ViewPager

来源：互联网发布：2017优化设计化学答案编辑：程序博客网时间：2024/05/22 14:09

1.activity_main.xml

<android.support.v4.view.ViewPager    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/viewpager"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v4.view.PagerTabStrip        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="top"        android:background="@color/background_material_dark"        android:textColor="#fff"        android:paddingTop="4dp"        android:paddingBottom="4dp"/></android.support.v4.view.ViewPager>

2.fragment_page.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:id="@+id/img"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:scaleType="fitCenter"        android:contentDescription="@string/app_name"/></LinearLayout>

3.MainActivity

import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.ActionBar;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {    MyFragmentStatePagerAdapter mMyFragmentStatePagerAdapter;    ViewPager mViewPager;    String[] titles={"1","2","3","4","5"};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ActionBar ab=this.getSupportActionBar();        if(ab!=null){            ab.hide();        }        mMyFragmentStatePagerAdapter=new MyFragmentStatePagerAdapter(getSupportFragmentManager());        mViewPager= (ViewPager) findViewById(R.id.viewpager);        mViewPager.setAdapter(mMyFragmentStatePagerAdapter);    }    public class MyFragmentStatePagerAdapter extends FragmentPagerAdapter{        public MyFragmentStatePagerAdapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int position) {            Fragment fragment=new MyFragment();            Bundle args=new Bundle();            args.putInt(MyFragment.WHICH,position);            fragment.setArguments(args);            return fragment;        }        @Override        public int getCount() {            return titles.length;        }        @Override        public CharSequence getPageTitle(int position) {            return titles[position];        }    }    public static class MyFragment extends Fragment{        public static final String WHICH="which";        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {            View v=inflater.inflate(R.layout.fragment_page,container,false);            Bundle args=getArguments();            ImageView iv= (ImageView) v.findViewById(R.id.img);            int which=args.getInt(WHICH);            int resId=0;            switch (which){                case 0:                    resId=R.drawable.mei;                    break;                case 1:                    resId=R.drawable.s;                    break;                case 2:                    resId=R.drawable.s1;                    break;                case 3:                    resId=R.drawable.s2;                    break;                case 4:                    resId=R.drawable.s3;                    break;            }            iv.setImageResource(resId);            return v;        }    }}

使用ViewPager的一般步骤

1.创建一个包含ViewPager的主界面布局。需要标题栏，则可将PagerTabStrip或PagerTitleStrip嵌套在ViewPager中
2.实现一个FragmentPagerAdapter或FragmentPagerStateAdapter的子类，并覆盖其中的getItem和getCount方法
3.创建实现的PagerAdapter的对象，并调用ViewPager的setAdapter将它作为ViewPager的Adapter。

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