ViewPager和Fragment组合 v4包下的页面切换

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ViewPager和Fragment组合 v4包下的页面切换

/*

*主页面下

*/

//-------------主页面下----------------------

package com.example.viewpagerfragment;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

//注意继承的是FragmentActivity在这里用的是android.support.v4.app.Fragment包下的Fragment

public class MainActivity extends FragmentActivity implements OnClickListener {

    private ViewPager vp;
   private TextView tv_textview1;
   private TextView tv_textview2;
   private TextView tv_textview3;
   private TextView tv_textview4;

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

        //找到控件ViewPager
        vp = (ViewPager) findViewById(R.id.vp);
        tv_textview1 = (TextView) findViewById(R.id.tv_textview1);
        tv_textview2 = (TextView) findViewById(R.id.tv_textview2);
        tv_textview3 = (TextView) findViewById(R.id.tv_textview3);
        tv_textview4 = (TextView) findViewById(R.id.tv_textview4);
        //设置ViewPager的适配器
        vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {

           @Override
           public int getCount() {
               // 返回fragment页数
               return 4;
           }

           @Override
           public Fragment getItem(int arg0) {
               //创建fragment
               Fragment fragment=null;
               switch (arg0) {
               case 0:
                   fragment=new Fragment1();
                   break;
               case 1:
                   fragment=new Fragment2();
                   break;
               case 2:
                   fragment=new Fragment3();
                   break;
               case 3:
                   fragment=new Fragment4();
                   break;

               default:
                   break;
               }
               //返回fragment
               return fragment;
           }
       });
        //设置ViewPager的滑动监听     并实现3个方法
        vp.setOnPageChangeListener(new OnPageChangeListener() {

           @Override
           public void onPageSelected(int arg0) {
               switch (arg0) {
               case 0:
                   //当fragment为第一张页面时，textview设置为红色背景，其他设置为白色背景
                   tv_textview1.setBackgroundColor(Color.RED);
                   tv_textview2.setBackgroundColor(Color.WHITE);
                   tv_textview3.setBackgroundColor(Color.WHITE);
                   tv_textview4.setBackgroundColor(Color.WHITE);
                   break;
               case 1:
                   tv_textview1.setBackgroundColor(Color.WHITE);
                   tv_textview2.setBackgroundColor(Color.RED);
                   tv_textview3.setBackgroundColor(Color.WHITE);
                   tv_textview4.setBackgroundColor(Color.WHITE);
                   break;
               case 2:
                   tv_textview1.setBackgroundColor(Color.WHITE);
                   tv_textview2.setBackgroundColor(Color.WHITE);
                   tv_textview3.setBackgroundColor(Color.RED);
                   tv_textview4.setBackgroundColor(Color.WHITE);
                   break;
               case 3:
                   tv_textview1.setBackgroundColor(Color.WHITE);
                   tv_textview2.setBackgroundColor(Color.WHITE);
                   tv_textview3.setBackgroundColor(Color.WHITE);
                   tv_textview4.setBackgroundColor(Color.RED);
                   break;

               default:
                   break;
               }

           }

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


           }

           @Override
           public void onPageScrollStateChanged(int arg0) {


           }
       });
        //设置textView的监听
        tv_textview1.setOnClickListener(this);
        tv_textview2.setOnClickListener(this);
        tv_textview3.setOnClickListener(this);
        tv_textview4.setOnClickListener(this);

        //设置当进入activity时的默认页面
        tv_textview1.setBackgroundColor(Color.RED);
        vp.setCurrentItem(0);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

//实现textview的监听的方法
   @Override
   public void onClick(View v) {
       switch (v.getId()) {
       case R.id.tv_textview1:
           //viewpager设置为第一fragment
           vp.setCurrentItem(0);
           break;
       case R.id.tv_textview2:
           vp.setCurrentItem(1);
           break;
       case R.id.tv_textview3:
           vp.setCurrentItem(2);
           break;
       case R.id.tv_textview4:
           vp.setCurrentItem(3);
           break;

       default:
           break;
       }

   }

}
//--------------------main.xml布局文件--------------------------

<LinearLayout 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"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:id="@+id/vp"></android.support.v4.view.ViewPager>
    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">
        <TextView android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="40dp"
        android:id="@+id/tv_textview1"
        android:text="首页"
        android:gravity="center"/>
        <TextView android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="40dp"
        android:id="@+id/tv_textview2"
        android:text="首页1"
        android:gravity="center"/>
        <TextView android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="40dp"
        android:id="@+id/tv_textview3"
        android:text="首页2"
        android:gravity="center"/>
        <TextView android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="40dp"
        android:id="@+id/tv_textview4"
        android:text="首页3"
        android:gravity="center"/>

    </LinearLayout>


</LinearLayout>

//-----------------------创建-Fragment1---------------------

package com.example.viewpagerfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment{
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
           Bundle savedInstanceState) {
       View view=inflater.inflate(R.layout.frgment_item1, null);
       return view;
   }

}
//-----------------创建-------Fragment2-----------------------------

package com.example.viewpagerfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment2 extends Fragment{
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
           Bundle savedInstanceState) {
       View view=inflater.inflate(R.layout.frgment_item2, null);
       return view;
   }

}

//----------------创建------Fragment3---------------------

package com.example.viewpagerfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment3 extends Fragment{
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
           Bundle savedInstanceState) {
       View view=inflater.inflate(R.layout.frgment_item3, null);
       return view;
   }

}

//-----------------创建-----Fragment4----------------------

package com.example.viewpagerfragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment4 extends Fragment{
   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
           Bundle savedInstanceState) {
       View view=inflater.inflate(R.layout.frgment_item4, null);
       return view;
   }

}

//--------------创建布局文件----frgment_item1.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:orientation="vertical" >
    <TextView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#00ffff"
        android:text="1"
        android:gravity="center"
        />

</LinearLayout>

//-----------------创建布局文件 frgment_item2.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:orientation="vertical" >
    <TextView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ff00ff"
        android:text="2"
        android:gravity="center"
        />

</LinearLayout>

//------------创建布局文件 frgment_item2.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:orientation="vertical" >
     <TextView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ffff00"
        android:text="3"
        android:gravity="center"
        />

</LinearLayout>

//--------------------创建布局文件    frgment_item4.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:orientation="vertical" >
    <TextView android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ff0000"
        android:text="4"
        android:gravity="center"
        />

</LinearLayout>

//--------------完了-----------------------

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原文地址：https://www.cnblogs.com/changyiqiang/p/5808247.html