import android.support.v4.app.NavUtils; |
| import android.support.v4.view.PagerAdapter; |
| import android.support.v4.view.ViewPager; |
| import android.view.Menu; |
| import android.view.MenuItem; |
| |
| /** |
| * Demonstrates a "screen-slide" animation using a {@link ViewPager}. Because {@link ViewPager} |
| * automatically plays such an animation when calling {@link ViewPager#setCurrentItem(int)}, there |
| * isn't any animation-specific code in this sample. |
| * |
| * <p>This sample shows a "next" button that advances the user to the next step in a wizard, |
| * animating the current screen out (to the left) and the next screen in (from the right). The |
| * reverse animation is played when the user presses the "previous" button.</p> |
| * |
| * @see ScreenSlidePageFragment |
| */ |
| public class ScreenSlideActivity extends FragmentActivity { |
| /** |
| * The number of pages (wizard steps) to show in this demo. |
| */ |
| private static final int NUM_PAGES = 5; |
| |
| /** |
| * The pager widget, which handles animation and allows swiping horizontally to access previous |
| * and next wizard steps. |
| */ |
| private ViewPager mPager; |
| |
| /** |
| * The pager adapter, which provides the pages to the view pager widget. |
| */ |
| private PagerAdapter mPagerAdapter; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.activity_screen_slide); |
| |
| // Instantiate a ViewPager and a PagerAdapter. |
| mPager = (ViewPager) findViewById(R.id.pager); |
| mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager()); |
| mPager.setAdapter(mPagerAdapter); |
| mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { |
| @Override |
| public void onPageSelected(int position) { |
| // When changing pages, reset the action bar actions since they are dependent |
| // on which page is currently active. An alternative approach is to have each |
| // fragment expose actions itself (rather than the activity exposing actions), |
| // but for simplicity, the activity provides the actions in this sample. |
| invalidateOptionsMenu(); |
| } |
| }); |
| } |
| |
| @Override |
| public boolean onCreateOptionsMenu(Menu menu) { |
| super.onCreateOptionsMenu(menu); |
| getMenuInflater().inflate(R.menu.activity_screen_slide, menu); |
| |
| menu.findItem(R.id.action_previous).setEnabled(mPager.getCurrentItem() > 0); |
| |
| // Add either a "next" or "finish" button to the action bar, depending on which page |
| // is currently selected. |
| MenuItem item = menu.add(Menu.NONE, R.id.action_next, Menu.NONE, |
| (mPager.getCurrentItem() == mPagerAdapter.getCount() - 1) |
| ? R.string.action_finish |
| : R.string.action_next); |
| item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT); |
| return true; |
| } |
| |
| @Override |
| public boolean onOptionsItemSelected(MenuItem item) { |
| switch (item.getItemId()) { |
| case android.R.id.home: |
| // Navigate "up" the demo structure to the launchpad activity. |
| // See http://developer.android.com/design/patterns/navigation.html for more. |
| NavUtils.navigateUpTo(this, new Intent(this, MainActivity.class)); |
| return true; |
| |
| case R.id.action_previous: |
| // Go to the previous step in the wizard. If there is no previous step, |
| // setCurrentItem will do nothing. |
| mPager.setCurrentItem(mPager.getCurrentItem() - 1); |
| return true; |
| |
| case R.id.action_next: |
| // Advance to the next step in the wizard. If there is no next step, setCurrentItem |
| // will do nothing. |
| mPager.setCurrentItem(mPager.getCurrentItem() + 1); |
| return true; |
| } |
| |
| return super.onOptionsItemSelected(item); |
| } |
| |
| /** |
| * A simple pager adapter that represents 5 {@link ScreenSlidePageFragment} objects, in |
| * sequence. |
| */ |
| private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter { |
| public ScreenSlidePagerAdapter(FragmentManager fm) { |
| super(fm); |
| } |
| |
| @Override |
| public Fragment getItem(int position) { |
| return ScreenSlidePageFragment.create(position); |
| } |
| |
| @Override |
| public int getCount() { |
| return NUM_PAGES; |
| } |
| } |
| } |