所述的PlaybackOverlayFragment示例应用程序使用PlaybackControlsGlue建立基于数据模型播放控件。这是使用标准胶水时的外观:
我的问题是我不希望标题/字幕文本出现在主播放器控制栏上方-我们希望它们显示在播放器屏幕的左上方。因此,要禁用标题/字幕的显示,我覆盖createControlsRowAndPresenter()
了粘合,而是使用PlaybackControlsRowPresenter的empty-args构造函数:
@Override
public PlaybackControlsRowPresenter createControlsRowAndPresenter() {
PlaybackControlsRow controlsRow = new PlaybackControlsRow(this);
setControlsRow(controlsRow);
final View.OnKeyListener onKeyListener = this;
PlaybackControlsRowPresenter presenter = new PlaybackControlsRowPresenter() { // no AbstractDetailsDescriptionPresenter argument
@Override
protected void onBindRowViewHolder(RowPresenter.ViewHolder vh, Object item) {
super.onBindRowViewHolder(vh, item);
vh.setOnKeyListener(onKeyListener);
}
@Override
protected void onUnbindRowViewHolder(RowPresenter.ViewHolder vh) {
super.onUnbindRowViewHolder(vh);
vh.setOnKeyListener(null);
}
};
// secondaryActionsAdapter setup not shown
presenter.setOnActionClickedListener(new OnActionClickedListener() {
@Override
public void onActionClicked(Action action) {
dispatchAction(action);
}
});
return presenter;
}
结果?没有标题/字幕显示,但是现在主控件栏和其他行之间的间距更大:
我可能在做错什么,还是leanback库存在错误?
原来,播放控件需要在其上方有一些视图,这样它们才不会占据容器视图的顶部(@Nick是正确的)。但是我想分享我的解决方案,以防任何人有类似的需求。
PlaybackControlsRowPresenter可以接受其构造函数中的任何演示者,而不仅仅是AbstractDetailsDescriptionPresenters。因此,createControlsRowAndPresenter()应该如下所示:
EmojiRowPresenter emojiRowPresenter = new EmojiRowPresenter() {
@Override
protected void onBindEmojiInfo(EmojiRowView rowView, EmojiInfo emojiInfo) {
rowView.setEmojiInfo(emojiInfo);
}
};
PlaybackControlsRowPresenter presenter = new PlaybackControlsRowPresenter(emojiRowPresenter) { // replace the default description presenter with custom presenter
...
}
// everything else stays as before
EmojiRowPresenter是Presenter的子类,如下所示:
public abstract class EmojiRowPresenter extends Presenter {
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent) {
EmojiRowView emojiRowView = new EmojiRowView(parent.getContext());
emojiRowView.setFocusable(true);
emojiRowView.setFocusableInTouchMode(true);
return new ViewHolder(emojiRowView);
}
@Override
public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
EmojiRowView emojiRowView = (EmojiRowView) viewHolder.view;
PlaybackControlHelper glue = (PlaybackControlHelper) item;
EmojiInfo emojiInfo = glue.getEmojiInfo();
if (emojiInfo != null) {
onBindEmojiInfo(emojiRowView, emojiInfo);
}
}
@Override
public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
// ...
}
protected abstract void onBindEmojiInfo(EmojiRowView rowView, EmojiInfo emojiInfo);
}
当然,EmojiRowView从定义每个项目的布局中创建视图。这是最终结果:
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