Java tutorial
/* * 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.willyan.viewpagerslideanimation; import android.content.Intent; import android.os.Build; 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.app.NavUtils; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.Window; import android.view.WindowManager; import com.willyan.viewpagerslideanimation.transformer.DepthPagerTransformer; import com.willyan.viewpagerslideanimation.transformer.ParallaxPagerTransformer; import com.willyan.viewpagerslideanimation.transformer.ZoomOutPagerTransformer; /** * Demonstrates a "screen-slide" animation using a {@link android.support.v4.view.ViewPager}. Because {@link android.support.v4.view.ViewPager} * automatically plays such an animation when calling {@link android.support.v4.view.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; public final static String EXTRA_TRANSFORMER = "PageTransformer"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) { getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); } setContentView(R.layout.activity_screen_slide); // Instantiate a ViewPager and a PagerAdapter. mPager = (ViewPager) findViewById(R.id.pager); mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager()); 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(); } }); String mode = getIntent().getStringExtra(EXTRA_TRANSFORMER); setTitle(mode); if (mode.equals(getString(R.string.slide_animation_zoomout))) { mPager.setPageTransformer(true, new ZoomOutPagerTransformer()); } else if (mode.equals(getString(R.string.slide_animation_depth))) { mPager.setPageTransformer(true, new DepthPagerTransformer()); } else if (mode.equals(getString(R.string.slide_animation_parallax))) { mPager.setPageTransformer(false, new ParallaxPagerTransformer(R.id.background)); } } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.menu_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 FragmentPagerAdapter { public ScreenSlidePagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { return ScreenSlidePageFragment.create(position); } @Override public int getCount() { return NUM_PAGES; } } }