Tab Fragment Tutorial - Classes - SimpleTabDefinition.java

/**
 * Blog Post:
 * http://devleader.ca/2013/11/04/fragments-tabbed-android-user-interface
 *
 * Layouts:
 * activity_main.xml: http://pastebin.com/kj8M38Ze
 * fragment_tabs.xml: http://pastebin.com/0b7HAeAK
 * simple_tab.xml: http://pastebin.com/9SqLbS0X
 *
 * Classes:
 * MainActivity.java: http://pastebin.com/eBv3H775
 * SimpleTabDefinition.java: http://pastebin.com/wW3WCcy9
 * TabDefinition.java: http://pastebin.com/KSRV2f3U
 * TabsFragment.java: http://pastebin.com/9Asv7AVH
 */
package com.devleader.tab_fragment_tutorial;

import android.support.v4.app.Fragment;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams;

/**
 * A class that defines a simple tab.
 */
public class SimpleTabDefinition extends TabDefinition {
    //
    // Fields
    //
    private final int _tabTitleResourceId;
    private final int _tabTitleViewId;
    private final int _tabLayoutId;
    private final Fragment _fragment;

    //
    // Constructors
    //
    /**
     * The constructor for {@link SimpleTabDefinition}.
     * @param tabContentViewId The layout ID of the contents to use when the tab is active.
     * @param tabLayoutId The ID of the layout to use when inflating the tab {@link View}.
     * @param tabTitleResourceId The string resource ID for the title of the tab.
     * @param tabTitleViewId The layout ID for the title of the tab.
     * @param fragment The {@link Fragment} used when the tab is active.
     */
    public SimpleTabDefinition(int tabContentViewId, int tabLayoutId, int tabTitleResourceId, int tabTitleViewId, Fragment fragment) {
        super(tabContentViewId);

        _tabLayoutId = tabLayoutId;
        _tabTitleResourceId = tabTitleResourceId;
        _tabTitleViewId = tabTitleViewId;
        _fragment = fragment;
    }

    //
    // Exposed Members
    //
    @Override
    public Fragment getFragment() {
        return _fragment;
    }

    @Override
    public View createTabView(LayoutInflater inflater, ViewGroup tabsView) {
        // we need to inflate the view based on the layout id specified when
        // this instance was created.
        View indicator = inflater.inflate(
            _tabLayoutId,
            tabsView,
            false);

        // set up the title of the tab. this will populate the text with the
        // string defined by the resource passed in when this instance was
        // created. the text will also be centered within the title control.
        TextView titleView = (TextView)indicator.findViewById(_tabTitleViewId);
        titleView.setText(_tabTitleResourceId);
        titleView.setGravity(Gravity.CENTER);

        // ensure the control we're inflating is layed out properly. this will
        // cause our tab titles to be placed evenly weighted across the top.
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LayoutParams.WRAP_CONTENT,
            LayoutParams.WRAP_CONTENT);
        layoutParams.weight = 1;
        indicator.setLayoutParams(layoutParams);

        return indicator;
    }
}