如何从List＆lt; setImageResource ＆GT; = new ArrayList＆lt;＆gt;（）

Question

我有一个GridViewActivity，GridViewAdapter，FullScreenActivity和FullScreenImageAdapter。当我从GridView中单击图像时，转到FullScreenActivity并且它不会显示任何内容。我也从Drawable imgDisplay.setImageResource(R.drawable.a);测试它没有发生。怎么了？我怎么解决？请！

在GridViewAdapter中;图像单击“侦听器”，

private class OnImageClickListener implements View.OnClickListener {
    int _postion;

    public OnImageClickListener(int position) {
        this._postion = position;
    }

    @Override
    public void onClick(View v) {
        Intent i = new Intent(_activity, FullScreenActivity.class);
        i.putExtra("position", _postion);
        _activity.startActivity(i);

    }
}

在FullScreenActivity中;从GridView获取位置，然后创建新的FullScreenImageAdapter

List<Item> mItems = new ArrayList<>();

int position = getIntent().getIntExtra("position", 0);
Log.i("Result", String.valueOf(position)); // return 0,1,2,3.. etc
adapter = new FullScreenImageAdapter(FullScreenActivity.this, mItems);
viewPager.setAdapter(adapter);

在FullScreenImageAdapter中;

public class FullScreenImageAdapter extends PagerAdapter {

    List<Item> mItems = new ArrayList<>();
    Activity _activity;
    LayoutInflater inflater;

    public FullScreenImageAdapter(Activity activity, List<Item> mItems) {
        this._activity = activity;
        this.mItems = mItems;
    }

    @Override
    public int getCount() {
        return mItems.size();
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        ImageView imgDisplay;
        inflater = (LayoutInflater) _activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image, container, false);
        imgDisplay = (ImageView) viewLayout.findViewById(R.id.imgDisplay);
        imgDisplay.setImageResource(R.drawable.a); // want to show from mItems List
        ((ViewPager) container).addView(viewLayout);
        return viewLayout;
    }

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