最近闲来无事写了一个较为完整的视频播放器，但由于有了新的项目，就把这个搁浅了，就差一个横竖屏切换的时候切换不同的控制栏了，以及横屏的自动锁定了。

surfaceview的测量，视频缩略图

实现了双击横屏 单击控制栏的显示与隐藏，手势控制播放进度，屏幕亮度和音量的调节

重力切换横竖屏与点击切换横竖屏也解决了，手机固定屏幕重力切换失效也搞定了

由于并没有高度封装，很适合初学者，大神勿喷罗

package com.wyt.hcy.wyt_microclassroomapp;

import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.ThumbnailUtils;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.MediaController;
import android.widget.RelativeLayout;
import android.widget.SeekBar;
import android.widget.TextView;

import java.io.IOException;
import java.lang.ref.WeakReference;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import Utils.ProjectUtils;
import wseemann.media.FFmpegMediaMetadataRetriever;

/**
 * created by  hcy 2016.8.4
 * <p>
 * bug: 只有声音没有图片
 * cause:
 * 1.在用SurfaceView播放视频时，如果处理不当，会出现有声音无图像的问题，主要的原因是，
 * 在调用MediaPlayer开始播放视频时，SurfaceView却还未创建成功，
 * 解决办法是判断SurfaceView创建成功后再调用MediaPlayer的播放，
 * 通过surfaceHolder的addCallBack()方法来监听surfaceCreated。
 * 2.注意测量的时间 应该在prepare之后
 * 应为在视频初始化时获得视频的高宽都为0 ，
 * 这个必须要注意，必须播放后延时 修改view 大小
 * bug:手动切换与自动切换横竖屏的冲突：手动点击横竖屏切换，手机再横竖屏就没法驱使
 * bug:屏幕切换时能够流畅的播放
 * bug:双击全屏
 * bug:横屏的锁屏机制
 * bug:手势操作:调节音量、亮度、快进、快退
 * bug:检测系统屏幕旋转的开关
 * bug:横竖屏切换不同风格的控制栏
 * bug:缓存进度与下载进度
 * bug:
 */

public class VideoPlayerActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener, MediaPlayer.OnInfoListener, MediaPlayer.OnPreparedListener, MediaPlayer.OnSeekCompleteListener, MediaPlayer.OnVideoSizeChangedListener, MediaController.MediaPlayerControl, View.OnTouchListener, View.OnClickListener {
    private static final String TAG = "VideoPlayerActivity";
    private Display display;
    private SurfaceHolder surfaceHolder;//监控在底层表面上发生的事情
    private SurfaceView surfaceView;
    private MediaPlayer mediaPlayer;
    private int videoWidth;
    private int videoHeight;
    private MyHandler mHandler;
    private static final int MEASURE_VIDEO_SIZE = 1;//测量视频的大小
    private static final int CONTROLLER_AUTO_HIDE_TIME = 5000;//5s自动隐藏控制条
    private static final int PLAY_TIME = 0;
    private ImageView iv_play;
    private SeekBar seekbar;
    private TextView tv_start, tv_end;
    private ImageView iv_full;
    private ImageView imageView_main_show;//func:点击该按钮 ,按钮消失 ，视频播放
    private Timer timer;
    private SurfaceHolder currentSurfaceHolder;
    private boolean sennorFlag = true;
    private boolean stretch_flag = true;
    private int screenHeight;
    private int screenWidth;
    private SensorManager sm;
    private SensorManager sm2;
    private OrientationSensorListener listener;
    private OrientationSensorListener2 listener2;
    private Sensor sensor;
    private Sensor sensor2;
    private FrameLayout fl_controller;
    private String filepath;
    private ImageView iv_suolue;//缩略图
    private int currentPosition;//当前的播放位置
    private RelativeLayout rl_show;
    private ImageView iv_flag;
    private TextView tv_pro;
    /**
     * 手势控制
     */
    private GestureDetector gestureDetector;

    private ImageView iv_lock;


    public interface GestureOperationHelper {


        void SingleTap();
    }

    private GestureOperationHelper gestureOperationHelper;

    private static enum GestureOperationType {

        NONE,//无手势操作类型

        VOLUME,//音量

        BRIGHTNESS,//亮度

        FASTFORWARDORBACKWARD,//快进  快退

    }

    private GestureOperationType mGestureOperationType = GestureOperationType.NONE;

    private AudioManager manager;

    private ImageView iv_voice;


    /**
     * 为了结局点击surfaceview与控制器出现与隐藏的联动bug
     * func:等上一个Runnable执行完才会执行下一个Runnable
     */

    private Runnable mRunnable = new Runnable() {
        @Override
        public void run() {
            if (fl_controller.getVisibility() == View.VISIBLE) {
                fl_controller.setVisibility(View.GONE);
                // isTimeUp = true;
                if (imageView_main_show.getVisibility() == View.VISIBLE && imageView_main_show.isSelected()) {
                    imageView_main_show.setVisibility(View.GONE);
                }
            }
        }
    };

    /**
     * 控制模块的显示或者隐藏
     */
    private void showOrHideController() {
        if (rl_show.getVisibility() == View.VISIBLE) {
            rl_show.setVisibility(View.GONE);
            mHandler.removeMessages(11);
        }


        if (getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            //横屏的时候显现锁屏按钮

            iv_lock.setVisibility(View.VISIBLE);

        } else {
            iv_lock.setVisibility(View.GONE);
        }

        if (fl_controller.getVisibility() == View.VISIBLE) {


            fl_controller.setVisibility(View.GONE);

            iv_lock.setVisibility(View.GONE);
            if (imageView_main_show.getVisibility() == View.VISIBLE && imageView_main_show.isSelected()) {
                imageView_main_show.setVisibility(View.GONE);
            }
        } else {
            fl_controller.setVisibility(View.VISIBLE);
            mHandler.removeCallbacks(mRunnable);
            mHandler.postDelayed(mRunnable, CONTROLLER_AUTO_HIDE_TIME);


            if (mediaPlayer != null && mediaPlayer.isPlaying() && imageView_main_show.isSelected()) {

                imageView_main_show.setSelected(true);
                imageView_main_show.setVisibility(View.VISIBLE);
                Log.i("<<<???", imageView_main_show.isSelected() + "");
            }
        }


    }

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

        mHandler = new MyHandler(this);
        manager = (AudioManager) getSystemService(AUDIO_SERVICE);
        Log.i("TTTTT", "onCreate");
        initSurfaceView();
        initController();
        initGestureController();

    }

    /**
     * 初始化手势控制
     */

    private void initGestureController() {
        gestureOperationHelper = new GestureOperationHelper() {
            @Override
            public void SingleTap() {

            }
        };

        gestureDetector = new GestureDetector(VideoPlayerActivity.this, new GestureDetector.SimpleOnGestureListener() {


            //双击
            @Override
            public boolean onDoubleTap(MotionEvent e) {
                //双击横竖屏切换
                if (stretch_flag) {
                    //切换成横屏
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                    stretch_flag = false;
                } else {
                    //切换成竖屏
                    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                    stretch_flag = true;
                }
                return true;
            }

            @Override
            public void onShowPress(MotionEvent e) {
                super.onShowPress(e);
                showOrHideController();
            }

            /**
             * ,一次单独的轻击抬起操作,也就是轻击一下屏幕
             * @param e
             * @return
             */

            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                mHandler.postDelayed(mSwitchTitleRunnable, 200);
                return true;
            }

            @Override
            public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

                if (Math.abs(distanceX) > Math.abs(distanceY)) {
                    //如果X轴的绝对值大于Y轴的绝对值  说明此时在快进或者快退
                    Log.i("KKKKKK", "快进");
                    mGestureOperationType = GestureOperationType.FASTFORWARDORBACKWARD;
                } else {
                    if (e1.getX() < surfaceView.getWidth() / 2) {
                        //说名在屏幕的左侧,左侧调节亮度
                        Log.i("KKKKKK", "亮度");
                        mGestureOperationType = GestureOperationType.BRIGHTNESS;
                    } else {
                        //右侧调节音量
                        Log.i("KKKKKK", "音量");
                        mGestureOperationType = GestureOperationType.VOLUME;

                    }
                }


                return DealWithScrollGestureOperatio