安卓 tv 首页四个图片缩略图，通过遥控器选择，选中后点击遥控器上 ok 键，实现图片全屏显示并轮播

要实现安卓TV首页四个图片缩略图，通过遥控器选择，选中后点击遥控器上ok键，实现图片全屏显示并轮播，可以参考以下步骤：

1. 在布局文件中添加一个GridView控件，用于显示四个图片缩略图。

<GridView
    android:id="@+id/grid_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="2"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:padding="10dp"
    android:gravity="center"
    android:stretchMode="columnWidth" />

2. 在Activity中设置GridView的适配器，加载图片缩略图。

gridView.setAdapter(new ImageAdapter(this, imageIds));

3. 在适配器中实现缩略图的加载和点击事件的处理。

public class ImageAdapter extends BaseAdapter {
    private Context context;
    private int[] imageIds;

    public ImageAdapter(Context context, int[] imageIds) {
        this.context = context;
        this.imageIds = imageIds;
    }

    @Override
    public int getCount() {
        return imageIds.length;
    }

    @Override
    public Object getItem(int position) {
        return imageIds[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {
            imageView = new ImageView(context);
            imageView.setLayoutParams(new GridView.LayoutParams(500, 500));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageResource(imageIds[position]);
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 点击图片缩略图后，跳转到全屏显示页面
                Intent intent = new Intent(context, FullscreenActivity.class);
                intent.putExtra("imageIds", imageIds);
                intent.putExtra("position", position);
                context.startActivity(intent);
            }
        });
        return imageView;
    }
}

4. 在全屏显示页面中，使用ViewPager控件实现图片轮播效果，并处理遥控器的OK键点击事件。

public class FullscreenActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private int[] imageIds;
    private int position;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fullscreen);

        viewPager = findViewById(R.id.view_pager);
        imageIds = getIntent().getIntArrayExtra("imageIds");
        position = getIntent().getIntExtra("position", 0);

        viewPager.setAdapter(new ImagePagerAdapter());
        viewPager.setCurrentItem(position);

        // 处理遥控器的OK键点击事件
        viewPager.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) {
                    // 按下OK键后，跳转到下一张图片
                    int nextItem = viewPager.getCurrentItem() + 1;
                    if (nextItem >= imageIds.length) {
                        nextItem = 0;
                    }
                    viewPager.setCurrentItem(nextItem, true);
                    return true;
                }
                return false;
            }
        });
    }

    private class ImagePagerAdapter extends PagerAdapter {
        @Override
        public int getCount() {
            return imageIds.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView imageView = new ImageView(container.getContext());
            imageView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setImageResource(imageIds[position]);
            container.addView(imageView);
            return imageView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((ImageView) object);
        }
    }
}

以上就是实现安卓TV首页四个图片缩略图，通过遥控器选择，选中后点击遥控器上ok键，实现图片全屏显示并轮播的基本步骤。需要注意的是，遥控器的OK键对应的键值可能会因不同的遥控器型号而有所不同，需要根据实际情况进行调整。