如何在 VideoView 中使用手势滑动功能播放视频
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【中文标题】如何在 VideoView 中使用手势滑动功能播放视频【英文标题】：How to Play Video using Gesture Swipe function in VideoView 【发布时间】：2016-08-16 09:10:55 【问题描述】：我有VideoView，我想使用手势滑动功能播放视频。当用户从右向左滑动播放下一个视频以及从左向右滑动播放上一个视频时。
它工作正常，但是当我当时滑动数组列表的最后一项时，我的应用程序崩溃了（array index out of bound）。
这是我的代码：
class ActivitySwipeDetector implements View.OnTouchListener
static final String logTag = "ActivitySwipeDetector";
private Activity activity;
static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
public ActivitySwipeDetector(Activity activity)
this.activity = activity;
public void onRightSwipe()
LOGE(logTag, "RightToLeftSwipe!");
if (mProgressDialog == null)
mProgressDialog = ViewUtils.createProgressDialog(mActivity);
mProgressDialog.show();
else
mProgressDialog.show();
i++;
if (i < mArrayList.size())
LOGD("Index:: :: :: ::", String.valueOf(i));
Uri videoUri = Uri.parse(mArrayList.get(i));
videoview.setVideoURI(videoUri);
videoview.start();
else
mProgressDialog.dismiss();
public void onLeftSwipe()
LOGE(logTag, "LeftToRightSwipe!");
if (mProgressDialog == null)
mProgressDialog = ViewUtils.createProgressDialog(mActivity);
mProgressDialog.show();
else
mProgressDialog.show();
i--;
if (i > mArrayList.size())
Uri videoUri = Uri.parse(mArrayList.get(i));
videoview.setVideoURI(videoUri);
videoview.start();
else
mProgressDialog.dismiss();
public void onDownSwipe()
LOGE(logTag, "onTopToBottomSwipe!");
public void onUpSwipe()
LOGE(logTag, "onBottomToTopSwipe!");
finish();
public boolean onTouch(View v, MotionEvent event)
switch (event.getAction())
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
return true;
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// swipe horizontal?
if (Math.abs(deltaX) > Math.abs(deltaY))
if (Math.abs(deltaX) > MIN_DISTANCE)
// left or right
if (deltaX > 0)
this.onRightSwipe();
return true;
if (deltaX < 0)
this.onLeftSwipe();
return true;
else
LOGE(logTag, "Horizontal Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
// swipe vertical?
else
if (Math.abs(deltaY) > MIN_DISTANCE)
// top or down
if (deltaY < 0)
this.onDownSwipe();
return true;
if (deltaY > 0)
this.onUpSwipe();
return true;
else
LOGE(logTag, "Vertical Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
return true;
return false;
【问题讨论】：
任何人有解决这个问题的想法？ 【参考方案1】：试试下面的代码。
class ActivitySwipeDetector implements View.OnTouchListener
static final String logTag = "ActivitySwipeDetector";
private Activity activity;
static final int MIN_DISTANCE = 100;
private float downX, downY, upX, upY;
public ActivitySwipeDetector(Activity activity)
this.activity = activity;
public void onRightSwipe()
LOGE(logTag, "RightToLeftSwipe!");
if (mProgressDialog == null)
mProgressDialog = ViewUtils.createProgressDialog(mActivity);
mProgressDialog.show();
else
mProgressDialog.show();
i++;
if(i>=mArrayList.size())
i=0;
if (i < mArrayList.size())
LOGD("Index:: :: :: ::", String.valueOf(i));
Uri videoUri = Uri.parse(mArrayList.get(i));
videoview.setVideoURI(videoUri);
videoview.start();
else
mProgressDialog.dismiss();
public void onLeftSwipe()
LOGE(logTag, "LeftToRightSwipe!");
if (mProgressDialog == null)
mProgressDialog = ViewUtils.createProgressDialog(mActivity);
mProgressDialog.show();
else
mProgressDialog.show();
i--;
if(i < 0)
i= mArrayList.size()-1;
if (i > mArrayList.size())
Uri videoUri = Uri.parse(mArrayList.get(i));
videoview.setVideoURI(videoUri);
videoview.start();
else
mProgressDialog.dismiss();
public void onDownSwipe()
LOGE(logTag, "onTopToBottomSwipe!");
public void onUpSwipe()
LOGE(logTag, "onBottomToTopSwipe!");
finish();
public boolean onTouch(View v, MotionEvent event)
switch (event.getAction())
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
return true;
case MotionEvent.ACTION_UP:
upX = event.getX();
upY = event.getY();
float deltaX = downX - upX;
float deltaY = downY - upY;
// swipe horizontal?
if (Math.abs(deltaX) > Math.abs(deltaY))
if (Math.abs(deltaX) > MIN_DISTANCE)
// left or right
if (deltaX > 0)
this.onRightSwipe();
return true;
if (deltaX < 0)
this.onLeftSwipe();
return true;
else
LOGE(logTag, "Horizontal Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
// swipe vertical?
else
if (Math.abs(deltaY) > MIN_DISTANCE)
// top or down
if (deltaY < 0)
this.onDownSwipe();
return true;
if (deltaY > 0)
this.onUpSwipe();
return true;
else
LOGE(logTag, "Vertical Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
return true;
return false;
【讨论】：
还是出现异常？ 检查两个方向都工作或只有一个方向不工作。 完美，现在你可以检查你的值是否等于0，然后在if语句之前分配i =mArrayList.length()，再加一个if 你能简单描述一下吗？ 让我们continue this discussion in chat。以上是关于如何在 VideoView 中使用手势滑动功能播放视频的主要内容，如果未能解决你的问题，请参考以下文章
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