Android移动应用开发之ViewPager

Posted 2022-10-10 Icy Hunter

文章目录

• 主要文件目录
• • MainActivity
  • MyAdapter
  • activity_main.xml
  • layout1.xml
  • 运行

ViewPager的实现效果如下：

就是实现左滑右滑实现布局页面的跳转

话不多说，上代码。

主要文件目录

MainActivity

package zufe.scq.hunter;

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;

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


public class MainActivity extends AppCompatActivity 
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LayoutInflater lf =  getLayoutInflater().from(this);
        View view1 = lf.inflate(R.layout.layout1, null);
        View view2 = lf.inflate(R.layout.layout2, null);
        View view3 = lf.inflate(R.layout.layout3, null);

        List<View> viewList = new ArrayList<>();
        viewList.add(view1);
        viewList.add(view2);
        viewList.add(view3);

        ViewPager viewPager = findViewById(R.id.vp);
        MyAdapter myAdapter = new MyAdapter(viewList);
        viewPager.setAdapter(myAdapter);
    

MyAdapter

package zufe.scq.hunter;

import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import java.util.List;

public class MyAdapter extends PagerAdapter 

    private List<View> mListView;

    public MyAdapter(List<View> mListView)
        this.mListView = mListView;
    

    @NonNull
    @Override
//    将给定位置的view添加到ViewGroup容器中，创建并显示出来
    public Object instantiateItem(@NonNull ViewGroup container, int position) 
        container.addView(mListView.get(position), 0);
        return mListView.get(position);
    

    @Override
    public int getCount() 
        return mListView.size();
    

    @Override
//    判断视图是否是同一个
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) 
        return view == object;
    

    @Override
//    销毁视图
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) 
        container.removeView(mListView.get(position));
    

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

layout1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="layout1"
        android:textSize="30sp"
        />

</LinearLayout>

layout2.xml和layout3.xml和上面雷同，复制粘贴改个名字就好了。

运行

能够实现页面滑动跳转。