Android笔记（3）pagerslidingtabstrip二级导航

1.在build.gradle（Module app）中添加包

dependencies {    compile 'com.astuetz:pagerslidingtabstrip:1.0.1'}

2.布局文件中使用

<com.astuetz.PagerSlidingTabStrip    android:id="@+id/tabs"    android:layout_width="match_parent"    android:layout_height="48dip" /><android.support.v4.view.ViewPager    android:id="@+id/viewpager"    android:layout_width="match_parent"    android:layout_height="wrap_content"/>

3.在activity中使用

public class Activity extends AppCompatActivity{    private PagerSlidingTabStrip pagersliding;    private ViewPager viewpager;    private Fragment1 fragment1=null;    private Fragment2 fragment2=null;//要用几个fragment就写几个    //获取当前屏幕的密度    private DisplayMetrics dm;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_campus);        init();    }        private void init() {        dm = getResources().getDisplayMetrics();//获取屏幕密度        viewpager=(ViewPager)findViewById(R.id.viewpager);        viewpager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));        pagersliding = (PagerSlidingTabStrip) findViewById(R.id.tabs);        pagersliding.setViewPager(viewpager);        imageButton=(ImageButton)findViewById(R.id.ib_return);        imageButton.setOnClickListener(this);    }    private void setpagerstyle() {        pagersliding.setShouldExpand(true); // 设置Tab是自动填充满屏幕的        pagersliding.setDividerColor(Color.TRANSPARENT); // 设置Tab的分割线是透明的        // 设置Tab底部线的高度        pagersliding.setUnderlineHeight((int) TypedValue.applyDimension(                TypedValue.COMPLEX_UNIT_DIP, 1, dm));        // 设置Tab Indicator的高度        pagersliding.setIndicatorHeight((int) TypedValue.applyDimension(                TypedValue.COMPLEX_UNIT_DIP, 4, dm));        // 设置Tab标题文字的大小        pagersliding.setTextSize((int) TypedValue.applyDimension(                TypedValue.COMPLEX_UNIT_SP, 16, dm));        pagersliding.setIndicatorColor(Color.parseColor("#45c01a"));// 设置Tab Indicator的颜色        // 设置选中Tab文字的颜色 (这是自定义的一个方法)        //pagersliding.setSelectedTextColor(Color.parseColor("#45c01a"));        pagersliding.setTabBackground(0); // 取消点击Tab时的背景色    }}//自定义ViewPagerAdapter子类    private class MyPagerAdapter extends FragmentPagerAdapter {        private String[] titles = {"fragment1","fragment2"};//显示在二级导航上的标题文字        public MyPagerAdapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            switch (position) {                case 0:                    if (fragment1 == null) {                        fragment1 = new CampusFragment(1);                    }                    return fragment1;                case 1:                    if (fragment2 == null) {                        fragment2 = new CampusFragment(2);                    }                    return fragment2;                default:                    return null;            }        }        @Override        public int getCount() {            return titles.length;        }        @Override        public CharSequence getPageTitle(int position) {            return titles[position];        }    }

4.创建Fragment1,Fragment2类

public class Fragment1 extends Fragment{private View view=null;    private Context context;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment1, container, false);        context = getActivity();        return view;    }}

public class Fragment2 extends Fragment{private View view=null;    private Context context;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = inflater.inflate(R.layout.fragment2, container, false);        context = getActivity();        return view;    }}

5.创建fragment1.xml,fragment2.xml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"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"></LinearLayout>