上一篇中，我们实现了仿抖音上下翻页切换视频的效果，详见
【Android 进阶】仿抖音系列之翻页上下滑切换视频（一）
，这一篇，我们来实现抖音列表播放视频。
之前也在github上找到一个demo,
这是链接
，原理和我的一样，只是用起来比较麻烦。。。
先说下原理，这里用到了RecyclerView的onScrolled和onScrollStateChanged 监听，在onScrolled中判断当前可见的position，结合onScrollStateChanged中返回的当前RecyclerView的滑动状态，当是拖动和停止滚动时，可以播放；当是惯性滑动时，暂停播放。
关于RecyclerView3种滑动状态，RecyclerView.SCROLL_STATE_IDLE，RecyclerView.SCROLL_STATE_DRAGGING，RecyclerView.SCROLL_STATE_SETTLING，大家可以自行百度，这里不做过多的描述了。
rvList.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
firstVisibleItem = layoutManager.findFirstVisibleItemPosition();
lastVisibleItem = layoutManager.findLastVisibleItemPosition();
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
switch (newState) {
case RecyclerView.SCROLL_STATE_IDLE://停止滚动
/**在这里执行，视频的自动播放与停止*/
autoPlayVideo(recyclerView);
break;
case RecyclerView.SCROLL_STATE_DRAGGING://拖动
autoPlayVideo(recyclerView);
break;
case RecyclerView.SCROLL_STATE_SETTLING://惯性滑动
JZVideoPlayer.releaseAllVideos();
break;
}
}
});
布局就是一个RecyclerView，就不贴了，下面是Adapter
urlList = new ArrayList<>();
urlList.add("http://image.38.hn/public/attachment/201805/100651/201805181532123423.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803151735198462.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150923220770.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150922255785.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150920130302.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803141625005241.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803141624378522.mp4");
urlList.add("http://image.38.hn/public/attachment/201803/100651/201803131546119319.mp4");
videoAdapter = new ListVideoAdapter(urlList);
rvList.setLayoutManager(new LinearLayoutManager(ListActivity.this));
rvList.setAdapter(videoAdapter);
Adapter这里自己做了个封装，可以用原生或者其他封装比较好的，这里就不贴了
class ListVideoAdapter extends BaseRecAdapter<String, VideoViewHolder> {
public ListVideoAdapter(List<String> list) {
super(list);
}
@Override
public void onHolder(VideoViewHolder holder, String bean, int position) {
holder.mp_video.setUp(bean, JZVideoPlayerStandard.CURRENT_STATE_NORMAL);
if (position == 0) {
holder.mp_video.startVideo();
}
Glide.with(context).load(bean).into(holder.mp_video.thumbImageView);
holder.tv_title.setText("第" + position + "个视频");
}
@Override
public VideoViewHolder onCreateHolder() {
return new VideoViewHolder(getViewByRes(R.layout.item_video));
}
}
public class VideoViewHolder extends BaseRecViewHolder {
public View rootView;
public MyVideoPlayer mp_video;
public TextView tv_title;
public VideoViewHolder(View rootView) {
super(rootView);
this.rootView = rootView;
this.mp_video = rootView.findViewById(R.id.mp_video);
this.tv_title = rootView.findViewById(R.id.tv_title);
}
}
布局如下
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:textSize="18sp" />
<com.ch.doudemo.widget.MyVideoPlayer
android:id="@+id/mp_video"
android:layout_width="match_parent"
android:layout_height="500dp" />
</LinearLayout>
这里使用的是
JiaoZiVideoPlayer
，其中MyVideoPlayer 是之前公司项目需要，对其做的个性化定制，这里下面再说。
下来就是本篇的核心，通过判断可见项，暂停/播放视频，代码如下
/**
* 自动播放
*/
private void autoPlayVideo(RecyclerView recyclerView) {
if (firstVisibleItem == 0 && lastVisibleItem == 0 && recyclerView.getChildAt(0) != null) {
MyVideoPlayer videoView = null;
if (recyclerView != null && recyclerView.getChildAt(0) != null) {
videoView = recyclerView.getChildAt(0).findViewById(R.id.mp_video);
}
if (videoView != null) {
if (videoView.currentState == JZVideoPlayer.CURRENT_STATE_NORMAL || videoView.currentState == JZVideoPlayer.CURRENT_STATE_PAUSE) {
videoView.startVideo();
}
}
}
for (int i = 0; i <= lastVisibleItem; i++) {
if (recyclerView == null || recyclerView.getChildAt(i) == null) {
return;
}
MyVideoPlayer
videoView = recyclerView.getChildAt(i).findViewById(R.id.mp_video);
if (videoView != null) {
Rect rect = new Rect();
//获取视图本身的可见坐标，把值传入到rect对象中
videoView.getLocalVisibleRect(rect);
//获取视频的高度
int videoHeight = videoView.getHeight();
if (rect.top <= 100 && rect.bottom >= videoHeight) {
if (videoView.currentState == JZVideoPlayer.CURRENT_STATE_NORMAL || videoView.currentState == JZVideoPlayer.CURRENT_STATE_PAUSE) {
videoView.startVideo();
}
return;
}
JZVideoPlayer.releaseAllVideos();
} else {
JZVideoPlayer.releaseAllVideos();
}
}
}
顺便说一下，为啥用JiaoZiVideoPlayer，就是因为 JZVideoPlayer.releaseAllVideos();，一句代码就可以暂停所有的播放器，否则自己要实现这个还是比较麻烦的
到这里，大概功能已经实现了，下面说说定制化的功能。需要去掉原播放器的进度条、按钮，点击视频，全屏播放，再次点击取消全屏。
我的做法是添加一个透明度为0的布局，覆盖在播放器上，这样实际上点击的是我们添加的布局
这里有个小技巧，可以粘贴源码中的布局，重要的事情说三遍，不要修改文件名、不要修改文件名、不要修改文件名，找到相关布局，设置android:visibility=”gone”，这样我们的项目中的布局就会替换掉原来的布局。
完整代码如下
jz_layout_standard.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/black"
android:descendantFocusability="blocksDescendants">
<FrameLayout
android:id="@+id/surface_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<ImageView
android:id="@+id/thumb"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="#000000"
android:scaleType="fitCenter" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone">
<LinearLayout
android:id="@+id/layout_bottom"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="@drawable/jz_bottom_bg"
android:gravity="center_vertical"
android:orientation="horizontal"
android:visibility="invisible">
<TextView
android:id="@+id/current"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:text="00:00"
android:textColor="#ffffff" />
<SeekBar
android:id="@+id/bottom_seek_progress"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1.0"
android:background="@null"
android:max="100"
android:maxHeight="1dp"
android:minHeight="1dp"
android:paddingBottom="8dp"
android:paddingLeft="12dp"
android:paddingRight="12dp"
android:paddingTop="8dp"
android:progressDrawable="@drawable/jz_bottom_seek_progress"
android:thumb="@drawable/jz_bottom_seek_thumb" />
<TextView
android:id="@+id/total"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:textColor="#ffffff" />
<TextView
android:id="@+id/clarity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:paddingLeft="20dp"
android:text="clarity"
android:textAlignment="center"
android:textColor="#ffffff" />
<ImageView
android:id="@+id/fullscreen"
android:layout_width="52.5dp"
android:layout_height="fill_parent"
android:paddingLeft="14dp"
android:paddingRight="14dp"
android:scaleType="centerInside"
android:src="@drawable/jz_enlarge" />
</LinearLayout>
</LinearLayout>
<ProgressBar
android:id="@+id/bottom_progress"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="1.5dp"
android:layout_alignParentBottom="true"
android:max="100"
android:progressDrawable="@drawable/jz_bottom_progress" />
<ImageView
android:id="@+id/back_tiny"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_marginLeft="6dp"
android:layout_marginTop="6dp"
android:background="@drawable/jz_click_back_tiny_selector"
android:visibility="gone" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone">
<RelativeLayout
android:id="@+id/layout_top"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="@drawable/jz_title_bg"
android:gravity="center_vertical">
<ImageView
android:id="@+id/back"
android:layout_width="23dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:paddingLeft="12dp"
android:paddingStart="12dp"
android:scaleType="centerInside"
android:src="@drawable/jz_click_back_selector" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginEnd="12dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginStart="12dp"
android:layout_toEndOf="@+id/back"
android:layout_toLeftOf="@+id/battery_time_layout"
android:layout_toRightOf="@+id/back"
android:ellipsize="end"
android:maxLines="2"
android:textColor="#ffffff"
android:textSize="18sp" />
<LinearLayout
android:id="@+id/battery_time_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginEnd="14dp"
android:layout_marginRight="14dp"
android:gravity="center_vertical"
android:orientation="vertical">
<ImageView
android:id="@+id/battery_level"
android:layout_width="23dp"
android:layout_height="10dp"
android:layout_gravity="center_horizontal"
android:background="@drawable/jz_battery_level_10" />
<TextView
android:id="@+id/video_current_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center_vertical"
android:maxLines="1"
android:textColor="#ffffffff"
android:textSize="12.0sp" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
<ProgressBar
android:id="@+id/loading"
android:layout_width="@dimen/jz_start_button_w_h_normal"
android:layout_height="@dimen/jz_start_button_w_h_normal"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:indeterminateDrawable="@drawable/jz_loading"
android:visibility="invisible" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<LinearLayout
android:id="@+id/start_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_gravity="center_vertical">
<ImageView
android:id="@+id/start"
android:layout_width="@dimen/jz_start_button_w_h_normal"
android:layout_height="@dimen/jz_start_button_w_h_normal"
android:src="@drawable/jz_click_play_selector" />
</LinearLayout>
<TextView
android:id="@+id/replay_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/start_layout"
android:layout_centerHorizontal="true"
android:layout_marginTop="6dp"
android:text="@string/replay"
android:textColor="#ffffff"
android:textSize="12sp"
android:visibility="invisible" />
<LinearLayout
android:id="@+id/retry_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/video_loading_faild"
android:textColor="@android:color/white"
android:textSize="14sp" />
<TextView
android:id="@+id/retry_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:background="@drawable/retry_bg"
android:paddingBottom="4dp"
android:paddingLeft="9dp"
android:paddingRight="9dp"
android:paddingTop="4dp"
android:text="@string/click_to_restart"
android:textColor="@android:color/white"
android:textSize="14sp" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:id="@+id/rl_touch_help"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:alpha="0"
android:background="@color/cf0f2f7"></RelativeLayout>
<LinearLayout
android:id="@+id/ll_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:padding="15dp"
android:visibility="gone">
<ImageView
android:id="@+id/iv_start"
android:layout_width="16dp"
android:layout_height="18dp"
android:background="@mipmap/stop" />
</LinearLayout>
</RelativeLayout>
还需要实现循环播放，这个比较简单，重写onAutoCompletion方法，当其播放完成时，继续播放即可。
@Override
public void onAutoCompletion() {
thumbImageView.setVisibility(View.GONE);
if (currentScreen == SCREEN_WINDOW_FULLSCREEN) {
onStateAutoComplete();
setUp((String) getCurrentUrl(), JZVideoPlayer.SCREEN_WINDOW_FULLSCREEN);
} else {
super.onAutoCompletion();
setUp((String) getCurrentUrl(), JZVideoPlayer.CURRENT_STATE_NORMAL);
}
//循环播放
startVideo();
}
到这里，列表播放这个功能已经完成了。
最后，献上完整代码。
Github