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TabLayout全面总结

TabLayout全面总结

作者: 草帽团长 | 来源:发表于2018-01-11 13:25 被阅读0次

    一、简介


    TabLayout提供了一个水平布局用于展示tabs,继承自HorizontalScrollView。一般与Viewpager结合使用实现页面和标签联动的效果,是时下APP中非常常用的一个控件

    二、基本用法


    1. 添加design依赖

    compile 'com.android.support:design:25.3.1'
    

    2. xml引用

    1. xml中添加tab

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Tab1"/>
        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Tab2"/>
        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Tab3"/>
        <android.support.design.widget.TabItem
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Tab4"/>
    </android.support.design.widget.TabLayout>
    

    2. 代码中添加tab

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </android.support.design.widget.TabLayout>
    
    // tablayout,Tab是TabLayout的内部类,且Tab的构造方法是包访问权限
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.addTab(tabLayout.newTab().setText("Tab1"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab2"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab3"));
    tabLayout.addTab(tabLayout.newTab().setText("Tab4"));
    
    image

    三、属性详解


    <declare-styleable name="TabLayout">
        <!--指示器颜色-->
        <attr name="tabIndicatorColor" format="color"/>
        <!--指示器高度-->
        <attr name="tabIndicatorHeight" format="dimension"/>
        <!--tabs距TabLayout开始位置的偏移量,但app:tabMode="scrollable"才生效-->
        <attr name="tabContentStart" format="dimension"/>
        <!--仅是Tab背景,设置TabLayout背景用android:background-->
        <attr name="tabBackground" format="reference"/>
        <!--默认fixed,所有Tab只能在屏幕内显示,超出会被挤压;scrollable,tab数量多会超出屏幕,可滑动-->
        <attr name="tabMode">
            <enum name="scrollable" value="0"/>
            <enum name="fixed" value="1"/>
        </attr>
        <!--默认fill,tab填满TabLayout,但tabMode=“fixed”才生效;center,tabs位于TabLayout的中间-->
        <attr name="tabGravity">
            <enum name="fill" value="0"/>
            <enum name="center" value="1"/>
        </attr>
        <!--Tab的最小宽度-->
        <attr name="tabMinWidth" format="dimension"/>
        <!--Tab的最大宽度-->
        <attr name="tabMaxWidth" format="dimension"/>
        <!--Tab文本设置样式-->
        <attr name="tabTextAppearance" format="reference"/>
        <!--Tab未选中字体颜色-->
        <attr name="tabTextColor" format="color"/>
        <!--Tab选中字体颜色-->
        <attr name="tabSelectedTextColor" format="color"/>
        <!--Tab内填充相关-->
        <attr name="tabPaddingStart" format="dimension"/>
        <attr name="tabPaddingTop" format="dimension"/>
        <attr name="tabPaddingEnd" format="dimension"/>
        <attr name="tabPaddingBottom" format="dimension"/>
        <attr name="tabPadding" format="dimension"/>
    </declare-styleable>
    

    使用示例

     <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabIndicatorColor="@color/colorPrimaryDark"
        app:tabIndicatorHeight="2dp"
        app:tabContentStart="50dp"
        app:tabBackground="@color/colorAccent"
        app:tabMode="scrollable"
        app:tabGravity="fill"
        app:tabTextAppearance="@style/MyTabTextAppearance"
        app:tabTextColor="@android:color/black"
        app:tabSelectedTextColor="@android:color/white"/>
    
    <style name="MyTabTextAppearance" parent="TextAppearance.Design.Tab">
        <item name="textAllCaps">false</item>
        <item name="android:textSize">18sp</item>
    </style>
    
    image

    四、图文混排,Tab中添加图片


    1. 通过SpannableString设置图片

    @NonNull
    private SpannableString setImageSpan(String string,int drawableId) {
        SpannableString ss = new SpannableString("  "+string);
        Drawable drawable = ContextCompat.getDrawable(this, drawableId);
        drawable.setBounds(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
        ImageSpan imageSpan = new ImageSpan(drawable);
        ss.setSpan(imageSpan,0,1, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
        return ss;
    }
    
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.addTab(tabLayout.newTab().setText(setImageSpan("Tab1",R.drawable.ic_home)));
    tabLayout.addTab(tabLayout.newTab().setText(setImageSpan("Tab2",R.drawable.ic_info)));
    ……
    
    image

    我们会发现个问题,通过ImageSpan设置的图片和文字没有对齐,先百度到一个可用方法解决:重写ImageSpan的draw()方法

    package com.strivestay.tablayoutdemo;
    
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.graphics.drawable.Drawable;
    import android.support.annotation.NonNull;
    import android.text.style.ImageSpan;
    
    public class CenterImageSpan extends ImageSpan {
        public CenterImageSpan(Drawable drawable) {
            super(drawable);
    
        }
    
        public CenterImageSpan(Bitmap b) {
            super(b);
        }
    
        @Override
        public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom,
                         @NonNull Paint paint) {
    
            Drawable b = getDrawable();
            Paint.FontMetricsInt fm = paint.getFontMetricsInt();
            int transY = (y + fm.descent + y + fm.ascent) / 2 - b.getBounds().bottom / 2;//计算y方向的位移
            canvas.save();
            canvas.translate(x, transY);//绘制图片位移一段距离
            b.draw(canvas);
            canvas.restore();
        }
    }
    
    

    将上面的ImageSpan替换为现在的CenterImageSpan,即可实现图文混排时对齐

    image

    2. 通过Tab.setCustomView()设置图片

    1. 自定义view布局

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center">
        <ImageView
            android:id="@+id/iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_home"/>
        <TextView
            android:id="@+id/tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="2dp"
            android:textSize="16sp"
            android:text="首页"/>
    </LinearLayout>
    

    2. 代码设置

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_home,"首页")));
    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_info,"资讯")));
    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_live,"直播")));
    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_me,"我")));
    
     private View setCustomView(int drawableId,String tabText) {
        View view = View.inflate(this, R.layout.item_tab, null);
        ImageView iv = (ImageView) view.findViewById(R.id.iv);
        TextView tv = (TextView) view.findViewById(R.id.tv);
        iv.setImageResource(drawableId);
        tv.setText(tabText);
        return view;
    }
    
    image

    五、TabLayout与Viewpager联动


    1. xml设置TabLayout和Viewpager

    第一种:TabLayout放置在Viewpager的上方,放在AppbarLayout中会有阴影效果

    <?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"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/main_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context="com.strivestay.tablayoutdemo.MainActivity">
    
        <android.support.design.widget.AppBarLayout
            android:id="@+id/appbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="@dimen/appbar_padding_top"
            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:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/AppTheme.PopupOverlay">
    
            </android.support.v7.widget.Toolbar>
    
            <android.support.design.widget.TabLayout
                android:id="@+id/tab_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:tabIndicatorColor="@color/colorAccent"
                app:tabIndicatorHeight="2dp"
                app:tabBackground="@android:color/white"
                app:tabTextAppearance="@style/MyTabTextAppearance"
                app:tabTextColor="@android:color/black"
                app:tabSelectedTextColor="@android:color/holo_blue_light">
            </android.support.design.widget.TabLayout>
    
        </android.support.design.widget.AppBarLayout>
    
        <android.support.v4.view.ViewPager
            android:id="@+id/container"
            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"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:layout_margin="@dimen/fab_margin"
            app:srcCompat="@android:drawable/ic_dialog_email"/>
    
    </android.support.design.widget.CoordinatorLayout>
    
    
    image

    第二种:TabLayout直接放在Viewpager,无阴影

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">
        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabIndicatorColor="@color/colorAccent"
            app:tabIndicatorHeight="2dp"
            app:tabBackground="@android:color/white"
            app:tabTextAppearance="@style/MyTabTextAppearance"
            app:tabTextColor="@android:color/black"
            app:tabSelectedTextColor="@android:color/holo_blue_light">
        </android.support.design.widget.TabLayout>
    </android.support.v4.view.ViewPager>
    
    image

    2. 为Viewpager创建适配器

    /**
     * fragment
     */
    public static class PlaceholderFragment extends Fragment {
        private static final String ARG_SECTION = "section";
    
        public PlaceholderFragment() {
        }
    
        public static PlaceholderFragment newInstance(String section) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putString(ARG_SECTION, section);
            fragment.setArguments(args);
            return fragment;
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            TextView textView = (TextView) rootView.findViewById(R.id.section_label);
            textView.setText(getArguments().getString(ARG_SECTION));
            return rootView;
        }
    }
    
    /**
     * pagerAdapter
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {
        String[] tabs = {"首页","资讯","直播","我"};
    
        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }
    
        @Override
        public Fragment getItem(int position) {
            return PlaceholderFragment.newInstance(tabs[position]);
        }
    
        @Override
        public int getCount() {
            return tabs.length;
        }
    
        @Override
        public CharSequence getPageTitle(int position) {
            return tabs[position];
        }
    }
    

    主要是重写getPageTitle()方法

    3. 代码设置 TabLayout和Viewpager绑定

     // tablayout
    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    
    // vp
    mViewPager = (ViewPager) findViewById(R.id.container);
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    mViewPager.setAdapter(mSectionsPagerAdapter);
    
    // 绑定,要在viewpager设置完数据后,调用此方法,否则不显示 tabs文本
    tabLayout.setupWithViewPager(mViewPager);
    

    调用setupWithViewPager()方法,则使用TabLayout.addtab()方法无效,TabLayout会清除之前添加的所有tabs,并将根据Viewpager的页数添加Tab,Tab标题为对应页通过getPageTitle()返回的文本

    image

    4. 图文混排

    1. 同上,使用SpannableString

    修改Adapter如下:

    /**
     * pagerAdapter
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {
    
        String[] tabs = {"首页","资讯","直播","我"};
        int[] imgs = {R.drawable.ic_home,R.drawable.ic_info,R.drawable.ic_live,R.drawable.ic_me};
    
        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }
    
        @Override
        public Fragment getItem(int position) {
            return PlaceholderFragment.newInstance(tabs[position]);
        }
    
        @Override
        public int getCount() {
            return tabs.length;
        }
    
        @Override
        public CharSequence getPageTitle(int position) {
    //            return tabs[position];
            return setImageSpan(tabs[position],imgs[position]);
        }
    }
    

    setImageSpan()方法同上

    image

    2. 同上,使用Tab.setCustomView()

    修改pagerAdapter如下:

    /**
     * pagerAdapter
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {
    
        String[] tabs = {"首页","资讯","直播","我"};
        int[] imgs = {R.drawable.ic_home,R.drawable.ic_info,R.drawable.ic_live,R.drawable.ic_me};
    
        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }
    
        @Override
        public Fragment getItem(int position) {
            return PlaceholderFragment.newInstance(tabs[position]);
        }
    
        @Override
        public int getCount() {
            return tabs.length;
        }
    
        @Override
        public CharSequence getPageTitle(int position) {
    //            return tabs[position];
    //            return setImageSpan(tabs[position],imgs[position]);
            return null;
        }
    
        /**
         * 设置自定义view
         * @param position
         * @return
         */
        public View setCustomView(int position) {
            View view = View.inflate(getApplicationContext(), R.layout.item_tab, null);
            ImageView iv = (ImageView) view.findViewById(R.id.iv);
            TextView tv = (TextView) view.findViewById(R.id.tv);
            iv.setImageResource(imgs[position]);
            tv.setText(tabs[position]);
            return view;
        }
    }
    

    代码修改如下:

    …………
    // 绑定,要在viewpager设置完数据后,调用此方法,否则不显示 tabs文本
    tabLayout.setupWithViewPager(mViewPager);
    
    // 为绑定viewpager后的TabLayout的tabs设置自定义view
    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
        tabLayout.getTabAt(i).setCustomView(mSectionsPagerAdapter.setCustomView(i));
    }
    

    发现问题:我使用的仍然是上面的item_tab,但是只显示图片,不显示文字如下

    image

    翻了翻源码,也没发现有对Tab的标题有特别的设置;后来,就感觉是不是颜色问题,给item_tab中的textview加上属性android:textColor="@android:color/black",就显示出来了

    image

    六、FlycoTabLayout


    这是一个不错的TabLayout开源项目,效果挺好,可以了解一下。

    [图片上传失败...(image-c4a29b-1545207113595)]

    GitHub示例:ViewDemo/TabLayoutDemo


    个人总结,水平有限,如果有错误,希望大家能给留言指正!如果对您有所帮助,可以帮忙点个赞!如果转载,希望可以留言告知并在显著位置保留草帽团长的署名和标明文章出处!最后,非常感谢您的阅读!

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