图像仅显示在网格视图的第一项中

Question

图像仅显示在gridview的第一项中。下面是我的GridImageActivity，我在其中从图库中拍摄图像或从相机中捕获图像。拍摄图像后，仅在gridview的第一项中设置图像。如何在gridview的不同项目中显示图像。任何帮助表示赞赏。预先感谢。

 public class GridImage extends AppCompatActivity {
        GridView gv_gridimg;
        private Context context = this;
        Activity  activity;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_grid_image);
            gv_gridimg = findViewById(R.id.gv_gridimg);
            GridImgAdapter gridImgAdapter = new GridImgAdapter(this);
            gv_gridimg.setAdapter(gridImgAdapter);

                gv_gridimg.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        // gridImgAdapter.notifyDataSetChanged();  //to clear all the data that is assigned
                        String[] galleryPermissions = {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};

                        if (EasyPermissions.hasPermissions(context, galleryPermissions)) {
                            pickImageFromGallery();
                        } else {
                            EasyPermissions.requestPermissions(activity, "Access for storage", 101, galleryPermissions);
                        }
                    }
                });
            }


        private void pickImageFromGallery() {
            final CharSequence[] options = {"Take photo", "Choose from gallery", "Cancel"};
            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setTitle("Choose your profile picture");
            builder.setItems(options, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int item) {
                    if (options[item].equals("Take photo")) {
                        Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        startActivityForResult(takePicture, 0);
                    } else if (options[item].equals("Choose from gallery")) {
                        Intent pickPhoto = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                        startActivityForResult(pickPhoto, 1);
                    } else if (options[item].equals("Cancel")) {
                        dialog.dismiss();
                    }
                }
            });
            builder.show();
        }
        @Override
        protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
            ImageView iv_gridimg = (ImageView) gv_gridimg.findViewById(R.id.iv_gridimg);

            if (resultCode != RESULT_CANCELED) {
                switch (requestCode) {
                    case 0:
                        if (resultCode == RESULT_OK && data != null) {
                            Bitmap selectedImage = (Bitmap) data.getExtras().get("data");
                             iv_gridimg.setImageBitmap(selectedImage);

                        }
                        break;
                    case 1:
                        if (resultCode == RESULT_OK && data != null) {
                            Uri selectedImage = data.getData();
                            String[] filePathColumn = new String[]{MediaStore.Images.Media.DATA};
                            if (selectedImage != null) {
                                Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                                if (cursor != null) {
                                    cursor.moveToFirst();
                                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                                    String picturesPath = cursor.getString(columnIndex);
                                    iv_gridimg.setImageBitmap(BitmapFactory.decodeFile(picturesPath));
                                    cursor.close();
                                }
                            }
                        }
                        break;
                }
            }
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

这是我的适配器类

public class GridImgAdapter extends BaseAdapter {
    private Context context;
    public GridImgAdapter(Context context) {
        this.context  = context;
    }

    @Override
    public int getCount() {
        return 4;
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View gv_gridimg;
        gv_gridimg = layoutInflater.inflate(R.layout.item_grid_img,null);
        ImageView iv_gridimg = (ImageView) gv_gridimg.findViewById(R.id.iv_gridimg);
        return gv_gridimg;
    }
}

这是我的主要xml文件

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Activity.GridImage">
    <GridView
        android:id="@+id/gv_gridimg"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"
        android:numColumns="2"/>
</RelativeLayout>

这是我的项目xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/iv_gridimg"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:padding="40dp"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:src="@drawable/ic_camera_black_24dp"/>
</RelativeLayout>