在Android中,Leanback库是专为电视和流媒体播放器设计的一套用户界面组件。要在Leanback中实现视频播放,你需要遵循以下步骤:
在你的项目的build.gradle文件中,添加以下依赖项:
dependencies {
implementation 'com.android.support:leanback-v17:28.0.0'
implementation 'com.android.support:leanback-v17-leanback-v17:28.0.0'
}
创建一个新的Java或Kotlin类,继承自Leanback的VideoFragment。在这个类中,你可以设置视频播放器的布局和资源。
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.leanback.app.VideoFragment;
import androidx.leanback.widget.VideoView;
public class VideoPlayerFragment extends VideoFragment {
@NonNull
@Override
public VideoView onCreateVideoView(@NonNull Context context) {
return (VideoView) super.onCreateVideoView(context);
}
}
创建一个新的Java或Kotlin类,继承自Leanback的FragmentAdapter。在这个类中,你可以设置视频列表和当前播放的视频项。
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.leanback.app.FragmentAdapter;
import androidx.leanback.widget.ArrayObjectAdapter;
import androidx.leanback.widget.ListRow;
import androidx.leanback.widget.ListRowPresenter;
public class VideoFragmentAdapter extends FragmentAdapter {
private ArrayObjectAdapter mAdapter;
public VideoFragmentAdapter(@NonNull Context context) {
super(context);
mAdapter = new ArrayObjectAdapter(new ListRowPresenter());
// 添加视频列表项到适配器
for (int i = 0; i < videoList.size(); i++) {
mAdapter.add(videoList.get(i));
}
}
@NonNull
@Override
public Fragment getItem(int position) {
return new VideoPlayerFragment();
}
@Override
public int getItemCount() {
return videoList.size();
}
public void setVideoList(List<VideoItem> videoList) {
this.videoList = videoList;
mAdapter.clear();
for (int i = 0; i < videoList.size(); i++) {
mAdapter.add(videoList.get(i));
}
notifyDataSetChanged();
}
}
创建一个新的Java或Kotlin类,表示视频列表项。这个类应该包含视频的标题、描述和封面等信息。
public class VideoItem {
private String title;
private String description;
private String imageUrl;
public VideoItem(String title, String description, String imageUrl) {
this.title = title;
this.description = description;
this.imageUrl = imageUrl;
}
// getter和setter方法
}
在你的Activity中,实例化VideoFragmentAdapter并将其设置为内容视图。
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.leanback.app.PlaybackFragment;
import androidx.leanback.app.VideoFragmentAdapter;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
VideoFragmentAdapter videoFragmentAdapter = new VideoFragmentAdapter(this);
PlaybackFragment playbackFragment = (PlaybackFragment) getSupportFragmentManager()
.findFragmentById(R.id.playback_fragment);
playbackFragment.setAdapter(videoFragmentAdapter);
}
}
在你的布局文件中,添加一个PlaybackFragment,它将用于显示视频播放器。
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.leanback.app.PlaybackFragment
android:id="@+id/playback_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
现在你已经成功实现了在Android Leanback中播放视频的功能。你可以根据需要自定义VideoFragment、VideoFragmentAdapter和VideoItem类,以满足你的需求。