Android中fragment+viewpager实现布局

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

1.先布局实现mian.xml

<?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"
  tools:context="com.bwei.fragment.MainActivity"> 

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

  <RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/pager"
    android:layout_centerHorizontal="true"
    android:orientation="horizontal"
    android:background="#ccc"
    > 

    <RadioButton
      android:id="@+id/radio0"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:checked="true"
      android:button="@null"
      android:layout_weight="1"
      android:text="微信"
      android:drawableTop="@mipmap/ic_launcher_round"
      android:gravity="center"
      /> 

    <RadioButton
      android:id="@+id/radio1"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:button="@null"
      android:layout_weight="1"
      android:text="通讯录"
      android:drawableTop="@mipmap/ic_launcher_round"
      android:gravity="center"
      /> 

    <RadioButton
      android:id="@+id/radio2"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:button="@null"
      android:layout_weight="1"
      android:text="发现"
      android:drawableTop="@mipmap/ic_launcher_round"
      android:gravity="center" />
    <RadioButton
      android:id="@+id/radio3"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:button="@null"
      android:layout_weight="1"
      android:text="我的"
      android:drawableTop="@mipmap/ic_launcher_round"
      android:gravity="center"/>
  </RadioGroup>
</RelativeLayout>

2.创建3个fragment 要继承Fragment类v4包下的

public class FragmentThree extends Fragment {
  @Nullable
  @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
     //引入布局文件
    View view = inflater.inflate(R.layout.fragmentthree, null);
    return view;
  }
}

3.创建fragment 相对应的布局文件

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

  <TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="230dp"
    android:text="one" />
</RelativeLayout>

4.创建适配器继承FragmentPagerAdapter

package com.bwei.fragment; 

import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter; 

import java.util.List; 

public class MyAdapter extends FragmentPagerAdapter {
  private List<Fragment> fragments;
  private Context context;
  //构造方法
  public MyAdapter(FragmentManager fm, List<Fragment> fragments, Context context) {
    super(fm);
    this.fragments = fragments;
    this.context = context;
  }
  //得到item条目
  @Override
  public Fragment getItem(int position) {
    return fragments.get(position);
  } 

  //得到数量
  @Override
  public int getCount() {
    return fragments.size();
  }
}

5.在mainActivity实现效果

package com.bwei.fragment; 

import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.IdRes;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast; 

import java.util.ArrayList;
import java.util.List; 

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener,ViewPager.OnPageChangeListener { 

  private ViewPager vPager;
  private List<Fragment> fragments;
  private FragmentManager fm;
  private RadioGroup mRadioGroup;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控件
    initView();
    initDate();
  } 

  private void initView() {
    vPager=(ViewPager) findViewById(R.id.pager);
    vPager.setOnPageChangeListener(this);
    mRadioGroup=(RadioGroup) findViewById(R.id.radioGroup1);
    mRadioGroup.setOnCheckedChangeListener(this);
  } 

  private void initDate() {
    fragments=new ArrayList<Fragment>();
    //实例化Fragment
    FragmentOne fragmentOne = new FragmentOne();
    FragmentTwo fragmentTwo = new FragmentTwo();
    FragmentThree fragmentThree = new FragmentThree(); 

    //添加到集合
    fragments.add(fragmentOne);
    fragments.add(fragmentTwo);
    fragments.add(fragmentThree); 

    //得到getSupportFragmentManager()的管理器
    fm = getSupportFragmentManager();
    //得到适配器
    MyAdapter myAdapter = new MyAdapter(fm, fragments, this);
    //设置适配器
    vPager.setAdapter(myAdapter);
  } 

  //ViewPager.OnPageChangeListener监听事件
  @Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 

  } 

  @Override
  public void onPageSelected(int position) { 

    for (int i = 0; i <fragments.size() ; i++) {
      RadioButton radiobutton = (RadioButton) mRadioGroup.getChildAt(i);
      if (i==position) {
        radiobutton.setChecked(true);
        //设置选中的颜色
        radiobutton.setBackgroundColor(Color.RED);
      }else {
        radiobutton.setChecked(false);
        radiobutton.setBackgroundColor(Color.BLACK);
        radiobutton.setBackgroundColor(Color.BLACK);
      }
    }
  } 

  @Override
  public void onPageScrollStateChanged(int state) { 

  } 

  //RadioGroup的监听事件 

  @Override
  public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) { 

    for (int j = 0; j <fragments.size() ; j++) {
      //得到radiobutton
      RadioButton radiobutton = (RadioButton) mRadioGroup.getChildAt(j);
      int id = radiobutton.getId();
      Toast.makeText(this,id+"", Toast.LENGTH_SHORT).show();
      //判断radiobutton的id是否等于选中的id
      if (radiobutton.getId()==i) {
        //设置当前页
        vPager.setCurrentItem(j);
      }
    }
  }
}

6.最后的效果图

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。