自定义简单视频播放器

package com.example.android_27__playvideo_camera_lx;

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

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

private SeekBar seekBar;
private MediaPlayer mediaPlayer;
private SurfaceView surfaceView;

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

//给进度条设置滑动的监听
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {

}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress=seekBar.getProgress();
//在当前位置播放
mediaPlayer.seekTo(progress);
}
});
}

public void isPlayOrPause(View view){
final ImageButton imageButton = (ImageButton) view;
if(mediaPlayer==null){
//播放内存卡中的文件
mediaPlayer = new MediaPlayer();
//设置音乐来源路劲
try {
//内存卡路劲，要加上file
mediaPlayer.setDataSource(this, Uri.parse("file://mnt/sdcard/mp/sister.mp4"));
//准备
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}

//将媒体播放器捕捉到的画面显示到surfaceview
mediaPlayer.setDisplay(surfaceView.getHolder());
//开始播放
mediaPlayer.start();
//把播放图标换成暂停图标
imageButton.setImageResource(android.R.drawable.ic_media_pause);
//获取音乐的总时长
int pd = mediaPlayer.getDuration();
//将进度条设置最大值为：音乐的总时长
seekBar.setMax(pd);
//实例化线程
new myThread().start();
}else if(mediaPlayer.isPlaying()){//判断是否正在播放
//暂停播放
mediaPlayer.pause();
imageButton.setImageResource(android.R.drawable.ic_media_play);
}else {
//开始播放
mediaPlayer.start();
imageButton.setImageResource(android.R.drawable.ic_media_pause);
}
}

class myThread extends Thread{
@Override
public void run() {
super.run();
while (seekBar.getProgress()<=seekBar.getMax()){
//获取音乐当前播放的位置
int cp = mediaPlayer.getCurrentPosition();
seekBar.setProgress(cp);
}

}
}

}

<!-- 读取内存卡权限 -->
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />