Monday, May 30, 2016

Using Android XML layout tabs without ViewPager and Fragments

In Android, the TabLayout widget is typically used together with a ViewPager and fragments; when a user touch a tab, a fragment associated with the tab is displayed in the activity. But sometimes, I do not want or need fragments for each tab; I just want to execute some code. This post illustrates an example of using the TabLayout without a ViewPager and Fragments and setting a tab selected listener to the TabLayout.



First, create an XML layout and add in the TabLayout code. Add in the TabItem widgets underneath the parent TabLayout node. You can simple use text or icons (in this example) for the TabItem labels.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.skyglob.insight.view.MainActivity">

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/coordinatorLayout"
        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.support.v7.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:tabGravity="fill"
                app:tabMode="fixed">

                <android.support.design.widget.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:icon="@drawable/ic_action_call" />

                <android.support.design.widget.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:icon="@drawable/ic_action_checkin" />

                <android.support.design.widget.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:icon="@drawable/ic_action_contacts" />

                <android.support.design.widget.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:icon="@drawable/ic_action_schedule" />

                <android.support.design.widget.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:icon="@drawable/ic_action_logout" />

            </android.support.design.widget.TabLayout>

        </android.support.design.widget.AppBarLayout>

        <include layout="@layout/content_main" />

    </android.support.design.widget.CoordinatorLayout>

</LinearLayout>

In the activity Java code, add in the tab selected listener. The following is an example showing how to assign a tab selected listener to the TabLayout widget.


private void setupTabLayout() {
    TabLayout mTabLayout = (TabLayout) findViewById(R.id.tabs);
    mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            onTabTapped(tab.getPosition());
        }
        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }
        @Override
        public void onTabReselected(TabLayout.Tab tab) {
            onTabTapped(tab.getPosition());
        }
    });
}

private void onTabTapped(int position) {
    switch (position) {
        case 0:
            // Do something when first tab is tapped here
            break;
        default:
            Toast.makeText(this, "Tapped " + position, Toast.LENGTH_SHORT);
    }
}

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