前文： 

桃词典 Peach Dictionary 简易英语词典app开发 安卓软件开发 Part 1

导航：

桃词典 Peach Dictionary 简易英语词典app开发 安卓软件开发 The End 导航页及收尾工作

2.视频背景

（1）在res文件夹下新建raw文件夹。

 （2）将准备好的视频素材放入raw文件夹。

(3)进行UI布局和代码处理。

activity_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MainActivity">

    <VideoView
        android:id="@+id/video_background"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:alpha="1"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp" />




</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java 

 package com.example.peachdictionary;

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.ActivityInfo;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.widget.VideoView;

 public class MainActivity extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         //设置此界面为竖屏
         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
         videobackground();

     }

     private void videobackground() {

         //视频背景
         final VideoView videoview = findViewById(R.id.video_background);
         final String videopath = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.background).toString();
         videoview.setVideoPath(videopath);
         videoview.start();
         videoview.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
             @Override
             public void onPrepared(MediaPlayer mp) {
                 mp.start();
                 mp.setLooping(true);
             }
         });

         videoview.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
             @Override
             public void onCompletion(MediaPlayer mediaPlayer) {
                 videoview.setVideoPath(videopath);
                 videoview.start();
             }
         });

     }
 }

实现效果：