android.support.v4.view.ViewPager#setPageTransformer ( )源码实例Demo

private void initViews() {
	setSwipeBackEnable(false);
	mBlurImageView = (ImageView) findViewById(R.id.blur_overlay_img);
	mRootView = (FrameLayout) findViewById(R.id.root_view);
	mAddCityBtn = (Button) findViewById(R.id.add_city_btn);
	mAddCityBtn.setOnClickListener(this);
	mTitleTextView = (TextView) findViewById(R.id.location_city_textview);
	mLocationIV = (ImageView) findViewById(R.id.curr_loc_icon);
	mMainViewPager = (ViewPager) findViewById(R.id.main_viewpager);
	ParallaxPagerTransformer pt = new ParallaxPagerTransformer((R.id.top_part));
       //pt.setBorder(20);
       pt.setSpeed(0.5f);
       mMainViewPager.setPageTransformer(false, pt);
	mFragmentAdapter = new WeatherPagerAdapter(this);
	mMainViewPager.setAdapter(mFragmentAdapter);
	mCirclePageIndicator = (CirclePageIndicator) findViewById(R.id.indicator);
	mCirclePageIndicator.setViewPager(mMainViewPager);
	mCirclePageIndicator.setOnPageChangeListener(this);

	mTitleTextView.setOnClickListener(this);
	findViewById(R.id.sidebarButton).setOnClickListener(this);
	mShareBtn = (ImageView) findViewById(R.id.shareButton);
	mShareBtn.setOnClickListener(this);
}
 

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_image_slider, container, false);
    viewPager = (ViewPager) v.findViewById(R.id.viewpager);
    setHasOptionsMenu(true);
    toolbar=(Toolbar)v.findViewById(R.id.slider_toolbar);
    save=v.findViewById(R.id.save_Item);
    setToolbar();
    //((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
    images=getArguments().getStringArray("path");
    selectedPosition = getArguments().getInt("position");
    size=getArguments().getInt("total");
    myViewPagerAdapter = new MyViewPagerAdapter();
    viewPager.setPageTransformer(true,new ZoomOutPageTransformer());
    viewPager.setAdapter(myViewPagerAdapter);
    viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
    setCurrentItem(selectedPosition);

    return v;
}
 

/**
 * Sets a {@link android.support.v4.view.ViewPager.PageTransformer} to the given ViewPager.
 * Using this method to set PageTransformer is required for the ViewPagers that already have
 * {@link SparkleAnimationPresenter} installed.
 *
 * @param viewPager ViewPager instance.
 * @param reversDrawingOrder Whether the ViewPager should reverse it child Views' drawing
 * order.
 * @param transformer PageTransformer instance.
 * @see {@link ViewPager#setPageTransformer(boolean, ViewPager.PageTransformer)}
 * @see {@link android.support.v4.view.ViewPager.PageTransformer}
 */
public static void setPageTransformer(@NonNull ViewPager viewPager, boolean reversDrawingOrder,
        @Nullable final ViewPager.PageTransformer transformer) {
    Object tagObject = viewPager.getTag(R.id.presenter_id);
    if (tagObject == null || !(tagObject instanceof SparkleAnimationPresenter)) {
        viewPager.setPageTransformer(reversDrawingOrder, transformer);
        return;
    }

    final SparkleAnimationPresenter presenter = (SparkleAnimationPresenter) tagObject;
    ViewPager.PageTransformer transformerWrapper = new ViewPager.PageTransformer() {
        @Override
        public void transformPage(View page, float position) {
            int pageWidth = page.getWidth();
            float offset = pageWidth * -position;

            presenter.presentAnimations(page, position, offset);
            if (transformer != null) {
                transformer.transformPage(page, position);
            }
        }
    };

    viewPager.setPageTransformer(reversDrawingOrder, transformerWrapper);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_gallery_detail);
    pager= (ViewPager) findViewById(R.id.galleryViewPager);
    progressBar= (ProgressBar) findViewById(R.id.progressBar);
    adapter=new GalleryDetailAdapter(getSupportFragmentManager());
    pager.setAdapter(adapter);
    pager.setPageTransformer(true,new RotateDownPageTransformer());
    Intent i=getIntent();
    if(i!=null){
        if(new Connection(this).isInternet()){
            getGalleryData(i.getStringExtra(ID));
        }
        else {
            progressBar.setVisibility(View.GONE);
        }
    }



}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    FDroidApp fdroidApp = (FDroidApp) getApplication();
    fdroidApp.applyTheme(this);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_screenshots);

    String packageName = getIntent().getStringExtra(EXTRA_PACKAGE_NAME);
    int startPosition = getIntent().getIntExtra(EXTRA_START_POSITION, 0);

    App app = AppProvider.Helper.findHighestPriorityMetadata(getContentResolver(), packageName);
    String[] screenshots = app.getAllScreenshots(this);

    ViewPager viewPager = (ViewPager) findViewById(R.id.screenshot_view_pager);
    ScreenShotPagerAdapter adapter = new ScreenShotPagerAdapter(getSupportFragmentManager(), screenshots);
    viewPager.setAdapter(adapter);
    viewPager.setCurrentItem(startPosition);

    // display some nice animation while swiping
    viewPager.setPageTransformer(true, new DepthPageTransformer());
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_gallery_detail);

    pager = (ViewPager) findViewById(R.id.galleryViewPager);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);

    adapter = new GalleryDetailAdapter(getSupportFragmentManager());
    pager.setAdapter(adapter);
    pager.setPageTransformer(true, new RotateDownPageTransformer());

    Intent i = getIntent();

    if (i != null) {
        if (new Connection(this).isInternet()) {
            getGalleryData(i.getStringExtra(ID));
        } else {
            progressBar.setVisibility(View.GONE);
        }
    }


}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);

	final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
	setSupportActionBar(toolbar);
	//noinspection ConstantConditions
	getSupportActionBar().setDisplayShowTitleEnabled(false);

	setSpinner();

	mViewPager = (ViewPager) findViewById(R.id.viewPager);
	mViewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
	mViewPager.setPageTransformer(false, new ColorTransformer());
}
 

public boolean initWidget() {

        setContentView(R.layout.activity_imagelooker);

        ImageLibUitls.setHomeActionBar(this);

        //ViewPager的adapter
        adapter = new ImageLookerAdapter(getSupportFragmentManager(), imagesList);
        pager = (ViewPager) findViewById(R.id.imagebrowser_svp_pager);
        mPtvPage = (PhotoTextView) findViewById(R.id.imagebrowser_ptv_page);
        llPage = findViewById(R.id.llPage);
        pager.setAdapter(adapter);

        pager.setPageTransformer(true, new DepthPageTransformer());
        //点击了哪一个，显示哪一个
        pager.setCurrentItem(mPosition, false);
        pager.setOnPageChangeListener(this);

        if (imagesList.size() <= 1) {
            llPage.setVisibility(View.GONE);
        } else {
            mPtvPage.setText((mPosition) + 1 + "/" + imagesList.size());

        }
        return true;
    }
 

/**
 * 初始化view
 */
private void setupViews() {
	mPlayContainer = (LinearLayout) findViewById(R.id.ll_play_container);
	mPlayBackImageView = (ImageView) findViewById(R.id.iv_play_back);
	mMusicTitle = (TextView) findViewById(R.id.tv_music_title);
	mViewPager = (ViewPager) findViewById(R.id.vp_play_container);
	mPlaySeekBar = (SeekBar) findViewById(R.id.sb_play_progress);
	mStartPlayButton = (ImageButton) findViewById(R.id.ib_play_start);
	mPagerIndicator = (PagerIndicator) findViewById(R.id.pi_play_indicator);
	
	// 动态设置seekbar的margin
	MarginLayoutParams p = (MarginLayoutParams) mPlaySeekBar.getLayoutParams();
	p.leftMargin = (int) (App.sScreenWidth * 0.1);
	p.rightMargin = (int) (App.sScreenWidth * 0.1);
	
	mPlaySeekBar.setOnSeekBarChangeListener(mSeekBarChangeListener);
	
	initViewPagerContent();
	mViewPager.setPageTransformer(true, new PlayPageTransformer());
	mPagerIndicator.create(mViewPagerContent.size());
	mViewPager.setOnPageChangeListener(mPageChangeListener);
	mViewPager.setAdapter(mPagerAdapter);
	
	mPlayBackImageView.setOnClickListener(this);
}
 

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View inflate = inflater.inflate(R.layout.fragment_vp_transformer, null);
    ViewPager vp = (ViewPager) inflate.findViewById(R.id.vp);
    WelcomePagerAdapter adapter = new WelcomePagerAdapter(getActivity().getSupportFragmentManager());
    vp.setPageTransformer(true, new VpTransformer());
    vp.setAdapter(adapter);

    return inflate;
}
 

private void initPager() {
    pager=(ViewPager) findViewById(R.id.view_pager);
    PagerAdapter adapter=new ViewAdapter(pages);
    pager.setAdapter(adapter);

    switch (getIntent().getIntExtra(TransformerType.TYPE, TransformerType.NORMAL)) {
        case TransformerType.SCALE:
            pager.setPageTransformer(true, new ScalePageTransformer());
            break;
        case TransformerType.ROTATE:
            pager.setPageTransformer(true, new RotatePageTransformer());
            break;
        default:break;
    }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tutorial);

    mButtonLeft = (Button) findViewById(R.id.tutorial_button_left);
    mImageButtonLeft = (ImageButton) findViewById(R.id.tutorial_button_image_left);
    mImageButtonRight = (ImageButton) findViewById(R.id.tutorial_button_image_right);
    mPageIndicator = (PageIndicator) findViewById(R.id.tutorial_page_indicator);
    mRelativeLayout = (RelativeLayout) findViewById(R.id.relative_layout);
    mViewPager = (ViewPager) findViewById(R.id.view_pager);

    mButtonLeft.setOnClickListener(this);
    mImageButtonLeft.setOnClickListener(this);
    mImageButtonRight.setOnClickListener(this);
    mImageButtonLeft.setOnLongClickListener(this);
    mImageButtonRight.setOnLongClickListener(this);

    setupFragmentList();

    mAdapter = new TutorialViewPagerAdapter(getSupportFragmentManager());

    mAdapter.setFragments(mFragmentList);

    mRelativeLayout.setBackgroundColor(Color.BLUE);
    mViewPager.setAdapter(mAdapter);
    mViewPager.addOnPageChangeListener(this);
    mViewPager.setPageTransformer(false, getPageTransformer());

    mPageIndicator.setEngine(getPageIndicatorEngine());
    mPageIndicator.setViewPager(mViewPager);

    //We use this to actualize the Strings
    mPreviousPage = 0;
    onPageSelected(0);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mToolbar = (Toolbar) findViewById(R.id.toolbar);
    mToolbar.setNavigationIcon(R.mipmap.ic_nav_main);
    mToolbar.setOnMenuItemClickListener(this);
    mToolbar.inflateMenu(R.menu.menu_main);

    initSyncItem();
    initTitle();

    mCreate = findViewById(R.id.main_img_create);
    mCreate.setOnClickListener(this);

    mAdapter = new SectionsPagerAdapter(getFragmentManager());
    mPager = (ViewPager) findViewById(R.id.container);
    mPager.setAdapter(mAdapter);
    mPager.setOnPageChangeListener(mAdapter);
    mPager.setPageTransformer(true, new ZoomOutPageTransformer());

    mPresenter = new SyncPresenter(this);

    // Get the Create button Translation 56+16+8 dp
    mCreateTranslationY = (int) (getResources().getDisplayMetrics().density * 80);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	final ViewPager viewpager = (ViewPager) findViewById(R.id.viewpager);
	final ScreenSlidePagerAdapter screenSlidePagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
	viewpager.setAdapter(screenSlidePagerAdapter);
	viewpager.setPageTransformer(true, new CustomTransformer());
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//去掉信息栏
    setContentView(R.layout.activity_main);
    setFullscreen();

    fragment00 = new GuideFragment();
    fragment01 = new GuideFragment();
    fragment02 = new GuideFragment();
    fragment03 = new GuideFragment();

    fragmentList.add(fragment00);
    fragmentList.add(fragment01);
    fragmentList.add(fragment02);
    fragmentList.add(fragment03);


    viewpager = (ViewPager) findViewById(R.id.viewpager);
    iv_device = (ImageView) findViewById(R.id.iv_device);
    iv_final_photo = (ImageView) findViewById(R.id.iv_final_photo);
    tv_avatar_you = (TextView) findViewById(R.id.tv_avatar_you);
    tv_register = (TextView) findViewById(R.id.tv_register);

    blurringView = (BlurringView) findViewById(R.id.blurringView);

    ll_rows = (LinearLayout) findViewById(R.id.ll_rows);
    ll_comments = (LinearLayout) findViewById(R.id.ll_comments);

    iv_initial_phone = (ImageView) findViewById(R.id.iv_initial_phone);

    View blurredView = findViewById(R.id.blurredView);
    blurringView.setBlurredView(blurredView);
    
    //创建adapter
    GuideAdapter adapter = new GuideAdapter(getSupportFragmentManager());
    //设置viewpager缓存页数,默认的缓存一页,因为引导页共有4页,
    //所以设置缓存3页,这样所以page在滑动过程中不会重新创建
    viewpager.setOffscreenPageLimit(3);
    viewpager.setAdapter(adapter);
    viewpager.setPageTransformer(true, new HKTransformer());
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
	// If the available screen size is that of an average tablet (as defined
	// in the Android documentation) then allow the screen to rotate
	if(getResources().getBoolean(R.bool.lock_orientation)){
		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
	}
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_loanhistory);
	mFragments = new Fragment[2];
	Bundle extras = getIntent().getExtras();
	mDB = new DatabaseManager(this);
	if(extras.getBoolean(IS_FOR_ITEM)){
		isForItem = true;
		mFragments[0] = new ItemDetailsFragment();
		mFragments[1] = new ItemHistoryFragment();
		Log.d(TAG, "Looking up item id: "+extras.getInt(ITEM_ID));
		mItem = mDB.getItemByID(extras.getInt(ITEM_ID));
	} else {
		mFragments[0] = new PersonDetailsFragment();
		mFragments[1] = new PersonHistoryFragment();
		Log.d(TAG, "Looking up person id: "+extras.getInt(PERSON_ID));
		mPerson = mDB.getPersonByID(extras.getInt(PERSON_ID));
	}
	// Set up the action bar.
	final ActionBar actionBar = getActionBar();
	actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
	// Create the adapter that will return a fragment for each of the three
	// primary sections of the app.
	mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
	// Set up the ViewPager with the sections adapter.
	mViewPager = (ViewPager) findViewById(R.id.loanhistory_viewpager);
	mViewPager.setAdapter(mSectionsPagerAdapter);
	// Set the ViewPager animation
	mViewPager.setPageTransformer(true, new DepthPageTransformer());
	// When swiping between different sections, select the corresponding
	// tab. We can also use ActionBar.Tab#select() to do this if we have
	// a reference to the Tab.
	mViewPager
	.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
		@Override
		public void onPageSelected(int position) {
			actionBar.setSelectedNavigationItem(position);
		}
	});

	// For each of the sections in the app, add a tab to the action bar.
	for (int i = 0; i < mSectionsPagerAdapter.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 callback (listener) for when
		// this tab is selected.
		actionBar.addTab(actionBar.newTab()
				.setText(mSectionsPagerAdapter.getPageTitle(i))
				.setTabListener(this));
	}
	mContext = this;
}
 

private void init(AttributeSet attrs) {
  /* get custom attrs */
  TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.LunarView);
  monthBackgroundColor =
      a.getColor(R.styleable.LunarView_monthBackgroundColor, monthBackgroundColor);
  weekLabelBackgroundColor =
      a.getColor(R.styleable.LunarView_monthBackgroundColor, weekLabelBackgroundColor);
  solarTextColor = a.getColor(R.styleable.LunarView_solarTextColor, solarTextColor);
  lunarTextColor = a.getColor(R.styleable.LunarView_lunarTextColor, lunarTextColor);
  hightlistColor = a.getColor(R.styleable.LunarView_highlightColor, hightlistColor);
  uncheckableColor = a.getColor(R.styleable.LunarView_uncheckableColor, uncheckableColor);
  todayBackground = a.getDrawable(R.styleable.LunarView_todayBackground);
  checkedDayBackgroundColor =
      a.getColor(R.styleable.LunarView_checkedDayBackgroundColor, checkedDayBackgroundColor);
  shouldPickOnMonthChange =
      a.getBoolean(R.styleable.LunarView_shouldPickOnMonthChange, shouldPickOnMonthChange);
  a.recycle();

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    /* if we're on good Android versions, turn off clipping for cool effects */
    setClipToPadding(false);
    setClipChildren(false);
  } else {
	/* old Android does not like _not_ clipping view pagers, we need to clip */
    setClipChildren(true);
    setClipToPadding(true);
  }

/* set the orientation to vertical */
  setOrientation(VERTICAL);

  weekLabelView = new WeekLabelView(getContext());
  weekLabelView.setBackgroundColor(weekLabelBackgroundColor);
  addView(weekLabelView);

  viewPager = new ViewPager(getContext());
  viewPager.setOffscreenPageLimit(1);
  addView(viewPager);

  monthPagerAdapter = new MonthPagerAdapter(getContext(), this);
  viewPager.setAdapter(monthPagerAdapter);
  viewPager.addOnPageChangeListener(mPageListener);
  viewPager.setCurrentItem(monthPagerAdapter.getIndexOfCurrentMonth());
  viewPager.setPageTransformer(false, new ViewPager.PageTransformer() {
    @Override public void transformPage(View page, float position) {
      page.setAlpha(1 - Math.abs(position));
    }
  });
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    HomeActivityPermissionsDispatcher.initWithPermissionCheck(this);
    mViewPager = (ViewPager) findViewById(R.id.viewPager);
    mCardAdapter = new CardPagerAdapter();
    mCardAdapter.addCardItem(new CardItem(R.string.title_1, R.string.content_text_1));
    mCardAdapter.addCardItem(new CardItem(R.string.title_2, R.string.content_text_2));
    mCardAdapter.addCardItem(new CardItem(R.string.title_3, R.string.content_text_3));
    mCardAdapter.addCardItem(new CardItem(R.string.title_4, R.string.content_text_4));
    mCardAdapter.addCardItem(new CardItem(R.string.title_5, R.string.content_text_5));
    mCardAdapter.addCardItem(new CardItem(R.string.title_6, R.string.content_text_6));

    planeMode= (CheckBox) findViewById(R.id.plane_mode);

    mCardAdapter.setOnClickCallback(new CardPagerAdapter.OnClickCallback() {
        @Override
        public void onClick(int position) {
            videoHotspotPath=null;
            switch (position){
                case 0:
                    //filePath= "gz256.mp4";
                    //mimeType= MimeType.ASSETS | MimeType.VIDEO;
                    filePath= "android.resource://" + getPackageName() + "/" + R.raw.demo_video;
                    mimeType= MimeType.RAW | MimeType.VIDEO;
                    break;
                case 1:
                    Intent intent=new Intent(HomeActivity.this, FilePickerActivity.class);
                    intent.putExtra(FilePickerActivity.ARG_FILTER, Pattern.compile("(.*\\.mp4$)||(.*\\.avi$)||(.*\\.wmv$)"));
                    startActivityForResult(intent, 1);
                    return;
                case 2:
                    filePath="images/vr_cinema.jpg";
                    videoHotspotPath="android.resource://" + getPackageName() + "/" + R.raw.demo_video;
                    mimeType= MimeType.ASSETS | MimeType.PICTURE;
                    break;
                case 3:
                    //filePath= "android.resource://" + getPackageName() + "/" + R.raw.vr_cinema;
                    //mimeType= MimeType.RAW | MimeType.PICTURE;

                    //mimeType= MimeType.BITMAP | MimeType.PICTURE;

                    filePath="images/texture_360_n.jpg";
                    mimeType= MimeType.ASSETS | MimeType.PICTURE;
                    break;
                case 4:
                    filePath="http://cache.utovr.com/201508270528174780.m3u8";
                    mimeType= MimeType.ONLINE | MimeType.VIDEO;
                    break;
                case 5:
                    if(flag) throw new GirlFriendNotFoundException();
                    else {
                        Toast.makeText(HomeActivity.this,"再点会点坏的哦~",Toast.LENGTH_LONG).show();
                        flag=true;
                    }
                    return;
            }
            planeModeEnabled=planeMode.isChecked();
            start();
        }
    });
    mCardShadowTransformer = new ShadowTransformer(mViewPager, mCardAdapter);

    mViewPager.setAdapter(mCardAdapter);
    mViewPager.setPageTransformer(false, mCardShadowTransformer);

    mViewPager.setOffscreenPageLimit(3);

    mCardShadowTransformer.enableScaling(true);
}
 

@Override
protected final void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setTheme(R.style.IntroActivity_Theme);

    // Set the content view
    setContentView(R.layout.intro);

    // Set up the progress LinearLayout
    mProgressLayout = (LinearLayout) findViewById(R.id.progress_layout);

    // Set up the back button
    mSkipButton = (Button) findViewById(R.id.skip_button);
    mSkipButton.setOnClickListener(mOnSkipClickListener);

    // Set up the next button
    mNextButton = (NextDoneButton) findViewById(R.id.next_button);
    mNextButton.setOnClickListener(mOnNextClickListener);

    // Set up the ViewPager
    mViewPager = (ViewPager) findViewById(R.id.view_pager);

    // Set up the PagerAdapter
    mPagerAdapter = new IntroScreenPagerAdapter(getSupportFragmentManager());

    // Add the OnPageChangeListener
    mViewPager.addOnPageChangeListener(mOnPageChangeListener);

    // Set a custom animation PageTransformer
    mViewPager.setPageTransformer(false, new CustomAnimationPageTransformer());

    // Call the initialize method to add intro screens
    // and set up the selected styles
    initialize();

    // Set up the progress layout with circles
    setupProgressLayout();

    // Set the ViewPager adapter
    mViewPager.setAdapter(mPagerAdapter);

    // Required in order to get a callback in onPageSelected
    mViewPager.setCurrentItem(0);
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    vp = (ViewPager)findViewById(R.id.vp);

    WelcomePagerAdapter adapter = new WelcomePagerAdapter(getSupportFragmentManager());
    vp.setAdapter(adapter);

    vp.setPageTransformer(true, new WelcompagerTransformer());

}