想要将相片从图库添加到GridView (Android Studio)

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

// 导入所需的类
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private static final int PICK_IMAGE_REQUEST = 1;
    private ArrayList<Bitmap> imagesList;
    private GridView gridView;
    private ImageAdapter imageAdapter;

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

        gridView = findViewById(R.id.grid_view);
        imagesList = new ArrayList<>();
        imageAdapter = new ImageAdapter(this, imagesList);
        gridView.setAdapter(imageAdapter);

        // 设置GridView的点击事件，用于选择图片
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                openGallery();
            }
        });
    }

    // 打开图库选择图片
    private void openGallery() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
    }

    // 处理图库选择图片后的回调
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            Uri selectedImageUri = data.getData();
            try {
                // 将选择的图片转换为Bitmap并添加到列表中
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), selectedImageUri);
                imagesList.add(bitmap);
                imageAdapter.notifyDataSetChanged();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import java.util.ArrayList;

public class ImageAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<Bitmap> imagesList;

    public ImageAdapter(Context context, ArrayList<Bitmap> imagesList) {
        this.context = context;
        this.imagesList = imagesList;
    }

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

    @Override
    public Object getItem(int position) {
        return imagesList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
        }

        ImageView imageView = convertView.findViewById(R.id.image_view);
        imageView.setImageBitmap(imagesList.get(position));

        return convertView;
    }
}

<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/image_view"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:scaleType="centerCrop" />