在 GridView 中设置图片 Uri

Question

我正在尝试使用其 uri 将您手机图库中的图像添加到 gridView 中。不幸的是，它什么也没做，我似乎找不到让它工作的方法。

我的适配器：

public class ImageGridAdapter extends BaseAdapter {


public Uri imageUri;


private Context mContext;

public ImageGridAdapter(Context c) {
    this.mContext = c;
}

@Override
public int getCount() {

    return 0;
}

@Override
public Object getItem(int position) {

    return null;
}

@Override
public long getItemId(int position) {

    return 0;
}


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

    imageUri = PictureGroupActivity.selectedImage;


    ImageView imageView;
    if (convertView == null) {
        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(null);
    imageView.setImageURI(imageUri);

    return imageView;
   }
}

适配器应该从 onActivtyResult 获取 imageUri：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    gridView = (GridView)findViewById(R.id.picture_group_gridView);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
        selectedImage = data.getData();
        String[] filePathColumn = {MediaStore.Images.Media.DATA};
        Toast.makeText(PictureGroupActivity.this, "selectedImage ma hodnotu: " + selectedImage, Toast.LENGTH_SHORT).show();


    }
}

我已经在 activity 中的 onCreate 中设置了 gridView：

GridView gridView = (GridView)findViewById(R.id.picture_group_gridView);
    gridView.setAdapter(new ImageGridAdapter(this));

    gridView.invalidateViews();

    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(PictureGroupActivity.this, "You clicked " + position, Toast.LENGTH_SHORT).show();
        }
    });

从图库中选择照片时，gridView 保持为空。你如何使它工作？我究竟做错了什么？提前谢谢你。

Answer 1

如果您总是 return 来自 getCount() 的 0，那么您的列表将始终为空。同样，您需要 return 来自 getItem() 的内容，以便您的视图知道哪些数据与哪个列表项相关联。您可能想要使用更具体的 Adapter 实现，例如 ArrayAdapter 可以为您处理其中的一些问题。

Answer 2

public class ImageGridAdapter extends BaseAdapter {


public Uri imageUri;


private Context mContext;

public ImageGridAdapter(Context c) {
    this.mContext = c;
}

@Override
public int getCount() {

    return 5;
}

@Override
public Object getItem(int position) {

    return null;
}

@Override
public long getItemId(int position) {

    return 0;
}


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

    imageUri = PictureGroupActivity.selectedImage;


    ImageView imageView;
    if (convertView == null) {
        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(null);
    imageView.setImageURI(imageUri);

    return imageView;
   }
}

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