Android简单的Fragment+Viewpager切换(可滑动和点击切换)

我的项目录如下：

第一步：创建activity_bottom.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="wrap_content"
    android:layout_alignParentBottom="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal"
        android:background="#ffffff">
        <RelativeLayout
            android:id="@+id/main_layout"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_weight="1">
            <ImageView
                android:id="@+id/main_iamgeview"
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:src="@drawable/main2"
                android:layout_centerHorizontal="true"/>
            <TextView
                android:id="@+id/main_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="首页"
                android:layout_below="@+id/main_iamgeview"
                android:layout_centerHorizontal="true"
                android:textSize="12dp"
                android:textColor="#707070"/>
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/more_layout"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_weight="1">
            <ImageView
                android:id="@+id/more_iamgeview"
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:src="@drawable/more1"
                android:layout_centerHorizontal="true"/>
            <TextView
                android:id="@+id/more_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="更多"
                android:layout_below="@+id/more_iamgeview"
                android:layout_centerHorizontal="true"
                android:textSize="12dp"
                android:textColor="#707070"/>
        </RelativeLayout>

        <RelativeLayout
            android:id="@+id/mine_layout"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_weight="1">
            <ImageView
                android:id="@+id/mine_iamgeview"
                android:layout_width="35dp"
                android:layout_height="35dp"
                android:src="@drawable/my1"
                android:layout_centerHorizontal="true"/>
            <TextView
                android:id="@+id/mine_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="我的"
                android:layout_below="@+id/mine_iamgeview"
                android:layout_centerHorizontal="true"
                android:textSize="12dp"
                android:textColor="#707070"/>
        </RelativeLayout>
    </LinearLayout>
</LinearLayout>

第二步：main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="50dp">
    </android.support.v4.view.ViewPager>
    <include layout="@layout/activity_bottom"/>
</RelativeLayout>

第三步：main_fragment(其他两个一样)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是首页"
        android:textColor="#000000"
        android:layout_centerInParent="true"/>
</RelativeLayout>

第四步：创建MainFragment(其他两个同理)

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.fragmentlayout.R;

public class MainFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.main_fragment, container, false);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
}

第五步：MainActivity

package com.example.fragmentlayout;

import android.graphics.Color;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.example.fragmentlayout.Fragment.MainFragment;
import com.example.fragmentlayout.Fragment.MineFragment;
import com.example.fragmentlayout.Fragment.MoreFragment;

import java.util.ArrayList;

public class MainActivity extends FragmentActivity implements View.OnClickListener {
    private TextView main_textview,more_textview,mine_textview;
    private ImageView main_imageview,more_imageview,mine_imageview;
    private RelativeLayout main_layout,more_layout,mine_layout;
    private Fragment mainFragment,moreFragment,mineFragment;
    private ArrayList<Fragment> mFragmentList;
    private FragmentPagerAdapter mFragmentPagerAdapter;
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);//删除自带标题栏(如果继承AppCompatActivity,不起效果,所以继承FragmentActivity)
        setContentView(R.layout.activity_main);
        initView();
        initViewPager();
        setSelected(0);//显示第一个Fragment (0代表mainFragment,1代表moreFragment,2代表mineFragment);
    }


    private void initView() {
        mViewPager=(ViewPager)findViewById(R.id.viewpager);

        main_imageview=(ImageView)findViewById(R.id.main_iamgeview);
        more_imageview=(ImageView)findViewById(R.id.more_iamgeview);
        mine_imageview=(ImageView)findViewById(R.id.mine_iamgeview);

        main_textview=(TextView)findViewById(R.id.main_textview);
        more_textview=(TextView)findViewById(R.id.more_textview);
        mine_textview=(TextView)findViewById(R.id.mine_textview);

        main_layout=(RelativeLayout)findViewById(R.id.main_layout);
        more_layout=(RelativeLayout)findViewById(R.id.more_layout);
        mine_layout=(RelativeLayout)findViewById(R.id.mine_layout);

        mainFragment=new MainFragment();
        moreFragment=new MoreFragment();
        mineFragment=new MineFragment();

        main_layout.setOnClickListener(this);
        more_layout.setOnClickListener(this);
        mine_layout.setOnClickListener(this);

        mFragmentList=new ArrayList<Fragment>();
        mFragmentList.add(mainFragment);
        mFragmentList.add(moreFragment);
        mFragmentList.add(mineFragment);
    }

    private void initViewPager() {
        //FragmentPagerAdapter缓存Fragment
        mFragmentPagerAdapter=new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return mFragmentList.get(position);
            }

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

        mViewPager.setAdapter(mFragmentPagerAdapter);

        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            //position当前页面，positionOffset当前页面偏移百分比，positionOffsetPixels当前页面偏移像素
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            //当前页面跳转另一个页面完毕调用
            @Override
            public void onPageSelected(int position) {
                initImageText();
                switch (position){
                    case 0:
                        main_imageview.setImageResource(R.drawable.main2);
                        main_textview.setTextColor(Color.parseColor("#707070"));
                        break;
                    case 1:
                        more_imageview.setImageResource(R.drawable.more2);
                        more_textview.setTextColor(Color.parseColor("#707070"));
                        break;
                    case 2:
                        mine_imageview.setImageResource(R.drawable.my2);
                        mine_textview.setTextColor(Color.parseColor("#707070"));
                        break;
                }
            }

            //state ==1的时表示正在滑动，state==2的时表示滑动完毕了，state==0的时表示什么都没做。
            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }


    private void setSelected(int i) {
        switch (i){
            case 0:
                mViewPager.setCurrentItem(0);
                break;
            case 1:
                mViewPager.setCurrentItem(1);
                break;
            case 2:
                mViewPager.setCurrentItem(2);
                break;
        }
    }

    @Override
    public void onClick(View v) {
        initImageText();
        switch (v.getId()){
            case R.id.main_layout:
                setSelected(0);
                main_imageview.setImageResource(R.drawable.main2);
                main_textview.setTextColor(Color.parseColor("#707070"));
                break;
            case R.id.more_layout:
                setSelected(1);
                more_imageview.setImageResource(R.drawable.more2);
                more_textview.setTextColor(Color.parseColor("#707070"));
                break;
            case R.id.mine_layout:
                setSelected(2);
                mine_imageview.setImageResource(R.drawable.my2);
                mine_textview.setTextColor(Color.parseColor("#707070"));
                break;
        }
    }

    //初始化图片和文字(未点击自定义的Tab下样式)
    private void initImageText() {
        main_imageview.setImageResource(R.drawable.main1);
        more_imageview.setImageResource(R.drawable.more1);
        mine_imageview.setImageResource(R.drawable.my1);

        main_textview.setTextColor(Color.parseColor("#dfdfdf"));
        more_textview.setTextColor(Color.parseColor("#dfdfdf"));
        mine_textview.setTextColor(Color.parseColor("#dfdfdf"));
    }

}