android,安卓,TabLayout + ViewPager + Fragment

TabLayout
展示效果：方便的实现tab跟随Viewpager切换，不需要第三方或者自定义
在layout里使用tablayout
向tablayout对象addTab

tabLayout.addTab(tabLayout.newTab().setText(""))

关联ViewPager
方式一: viewpager.addOnPagerChangeListener(new TabLayoutOnPagerChangeListener(tabLayout))
方式二：tabLayout.setupWithViewPager(viewPager) ,在使用TabItem布局在XML中添加标题以及图片的时候,不能使用这种方式因为,源码会移除item,所以显示不了文字以及图片

具体示例代码 :
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首先 : 添加依赖包 :

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

布局文件 :

<?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=".Main3Activity">

    <android.support.design.widget.TabLayout
        android:background="@android:color/darker_gray"
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMaxWidth="0dp"
        app:tabGravity="fill"
        app:tabIndicatorColor="@android:color/holo_green_light"
        app:tabSelectedTextColor="@color/colorAccent"
        app:tabTextColor="@android:color/black" />

    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

Main的主要代码 :

public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {
    String[] titles = new String[]{"首页", "尾页","第三"};
    ArrayList<Fragment> fragmentLists = new ArrayList<>();
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_ACTION_BAR);
        setContentView(R.layout.activity_main);
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tablayout);
        mViewPager = (ViewPager) findViewById(R.id.viewpager);

        tabLayout.setTabMode(TabLayout.MODE_FIXED);  // 设置固定的模式
        for (String title: titles) {
          tabLayout.addTab(tabLayout.newTab().setText(title));
        }

        tabLayout.setOnTabSelectedListener(this);
         fragmentLists.add(new FirstFragment());
         fragmentLists.add(new LastFragment());
        fragmentLists.add(new ThreeFragment());
        MyAdapter myadapter = new MyAdapter(getSupportFragmentManager(),titles,fragmentLists);
        mViewPager.setAdapter(myadapter);
        tabLayout.setupWithViewPager(mViewPager);

    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
       mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

VIewPagerAdapter 的主要示例代码 :

public class MyAdapter extends FragmentPagerAdapter {
    private String[] titles;
    private List<Fragment> fragments;
    public MyAdapter(FragmentManager fm, String[]titles, List<Fragment> fragments) {
        super(fm);
        this.titles=titles;
        this.fragments=fragments;
    }

    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }

    @Override
    public int getCount() {
        return fragments.size();
    }
}

使用模拟器中发现,当TabLayout 在宽屏幕的设备上，tab的宽度超过一定值后，就不在平均分配宽度，而是居中显示。此时设置 app :tabMode 或者在代码中设置模式没有效果,这时候可以在XML中这样设置 :

app:tabMaxWidth="0dp"
app:tabGravity="fill"

就可以成功显示

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另外包含图片的方式 : 有图片的形式 : ☆☆☆☆☆

添加图片的最好的办法 : 首先添加 design 依赖

<android.support.design.widget.TabLayout
    android:id="@+id/tab_layout2"
    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:icon="@mipmap/ic_launcher"   // 在这里直接添加图片以及文字就行
        android:text="个性推荐"/>

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

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

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

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

MainAvtivvity 里面的代码 : 注意下面注释(重要) ☆☆

public class SecondActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {

    private TabLayout mTabLayout;
    private ViewPager mViewPager;
    private ArrayList<Fragment> mFragmentArrayList = new ArrayList<>();  // fragment集合

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        
        mViewPager = (ViewPager) findViewById(R.id.vp);
        mTabLayout = (TabLayout) findViewById(R.id.tab_layout2);
        mTabLayout.setTabMode(TabLayout.MODE_FIXED);
        mFragmentArrayList.add(new Music());
        mFragmentArrayList.add(new NewsFragment());
        mFragmentArrayList.add(new Singer());
        MyNewAdapter adapter = new MyNewAdapter(getSupportFragmentManager(), mFragmentArrayList);
        mViewPager.setAdapter(adapter);

        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));  // 用这句话
          // 用  mViewPager.addOnPageChangeListener代替下面的,下面注释掉的源码里面会清除所有Item,造成显示不了文字以及图片
         //mTabLayout.setupWithViewPager(mViewPager); // 这里不要用这句话
        mTabLayout.addOnTabSelectedListener(this);

    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

效果图片 :

android,安卓,TabLayout + ViewPager + Fragment

---------------------------------------添加图片的另外一种实现方式(复杂不建议使用)------------------------------------>

1.首先 : adapter 代码 : (这个效果和上面是一样的)


public class MyViewPagerAdapter extends FragmentPagerAdapter {
    private String[] titles;
    private List<Fragment> fragments;
    Context mContext;
    public MyViewPagerAdapter(Context context,FragmentManager fm, String[] titles, List<Fragment> list) {
        super(fm);
        mContext = context;
        this.titles = titles;
        fragments = list;
    }

    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    @Override
    public int getCount() {
        return fragments.size();
    }

    public View getTabView(int position) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.tab_layout, null);
        ImageView iv_tab = (ImageView) view.findViewById(R.id.iv_tab); // 图片可以这样写 : 写一个数据保存id,如: images[position] ;
        TextView tv_tab = (TextView) view.findViewById(R.id.tv_tab);
        iv_tab.setImageResource(R.mipmap.ic_launcher);
        tv_tab.setText(titles[position]);
        return view;
    }

2 .再者布局代码 :

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/iv_tab"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:scaleType="fitXY"/>

    <TextView
        android:id="@+id/tv_tab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"/>
</LinearLayout>

3.最后 :

public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {

    ArrayList<Fragment> mFragments = new ArrayList<>();
    private String[] titles = new String[]{"待审批", "已审批"};
    private TabLayout mTableLayout;
    private ViewPager mViewPager;
    private int [] drawablws = new int[]{R.mipmap.ic_launcher};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTableLayout = (TabLayout) findViewById(R.id.tab);
        mViewPager = (ViewPager) findViewById(R.id.viewpager);


        mTableLayout.setOnTabSelectedListener(this);
        mFragments.add(new WaitApprovalFragment());
        mFragments.add(new ApprovalEndFragment());
        MyViewPagerAdapter myViewpagerAdapter = new MyViewPagerAdapter(this,getSupportFragmentManager(), titles, mFragments);
        mViewPager.setAdapter(myViewpagerAdapter);
        mTableLayout.setupWithViewPager(mViewPager);
        /**这段代码要在 mTableLayout.setupWithViewPager(mViewPager) 之后写......start.....*/
        for (int i = 0; i < mTableLayout.getTabCount(); i++) {
            TabLayout.Tab tab = mTableLayout.getTabAt(i);
            //设置自定义的标题
            if (tab != null) {
                tab.setCustomView(myViewpagerAdapter.getTabView(i));
            }
        }
        /**..................end................./

@Override
public void onTabSelected(TabLayout.Tab tab) {
    mViewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(TabLayout.Tab tab) {

}

@Override
public void onTabReselected(TabLayout.Tab tab) {

}

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android,安卓,TabLayout + ViewPager + Fragment

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