（原创）视频播放器的手势控制工具类

最近在做一个视频播放器

现在市场上，一个比较完善的视频播放器

大概具有以下功能：

快进、快退、声音、亮度控制

这一次就根据这几个基础的功能

通过系统的手势控制类GestureDetector来完成

做了一个实用的工具类

只需要简单的配置

就可以实现对视频播放器控件的手势进行监听

工具类内部实现了相关功能，不需要视频播放器自己写

实现了代码解耦，也方便复用

下面就开始介绍这个工具类的使用，以及实现的原理。

先把工具类的实际代码贴上来

public class VideoGestureControlUtil {

    private static final String TAG = "VideoGestureControlUtil";
    private Context mContext;
    private GestureDetector mGestureDetector;//手势类
    private MyGestureListener myGestureListener;//手势监听
    private OnVideoControlListener videoControlListener;//视频View回调监听
    private Rect VideoViewRect = null;//视频控件范围

    //状态相关
    private static int SCROLL_FLAG = 0;//记录状态
    private static final int SCROLL_FLAG_RESET = 0;//初始状态，无任何操作
    private static final int SCROLL_FLAG_TOPBOTTOM_LEFT = 1;//左边屏幕上下滑动
    private static final int SCROLL_FLAG_TOPBOTTOM_RIGHT = 2;//右边屏幕上下滑动
    private static final int SCROLL_FLAG_LEFTRIGHT = 3;//左右滑动


    //拖动相关
    protected static final float FLIP_DISTANCE = 50;//确定滑动方向的最小滑动距离
    private int SCROLL_VIDEO_SCROLL_RANGE = 1000;//拖动范围 0~1000
    private float SCROLL_VIDEO_PLAY_RANGE = 0.25f;//视频可拖动部分的范围

    //视频进度相关
    private float SCROLL_VIDEO_PLAY_INDEX = 0f;//拖动的视频进度
    private double videoIndex = 0;//拖动的视频毫秒数
    private double newVideoIndex;//拖动结束后视频的位置，单位毫秒
    private double SCROLL_VIDEO_PLAYING_INDEX = 0;//视频播放位置
    private double SCROLL_VIDEO_PLAYING_INDEX_CATCH = 0;//缓存的视频播放位置(手指按下去的视频播放位置)
    private double SCROLL_VIDEO_LENTH = 0;//视频总长度 单位毫秒

    //声音和亮度相关
    private AudioManager systemService;
    private int SCROLL_VIDEO_VOICE_INDEX = 0;//拖动的视频声音
    private double SCROLL_VIDEO_LIGHT_INDEX = 0;//拖动的视频亮度
    private int SCROLL_VOICE_MAX = 0;//声音总长度
    private int SCROLL_LIGHT_MAX = 255;//亮度总长度
    private int SCREEN_LIGHT = 0;//屏幕亮度
    private int SCREEN_LIGHT_CATCH = 0;//缓存的屏幕亮度
    private int SCREEN_VOICE = 0;//音量大小

    //弹框部分
    private Dialog indexDialog;//弹框
    private View videoDialogView;//弹框View
    private ImageView indeximg;
    private LinearLayout indexll, voicell;
    private TextView indextv;
    private ImageView voiceLightImg;
    private SeekBar voiceLightsb;
    private WindowManager.LayoutParams indexDialogLp;
    private DisplayMetrics displayMetrics;


    public VideoGestureControlUtil(Context context, View view) {
        myGestureListener = new MyGestureListener();
        this.mContext = context;
        systemService = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
        SCROLL_VOICE_MAX = systemService.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        mGestureDetector = new GestureDetector(context, myGestureListener);
        mGestureDetector.setOnDoubleTapListener(myGestureListener);

        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        videoDialogView = layoutInflater.inflate(R.layout.video_gesture_dialog, null);
        indexll = videoDialogView.findViewById(R.id.indexll);
        voicell = videoDialogView.findViewById(R.id.voicell);
        indeximg = videoDialogView.findViewById(R.id.indeximg);
        indextv = videoDialogView.findViewById(R.id.indextv);
        voiceLightImg = videoDialogView.findViewById(R.id.voice_light_img);
        voiceLightsb = videoDialogView.findViewById(R.id.voice_light_sb);


        indexDialog = new Dialog(context);

        /*随意定义个Dialog*/
        Window dialogWindow = indexDialog.getWindow();
        /*实例化Window*/
        indexDialogLp = dialogWindow.getAttributes();
        /*实例化Window操作者*/
        indexDialogLp.x = 0; // 新位置X坐标
        indexDialogLp.y = 0; // 新位置Y坐标
        dialogWindow.setGravity(Gravity.CENTER);
        dialogWindow.getDecorView().setBackground(null);
        dialogWindow.setAttributes(indexDialogLp);

        /*放置属性*/
        indexDialog.setContentView(videoDialogView, new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
        dialogWindow.setDimAmount(0);
        dialogWindow.setBackgroundDrawableResource(android.R.color.transparent);

        try {
            int dividerID = indexDialog.getContext().getResources().getIdentifier("android:id/titleDivider", null, null);
            View divider = indexDialog.findViewById(dividerID);
            if (divider != null) {
                divider.setBackgroundColor(Color.TRANSPARENT);
            }
        } catch (Exception e) {
            //上面的代码，是用来去除Holo主题的蓝色线条
            e.printStackTrace();
        }
        indexDialog.setCanceledOnTouchOutside(false);

    }


    public boolean touch(MotionEvent event) {

        boo