节操播放器拓展之仿微信拖拽关闭视频

拖拽的逻辑一定是在onTouch中去处理了，因节操播放器需处理播放进度以及UI逻辑，所以原有父类JCVideoPlayerStandard中已重写onTouch方法。现在要做的是单独封装一个类用来拓展拖拽关闭视频功能。

贴出关键代码

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (currentStatus == STATUS_RESETTING)
            return false;
        int id = v.getId();
        if (id == fm.jiecao.jcvideoplayer_lib.R.id.surface_container) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    mDownX = event.getRawX();
                    mDownY = event.getRawY();
                    addIntoVelocity(event);
                    break;
                case MotionEvent.ACTION_MOVE:
                    addIntoVelocity(event);
                    int deltaY = (int) (event.getRawY() - mDownY);
                    //手指往上滑动
                    if (deltaY <= DRAG_GAP_PX && currentStatus != STATUS_MOVING)
                        return super.onTouchEvent(event);
                    //手指往下滑动，开始缩放
                    if (deltaY > DRAG_GAP_PX || currentStatus == STATUS_MOVING) {
                        moveView(event.getRawX(), event.getRawY());
                        return true;
                    }
                    break;
                case MotionEvent.ACTION_CANCEL:
                case MotionEvent.ACTION_UP:
                    if (event.getAction() == MotionEvent.ACTION_UP) {
                        startDismissControlViewTimer();
                        if (mChangePosition) {
                            int duration = getDuration();
                            int progress = mSeekTimePosition * 100 / (duration == 0 ? 1 : duration);
                            bottomProgressBar.setProgress(progress);
                        }
                        if (!mChangePosition && !mChangeVolume) {
                            onEvent(JCUserActionStandard.ON_CLICK_BLANK);
                            onClickUiToggle();
                        }
                    }
                    //--------------------------------------------
                    if (currentStatus != STATUS_MOVING)
                        return super.onTouchEvent(event);
                    final float mUpX = event.getRawX();
                    final float mUpY = event.getRawY();

                    float vY = computeYVelocity();//松开时必须释放VelocityTracker资源
                    if (vY >= 1200 || Math.abs(mUpY - mDownY) > screenHeight / 4) {
                        //下滑速度快，或者下滑距离超过屏幕高度的一半，就关闭
                        if (iAnimClose != null) {
                            iAnimClose.onPictureRelease();
                        }
                    } else {
                        resetReviewState(mUpX, mUpY);
                    }
                    break;
            }
        } 　　　　　//设置播放进度　　　　  else if (id == fm.jiecao.jcvideoplayer_lib.R.id.progress) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    cancelDismissControlViewTimer();
                    break;
                case MotionEvent.ACTION_UP:
                    startDismissControlViewTimer();
                    break;
            }
        }
        return super.onTouch(v, event);
    }

手指下滑的时候移动控件，移动过程利用ViewHelper对控件进行缩放，缩放范围自己控制。

    //移动View
    private void moveView(float movingX, float movingY) {
        if (currentShowView == null)
            return;
        currentStatus = STATUS_MOVING;
        float deltaX = movingX - mDownX;
        float deltaY = movingY - mDownY;
        float scale = 1f;
        float alphaPercent = 1f;
        if (deltaY > 0) {
            scale = 1 - Math.abs(deltaY) / screenHeight;
            alphaPercent = 1 - Math.abs(deltaY) / (screenHeight / 2);
        }

        ViewHelper.setTranslationX(currentShowView, deltaX);
        ViewHelper.setTranslationY(currentShowView, deltaY);
        scaleView(scale);
        setBackgroundColor(getBlackAlpha(alphaPercent));
    }

下滑距离超过屏幕一半，可通过接口回调在onPictureRelease中处理关闭的逻辑。

写完测试，发现拖拽过程中背景是一片黑色，尝试将activity的主题设置为半透明主题，就解决啦！

By LiYing

原文地址：https://www.cnblogs.com/widgetbox/p/10342350.html