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结合Tab,ViewPager,Fragment实现简单分页滑动

2016-04-06 11:13 555 查看
在APP设计当中,使用ViewPager和Fragment来实现分页滑动并不少见,该设计可以利用少量的空间来实现多内容的展示。效果图如下:





以下是实现该功能的代码:

MainActivity

public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;

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

initView();
}

//tab点击事件
private ActionBar.TabListener mListener = new ActionBar.TabListener() {
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
if (viewPager != null) {
viewPager.setCurrentItem(tab.getPosition()); //设置当前显示的fragment
}
}

@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {

}

@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {

}
};

private void initView() {
final ActionBar actionBar = getSupportActionBar();
ActionBar.Tab tab1 = actionBar.newTab(); //新建tab
ActionBar.Tab tab2 = actionBar.newTab();
tab1.setText("Tab1");
tab2.setText("Tab2");
tab1.setTabListener(mListener);  //设置tab监听事件,必须在actionBar.addTab语句之前,否则报错
tab2.setTabListener(mListener);
actionBar.addTab(tab1);
actionBar.addTab(tab2);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);//设置模式

viewPager = (ViewPager) findViewById(R.id.viewPager);
ArrayList<Fragment> fragments = new ArrayList<>(2);  //添加两个fragment或者更多
MyFragment fragment1 = new MyFragment(R.layout.fragment_tab1);
MyFragment fragment2 = new MyFragment(R.layout.fragment_tab2);
fragments.add(fragment1);
fragments.add(fragment2);
viewPager.setAdapter(new FragmentAdapter(getSupportFragmentManager(), fragments)); //设置适配器
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { //页面滑动后tab跟着移动
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position); //设置当前tab选中的位置
}

@Override
public void onPageScrollStateChanged(int state) {

}
});
}
}


MyFragement

public class MyFragment extends Fragment {
private int resource;                //需要解析的布局资源

public MyFragment(int resource) {
this.resource = resource;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(resource, container, false); //解析布局,此处第三个参数应为false,否则会返回父视图的布局,导致OOM
return v;
}
}


FragmentAdapter

//适配器,与ListView等所需适配器的设置类似
public class FragmentAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> fragments;

public FragmentAdapter(FragmentManager fm, ArrayList<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}

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

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


至于XML的实现相对简单:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.viewpager.MainActivity">

<android.support.v4.view.ViewPager
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/viewPager"
>

</android.support.v4.view.ViewPager>
</RelativeLayout>
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