选中的 Gridview 位置在滚动时发生变化

Question

我已经尝试过这个网站上的建议，但它们对我不起作用。我会尽量做到非常精确。我有一个自定义画廊，它在 gridview 中显示图像。用户可以从 gridview 中选择多个图像。单击 Gridview 位置后，该位置上会显示“勾号”图标，以通知用户该图像已被选中。问题是当我选择一个图像并滚动所选图像上的“勾选”图标出现在其他图像上时。这是代码。

    public class CustomPhotoGalleryActivity extends Activity {

private GridView grdImages;
private Button btnSelect;

private ImageAdapter imageAdapter;
private String[] arrPath;
private boolean[] thumbnailsselection;
private int ids[];
private int count;
private Cursor imagecursor = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.custom_gallery);
    grdImages = (GridView) findViewById(R.id.grdImages);
    btnSelect = (Button) findViewById(R.id.btnSelect);
    final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID};
    final String orderBy = MediaStore.Images.Media._ID;
    imagecursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy);
    int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
    this.count = imagecursor.getCount();
    this.arrPath = new String[this.count];
    ids = new int[count];
    this.thumbnailsselection = new boolean[this.count];
    for (int i = 0; i < this.count; i++) {
        imagecursor.moveToPosition(i);
        ids[i] = imagecursor.getInt(image_column_index);
        int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
        arrPath[i] = imagecursor.getString(dataColumnIndex);

        Log.e("arrPath", "" + arrPath[i]);
    }
    imageAdapter = new ImageAdapter(arrPath);
    grdImages.setAdapter(imageAdapter);

    btnSelect.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            final int len = thumbnailsselection.length;
            int cnt = 0;
            String selectImages = "";
            for (int i = 0; i < len; i++) {
                if (thumbnailsselection[i]) {
                    cnt++;
                    selectImages = selectImages + arrPath[i] + "|";
                }
            }
            if (cnt == 0) {
                Toast.makeText(getApplicationContext(), "Please select at least one image", Toast.LENGTH_LONG).show();
            } else {

                Log.d("SelectedImages", selectImages);
                Intent i = new Intent();
                i.putExtra("data", selectImages);
                setResult(Activity.RESULT_OK, i);
                finish();
            }
        }
    });
}
public class ImageAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private String[] arrPath;

    public ImageAdapter(String[] arrPath) {
        this.arrPath = arrPath;
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getViewTypeCount() {
        return arrPath.length;
    }


    public int getCount() {
        return count;
    }

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

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

    public View getView(final int position, View convertView, ViewGroup parent) {
        View rootView = convertView;
        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            rootView = mInflater.inflate(R.layout.custom_gallery_item, null);
            holder.imgThumb = (ImageView) rootView.findViewById(R.id.imgThumb);
            holder.chkImage = (ImageView) rootView.findViewById(R.id.chkImage);
            rootView.setTag(holder);
        } else {
            holder = (ViewHolder) rootView.getTag();

        }
        holder.chkImage.setId(position);
        holder.imgThumb.setId(position);
        holder.imgThumb.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                int id = holder.chkImage.getId()
                if (thumbnailsselection[id]) {
                    holder.chkImage.setVisibility(View.GONE);
                    thumbnailsselection[id] = false;
                } else {
                    holder.chkImage.setVisibility(View.VISIBLE);
                    thumbnailsselection[id] = true;
                }
            }
        });
        Picasso.with(CustomPhotoGalleryActivity.this)
                .load(new File(arrPath[position]))
                .resize(150, 150)
                .centerCrop()
                .into(holder.imgThumb);
        return rootView;
    }
}

class ViewHolder {
    ImageView imgThumb;
    ImageView chkImage;
    int id;
}
}

Answer 1

这样做对我有用，

public class CustomPhotoGalleryActivity extends Activity {

private GridView grdImages;
private Button btnSelect;

private ImageAdapter imageAdapter;
private String[] arrPath;
private boolean[] thumbnailsselection;
private int ids[];
private int count;
private Cursor imagecursor = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.custom_gallery);
    grdImages = (GridView) findViewById(R.id.grdImages);
    btnSelect = (Button) findViewById(R.id.btnSelect);
    final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID};
    final String orderBy = MediaStore.Images.Media._ID;
    imagecursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy);
    int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
    this.count = imagecursor.getCount();
    this.arrPath = new String[this.count];
    ids = new int[count];
    this.thumbnailsselection = new boolean[this.count];
    ArrayList<Items> list=new ArrayList<>();
    for (int i = 0; i < this.count; i++) {
        imagecursor.moveToPosition(i);
        ids[i] = imagecursor.getInt(image_column_index);
        int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
       // arrPath[i] = imagecursor.getString(dataColumnIndex);
       Items items=new Items();
       items.setChkImage(youResourceId);
       items.setThumbImageUrl(imagecursor.getString(dataColumnIndex));
       items.setIsImageSelected(false);
       list.add(items);

        Log.e("arrPath", "" + arrPath[i]);
    }
    imageAdapter = new ImageAdapter(list);
    grdImages.setAdapter(imageAdapter);

    btnSelect.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            final int len = thumbnailsselection.length;
            int cnt = 0;
            String selectImages = "";
            for (int i = 0; i < len; i++) {
                if (thumbnailsselection[i]) {
                    cnt++;
                    selectImages = selectImages + arrPath[i] + "|";
                }
            }
            if (cnt == 0) {
                Toast.makeText(getApplicationContext(), "Please select at least one image", Toast.LENGTH_LONG).show();
            } else {

                Log.d("SelectedImages", selectImages);
                Intent i = new Intent();
                i.putExtra("data", selectImages);
                setResult(Activity.RESULT_OK, i);
                finish();
            }
        }
    });
}
public class ImageAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private String[] arrPath;
    private ArrayList<Items> list;

    public ImageAdapter(ArrayList<Items> list) {
        this.arrPath = arrPath;
        this.list=list;
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getViewTypeCount() {
        return arrPath.length;
    }


    public int getCount() {
        return list.size();
    }

    public Items getItem(int position) {
        return list.get(position);
    }

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

    public View getView(final int position, View convertView, ViewGroup parent) {

        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView= mInflater.inflate(R.layout.custom_gallery_item, null);
            holder.imgThumb = (ImageView) convertView.findViewById(R.id.imgThumb);
            holder.chkImage = (ImageView) convertView.findViewById(R.id.chkImage);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();

        }

        if(list.get(postion).isImageSelected()){
           holder.chkImage.setVisibility(View.VISIBLE);
      }else{
           holder.chkImage.setVisibility(View.GONE);
         }         

        holder.imgThumb.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                int id = holder.chkImage.getId()
                if (list.get(postion).isImageSelected()) {
                    holder.chkImage.setVisibility(View.GONE);
                    list.get(postion).setIsImageSelected(false);
                } else {
                    holder.chkImage.setVisibility(View.VISIBLE);
                    list.get(postion).setIsImageSelected(true);
                }
                notifyDataSetChanged();
            }
        });
        Picasso.with(CustomPhotoGalleryActivity.this)
                .load(list.get(position).getThumbImageUrl())
                .resize(150, 150)
                .centerCrop()
                .into(holder.imgThumb);
        return convertView;
    }
}

class ViewHolder {
    ImageView imgThumb;
    ImageView chkImage;
    int id;
}
}

public class Items {


    int chkImage;
    String thumbImageUrl;
    boolean isImageSelected;


    public int getChkImage() {
        return chkImage;
    }

    public void setChkImage(int chkImage) {
        this.chkImage = chkImage;
    }

    public String getThumbImageUrl() {
        return thumbImageUrl;
    }

    public void setThumbImageUrl(String thumbImageUrl) {
        this.thumbImageUrl = thumbImageUrl;
    }

    public boolean isImageSelected() {
        return isImageSelected;
    }

    public void setIsImageSelected(boolean isImageSelected) {
        this.isImageSelected = isImageSelected;
    }
}