Question

我有一个自定义的gridview适配器CoursesAdapter，该适配器正在与cardview一起使用，但是由于某些原因，从arraylist设置时，图像视图src无法正常工作。但是，当我直接将图像ID分配给imageView时，它就会起作用。

感谢您的帮助。

自定义GridView适配器

    public class coursesAdapter extends BaseAdapter {

        private Context context;
        private ArrayList<Course> courseArrayList;

        //constructor

        public coursesAdapter(Context context, ArrayList<Course> courseArrayList) {
            this.context = context;
            this.courseArrayList = courseArrayList;
        }

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

        @Override
        public Course getItem(int position) {
            return courseArrayList.get(position);
        }

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            final Course course=courseArrayList.get(position);
            LayoutInflater layoutInflater=LayoutInflater.from(context);
            convertView=layoutInflater.inflate(R.layout.course_cardview,parent,false);
            final ImageView courseImage=(ImageView) convertView.findViewById(R.id.course_image_imageView);

            final TextView courseTitle = convertView.findViewById(R.id.course_title_textView);
   //Here if I use courseImage.setImageResource(R.drawable.sample_thumbnail); 
//image is shown            
      courseImage.setImageResource(courseArrayList.get(position).getImage());
            courseTitle.setText(courseArrayList.get(position).getName());

            return convertView;`enter code here`
        }
    }

由于此适配器用于测试，因此我用相同的值填充了数组列表。

适配器的阵列列表

for(int i=0;i<10;i++)
        courseArrayList.add(new Course("Maths","Arslan",R.drawable.sample_thumbnail));

课程等级

public class Course implements Parcelable{
    private String name; // course Name
    private String lecturer; // course lecturer
    private int image; //course Image

    //constructors

    public Course(String name, String lecturer, int image) {
        this.name = name;
        this.lecturer = lecturer;
        this.image = image;
    }

    //Getters and Setters


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLecturer() {
        return lecturer;
    }

    public void setLecturer(String lecturer) {
        this.lecturer = lecturer;
    }

    public int getImage() {
        return image;
    }

    public void setImage(int image) {
        this.image = image;
    }

    // Parcelable Overridden functions

    protected Course(Parcel in) {
        name = in.readString();
        lecturer = in.readString();
        image = in.readInt();
    }

    public static final Creator<Course> CREATOR = new Creator<Course>() {
        @Override
        public Course createFromParcel(Parcel in) {
            return new Course(in);
        }

        @Override
        public Course[] newArray(int size) {
            return new Course[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeString(lecturer);
        dest.writeInt(image);
    }
}

Answer 1

更改此行：

courseImage.setImageResource(courseArrayList.get(position).getImage());

收件人：

courseImage.setImageResource(ContextCompat.getDrawable(context,courseArrayList.get(position).getImage()));

Answer 2

尝试这种方式

添加此库

implementation 'com.squareup.picasso:picasso:2.71828'

并将其添加到您的适配器中

Picasso.get().load(courseArrayList.get(position).getImage()).into(imageView1);

让我知道是否可行

Answer 3

添加此库

implementation 'com.github.bumptech.glide:glide:3.8.0'

以及您用于查看图片的代码

Glide.with(context).load(courseArrsylist.get(position).getImage())
            .override(100, 100)// here your can use the size of image
            .into(courseImage);

Image View src在自定义网格视图适配器中不起作用

3 个答案: