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How to create toolbar tabs using ViewPager in material design

Does anyone know anything about how tabs execute in API 21 / AppCompat Toolbar?

Many of the materials and articles that I found were old. They used old methods with ActionBar, which now do not work. At the moment, I just created a toolbar and have no idea about the toolbar tabs. So can anyone give examples or articles on how to make toolbar tabs using the viewpager?

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Does anyone know anything about how to make tabs in the API 21 / AppCompat Toolbar?

No Toolbar tabs. The tab template in the action bar was deprecated using Material Design, and when they created the Toolbar , they reset the tabs.

So can anyone give examples or articles on how to make toolbar tabs using the viewpager.

No Toolbar tabs.

You can use PagerTabStrip , TabPageIndicator from the ViewPagerIndicator library , PagerSlidingTabStrip , etc. for ViewPager tabs.

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1. Copy SlidingTabLayout.java from https://developer.android.com/samples/SlidingTabsColors/src/com.example.android.common/view/SlidingTabLayout.html and paste it into your package.

MainActivity.java

 public class MainActivity extends ActionBarActivity { static final String LOG_TAG = "SlidingTabsBasicFragment"; private SlidingTabLayout mSlidingTabLayout; private ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_sample); Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar); mViewPager = (ViewPager) findViewById(R.id.viewpager); mViewPager.setAdapter(new SamplePagerAdapter()); mSlidingTabLayout = (SlidingTabLayout) findViewById(R.id.sliding_tabs); mSlidingTabLayout.setViewPager(mViewPager); /* * FragmentTransaction transaction = * getSupportFragmentManager().beginTransaction(); * SlidingTabsBasicFragment fragment = new SlidingTabsBasicFragment(); * transaction.replace(R.id.sample_content_fragment, fragment); * transaction.commit(); */ } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } class SamplePagerAdapter extends PagerAdapter { /** * @return the number of pages to display */ @Override public int getCount() { return 5; } /** * @return true if the value returned from * {@link #instantiateItem(ViewGroup, int)} is the same object * as the {@link View} added to the {@link ViewPager}. */ @Override public boolean isViewFromObject(View view, Object o) { return o == view; } // BEGIN_INCLUDE (pageradapter_getpagetitle) /** * Return the title of the item at {@code position}. This is important * as what this method returns is what is displayed in the * {@link SlidingTabLayout}. * <p> * Here we construct one using the position value, but for real * application the title should refer to the item contents. */ @Override public CharSequence getPageTitle(int position) { return "Item " + (position + 1); } // END_INCLUDE (pageradapter_getpagetitle) /** * Instantiate the {@link View} which should be displayed at * {@code position}. Here we inflate a layout from the apps resources * and then change the text view to signify the position. */ @Override public Object instantiateItem(ViewGroup container, int position) { // Inflate a new layout from our resources View view = getLayoutInflater().inflate(R.layout.pager_item, container, false); // Add the newly created View to the ViewPager container.addView(view); // Retrieve a TextView from the inflated View, and update it text TextView title = (TextView) view.findViewById(R.id.item_title); title.setText(String.valueOf(position + 1)); Log.i(LOG_TAG, "instantiateItem() [position: " + position + "]"); // Return the View return view; } /** * Destroy the item from the {@link ViewPager}. In our case this is * simply removing the {@link View}. */ @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); Log.i(LOG_TAG, "destroyItem() [position: " + position + "]"); } }

}

fragment_sample.xml

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <android.support.v7.widget.Toolbar xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/my_awesome_toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="?attr/actionBarSize" app:theme="@style/ThemeOverlay.AppCompat.ActionBar"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <com.example.android.common.view.SlidingTabLayout android:id="@+id/sliding_tabs" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> </android.support.v7.widget.Toolbar> <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="0px" android:layout_weight="1" android:background="@android:color/white" /> </LinearLayout>

Pager_item.xml

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:gravity="center"> <TextView android:id="@+id/item_subtitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="Page:"/> <TextView android:id="@+id/item_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="80sp" /> </LinearLayout>
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I created a library that could help you with this layout, but I did not use the toolbar (I did this with RelativeLayout).

I just created a custom view that extends the RelativeLayout and inside that I placed all the elements (LinearLayout for the toolbar, View for the marker and ViewPager).

Here's the CustomView class:

 public class ToolbarPagerView extends RelativeLayout { private static final @IdRes int MENU_ID = 0x0042; private static final @IdRes int PAGER_ID = 0x0666; private int totalPages; private int currentPage; private @ColorInt int toolbarColor; private @ColorInt int itemColor; private ToolbarPagerAdapter toolbarPagerAdapter; private LinearLayout menu; private ViewPager viewPager; private View marker; public ToolbarPagerView(Context context, AttributeSet attrs) { super(context, attrs); initialize(context, attrs); } public ToolbarPagerView(Context context, AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr, 0); initialize(context, attrs); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) public ToolbarPagerView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); initialize(context, attrs); } private void initialize(Context context, AttributeSet attrs) { /* RETRIEVE MAX PAGES */ TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.ToolbarPagerView); try { toolbarColor = attributes.getInteger(R.styleable.ToolbarPagerView_toolbar_color, R.color.color_primary_dark); itemColor = attributes.getInteger(R.styleable.ToolbarPagerView_item_color, R.color.color_accent); } finally { attributes.recycle(); setViews(context); } } private void setViews(Context context) { /* MENU */ menu = new LinearLayout(context); menu.setId(MENU_ID); menu.setOrientation(LinearLayout.HORIZONTAL); menu.setBackgroundColor(toolbarColor); menu.setGravity(Gravity.CENTER); addView(menu); LayoutParams menuParams = (LayoutParams) menu.getLayoutParams(); TypedArray toolbarAttributes = context.getTheme().obtainStyledAttributes(new int[] { android.R.attr.actionBarSize }); menuParams.width = ViewGroup.LayoutParams.MATCH_PARENT; menuParams.height = (int) toolbarAttributes.getDimension(0, 0); /* PAGES */ viewPager = new ViewPager(context); viewPager.setId(PAGER_ID); addView(viewPager); LayoutParams pagerParams = (LayoutParams) viewPager.getLayoutParams(); pagerParams.width = ViewGroup.LayoutParams.MATCH_PARENT; pagerParams.height = ViewGroup.LayoutParams.MATCH_PARENT; pagerParams.addRule(BELOW, MENU_ID); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { marker.setX((positionOffsetPixels / totalPages) + (marker.getMeasuredWidth() * position)); } @Override public void onPageSelected(int position) { currentPage = position; } @Override public void onPageScrollStateChanged(int state) { } }); /* SHADOW */ View shadow = new View(context); shadow.setBackgroundResource(R.drawable.shadow); addView(shadow); LayoutParams shadowParams = (LayoutParams) shadow.getLayoutParams(); shadowParams.width = ViewGroup.LayoutParams.MATCH_PARENT; shadowParams.height = (int) context.getResources().getDimension(R.dimen.shadow_height); shadowParams.addRule(BELOW, MENU_ID); /* MARKER */ marker = new View(context); marker.setBackgroundColor(itemColor); addView(marker); LayoutParams markerParams = (LayoutParams) marker.getLayoutParams(); markerParams.height = (int) context.getResources().getDimension(R.dimen.marker_height); markerParams.addRule(ALIGN_BOTTOM, MENU_ID); getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) { getViewTreeObserver().removeGlobalOnLayoutListener(this); } else { getViewTreeObserver().removeOnGlobalLayoutListener(this); } LayoutParams markerParams = (LayoutParams) marker.getLayoutParams(); markerParams.width = menu.getMeasuredWidth() / totalPages; marker.setX(currentPage * markerParams.width); } }); } public void setAdapter(FragmentManager fragmentManager) { toolbarPagerAdapter = new ToolbarPagerAdapter(fragmentManager); viewPager.setAdapter(toolbarPagerAdapter); } public void addPage(Fragment fragment) { addPage(R.mipmap.ic_star, fragment); } public void addPage(@DrawableRes int icon, Fragment fragment) { ImageView item = new ImageView(getContext()); item.setImageResource(icon); item.setTag(totalPages); item.setColorFilter(itemColor); TypedArray selectAttributes = getContext().obtainStyledAttributes(new int[]{android.R.attr.selectableItemBackground}); if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) { item.setBackgroundDrawable(selectAttributes.getDrawable(0)); } else { item.setBackground(selectAttributes.getDrawable(0)); } menu.setWeightSum(++totalPages); menu.addView(item); item.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Integer itemPosition = (Integer) v.getTag(); viewPager.setCurrentItem(itemPosition); } }); LinearLayout.LayoutParams itemParams = (LinearLayout.LayoutParams) item.getLayoutParams(); itemParams.width = ViewGroup.LayoutParams.MATCH_PARENT; itemParams.height = ViewGroup.LayoutParams.MATCH_PARENT; itemParams.weight = 1; toolbarPagerAdapter.addPage(fragment); } }

And here is the CustomAdapter class:

 public class ToolbarPagerAdapter extends FragmentPagerAdapter { private static final String PAGE_DUPLICATED_MESSAGE = "You're trying to add a duplicated page, are you doublethinking? - Orwell, George / Index: "; private ArrayList<Fragment> pages; public ToolbarPagerAdapter(FragmentManager fm) { super(fm); pages = new ArrayList<>(); } public void addPage(Fragment fragment) { pages.add(fragment); notifyDataSetChanged(); } @Override public Fragment getItem(int position) { return pages.get(position); } @Override public int getCount() { return pages.size(); } }

And you can find here a demo project that I created based on this solution:

https://github.com/PedroOkawa/toolbar-pager-view

Take a look at the code if you want, I hope it helps you.

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Source: https://habr.com/ru/post/1209399/

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