在 Android 6.0 或者之后的版本中要主动请求用户授权，具体方法，可以参考我之前写的这篇文章
《Android 6.0+ SMSManager 使用示例 发送短信》

实例的代码如下：

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.VideoView;

import java.io.File;

public class MainActivity extends Activity implements View.OnClickListener {

    private static final String TAG = "MainActivity";

    private Button play;
    private Button pause;
    private Button replay;
    private VideoView videoView;

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

        play = findViewById(R.id.play);
        pause = findViewById(R.id.pause);
        replay = findViewById(R.id.replay);
        videoView = findViewById(R.id.video_view);

        play.setOnClickListener(this);
        pause.setOnClickListener(this);
        replay.setOnClickListener(this);

        initMediaPlayer();
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            moveTaskToBack(true);
        }
        return super.onKeyUp(keyCode, event);
    }

    private void initMediaPlayer() {
        try {
            File file = new File(Environment.getExternalStorageDirectory(), "movie.mp4");
            videoView.setVideoPath(file.getPath());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.play:
                if (!videoView.isPlaying()) {
                    videoView.start();
                }
                break;
            case R.id.pause:
                if (videoView.isPlaying()) {
                    videoView.pause();
                }
                break;
            case R.id.replay:
                if (videoView.isPlaying()) {
                    videoView.resume();
                }
                break;
            default:
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (null != videoView) {
            videoView.suspend();
        }
    }
}

示例使用的布局文件如下：

<?xml version="1.0" encoding="utf-8"?>
<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=".SplashActivity"
    android:orientation="vertical"
    >

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        >
        <Button
            android:id="@+id/play"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/play"
            />

        <Button
            android:id="@+id/pause"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/pause"
            />

        <Button
            android:id="@+id/replay"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/replay"
            />
    </LinearLayout>


</LinearLayout>

本文参考自 《Android 第一行代码》