1.添加引用

implementation 'com.yanzhenjie:permission:2.0.3'

2.注册权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication4">


    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MyApplication4">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

3.开始播放 

package com.example.myapplication4;


import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.MediaController;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

import com.yanzhenjie.permission.AndPermission;
import com.yanzhenjie.permission.runtime.Permission;

import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {
    private VideoView videoview;

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

        videoview = findViewById(R.id.videoinfo);

        AndPermission.with(this).runtime()
                .permission(Permission.READ_PHONE_STATE)
                .permission(Permission.Group.STORAGE)
                .onGranted(permissions -> {
                    //初始化
                    //设置视频控制器
                    videoview.setMediaController(new MediaController(this));
                    //播放完成回调
                    videoview.setOnCompletionListener(new MyPlayerOnCompletionListener());
                    //设置视频路径
                    //videoView.setVideoURI(uri);
                    videoview.setVideoPath("/storage/emulated/0/ShortVideo/record.mp4");
                    //开始播放视频
                    videoview.start();
                })
                .onDenied(permissions -> {
                    android.os.Process.killProcess(android.os.Process.myPid());
                })
                .start();
    }

    class MyPlayerOnCompletionListener implements MediaPlayer.OnCompletionListener {
        @Override
        public void onCompletion(MediaPlayer mp) {
            Toast.makeText(MainActivity.this, "播放完成了", Toast.LENGTH_SHORT).show();
        }
    }


}

4.布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="match_parent">

    <VideoView
        android:id="@+id/videoinfo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

end