Develop Reference

how to change tablayout indicator color by index in android?

I have a ViewPager2 in my activity and TabLayout attached to this viewpager2 as below:
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
app:tabIndicatorColor="#color/colorPrimary"
app:tabMode="fixed"
android:layout_height="2dp" />
<androidx.viewpager2.widget.ViewPager2
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/vpager"/>
I have attached the TabLayout to ViewPager as below
new TabLayoutMediator(tabLayout, vpager,
new TabLayoutMediator.TabConfigurationStrategy() {
#Override public void onConfigureTab(#NonNull TabLayout.Tab tab, int position) {
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}).attach();
My target is to keep the indicator color selected in previous tab seeing by the user, so if the user go to next tab, the previous one must be coloring as the selected, like the images below
The images show the first indicator is selected and keep it selected when going to the next fragment, so it can be like a progress bar.
I choose to set the indicator color programmatically by index, how?

The TabLayout indicator color functionality is limited the current selected tab of the TabLayout; so it affects only the current tab; not any other tab.
Instead, you can use a ProgressBar for that and set the progress whenever the ViewPager changes the page:
Layout
<ProgressBar
android:id="#+id/progress_bar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/intro_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
Behavior
ProgressBar progressBar = findViewById(R.id.progress_bar);
progressBar.max = pageCount // Change pageCount to the number of pages in your ViewPager2
mViewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
progressBar.setProgress(position + 1);
}
#Override
public void onPageSelected(int position) {
progressBar.setProgress(position + 1);
}
});

How use TabItem through TabLayout in Android

Recently google added android.support.design.widget.TabItem in supportDesign as documentation said:
TabItem is a special 'view' which allows you to declare tab items for
a TabLayout within a layout. This view is not actually added to
TabLayout, it is just a dummy which allows setting of a tab items's
text, icon and custom layout.
But when I add TabItems to my TabLayout:
<android.support.design.widget.TabLayout
android:layout_height="wrap_content"
android:layout_width="match_parent">
<android.support.design.widget.TabItem
android:text="#string/tab_text"/>
<android.support.design.widget.TabItem
android:icon="#drawable/ic_android"/>
</android.support.design.widget.TabLayout>
Nothing displayed (in fact place of Tabs exist but Icon/Text not). Does any one knows How to use TabItem through xml?

Based on this answer, TabItem with tabLayout.setupViewPager have conflict and Icons disappear. To make it work you should implement two methods like following and avoid using setupViewPager method:
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
tabLayout.getTabAt(position).select();
}
#Override
public void onPageScrollStateChanged(int state) {
}
});

you should set these attributes for the TabItems
android:layout_width
android:layout_height
Cheers

Viewpager with Toolbar

I have a bar which includes menu. Im using viewbar and i need to show my bar every single page.
So thats why i created my bar in MainActivity and viewpager_layout.xml
If i use same fragment layout every page its working well but when i try change layout its suck. Here my code.
MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewpager_layout);
ViewPager vpPager = (ViewPager) findViewById(R.id.viewPager);
adapterViewPager = new viewPagerAdapter(getSupportFragmentManager());
vpPager.setAdapter(adapterViewPager);
vpPager.setCurrentItem(0);
getBottomBar();
// Attach the page change listener inside the activity
vpPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
// This method will be invoked when a new page becomes selected.
#Override
public void onPageSelected(int position) {
Toast.makeText(MainActivity.this,
"Seçilen sayfa: " + position, Toast.LENGTH_SHORT).show();
if (position == 0)
{
bottomNavigationBar.selectTab(0);
}
if (position == 1)
{
bottomNavigationBar.selectTab(1);
}
}
// This method will be invoked when the current page is scrolled
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// Code goes here
}
// Called when the scroll state changes:
// SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING
#Override
public void onPageScrollStateChanged(int state) {
// Code goes here
}
});
}
BottomNavigationBar bottomNavigationBar;
private void getBottomBar() {
bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
bottomNavigationBar
.addItem(new BottomNavigationItem(R.drawable.home, "Anasayfa"))
.addItem(new BottomNavigationItem(R.drawable.group, "Gruplar"))
.addItem(new BottomNavigationItem(R.drawable.counter, "Votloc"))
.addItem(new BottomNavigationItem(R.drawable.date, "Profil"))
.addItem(new BottomNavigationItem(R.drawable.password, "Daha Fazla"))
.initialise();
bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener(){
#Override
public void onTabSelected(int position) {
}
#Override
public void onTabUnselected(int position) {
}
#Override
public void onTabReselected(int position) {
}
});
bottomNavigationBar
.setMode(BottomNavigationBar.MODE_FIXED);
bottomNavigationBar
.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE);
bottomNavigationBar
.setActiveColor(R.color.colorPrimary)
.setInActiveColor("#FFFFFF")
.setBarBackgroundColor("#FF1717");
}
viewpager_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.ashokvarma.bottomnavigation.BottomNavigationBar
android:layout_gravity="bottom"
android:id="#+id/bottom_navigation_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
What should I do for use my bar every single page.
Am I have to create bar in every fragments ?

I realized it was because I used <include> to add the ListView to my fragment from another layout resource file.
After that I created a new layout file and I just included my ListView directly into the new layout file. Then I used this new layout file for myMainFragment.java file and finally my ViewPager works well.

FAB animation with viewpager/tabslider

I'm trying to find way to achieve such effect https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B6Okdz75tqQsVlhxNGJCNTEzNFU/components-buttons-fab-behavior_04_xhdpi_009.webm
I'm using android.support.v4.view.ViewPager
I appreciate any hints and help

First, you need to have the layout with the floating action button anchored to the ViewPager:
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/action_bar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/white"
app:tabGravity="center"
app:tabIndicatorColor="?attr/colorAccent"
app:tabMode="scrollable"
app:tabSelectedTextColor="?attr/colorAccent"
app:tabTextColor="#android:color/black" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
app:layout_anchor="#id/viewpager"
app:layout_anchorGravity="bottom|right|end"
android:layout_width="56dp"
android:layout_height="56dp"
android:src="#drawable/ic_add_white"
app:borderWidth="#dimen/fab_border_width"
app:fabSize="normal" />
</android.support.design.widget.CoordinatorLayout>
Now that you have the FAB anchored to the ViewPager (note: I've tried this on a fragment that is a tab in the viewpager; it does not seem to behave properly), add an OnPageChangeListener to your ViewPager like so:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
switch (position) {
case INDEX_OF_TAB_WITH_FAB:
fab.show();
break;
default:
fab.hide();
break;
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
The animations for the "pop" and the "shrink" upon switching tabs are handled automatically for you with the new version of the Support Library.

Here is another solution. The problem for me with other ones is that giving the control of the FAB to the activity that contains the ViewPager makes thing difficult to code.
I need lots of controls on the FAB by the Fragments to easily change the FAB icon and set specific listeners on it.
Roughly, the steps are:
Declares one FAB in the main activity that contains the ViewPager, and not in the fragments (it is a mandatory step that I wanted to avoid, but the magic comes after; doing otherwise makes things difficult for a good animation)
In each fragment to be displayed in the ViewPager, I create a method where I can pass a FAB, like public void shareFab(FloatingActionButton sharedFab); inside this method, each fragment will set the FAB icon and add the needed listeners
I set up a ViewPager.OnPageChangeListener listener on the ViewPager that will trigger animations and calls my shareFab methods.
So each time a fragment is displayed, the containing activity will give to the displayed fragment the reference of the FAB. The fragment then reset/recycle the FAB to suit its needs.
Here is an example:
The fragments to display
public void Fragment1 extends Fragment {
private FloatingActionButton mSharedFab;
#Override
public void onDestroy() {
super.onDestroy();
mSharedFab = null; // To avoid keeping/leaking the reference of the FAB
}
public void shareFab(FloatingActionButton fab) {
if (fab == null) { // When the FAB is shared to another Fragment
if (mSharedFab != null) {
mSharedFab.setOnClickListener(null);
}
mSharedFab = null;
}
else {
mSharedFab = fab;
mSharedFab.setImageResource(R.drawable.ic_search);
mSharedFab.setOnClickListener((fabView) -> {
// Your code
});
}
}
}
The container activity
public class ActivityMain extends AppCompatActivity {
FloatingActionButton mSharedFab;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSharedFab = (FloatingActionButton) findViewById(R.id.shared_fab);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
Fragment1 fragment1 = new Fragment1();
Fragment2 fragment2 = new Fragment2();
adapter.addFragment(fragment1, "Fragment1");
adapter.addFragment(fragment2, "Fragment2");
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setAdapter(adapter);
fragment1.shareFab(mSharedFab); // To init the FAB
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { }
#Override
public void onPageSelected(int position) { }
#Override
public void onPageScrollStateChanged(int state) {
switch (state) {
case ViewPager.SCROLL_STATE_DRAGGING:
mSharedFab.hide(); // Hide animation
break;
case ViewPager.SCROLL_STATE_IDLE:
switch (viewPager.getCurrentItem()) {
case 0:
fragment2.shareFab(null); // Remove FAB from fragment
fragment1.shareFab(mSharedFab); // Share FAB to new displayed fragment
break;
case 1:
default:
fragment1.shareFab(null); // Remove FAB from fragment
fragment2.shareFab(mSharedFab); // Share FAB to new displayed fragment
break;
}
mSharedFab.show(); // Show animation
break;
}
}
});
}
}
... and the classical layout of the main activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/shared_fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin" />
</android.support.design.widget.CoordinatorLayout>
The pros are:
animation like the one described in the Material Design guidelines!
full control of the FAB by each fragments
The cons are:
since the FAB can be shared to another fragments, the reference of the FAB should be checked each time to be sure it is not null
declaration of the FAB at the level of the ViewPager, a little cumbersome

For good animation of hide and show use this :
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
switch (state){
case ViewPager.SCROLL_STATE_IDLE:
fab.show();
break;
case ViewPager.SCROLL_STATE_DRAGGING:
case ViewPager.SCROLL_STATE_SETTLING:
fab.hide();
break;
}
}
});

The solution that I discovered was:
My fragments that are shown within my ViewPager implement an Interface (in my case FloatingActionButtonFragment). This interface requires that the fragment have a method handleFABClick(View).
My ViewPager change listener then looks like below:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
switch (state) {
case ViewPager.SCROLL_STATE_SETTLING:
displayFloatingActionButtonIfNeeded(viewPager.getCurrentItem());
break;
case ViewPager.SCROLL_STATE_IDLE:
displayFloatingActionButtonIfNeeded(viewPager.getCurrentItem());
break;
default:
mFloatingActionButton.hide();
}
}
});
private void displayFloatingActionButtonIfNeeded(int position) {
if (mFragmentStatePagerAdapter.getItem(position) instanceof FloatingActionButtonFragment) {
final FloatingActionButtonFragment floatingActionButtonFragment = (FloatingActionButtonFragment) mFragmentStatePagerAdapter.getItem(position);
mFloatingActionButton.show();
mFloatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
floatingActionButtonFragment.handleFABClick(v);
}
});
}
}
This makes the FAB 'hide' when the user is changing views, but then triggers the show method when the view state is either idle (it has settled) or is settling (I needed to do both as it didn't feel right only using idle).

I recently found much better solution that i am satisfied with. FAB hide method can also have a parameter - listener which is triggered when the button is hidden (show method also have this). The only drawback is that you have to implement viewpager and tablayout changes manually.
#Override
public void onPageSelected(int position) {
onToolbarTitleChanged(adapter.getPageTitle(position).toString());
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(final TabLayout.Tab tab) {
fab.hide(new FloatingActionButton.OnVisibilityChangedListener() { // Hide FAB
#Override
public void onHidden(FloatingActionButton fab) {
fab.show(); // After FAB is hidden show it again
}
});
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
If you want to show FAB only on specific tabs, you can change the onTabSelected method to:
#Override
public void onTabSelected(TabLayout.Tab tab) {
if (tab.getPosition() == 2) {
createButton.hide();
}
viewPager.setCurrentItem(tab.getPosition());
}

For my problem, I did not want to show floating action button on first Tab; in order to achieve this I added
android:visibility="invisible"
in floating action bar.
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:visibility="invisible"
app:srcCompat="#android:drawable/ic_input_add" />
And I have added ViewpagerListner in my activity as suggested by #chantell
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
switch (position) {
case 0:
addFloatingActionBt.hide();
break;
default:
addFloatingActionBt.show();
break;
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
});

PagerSlidingTabStrip isn't working, but my code seems OK to me

I've tried to implement PagerSlidingTabStrip to my app but it just isn't working. I did everything that is done in the sample but it isn't working. The tab indicator just isn't moving as it is supposed to and the app isn't crashing. Basically nothing is happening. I have no idea what is wrong.
MainActivity code
public class MainActivity extends FragmentActivity implements TabListener {
ActionBar aBar;
ViewPager vPager;
PagerAdapter pAdapter;
PagerSlidingTabStrip slidingTabStrip;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Action Bar
aBar = getActionBar();
aBar.setTitle("Beautiful Voice Recorder");
aBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Variables
slidingTabStrip = (PagerSlidingTabStrip) findViewById(R.id.slidingTabs);
vPager = (ViewPager) findViewById(R.id.pager);
pAdapter = new PagerAdapter(getSupportFragmentManager());
// Tabs
vPager.setAdapter(pAdapter);
slidingTabStrip.setViewPager(vPager);
aBar.addTab(aBar.newTab().setText("Record").setTabListener(this));
aBar.addTab(aBar.newTab().setText("Library").setTabListener(this));
vPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
LibraryFragment listViewFragment = (LibraryFragment)pAdapter.instantiateItem(vPager, 1);
RecordFragment recordFragment = (RecordFragment)pAdapter.instantiateItem(vPager, 0);
listViewFragment.updateComponents();
// Pause mp if it's playing and tabs are switched just in case
if (listViewFragment.mp.isPlaying())
{
listViewFragment.mp.pause();
listViewFragment.playPause.setBackgroundResource(R.drawable.play_button_selector);
}
if (recordFragment.isRecording)
{
recordFragment.stopRecording();
}
aBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
vPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
}
class PagerAdapter extends FragmentPagerAdapter{
String[] pageTitles = { "Record", "Library" };
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
Fragment fragment = new Fragment();
if (arg0 == 0)
{
fragment = new RecordFragment();
}
if (arg0 == 1)
{
fragment = new LibraryFragment();
}
return fragment;
}
#Override
public int getCount() {
return pageTitles.length;
}
#Override
public CharSequence getPageTitle(int position) {
return pageTitles[position];
}
}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/slidingTabs"
android:layout_width="match_parent"
android:layout_height="48dip" />
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Does anyone have any idea why my code is not working?

I think you didn't locate ViewPager even if it's RelativeLayout.
so try this code that i'm using. I hope it will be helpful for you.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip"
/>
<com.flitto.app.widgets.MainViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabs"
tools:context=".MainTabActivity"/>
</RelativeLayout>

I found where the problem was lying after I took a deeper look at the sample code. The problem was the fact that I still had the previous ActionBar tabs left in the code and those were overlapping the PagerSlidingTabStrip tabs so that I didn't see them.
All I had to do was to remove every reference to ActionBar tabs and it worked!