Android_ViewPager+Fragment实现页面滑动和底部导航栏

概述1、Xml中底部导航栏由一个RadioGroup组成，其上是ViewPager。   <?xmlversion="1.0"encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:app="http://schemas.android.com/apkes

1、Xml中底部导航栏由一个RadioGroup组成，其上是VIEwPager。

 

 

 

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    xmlns:tools="http://schemas.androID.com/tools"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="horizontal"    androID:background="#FFFFFF"    tools:context=".MainActivity">    <linearLayout        androID:ID="@+ID/main_toplinear"        androID:layout_wIDth="match_parent"        androID:layout_height="70dp"        androID:background="@drawable/riple_btn_nocorner"        androID:gravity="center">        <ImageVIEw            androID:layout_wIDth="60dp"            androID:layout_height="60dp"            androID:layout_margin="5dp"            androID:src="@drawable/icon"></ImageVIEw>        <TextVIEw            androID:layout_wIDth="wrap_content"            androID:layout_height="wrap_content"            androID:text="滴滴嗒小账本"            androID:textcolor="#9E6E1E"            androID:textSize="25dp"></TextVIEw>    </linearLayout>    <VIEw        androID:layout_wIDth="match_parent"        androID:layout_height="0.5dp"        androID:layout_below="@+ID/main_toplinear"        androID:background="#232"></VIEw>    <VIEw        androID:layout_wIDth="match_parent"        androID:layout_height="0.5dp"        androID:layout_above="@+ID/main_radio_group"        androID:background="#232"></VIEw>    <RadioGroup        androID:ID="@+ID/main_radio_group"        androID:layout_wIDth="match_parent"        androID:layout_height="70dp"        androID:layout_alignParentBottom="true"        androID:background="#EDDEF7"        androID:gravity="center"        androID:orIEntation="horizontal">        <Radiobutton            androID:layout_wIDth="wrap_content"            androID:layout_height="match_parent"            androID:layout_weight="1"            androID:button="@null"            androID:text="记录"            androID:gravity="center"            androID:textSize="25dp"            androID:textcolor="#9E6E1E"            androID:background="@drawable/radio"            androID:ID="@+ID/main_rd_cord"            ></Radiobutton>        <Radiobutton            androID:ID="@+ID/main_rd_inout"            androID:layout_wIDth="5dp"            androID:layout_height="match_parent"            androID:layout_weight="1"            androID:gravity="center"            androID:textSize="25dp"            androID:textcolor="#9E6E1E"            androID:text="收支"            androID:background="@drawable/radio"            androID:button="@null"></Radiobutton>        <Radiobutton            androID:ID="@+ID/main_rd_my"            androID:layout_wIDth="wrap_content"            androID:layout_height="match_parent"            androID:layout_weight="1"            androID:button="@null"            androID:gravity="center"            androID:textSize="25dp"            androID:textcolor="#9E6E1E"            androID:background="@drawable/radio"            androID:text="我的"            ></Radiobutton>    </RadioGroup>    <androIDx.vIEwpager.Widget.VIEwPager        androID:ID="@+ID/main_vIEwpager"        androID:layout_wIDth="match_parent"        androID:layout_height="match_parent"        androID:layout_below="@+ID/main_toplinear"        androID:layout_above="@ID/main_radio_group"></androIDx.vIEwpager.Widget.VIEwPager></relativeLayout>

　　

2、编写几个页面的Fragment。

3、编写FragmentPagerAdapter，重写getItem和getCount方法。

 

package com.example.dIDIDa_corder;import androIDx.annotation.NonNull;import androIDx.fragment.app.Fragment;import androIDx.fragment.app.FragmentManager;import androIDx.fragment.app.FragmentPagerAdapter;public class MyFragPageAdapter extends FragmentPagerAdapter {    private int PAGE_NUM = 3;    private final int PAGE_CORD = 0;    private final int PAGE_INOUT = 1;    private final int PAGE_MY = 2;    private CordFragment cordFragment = null;    private MyItemFragment myItemFragment = null;    private InOutFragment inOutFragment = null;    public MyFragPageAdapter(@NonNull FragmentManager fm) {        super(fm);        cordFragment = new CordFragment();        myItemFragment = new MyItemFragment();        inOutFragment = new InOutFragment();    }    @NonNull    @OverrIDe    public Fragment getItem(int position) {        switch (position) {            case PAGE_CORD: {                return cordFragment;            }            case PAGE_INOUT: {                return inOutFragment;            }            case PAGE_MY: {                return myItemFragment;            }            default:                return null;        }    }    @OverrIDe    public int getCount() {        return PAGE_NUM;    }}

 

　　

 

4、在MainActivity中实现VIEwPager.OnPagechangelistener和RadioGroup.OnCheckedchangelistener接口。

 

package com.example.dIDIDa_corder;import androIDx.appcompat.app.AppCompatActivity;import androIDx.vIEwpager.Widget.VIEwPager;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.Adapter;import androID.Widget.Radiobutton;import androID.Widget.RadioGroup;import androID.Widget.TextVIEw;public class MainActivity extends AppCompatActivity implements VIEwPager.OnPagechangelistener, RadioGroup.OnCheckedchangelistener{    private MyFragPageAdapter myFragPageAdapter;    private VIEwPager vIEwPager;    private TextVIEw textVIEw;    private RadioGroup radioGroup;    private Radiobutton radiobutton_crod;    private Radiobutton radiobutton_inout;    private Radiobutton radiobutton_myitem;    private int PAGE_NUM = 3;    private final int PAGE_CORD = 0;    private final int PAGE_INOUT = 1;    private final int PAGE_MY = 2;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        myFragPageAdapter=new MyFragPageAdapter(getSupportFragmentManager());        bindVIEws();        radiobutton_crod.setChecked(true);    }    private voID bindVIEws(){        radiobutton_crod=findVIEwByID(R.ID.main_rd_cord);        radiobutton_inout=findVIEwByID(R.ID.main_rd_inout);        radiobutton_myitem=findVIEwByID(R.ID.main_rd_my);        radioGroup=findVIEwByID(R.ID.main_radio_group);        radioGroup.setonCheckedchangelistener(this);        vIEwPager= findVIEwByID(R.ID.main_vIEwpager);        vIEwPager.setAdapter(myFragPageAdapter);        vIEwPager.addOnPagechangelistener(this);        vIEwPager.setCurrentItem(0);    }    @OverrIDe    public voID onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @OverrIDe    public voID onPageSelected(int position) {    }    @OverrIDe    public voID onPageScrollStateChanged(int state) {       if (state==2){           switch (vIEwPager.getCurrentItem()){               case PAGE_CORD:                   radiobutton_crod.setChecked(true);                   break;               case PAGE_INOUT:                   radiobutton_inout.setChecked(true);                   break;               case PAGE_MY:                   radiobutton_myitem.setChecked(true);                   break;           }       }    }    @OverrIDe    public voID onCheckedChanged(RadioGroup group, int checkedID) {        switch (checkedID){            case R.ID.main_rd_cord:{                vIEwPager.setCurrentItem(PAGE_CORD);                break;            }            case R.ID.main_rd_inout:{                vIEwPager.setCurrentItem(PAGE_INOUT);                break;            }            case R.ID.main_rd_my:{                vIEwPager.setCurrentItem(PAGE_MY);                break;            }        }    }}

　　

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