【达内课程】ViewPager

创建3个类似的布局，分别命名为

page_one，page_two，page_three

<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"
    tools:context=".ui.Main3Activity"
    android:gravity="center"
    android:background="#006400">

    <TextView
        android:id="@+id/tv_page_one"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Page 01"
        android:textColor="@android:color/white"
        android:textSize="18dp"/>

</LinearLayout>

Activity

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;

import com.example.xx.myapplication2.R;

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

public class Main3Activity extends AppCompatActivity {
    private ViewPager viewPager;
    private PagerAdapter adapter;
    private List<View> pages;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        pages = new ArrayList<>();
        pages.add(getLayoutInflater().inflate(R.layout.page_one,null));
        pages.add(getLayoutInflater().inflate(R.layout.page_two,null));
        pages.add(getLayoutInflater().inflate(R.layout.page_three,null));

        viewPager = findViewById(R.id.viewpager);
        adapter = new InnerPagerAdapter();
        viewPager.setAdapter(adapter);
    }

    private class InnerPagerAdapter extends PagerAdapter{
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            //添加第position个view对象，并添加到容器container中，并返回
            View view = pages.get(position);
            container.addView(view);
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            //将第position个view从container中移除走
            View view = pages.get(position);
            container.removeView(view);
        }

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

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
    }
}

效果图

栗子

基于这个栗子做的
https://blog.csdn.net/u010356768/article/details/78998922

xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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"/>

    <LinearLayout
        android:id="@+id/rg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal"
        android:background="#e5e5e5">

        <Button
            android:id="@+id/btn_home"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="首页"
            android:drawableTop="@drawable/home_selector"
            android:textColor="@drawable/text_selector"
            android:drawablePadding="5dp"
            android:background="@null"
            />

        <Button
            android:id="@+id/btn_location"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="位置"
            android:drawableTop="@drawable/location_selector"
            android:textColor="@drawable/text_selector"
            android:drawablePadding="5dp"
            android:background="@null"/>

        <Button
            android:id="@+id/btn_cart"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="购物车"
            android:drawableTop="@drawable/cart_selector"
            android:textColor="@drawable/text_selector"
            android:drawablePadding="5dp"
            android:background="@null"/>

        <Button
            android:id="@+id/btn_user"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="我的"
            android:drawableTop="@drawable/user_selector"
            android:textColor="@drawable/text_selector"
            android:drawablePadding="5dp"
            android:background="@null"/>
    </LinearLayout>
</RelativeLayout>

activity

public class RadioButtonActivity extends FragmentActivity implements ViewPager.OnPageChangeListener{
    private Button btn_home;
    private Button btn_location;
    private Button btn_cart;
    private Button btn_user;
    private ViewPager viewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radio_button);

        btn_home = findViewById(R.id.btn_home);
        btn_location = findViewById(R.id.btn_location);
        btn_cart = findViewById(R.id.btn_cart);
        btn_user = findViewById(R.id.btn_user);
        viewPager = findViewById(R.id.viewpager);

        InnerClassOnClickListener innerClassOnClickListener = new InnerClassOnClickListener();
        btn_home.setOnClickListener(innerClassOnClickListener);
        btn_location.setOnClickListener(innerClassOnClickListener);
        btn_cart.setOnClickListener(innerClassOnClickListener);
        btn_user.setOnClickListener(innerClassOnClickListener);
        btn_home.setEnabled(false);

        InnerFragmentPagerAdapter adapter = new InnerFragmentPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(this);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        switch (position){
            case 0:
                select(btn_home);
                break;
            case 1:
                select(btn_location);
                break;
            case 2:
                select(btn_cart);
                break;
            case 3:
                select(btn_user);
                break;
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    private class InnerFragmentPagerAdapter extends FragmentPagerAdapter{

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

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = null;
            switch (position){
                case 0:
                    fragment = new OneFragment();
                    break;
                case 1:
                    fragment = new TwoFragment();
                    break;
                case 2:
                    fragment = new ThreeFragment();
                    break;
                case 3:
                    fragment = new FourFragment();
                    break;
            }
            return fragment;
        }

        @Override
        public int getCount() {
            return 4;
        }
    }



    private class InnerClassOnClickListener implements View.OnClickListener{

        @Override
        public void onClick(View view) {
            switch (view.getId()){
                case R.id.btn_home:
                    select(btn_home);
                    viewPager.setCurrentItem(0);
                    break;
                case R.id.btn_location:
                    select(btn_location);
                    viewPager.setCurrentItem(1);
                    break;
                case R.id.btn_cart:
                    select(btn_cart);
                    viewPager.setCurrentItem(2);
                    break;
                case R.id.btn_user:
                    select(btn_user);
                    viewPager.setCurrentItem(3);
                    break;
            }
        }
    }

    private void select(Button button){
        btn_home.setEnabled(true);
        btn_location.setEnabled(true);
        btn_cart.setEnabled(true);
        btn_user.setEnabled(true);

        button.setEnabled(false);

        Toast.makeText(RadioButtonActivity.this,button.getText(),Toast.LENGTH_SHORT).show();
    }
}

其中的fragment

public class OneFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //通过xml布局得到需要显示的view对象
        View view = inflater.inflate(R.layout.page_one,null);
        //返回view对象
        return view;
    }
}

效果图