TabLayout，使用小结

效果图

TabLayout详解

什么是TabLayout

TabLayout provides a horizontal layout to display tabs.[google]
TabLayout是一个用于放置水平Tab的布局

你可以设置文字，icon，甚至是自定义的View

TabLayout的继承关系

TabLayout可配置属性

属性名	解释
tabContentStart	开始位置的偏移量
tabBackground	设置Tab的背景色
tabGravity	分为fill,center,Tab的对齐方式
tabIndicatorColor	导航条的颜色
tabIndicatorHeight	导航条的高度
tabMaxWidth	Tab的最大宽度
tabMinWidth	Tab的最小宽度
tabMode	分为scrollable,fixed,Tab的模式(设置为scrollable代表tab足够多的时候可以水平滚动，而设置为fixed则表示所有tab默认在一页显示，不能滚动)
tabPadding	Tab的内边距
tabPaddingBottom	Tab的内底边距
tabPaddingEnd	Tab的右内边距
tabPaddingStart	Tab的左内边距
tabPaddingTop	Tab的上内边距
tabSelectedTextColor	Tab文字选中颜色
tabTextColor	Tab文字颜色（未选中）
tabTextAppearance	Tab文字样式

TabGravity跟tabMode有着紧密的联系，具体区别如图所示：

1，TabGravity:fill & tabMode:fixed

tab较少时
fill&fixed

tab较多时
fill&fixed

2，TabGravity:center & tabMode:fixed

tab较少时
center&fixed

tab较多时
fill&fixed

3，TabGravity:fill & tabMode:scrollable

tab较少时
fill&scrollable

tab较多时
fill&scrollable

4，TabGravity:center & tabMode:scrollable
tab较少时
fill&scrollable

tab较多时
fill&scrollable

TabGravity属性只有在TabMode为fixed情况下才有用

XML配置Tab

效果图：

此处输入图片的描述

自定义属性跟布局代码：

首先是我们的自定义属性:

    <style name="AppTabLayout" parent="Widget.Design.TabLayout">
        <item name="android:background">@color/colorPrimary</item>
        <item name="tabIndicatorColor">@color/tabTextSelected</item>
        <item name="tabTextColor">@color/tabText</item>
        <item name="tabSelectedTextColor">@color/tabTextSelected</item>
        <item name="tabGravity">fill</item>
        <item name="tabMode">scrollable</item><!--默认scrollable模式-->
        <item name="tabIndicatorHeight">2dp</item>
        <item name="tabPaddingStart">8dp</item>
        <item name="tabPaddingEnd">8dp</item>
        <item name="tabTextAppearance">@style/TextAppearance</item>
    </style>
    <style name="TextAppearance" parent="TextAppearance.Design.Tab">
        <item name="android:textSize">16sp</item>
        <item name="textAllCaps">true</item>
    </style>

接下来是布局代码：

 <android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        style="@style/AppTabLayout"
        >

        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="热点" />

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

        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全球" />

        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="新闻30分" />

        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="网易" />

        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="叮当猫" />

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

代码设置Tab

效果图：

效果图

代码：

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout mTabLayout = (TabLayout) findViewById(R.id.tabLayout);
        mTabLayout.addTab(mTabLayout.newTab().setIcon(R.mipmap.ic_launcher));//设置为icon
        mTabLayout.addTab(mTabLayout.newTab().setText("实时"));
        mTabLayout.addTab(mTabLayout.newTab().setText("全球"),0,true);//添加tab指定tab位置并设为选中
        mTabLayout.addTab(mTabLayout.newTab().setText("新闻30分"));
        mTabLayout.addTab(mTabLayout.newTab().setText("网易"));
        mTabLayout.addTab(mTabLayout.newTab().setText("叮当猫"));
        //这里都可以用代码设置TabLayout的属性，这里不列
    }

这里将addTab方法的源码贴出，很明了：

      /**
     * Add a tab to this layout. The tab will be inserted at <code>position</code>.
     * If this is the first tab to be added it will become the selected tab.
     *
     * @param tab The tab to add
     * @param position The new position of the tab
     */
    public void addTab(@NonNull Tab tab, int position) {
        addTab(tab, position, mTabs.isEmpty());//mTabs用于存储TabLayout的所有tab
    }

    /**
     * Add a tab to this layout. The tab will be added at the end of the list.
     *
     * @param tab Tab to add
     * @param setSelected True if the added tab should become the selected tab.
     */
    public void addTab(@NonNull Tab tab, boolean setSelected) {
        if (tab.mParent != this) {
            throw new IllegalArgumentException("Tab belongs to a different TabLayout.");
        }

        addTabView(tab, setSelected);
        configureTab(tab, mTabs.size());
        if (setSelected) {
            tab.select();
        }
    }

    /**
     * Add a tab to this layout. The tab will be inserted at <code>position</code>.
     *
     * @param tab The tab to add
     * @param position The new position of the tab
     * @param setSelected True if the added tab should become the selected tab.
     */
    public void addTab(@NonNull Tab tab, int position, boolean setSelected) {
        if (tab.mParent != this) {
            throw new IllegalArgumentException("Tab belongs to a different TabLayout.");
        }

        addTabView(tab, position, setSelected);
        configureTab(tab, position);
        if (setSelected) {
            tab.select();
        }
    }

tips
java代码设置默认选中

tablayout.getTabAt(position).select();

监听Tab的各种事件

效果图：

点击效果图

Java代码：

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TabLayout mTabLayout = (TabLayout) findViewById(R.id.tabLayout);
        mTabLayout.addTab(mTabLayout.newTab().setText("热点"),false);//不选中
        mTabLayout.addTab(mTabLayout.newTab().setText("实时"),false);
        mTabLayout.addTab(mTabLayout.newTab().setText("全球"),1,true);//添加tab指定tab位置并设为选中
        mTabLayout.addTab(mTabLayout.newTab().setText("新闻30分"),false);
        mTabLayout.addTab(mTabLayout.newTab().setText("网易"));
        mTabLayout.addTab(mTabLayout.newTab().setText("叮当猫"),false);

        mTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            /**
             * 当tab第一次选择时候调用
             * @param tab
             */

            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                Toast.makeText(MainActivity.this, "select tab = "+tab.getText(), Toast.LENGTH_SHORT).show();
            }

            /**
             * 当tab从 选择 ->未选择
             * @param tab
             */
            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                Toast.makeText(MainActivity.this, "unselected = "+tab.getText(), Toast.LENGTH_SHORT).show();
            }

            /**
             * 当tab已是选择状态时，继续点击调用此方法
             * @param tab
             */
            @Override
            public void onTabReselected(TabLayout.Tab tab) {
                Toast.makeText(MainActivity.this, "reselected = "+tab.getText(), Toast.LENGTH_SHORT).show();
            }
        });

    }

TabLayout联合ViewPager

效果图:

效果图

java代码

public class MainActivity extends AppCompatActivity {
    private List<String> titleList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        titleList = new ArrayList<>();
        titleList.add("热点");
        titleList.add("全球");
        titleList.add("实时");
        titleList.add("新闻30分");
        titleList.add("网易");
        titleList.add("叮当猫");

        TabLayout mTabLayout = (TabLayout) findViewById(R.id.tabLayout);
        ViewPager mViewPager = (ViewPager) findViewById(R.id.viewPager);
        mViewPager.setAdapter(new CustomPagerAdapter(this));
        mTabLayout.setupWithViewPager(mViewPager);
    }

    class CustomPagerAdapter extends PagerAdapter{
        private Context context;
        public CustomPagerAdapter(Context context){
            this.context = context;
        }
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            TextView mTextView = new TextView(context);
            mTextView.setText(titleList.get(position));
            mTextView.setGravity(Gravity.CENTER);
            mTextView.setTextColor(Color.WHITE);
            mTextView.setTextSize(20);
            container.addView(mTextView);
            return mTextView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
           container.removeView((View) object);
        }

        @Override
        public int getCount() {
            return titleList.size() == 0 ? 0 :  titleList.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return titleList.get(position);
        }
    }

}

XML

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/darker_gray"
    android:orientation="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">
     <android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        style="@style/AppTabLayout"
        />
    <android.support.v4.view.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>