如何设置图像资源？

Question

我想在picture.setImageResource( ); 处将 ImageView 从 String 获取到 Int 我使用 String 到 Integer 更改，它没有显示在 GridView 中。如何获取图像大小和 setImageView？

菜单.java

public class Menu {

private Integer id;
private String menuImage;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getMenuImage() {
        return menuImage;
    }

    public void setMenuImage(String menuImage) {
        this.menuImage = menuImage;
    }

MyAdapter.java

public class MyAdapter extends BaseAdapter {
    List<Menu> mItems = new ArrayList<Item>(); // from server
    LayoutInflater mInflater;

    public MenuGridViewAdapter(Context context, List<Menu> menuList) {
        mInflater = LayoutInflater.from(context);
        this.menuList = menuList;
    }

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

    @Override
    public Menu getItem(int i) {
        return mItems.get(i);
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v = view;
        ImageView picture;
        TextView name;

        if (v == null) {
            v = mInflater.inflate(R.layout.grid_item, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
        }

        picture = (ImageView) v.getTag(R.id.picture);

        Item item = getItem(i);    
        picture.setImageResource( ); // 

        return v;
    }

Answer 1

imageView.setImageResource() 需要一个来自 Drawable 的图像，这是一个 int，例如：R.drawable.sample 您可以使用 picasso 库而不是 setImageResource。为此，

添加以下行以将添加图像加载到图像视图中。

Picasso.with(context).load(R.drawable.drawableName).into(picture);

将此添加到您的 build.gradle 文件中：

compile 'com.squareup.picasso:picasso:2.5.2' 

Answer 2

这将帮助您获取要在 setImageResource() 中使用的相应图像的 id

int id = getResources().getIdentifier("drawable/your_image", "id", "your_package_name");
    imageView.setImageResource(id);

至于高度和宽度，您可以设置这样的参数

LinearLayout linearLayout = (LinearLayout) v.findViewById(R.id.imgLayout2);
    LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(340, 340);
    parms.gravity = Gravity.CENTER;
    parms.setMargins(20, 50, 20, 50);
    final ImageView imageView = new ImageView(getActivity());
    imageView.setLayoutParams(parms);

Answer 3

使用此代码：

public class GridViewAdapter extends BaseAdapter {

    private Context mContext;

    public GridViewAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
       if (convertView == null) {
            // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

       imageView.setImageUri(Uri.parse("your url here")); // updated code
        return imageView;
    }

    // references to our images
    private Integer[] mThumbIds = {
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
            R.mipmap.ic_launcher, R.mipmap.ic_launcher,
    };

}