android 一个视频播放的demo

Android本来也是闲着无聊自己自学的，做了几个小的demo，今天又在网上扒拉一堆，做了一个播放视频的demo

代码都很简单，大家可以举一反三啊

package com.zking.administrator.g160628_android28_playvideo;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceView;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private MediaPlayer mediaPlayer;
    private SeekBar sb_main_bar;
    private SurfaceView sv_main_surface;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sb_main_bar = (SeekBar) findViewById(R.id.sb_main_bar);
        sv_main_surface = (SurfaceView) findViewById(R.id.sv_main_surface);

        //给进度条设置滑动监听
        sb_main_bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                 //获取当前进度条的位置
                int currentPosition=seekBar.getProgress();
                //跳转到某个位置进行播放
                mediaPlayer.seekTo(currentPosition);
            }
        });



    }
    public void playOrPause(View view){
        final ImageButton imageButton= (ImageButton) view;

         //实例化MediaPlayer
        if(mediaPlayer==null){
            //mediaPlayer = MediaPlayer.create(this, R.raw.s8);
            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                 String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();

                mediaPlayer=new MediaPlayer();

                //设置音频流的类型
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                //设置音源
                try {
                    mediaPlayer.setDataSource(this, Uri.parse("file://"+sdPath+"/dcim/camera/VID_20170717_184535.mp4"));
                    mediaPlayer.prepare();
                   // mediaPlayer.prepareAsync();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                //将画面展示到 SurfaceView上
                mediaPlayer.setDisplay(sv_main_surface.getHolder());

                mediaPlayer.start();
                //暂停图标
                imageButton.setImageResource(android.R.drawable.ic_media_pause);

                //获取音乐的播放时间
                int time=mediaPlayer.getDuration();

                //设置进度条的最大值 为  音乐的播放时间
                sb_main_bar.setMax(time);

                new MyThread().start();
                //设置准备监听
//                mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
//                    @Override
//                    public void onPrepared(MediaPlayer mp) {
//
//                    }
//                });
            }

        }else if(mediaPlayer.isPlaying()){
             mediaPlayer.pause();
            //播放图标
            imageButton.setImageResource(android.R.drawable.ic_media_play);
        }else{
            mediaPlayer.start();
            //暂停图标
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
        }
    }

    class MyThread extends Thread{
        @Override
        public void run() {
            super.run();
            while(sb_main_bar.getProgress()<sb_main_bar.getMax()){
                 //获取音乐当前的播放位置
                int currentPosition=mediaPlayer.getCurrentPosition();
                sb_main_bar.setProgress(currentPosition);
            }
        }
    }




}

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

    <SurfaceView
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:id="@+id/sv_main_surface"
        />



    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sb_main_bar"
        />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_media_play"
        android:onClick="playOrPause"
        />




</LinearLayout>

需要加权限，就是读取内存卡的权限

大家拜拜咯