androidx.viewpager.widget.ViewPager Java Examples

/**
 * Set the page count for the view pager.
 *
 * @param pageCount The page count to be set.
 * @param onPageChangeListener The page change listener to receive page change events.
 */
public void setPageCount(int pageCount,
        @Nullable ViewPager.OnPageChangeListener onPageChangeListener) {
    this.mPageCount = pageCount;

    if (mViewPager == null) {
        addView(LayoutInflater.from(getContext()).inflate(
                R.layout.adm_view_pager, this, false));
        mViewPager = findViewById(R.id.adm_view_pager);
    }

    mViewPager.setAdapter(new ViewPagerAdapter(pageCount));
    mViewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
        @Override
        public void onPageScrolled(int position,
                float positionOffset, int positionOffsetPixels) {
            super.onPageScrolled(position, positionOffset, positionOffsetPixels);

            setProgress((position + positionOffset) / (mPageCount - 1));
        }
    });

    if (mViewPager.getAdapter() != null) {
        mViewPager.getAdapter().notifyDataSetChanged();
    }
}
 

private void initializeResources() {
  ViewPager viewPager = ViewUtil.findById(this, R.id.giphy_pager);
  TabLayout tabLayout = ViewUtil.findById(this, R.id.tab_layout);

  this.gifFragment     = new GiphyGifFragment();
  this.stickerFragment = new GiphyStickerFragment();
  this.forMms          = getIntent().getBooleanExtra(EXTRA_IS_MMS, false);

  gifFragment.setClickListener(this);
  stickerFragment.setClickListener(this);

  viewPager.setAdapter(new GiphyFragmentPagerAdapter(this, getSupportFragmentManager(),
                                                     gifFragment, stickerFragment));
  tabLayout.setupWithViewPager(viewPager);
  tabLayout.setBackgroundColor(getConversationColor());
}
 

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    mCurrentPage = position;
    mPositionOffset = positionOffset;
    if (mFades) {
        if (positionOffsetPixels > 0) {
            removeCallbacks(mFadeRunnable);
            mPaint.setAlpha(0xFF);
        } else if (mScrollState != ViewPager.SCROLL_STATE_DRAGGING) {
            postDelayed(mFadeRunnable, mFadeDelay);
        }
    }
    invalidate();

    if (mListener != null) {
        mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
    }
}
 

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

    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    PageNavigationView pageBottomTabLayout = findViewById(tab);

    mNavigationController = pageBottomTabLayout.material()
            .addItem(R.drawable.ic_restore_teal_24dp, "Recents")
            .addItem(R.drawable.ic_favorite_teal_24dp, "Favorites")
            .addItem(R.drawable.ic_nearby_teal_24dp, "Nearby")
            .build();

    ViewPager viewPager = findViewById(R.id.viewPager);
    viewPager.setAdapter(new TestViewPagerAdapter(getSupportFragmentManager()));

    mNavigationController.setupWithViewPager(viewPager);
}
 

@Override
protected 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 activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);
    //mViewPager.setCurrentItem(7);// set to a specific page in the pager.


}
 

/**
 * 收集 frg 页面
 */
private void collectFrgs(View childView) {
    if (childView.getTag(R.id.fragment_root_view) != null) {
        Object fragment = childView.getTag(R.id.fragment_root_view);
        if (FrgUtil.isVisible(fragment)) {
            int position = -1;
            if (childView.getParent() != null && childView.getParent() instanceof ViewPager) {
                ViewPager viewPager = (ViewPager) childView.getParent();
                position = viewPager.getCurrentItem();
            }
            int hashCode = fragment.hashCode();
            // 加上 frg 在 ViewPager 中的位置
            hashCode = hashCode + position;
            // 把当前页面中 frg 的 hashcode 存起来
            currentFrgs.append(hashCode, fragment);
            Log.i("yyyy", " 遍历到了一个 fragment 页面：(" + hashCode + ")" + fragment.getClass().getSimpleName());
        }
    }
}
 

/**
 * Initialize view pager fields so that we can access them via reflection.
 */
private static void initializeViewPagerFields() {
    if (F_VIEW_PAGER_EDGE_GLOW_LEFT != null
            && F_VIEW_PAGER_EDGE_GLOW_RIGHT != null) {
        F_VIEW_PAGER_EDGE_GLOW_LEFT.setAccessible(true);
        F_VIEW_PAGER_EDGE_GLOW_RIGHT.setAccessible(true);

        return;
    }

    Class<?> clazz = ViewPager.class;
    for (Field field : clazz.getDeclaredFields()) {
        switch (field.getName()) {
            case "mLeftEdge":
                field.setAccessible(true);
                F_VIEW_PAGER_EDGE_GLOW_LEFT = field;
                break;
            case "mRightEdge":
                field.setAccessible(true);
                F_VIEW_PAGER_EDGE_GLOW_RIGHT = field;
                break;
        }
    }
}
 

private void set() {
    Button nextBtn = findViewById(R.id.fragment_linking_help_next);
    Button preBtn = findViewById(R.id.fragment_linking_help_pre);
    ViewPager viewPager =  findViewById(R.id.viewPager);
    if (viewPager != null && nextBtn != null && preBtn != null) {
        int position = viewPager.getCurrentItem();
        if (position == 0) {
            preBtn.setVisibility(View.GONE);
        } else {
            preBtn.setVisibility(View.VISIBLE);
        }
        if (position == HELP_RES_ID[mScreenId].length - 1) {
            nextBtn.setVisibility(View.GONE);
        } else {
            nextBtn.setVisibility(View.VISIBLE);
        }
    }
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_view_pager_nested);
    // Create the adapter that will return a fragment for each of the three
    // primary sections of the activity.
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

}
 

private void initializeViewPager() {
    sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(sectionsPagerAdapter);
    viewPager.setOffscreenPageLimit(2);
    tabLayout.setupWithViewPager(viewPager);

    viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            if (isInLazyMode) {
                if (viewPager.getCurrentItem() == 0) {
                    sectionsPagerAdapter.resumeLazyMode();
                } else {
                    sectionsPagerAdapter.pauseLazyMode();
                }
            }

            if (position == 0) {
                unlockSwipeRightToGoBack();
            } else {
                lockSwipeRightToGoBack();
            }
        }
    });
}
 

private void setupTabs() {
    ViewPager viewPager = findViewById(R.id.pager);
    TabLayout normalTabs = findViewById(R.id.tabs_normal);
    normalTabs.setupWithViewPager(viewPager, true);
    TabLayout compactTabs = findViewById(R.id.tabs_compact);
    compactTabs.setupWithViewPager(viewPager, true);
    Toolbar toolbar = findViewById(R.id.toolbar);
    if (SP.getBoolean("short_tabtitles", false)) {
        normalTabs.setVisibility(View.GONE);
        compactTabs.setVisibility(View.VISIBLE);
        toolbar.setLayoutParams(new LinearLayout.LayoutParams(Toolbar.LayoutParams.MATCH_PARENT, (int) getResources().getDimension(R.dimen.compact_height)));
    } else {
        normalTabs.setVisibility(View.VISIBLE);
        compactTabs.setVisibility(View.GONE);
        TypedValue typedValue = new TypedValue();
        if (getTheme().resolveAttribute(R.attr.actionBarSize, typedValue, true)) {
            toolbar.setLayoutParams(new LinearLayout.LayoutParams(Toolbar.LayoutParams.MATCH_PARENT,
                    TypedValue.complexToDimensionPixelSize(typedValue.data, getResources().getDisplayMetrics())));
        }
    }
}
 

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_statistics, container, false);
    ActionBar actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
    if (actionBar != null) {
        //actionBar.setSubtitle(R.string.action_main);
        actionBar.setDisplayHomeAsUpEnabled(true);
    }
    container.removeAllViews();

    ViewPager viewPager = (ViewPager) view.findViewById(R.id.pager);
    setupViewPager(viewPager);

    TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);

    setHasOptionsMenu(true);
    return view;
}
 

private void initViewPager() {
    listPagerViews = new ArrayList<>();

    listPagerViews.add(new Frg_app_1());
    listPagerViews.add(new Frg_app_2());
    listPagerViews.add(new Frg_app_3());
    ViewPager viewPager = findViewById(R.id.vp_app_frg);
    pagerAdapter = new FragmentPagerAdapter(getFragmentManager()) {
        @Override
        public int getCount() {
            return listPagerViews.size();
        }

        @Override
        public Fragment getItem(int i) {
            return listPagerViews.get(i);
        }
    };
    viewPager.setAdapter(pagerAdapter);
}
 

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

    mFragmentList.add(new LinearLayoutFragment());
    mFragmentList.add(new LinearLayoutFragment());

    tableLayout = (TabLayout) findViewById(R.id.tableLayout);
    viewPager = (ViewPager) findViewById(R.id.viewPager);

    mAdapter = new FragmentAdapter(getSupportFragmentManager());
    viewPager.setAdapter(mAdapter);
    tableLayout.setupWithViewPager(viewPager);
    tableLayout.setTabMode(TabLayout.MODE_FIXED);
}
 

@Override
public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_material_up_concept);

	TabLayout tabLayout = (TabLayout) findViewById(R.id.materialup_tabs);
	ViewPager viewPager  = (ViewPager) findViewById(R.id.materialup_viewpager);
	AppBarLayout appbarLayout = (AppBarLayout) findViewById(R.id.materialup_appbar);
	mProfileImage = (ImageView) findViewById(R.id.materialup_profile_image);

	Toolbar toolbar = (Toolbar) findViewById(R.id.materialup_toolbar);
	toolbar.setNavigationOnClickListener(new View.OnClickListener() {
		@Override public void onClick(View v) {
			onBackPressed();
		}
	});

	appbarLayout.addOnOffsetChangedListener(this);
	mMaxScrollSize = appbarLayout.getTotalScrollRange();

	viewPager.setAdapter(new TabsAdapter(getSupportFragmentManager()));
	tabLayout.setupWithViewPager(viewPager);
}
 

/**
 * 控件绑定
 */
@Override
protected void bindView() {
    mFragmentList = createTabFragments();
    mainFragmentPageAdapter = new MainFragmentPageAdapter(getSupportFragmentManager());
    mHomeViewPager.setAdapter(mainFragmentPageAdapter);
    mHomeViewPager.setOffscreenPageLimit(3);
    mHomeViewPager.addOnPageChangeListener((ViewPager.OnPageChangeListener)this);
    mHomeViewPager.setCurrentItem(0, false);
    sivBookshelf.setChecked(true);

}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_demo_fragment);
    setTitle(getClass().getSimpleName());
    setActionBarBack();

    for(int i = 0; i < 3; i++){
        fragmentList.add(DemoFragment.newInstance(i));
    }
    ViewPager vp = (ViewPager) findViewById(R.id.vp);
    vp.setOffscreenPageLimit(1);
    vp.setAdapter(new DemoAdapter(getSupportFragmentManager()));
}
 

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();

    if (mViewPager == null) {
        // If we don't have a ViewPager already, check if our parent is a ViewPager to
        // setup with it automatically
        final ViewParent vp = getParent();
        if (vp instanceof ViewPager) {
            // If we have a ViewPager parent and we've been added as part of its decor, let's
            // assume that we should automatically setup to display any titles
            setupWithViewPager((ViewPager) vp, true, true);
        }
    }
}
 

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

	// Get the various handles of view and layouts that is part of this view
	streamerImage 			= (ImageView) findViewById(R.id.profileImageView);
	additionalInfoLayout 	= (LinearLayout) findViewById(R.id.additional_info_wrapper);
	streamerInfoName 		= (TextView) findViewById(R.id.twitch_name);
	streamerViewers 		= (TextView) findViewById(R.id.txt_viewers);
	streamerFollowers 		= (TextView) findViewById(R.id.txt_followers);
	toolbar 				= (Toolbar) findViewById(R.id.StreamerInfo_Toolbar);
	additionalToolbar 		= (Toolbar) findViewById(R.id.additional_toolbar);
	mViewPager				= (ViewPager) findViewById(R.id.container);
	mTabs					= (TabLayout) findViewById(R.id.tabs);
	mAppBar					= (AppBarLayout) findViewById(R.id.appbar);
	mFab 					= (FloatingActionButton) findViewById(R.id.fab);

	setSupportActionBar(toolbar);
	if (getSupportActionBar() != null) {
		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
	}

	// Get the StreamerInfo object sent with the intent to open this activity
	Intent intent = getIntent();
	info = intent.getParcelableExtra(getResources().getString(R.string.channel_info_intent_object));

	streamerInfoName		.setText(info.getDisplayName());
	streamerFollowers		.setText(getReadableInt(info.getFollowers()));
	streamerViewers			.setText(getReadableInt(info.getViews()));

	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
		streamerImage.setTransitionName(getString(R.string.streamerInfo_transition));
	}

	setUpTabs();
	initStreamerImageAndColors();
	initiateFAB();
}
 

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new HomeFragment(), "Home");
    adapter.addFragment(new HomeFragment(), "Games");
    adapter.addFragment(new HomeFragment(), "Movies");
    adapter.addFragment(new HomeFragment(), "Books");
    adapter.addFragment(new HomeFragment(), "Music");
    viewPager.setAdapter(adapter);
}
 

/**
 * You must call this AFTER setting the Adapter for the ViewPager, or it won't display the right amount of points.
 *
 * @param viewPager
 */
public void setViewPager(ViewPager viewPager) {
    this.viewPager = viewPager;
    viewPager.addOnPageChangeListener(this);
    size = viewPager.getAdapter().getCount();
    invalidate();
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mFragmentList.add(new TabFragment(titles[0], colors[0]));
    mFragmentList.add(new TabFragment(titles[1], colors[1]));
    mFragmentList.add(new TabFragment(titles[2], colors[2]));
    mFragmentList.add(new TabFragment(titles[3], colors[3]));
    ViewPager viewPager = findViewById(R.id.viewPager);
    FragmentStatePagerAdapter adapter = new FragmentStatePagerAdapter(getSupportFragmentManager()) {
        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }
    };
    viewPager.setAdapter(adapter);
    TabLayout tabLayout = findViewById(R.id.tabLayout);
    tabLayout.setupWithViewPager(viewPager);
    tabBubbleAnimator = new TabBubbleAnimator(tabLayout);
    tabBubbleAnimator.addTabItem(titles[0], R.drawable.ic_grid, colors[0]);
    tabBubbleAnimator.addTabItem(titles[1], R.drawable.ic_clock,colors[1]);
    tabBubbleAnimator.addTabItem(titles[2], R.drawable.ic_folder, colors[2]);
    tabBubbleAnimator.addTabItem(titles[3], R.drawable.ic_menu, colors[3]);
    tabBubbleAnimator.setUnselectedColorId(Color.BLACK);
    tabBubbleAnimator.highLightTab(0);
    viewPager.addOnPageChangeListener(tabBubbleAnimator);
}
 

@Override
public void setViewPager(ViewPager view) {
    if (mViewPager == view) {
        return;
    }
    if (mViewPager != null) {
        mViewPager.removeOnPageChangeListener(this);
    }
    if (view.getAdapter() == null) {
        throw new IllegalStateException("ViewPager does not have adapter instance.");
    }
    mViewPager = view;
    mViewPager.addOnPageChangeListener(this);
    invalidate();
}
 

private void initializeViewPager() {
    sectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(sectionsPagerAdapter);
    viewPager.setOffscreenPageLimit(2);
    tabLayout.setupWithViewPager(viewPager);

    viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
        @Override
        public void onPageSelected(int position) {
            if (isInLazyMode) {
                if (viewPager.getCurrentItem() == 0) {
                    sectionsPagerAdapter.resumeLazyMode();
                } else {
                    sectionsPagerAdapter.pauseLazyMode();
                }
            }
            if (position == 0) {
                unlockSwipeRightToGoBack();
            } else {
                lockSwipeRightToGoBack();
            }
            sectionsPagerAdapter.displaySortTypeInToolbar();
        }
    });

    if (mAccessToken != null && mMessageFullname != null) {
        ReadMessage.readMessage(mOauthRetrofit, mAccessToken, mMessageFullname, new ReadMessage.ReadMessageListener() {
            @Override
            public void readSuccess() {
                mMessageFullname = null;
            }

            @Override
            public void readFailed() {

            }
        });
    }
}
 

@Override
public void onPageSelected(int position) {
    if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
        mCurrentPage = position;
        mSnapPage = position;
        invalidate();
    }

    if (mListener != null) {
        mListener.onPageSelected(position);
    }
}
 

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.map_in_pager_demo);
    mAdapter = new MyAdapter(getSupportFragmentManager());

    mPager = (ViewPager) findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);

    // This is required to avoid a black flash when the map is loaded.  The flash is due
    // to the use of a SurfaceView as the underlying view of the map.
    mPager.requestTransparentRegion(mPager);
}
 

@Override
public void onPageSelected(int position) {
    if (mView instanceof TabStripView)
        ((TabStripView) mView).onViewPagerItemSelected(position);
    else if (mView instanceof TabStripViewGroup)
        ((TabStripViewGroup) mView).onViewPagerItemSelected(position);
    if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
        mPosition = position;
        updateView(false);
    }
}
 

@Override
public void onPageScrollStateChanged(int state) {
    if (state == ViewPager.SCROLL_STATE_IDLE) {
        scrollToChild(pager.getCurrentItem(), 0);
    }
    if (delegatePageListener != null) {
        delegatePageListener.onPageScrollStateChanged(state);
    }
}
 

@Override
public void onPageSelected(int position) {
    if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
        mCurrentPage = position;
        mSnapPage = position;
        invalidate();
    }

    if (mListener != null) {
        mListener.onPageSelected(position);
    }
}
 

/**
 * Testing initialization
 */
@Test
public void initializeTest() {
    CourseTabsDashboardFragment fragment = CourseTabsDashboardFragment.newInstance(getCourseData(), "testsCourseId", Screen.COURSE_DASHBOARD);
    SupportFragmentTestUtil.startVisibleFragment(fragment, RoboFragmentActivity.class, android.R.id.content);
    View view = fragment.getView();
    assertNotNull(view);

    View viewPager = view.findViewById(R.id.viewPager);
    assertNotNull(viewPager);
    assertThat(viewPager).isInstanceOf(ViewPager.class);
}