Android Support Design TabLayout: Gravity Center and Mode Scrollable
I made small changes of @Mario Velasco's solution on the runnable part:
TabLayout.xml
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:background="@android:color/transparent"
app:tabGravity="fill"
app:tabMode="scrollable"
app:tabTextAppearance="@style/TextAppearance.Design.Tab"
app:tabSelectedTextColor="@color/myPrimaryColor"
app:tabIndicatorColor="@color/myPrimaryColor"
android:overScrollMode="never"
/>
Oncreate
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
mTabLayout = (TabLayout)findViewById(R.id.tab_layout);
mTabLayout.setOnTabSelectedListener(this);
setSupportActionBar(mToolbar);
mTabLayout.addTab(mTabLayout.newTab().setText("Dashboard"));
mTabLayout.addTab(mTabLayout.newTab().setText("Signature"));
mTabLayout.addTab(mTabLayout.newTab().setText("Booking/Sampling"));
mTabLayout.addTab(mTabLayout.newTab().setText("Calendar"));
mTabLayout.addTab(mTabLayout.newTab().setText("Customer Detail"));
mTabLayout.post(mTabLayout_config);
}
Runnable mTabLayout_config = new Runnable()
{
@Override
public void run()
{
if(mTabLayout.getWidth() < MainActivity.this.getResources().getDisplayMetrics().widthPixels)
{
mTabLayout.setTabMode(TabLayout.MODE_FIXED);
ViewGroup.LayoutParams mParams = mTabLayout.getLayoutParams();
mParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
mTabLayout.setLayoutParams(mParams);
}
else
{
mTabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
}
}
};
Tab gravity only effects MODE_FIXED
.
One possible solution is to set your layout_width
to wrap_content
and layout_gravity
to center_horizontal
:
<android.support.design.widget.TabLayout
android:id="@+id/sliding_tabs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
app:tabMode="scrollable" />
If the tabs are smaller than the screen width, the TabLayout
itself will also be smaller and it will be centered because of the gravity. If the tabs are bigger than the screen width, the TabLayout
will match the screen width and scrolling will activate.
As I didn't find why does this behaviour happen I have used the following code:
float myTabLayoutSize = 360;
if (DeviceInfo.getWidthDP(this) >= myTabLayoutSize ){
tabLayout.setTabMode(TabLayout.MODE_FIXED);
} else {
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
}
Basically, I have to calculate manually the width of my tabLayout and then I set the Tab Mode depending on if the tabLayout fits in the device or not.
The reason why I get the size of the layout manually is because not all the tabs have the same width in Scrollable mode, and this could provoke that some names use 2 lines as it happened to me in the example.