Android使用ViewPager加載圖片和輪播視頻

更新時間：2020年07月23日 09:23:11 作者：Huige1113

這篇文章主要為大家詳細介紹了Android使用ViewPager加載圖片和輪播視頻，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

作為Android基礎組件之一，大家對viewpager已經(jīng)很熟悉了，網(wǎng)上也有很多使用viewpager來加載圖片的案例。但是像微信那樣點擊圖片，可以輪播顯示圖片和視頻的例子卻沒找到。正巧項目中有需求，可以就花時間寫了下，現(xiàn)在給一下核心代碼，希望對有此需求的同學們起一個拋磚引玉的作用。話不多說了，上代碼：

以下是initData的代碼

public void initData() {
 //把聊天界面的圖片和視頻找出來，并加到數(shù)組中，并在
 //并根據(jù)傳進來的position來找到視頻或圖片在數(shù)組中的位置
 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對應的圖片位置
  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() {
 //給viewPager設置監(jiān)聽
 viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

  @Override
  public void onPageSelected(int arg0) {

  int childCount = viewPager.getChildCount();//viewPager得到頁面的數(shù)量
  //如果不是在原頁面，讓原來頁面的視頻停止播放
  if(position != arg0){
   position=arg0;
   StopVideo();
  }

  // 遍歷當前所有加載過的PhotoView，恢復所有圖片的默認狀態(tài)

  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);
   //延遲50ms，讓播放器播放視頻時，讓它暫停
   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);//設置圖片顯示為充滿全屏
  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("&&");
  //找到是點擊聊天界面哪個視頻進來的，將局部成員，付給類成員
  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;
 }
 }
以下是控制視頻播放的接口：
 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:
  // 音頻和視頻數(shù)據(jù)不正確
  ConfigUtil.showShort(context, "視頻數(shù)據(jù)不正確！");
  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);

 }

我覺得輪播視頻的難點在于viewpager只能播放一個視頻，而每個viewItem都有繼承自SurfaceView的SurfaceVideoView控件，我讓原先頁面的SurfaceViedeoView停止播放，并把新頁面的SurfaceVideoView付給mVideoView，然后就可以對選中頁面的視頻進行控制了。

下面來張效果圖：