作为Android基础组件之一，大家对viewpager已经很熟悉了，网上也有很多使用viewpager来加载图片的案例。但是像微信那样点击图片，可以轮播显示图片和视频的例子却没找到。正巧项目中有需求，可以就花时间写了下，现在给一下核心代码，希望对有此需求的同学们起一个抛砖引玉的作用。话不多说了，上代码：
以下是initData的代码
public void initData() { //把聊天界面的图片和视频找出来，并加到数组中，并在 //并根据传进来的position来找到视频或图片在数组中的位置 for (int i = 0; i < MsgCount; i++) { Msg1 msg1 = fridenMessages.MessageList.get(i); if (msg1.getMsg().startsWith(ChatUtil.TAG_IMAGE) || msg1.getMsg().startsWith(ChatUtil.TAG_VIDEO)) { ImageUrl.add(msg1.getMsg()); //查看消息postion对应的图片位置 if (position == i) { position = ImageUrl.size() - 1; Log.i("TAG", "position=" + position); } } } Log.i("TAG", "position=" + position); //把要用到的view加到viewList中 for (int i = 0; i < ImageUrl.size(); i++) { if (ImageUrl.get(i).startsWith(ChatUtil.TAG_IMAGE)) { PhotoView photoView = new PhotoView(context); viewList.add(photoView); } else if (ImageUrl.get(i).startsWith(ChatUtil.TAG_VIDEO)) { View view1 = LayoutInflater.from(context).inflate(R.layout.activity_video_player, null); SurfaceVideoView videoView = (SurfaceVideoView) view1.findViewById(R.id.videoview); int screenWidth = getScreenWidth((Activity) context); int videoHight = (int) (screenWidth / (MediaRecorderBase.SMALL_VIDEO_WIDTH / (MediaRecorderBase.SMALL_VIDEO_HEIGHT * 1.0f))); // int videoHight = (int) (screenWidth)*4/3; videoView.getLayoutParams().height = videoHight; videoView.requestLayout(); View playStatus = view1.findViewById(R.id.play_status); View loading = view1.findViewById(R.id.loading); viewList.add(view1); } } adapter = new MyAdapter(); viewPager.setAdapter(adapter); if (position != -1) { viewPager.setCurrentItem(position); } } ``` public void initEvent() { //给viewPager设置监听 viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int arg0) { int childCount = viewPager.getChildCount();//viewPager得到页面的数量 //如果不是在原页面，让原来页面的视频停止播放 if(position != arg0){ position=arg0; StopVideo(); } // 遍历当前所有加载过的PhotoView，恢复所有图片的默认状态 for (int i = 0; i < childCount; i++) { View childAt = viewPager.getChildAt(i); try { if (childAt != null && childAt instanceof PhotoView) { PhotoView photoView = (PhotoView) childAt; photoView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() { @Override public void onPhotoTap(View view, float x, float y) { finish(); } @Override public void onOutsidePhotoTap() { } }); } } catch (Exception e) { e.printStackTrace(); } } if (ImageUrl.get(position).startsWith(ChatUtil.TAG_VIDEO)) { String body = ChatApplication.dbHelper.getVideoSdPath(ImageUrl.get(position)); String url[] = ImageUrl.get(position).substring(ChatUtil.TAG_VIDEO.length()).split("&&"); View childAt = viewList.get(arg0); SurfaceVideoView videoView = (SurfaceVideoView) childAt.findViewById(R.id.videoview); mVideoView = videoView; mPlayerStatus = childAt.findViewById(R.id.play_status); mLoading = childAt.findViewById(R.id.loading); Log.i("TAG", "videoUrl=" + body); setVideoUrl(body, url); //延迟50ms，让播放器播放视频时，让它暂停 Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { StopVideo(); } }, 50); } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } }); } public class MyAdapter extends PagerAdapter { @Override public int getCount() { return ImageUrl.size(); } @Override public View instantiateItem(ViewGroup container, int pos) { Log.i("TAG", "pos=" + pos); if (ImageUrl.get(pos).startsWith(ChatUtil.TAG_IMAGE)) { PhotoView photoView = (PhotoView) viewList.get(pos); container.addView(photoView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); String body[] = ImageUrl.get(pos).substring(ChatUtil.TAG_IMAGE.length()).split("&&"); Log.i("TAG", "<IMAGE>=" + body[0]); ImageLoader.getInstance().displayImage(body[0], photoView); photoView.setScaleType(ImageView.ScaleType.FIT_CENTER);//设置图片显示为充满全屏 photoView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() { @Override public void onPhotoTap(View view, float x, float y) { finish(); } @Override public void onOutsidePhotoTap() { } }); // photoView.setOnLongClickListener(longClickListener); } else if (ImageUrl.get(pos).startsWith(ChatUtil.TAG_VIDEO)) { View view1 = viewList.get(pos); SurfaceVideoView VideoView = (SurfaceVideoView) view1.findViewById(R.id.videoview); int screenWidth = getScreenWidth((Activity) context); int videoHight = (int) (screenWidth / (MediaRecorderBase.SMALL_VIDEO_WIDTH / (MediaRecorderBase.SMALL_VIDEO_HEIGHT * 1.0f))); // int videoHight = (int) (screenWidth)*4/3; VideoView.getLayoutParams().height = videoHight; VideoView.requestLayout(); View PlayerStatus = view1.findViewById(R.id.play_status); View Loading = view1.findViewById(R.id.loading); VideoView.setOnPreparedListener(ShowBigPictureActivity.this); VideoView.setOnPlayStateListener(ShowBigPictureActivity.this); VideoView.setOnErrorListener(ShowBigPictureActivity.this); VideoView.setOnClickListener(ShowBigPictureActivity.this); VideoView.setOnInfoListener(ShowBigPictureActivity.this); VideoView.setOnCompletionListener(ShowBigPictureActivity.this); container.addView(view1, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); String body = ChatApplication.dbHelper.getVideoSdPath(ImageUrl.get(pos)); String url[] = ImageUrl.get(pos).substring(ChatUtil.TAG_VIDEO.length()).split("&&"); //找到是点击聊天界面哪个视频进来的，将局部成员，付给类成员 if(pos==position) { mVideoView = VideoView; mPlayerStatus=PlayerStatus; mLoading=Loading; setVideoUrl(body,url); } } return viewList.get(pos); } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } } 以下是控制视频播放的接口： public void onCompletion(MediaPlayer mp) { onStateChanged(false); } @Override public boolean onError(MediaPlayer mp, int what, int extra) { return false; } @Override public boolean onInfo(MediaPlayer mp, int what, int extra) { switch (what) { case MediaPlayer.MEDIA_INFO_BAD_INTERLEAVING: // 音频和视频数据不正确 ConfigUtil.showShort(context, "视频数据不正确！"); break; case MediaPlayer.MEDIA_INFO_BUFFERING_START: if (!isFinishing()) mVideoView.pause(); break; case MediaPlayer.MEDIA_INFO_BUFFERING_END: if (!isFinishing()) mVideoView.start(); break; case MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START: if (DeviceUtils.hasJellyBean()) { mVideoView.setBackground(null); } else { mVideoView.setBackgroundDrawable(null); } break; } return false; } @Override public void onStateChanged(boolean isPlaying) { mPlayerStatus.setVisibility(isPlaying ? View.GONE : View.VISIBLE); } @Override public void onPrepared(MediaPlayer mp) { mVideoView.setVolume(SurfaceVideoView.getSystemVolumn(this)); mVideoView.start(); mLoading.setVisibility(View.GONE); }
我觉得轮播视频的难点在于viewpager只能播放一个视频，而每个viewItem都有继承自SurfaceView的SurfaceVideoView控件， 我让原先页面的SurfaceViedeoView停止播放，并把新页面的SurfaceVideoView付给mVideoView，然后就可以对选中页面的视频进行控制了。
下面来张效果图：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。