Android Tab实现之ViewPager+FragmentActivity

最新推荐文章于 2025-07-17 16:06:44 发布

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本文介绍如何在Android应用中使用v4版本的Fragment配合ViewPager实现页面的平滑切换，包括初始化布局、配置FragmentAdapter、设置页面监听等功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1.界面需要extends FragmentActivity

2. 使用的是v4版本的Fragment

3.viewpager设置的adapter是FragmentPagerAdapter

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <include layout="@layout/bottom_menu" />

</LinearLayout>

package com.example.baidu.mydemos.demo1;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.widget.RadioGroup;

import com.example.baidu.mydemos.R;

import java.util.ArrayList;

/**
 * Created by baidu on 15/12/31.
 */


//通过ViewPager和Fragment实现
public class DemoOneMenuThreeActivity extends FragmentActivity {
    private ViewPager viewPager;
    private FragmentPagerAdapter fragmentPagerAdapter;
    private ArrayList<Fragment> arrayListFragments;
    private RadioGroup rg_bottom;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.demo1_3);
        rg_bottom = (RadioGroup) findViewById(R.id.rg_bottom);
        rg_bottom.check(R.id.rb_1);
        initFragments();
        viewPager = (ViewPager) findViewById(R.id.vp);
        fragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(fragmentPagerAdapter);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position) {
                    case 0:
                        rg_bottom.check(R.id.rb_1);
                        break;
                    case 1:
                        rg_bottom.check(R.id.rb_2);
                        break;
                    case 2:
                        rg_bottom.check(R.id.rb_3);
                        break;
                }

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        rg_bottom.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case R.id.rb_1:
                        viewPager.setCurrentItem(0);
                        break;
                    case R.id.rb_2:
                        viewPager.setCurrentItem(1);
                        break;
                    case R.id.rb_3:
                        viewPager.setCurrentItem(2);
                        break;
                }
            }
        });
    }

    class MyFragmentPagerAdapter extends FragmentPagerAdapter {

        public MyFragmentPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return arrayListFragments.get(position);
        }

        @Override
        public int getCount() {
            return arrayListFragments.size();
        }
    }

    public void initFragments() {
        arrayListFragments = new ArrayList<Fragment>();
        arrayListFragments.add(new FragmentOneContent());
        arrayListFragments.add(new FragmentTwoContent());
        arrayListFragments.add(new FragmentThreeContent());
    }
}