Android TV 开发--＞Leanback 中 VerticalGridSupportFragment 的使用

Posted 2022-04-27 Kevin_小飞象

效果图

具体使用

0. 清单文件中添加

<uses-feature
        android:name="android.software.leanback"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.touchscreen"
        android:required="false" />

1. 添加依赖

implementation 'androidx.leanback:leanback:1.0.0'
implementation 'androidx.leanback:leanback-preference:1.0.0'

2. 布局文件
activity_test.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_frame"
    android:name="com.hkt.leanbackdemo.leanback.test.vertical.VerticalGridFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

3. VerticalGridFragment.java

public class VerticalGridFragment extends VerticalGridSupportFragment 
    private static final int COLUMNS = 4;
    private static final int ZOOM_FACTOR = FocusHighlight.ZOOM_FACTOR_MEDIUM;
    private ArrayObjectAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);

        setTitle(getString(R.string.browse_title));

        setupRowAdapter();
    

    private void setupRowAdapter() 
        VerticalGridPresenter gridPresenter = new VerticalGridPresenter(ZOOM_FACTOR);
        gridPresenter.setNumberOfColumns(COLUMNS);
        setGridPresenter(gridPresenter);

        PresenterSelector cardPresenterSelector = new CardPresenterSelector(getActivity());
        mAdapter = new ArrayObjectAdapter(cardPresenterSelector);
        setAdapter(mAdapter);

        prepareEntranceTransition();
        new Handler().postDelayed(new Runnable() 
            @Override
            public void run() 
                createRows();
                startEntranceTransition();
            
        , 1000);
    

    private void createRows() 
        String json = Utils.inputStreamToString(getResources()
                .openRawResource(R.raw.grid_example));
        CardRow row = new Gson().fromJson(json, CardRow.class);
        mAdapter.addAll(0, row.getCards());
    

4. CardPresenterSelector.java

public class CardPresenterSelector extends PresenterSelector 
    private final Context mContext;
    private final HashMap<Card.Type, Presenter> presenters = new HashMap<Card.Type, Presenter>();

    public CardPresenterSelector(Context context) 
        mContext = context;
    

    @Override
    public Presenter getPresenter(Object item) 
        if (!(item instanceof Card)) throw new RuntimeException(
                String.format("The PresenterSelector only supports data items of type '%s'",
                        Card.class.getName()));
        Card card = (Card) item;
        Presenter presenter = presenters.get(card.getType());
        if (presenter == null) 
            switch (card.getType()) 
                case SINGLE_LINE:
//                    presenter = new SingleLineCardPresenter(mContext);
                    break;
                case VIDEO_GRID:
//                    presenter = new VideoCardViewPresenter(mContext, R.style.VideoGridCardTheme);
                    break;
                case MOVIE:
                case MOVIE_BASE:
                case MOVIE_COMPLETE:
                case SQUARE_BIG:
                case GRID_SQUARE:
                case GAME: 
                    int themeResId = R.style.MovieCardSimpleTheme;
                    if (card.getType() == Card.Type.MOVIE_BASE) 
                        themeResId = R.style.MovieCardBasicTheme;
                     else if (card.getType() == Card.Type.MOVIE_COMPLETE) 
                        themeResId = R.style.MovieCardCompleteTheme;
                     else if (card.getType() == Card.Type.SQUARE_BIG) 
                        themeResId = R.style.SquareBigCardTheme;
                     else if (card.getType() == Card.Type.GRID_SQUARE) 
                        themeResId = R.style.GridCardTheme;
                     else if (card.getType() == Card.Type.GAME) 
                        themeResId = R.style.GameCardTheme;
                    
                    presenter = new ImageCardViewPresenter(mContext, themeResId);
                    break;
                
                case SIDE_INFO:
                    presenter = new SideInfoCardPresenter(mContext);
                    break;
                case TEXT:
//                    presenter = new TextCardPresenter(mContext);
                    break;
                case ICON:
//                    presenter = new IconCardPresenter(mContext);
                    break;
                case CHARACTER:
//                    presenter = new CharacterCardPresenter(mContext);
                    break;
                default:
                    presenter = new ImageCardViewPresenter(mContext);
                    break;
            
        
        presenters.put(card.getType(), presenter);
        return presenter;
    

6. 资源文件 raw/grid_example.json

  "cards": [
    
      "type": "GRID_SQUARE",
      "title": "Nüsse",
      "description": "$3.99/lb",
      "localImageResource": "food_01"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Undefinierbar",
      "description": "$3.99/lb",
      "localImageResource": "food_02"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Brocoli",
      "description": "$3.99/lb",
      "localImageResource": "food_03"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Salat",
      "description": "$3.99/lb",
      "localImageResource": "food_04"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Große Radischen",
      "description": "$3.99/lb",
      "localImageResource": "food_05"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Rote Zwiebeln",
      "description": "$3.99/lb",
      "localImageResource": "food_06"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Lauch",
      "description": "$3.99/lb",
      "localImageResource": "food_07"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Exotisches Zeugs",
      "description": "$3.99/lb",
      "localImageResource": "food_08"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Zitronen",
      "description": "$3.99/lb",
      "localImageResource": "food_09"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Meerirgendwas",
      "description": "$3.99/lb",
      "localImageResource": "food_10"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Irgendein Kohl",
      "description": "$3.99/lb",
      "localImageResource": "food_11"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Apfel",
      "description": "$3.99/lb",
      "localImageResource": "food_12"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Mehr Äpfel",
      "description": "$3.99/lb",
      "localImageResource": "food_13"
    ,
    
      "type": "GRID_SQUARE",
      "title": "Tomaten",
      "description": "$3.99/lb",
      "localImageResource": "food_14"
    
  ]

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