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TabLayout 全面總結(jié)

2018-10-16    seo達(dá)人

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一、簡(jiǎn)介

TabLayout提供了一個(gè)水平布局用于展示tabs,繼承自HorizontalScrollView。一般與Viewpager結(jié)合使用實(shí)現(xiàn)頁(yè)面和標(biāo)簽聯(lián)動(dòng)的效果,是時(shí)下APP中非常常用的一個(gè)控件



二、基本用法

  1. 添加design依賴

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

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  2. xml引用
  3. 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>

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  4. 代碼中添加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>

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    // tablayout,Tab是TabLayout的內(nèi)部類,且Tab的構(gòu)造方法是包訪問(wèn)權(quán)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"));

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    三、屬性詳解

    <declare-styleable name="TabLayout">

        <!--指示器顏色-->

        <attr name="tabIndicatorColor" format="color"/>

        <!--指示器高度-->

        <attr name="tabIndicatorHeight" format="dimension"/>

        <!--tabs距TabLayout開始位置的偏移量,但app:tabMode="scrollable"才生效-->

        <attr name="tabContentStart" format="dimension"/>

        <!--僅是Tab背景,設(shè)置TabLayout背景用android:background-->

        <attr name="tabBackground" format="reference"/>

        <!--默認(rèn)fixed,所有Tab只能在屏幕內(nèi)顯示,超出會(huì)被擠壓;scrollable,tab數(shù)量多會(huì)超出屏幕,可滑動(dòng)-->

        <attr name="tabMode">

            <enum name="scrollable" value="0"/>

            <enum name="fixed" value="1"/>

        </attr>

        <!--默認(rèn)fill,tab填滿TabLayout,但tabMode=“fixed”才生效;center,tabs位于TabLayout的中間-->

        <attr name="tabGravity">

            <enum name="fill" value="0"/>

            <enum name="center" value="1"/>

        </attr>

        <!--Tab的最小寬度-->

        <attr name="tabMinWidth" format="dimension"/>

        <!--Tab的最大寬度-->

        <attr name="tabMaxWidth" format="dimension"/>

        <!--Tab文本設(shè)置樣式-->

        <attr name="tabTextAppearance" format="reference"/>

        <!--Tab未選中字體顏色-->

        <attr name="tabTextColor" format="color"/>

        <!--Tab選中字體顏色-->

        <attr name="tabSelectedTextColor" format="color"/>

        <!--Tab內(nèi)填充相關(guān)-->

        <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>

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    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"/>

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    <style name="MyTabTextAppearance" parent="TextAppearance.Design.Tab">

        <item name="textAllCaps">false</item>

        <item name="android:textSize">18sp</item>

    </style>

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    四、圖文混排,Tab中添加圖片
  5. 通過(guò)SpannableString設(shè)置圖片

    @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;

    }

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    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)));

    ……

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    我們會(huì)發(fā)現(xiàn)個(gè)問(wèn)題,通過(guò)ImageSpan設(shè)置的圖片和文字沒有對(duì)齊,先百度到一個(gè)可用方法解決:重寫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;//計(jì)算y方向的位移

            canvas.save();

            canvas.translate(x, transY);//繪制圖片位移一段距離

            b.draw(canvas);

            canvas.restore();

        }

    }

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    將上面的ImageSpan替換為現(xiàn)在的CenterImageSpan,即可實(shí)現(xiàn)圖文混排時(shí)對(duì)齊






  6. 通過(guò)Tab.setCustomView()設(shè)置圖片
  7. 自定義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="首頁(yè)"/>

    </LinearLayout>

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  8. 代碼設(shè)置

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);

    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_home,"首頁(yè)")));

    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_info,"資訊")));

    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_live,"直播")));

    tabLayout.addTab(tabLayout.newTab().setCustomView(setCustomView(R.drawable.ic_me,"我")));

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     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;

    }

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    五、TabLayout與Viewpager聯(lián)動(dòng)
  9. xml設(shè)置TabLayout和Viewpager

    第一種:TabLayout放置在Viewpager的上方,放在AppbarLayout中會(huì)有陰影效果



    <?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>

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    第二種:TabLayout直接放在Viewpager,無(wú)陰影



    <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>

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  10. 為Viewpager創(chuàng)建適配器

    /

      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 = {"首頁(yè)","資訊","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];

        }

    }

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    主要是重寫getPageTitle()方法


  11. 代碼設(shè)置 TabLayout和Viewpager綁定

     // tablayout

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);



    // vp

    mViewPager = (ViewPager) findViewById(R.id.container);

    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

    mViewPager.setAdapter(mSectionsPagerAdapter);



    // 綁定,要在viewpager設(shè)置完數(shù)據(jù)后,調(diào)用此方法,否則不顯示 tabs文本

    tabLayout.setupWithViewPager(mViewPager);

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    調(diào)用setupWithViewPager()方法,則使用TabLayout.addtab()方法無(wú)效,TabLayout會(huì)清除之前添加的所有tabs,并將根據(jù)Viewpager的頁(yè)數(shù)添加Tab,Tab標(biāo)題為對(duì)應(yīng)頁(yè)通過(guò)getPageTitle()返回的文本






  12. 圖文混排
  13. 同上,使用SpannableString

    修改Adapter如下:



    /*

     
    pagerAdapter

     */

    public class SectionsPagerAdapter extends FragmentPagerAdapter {



        String[] tabs = {"首頁(yè)","資訊","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]);

        }

    }

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    setImageSpan()方法同上






  14. 同上,使用Tab.setCustomView()

    修改pagerAdapter如下:



    /

      pagerAdapter

     
    /

    public class SectionsPagerAdapter extends FragmentPagerAdapter {



        String[] tabs = {"首頁(yè)","資訊","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;

        }



        /


          設(shè)置自定義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;

        }

    }

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    代碼修改如下:



    …………

    // 綁定,要在viewpager設(shè)置完數(shù)據(jù)后,調(diào)用此方法,否則不顯示 tabs文本

    tabLayout.setupWithViewPager(mViewPager);



    // 為綁定viewpager后的TabLayout的tabs設(shè)置自定義view

    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {

        tabLayout.getTabAt(i).setCustomView(mSectionsPagerAdapter.setCustomView(i));

    }

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    發(fā)現(xiàn)問(wèn)題:我使用的仍然是上面的item_tab,但是只顯示圖片,不顯示文字如下







    翻了翻源碼,也沒發(fā)現(xiàn)有對(duì)Tab的標(biāo)題有特別的設(shè)置;后來(lái),就感覺是不是顏色問(wèn)題,給item_tab中的textview加上屬性android:textColor="@android:color/black",就顯示出來(lái)了







    六、FlycoTabLayout

    這是一個(gè)不錯(cuò)的TabLayout開源項(xiàng)目,效果挺好,可以了解一下。





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