最简单的fragment左右滑动测试代码

最新推荐文章于 2025-10-12 11:34:41 发布

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本文介绍了一个使用Android中ViewPager和Fragment的示例应用。通过继承FragmentActivity并利用ViewPager和FragmentPagerAdapter，实现了滑动切换不同Fragment的功能。

mainactivity.java

//必须继承FragmentActivity才能用getSupportFragmentManager()
public class MainActivity extends FragmentActivity {
	private ViewPager pager;
	private PagerAdapter adapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		pager = (ViewPager) findViewById(R.id.vp_content);
		adapter = new PagerAdapter(getSupportFragmentManager());
		pager.setAdapter(adapter);
		pager.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int arg0) {
				pager.setCurrentItem(arg0);
			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {

			}

			@Override
			public void onPageScrollStateChanged(int arg0) {

			}
		});
		pager.setCurrentItem(0);
	}
	
	class PagerAdapter extends FragmentPagerAdapter {
		private List<Fragment> list_fragments;

		public PagerAdapter(FragmentManager fm) {
			super(fm);
			list_fragments = new ArrayList<Fragment>();
			list_fragments.add(new FragmentA());
			list_fragments.add(new FragmentB());
			list_fragments.add(new FragmentC());
			list_fragments.add(new FragmentD());
		}

		@Override
		public Fragment getItem(int arg0) {
			return list_fragments.get(arg0);
		}

		@Override
		public int getCount() {
			return list_fragments != null ? list_fragments.size() : 0;
		}

	}
}

其中一个FragmentA.java

public class FragmentA extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, 
			Bundle savedInstanceState) {
		View mView = inflater.inflate(R.layout.fragment_content, null);
		TextView tv = (TextView) mView.findViewById(R.id.tv);
		tv.setText("FragmentA");
		return mView;
	}
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.oyb.fragmentdemo.MainActivity"
    tools:ignore="MergeRootFrame" >

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

</LinearLayout>

fragment_content.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:gravity="center"
        android:textSize="18sp" />

</LinearLayout>