ImageAdapter不能应用于Fragment类 [英] ImageAdapter cannot be applied to a Fragment Class
问题描述
我正在尝试遵循ImageView和GalleryView教程,并在fragment类中添加galleryview,但是存在一个错误,即ImageAdapter无法应用于Tab1Fragment类,并且我不知道如何解决它.
I am trying to follow ImageView and GalleryView tutorial and add a galleryview in a fragment class however there is an error that the ImageAdapter cannot be applied to the Tab1Fragment class, and I cannot figure out how to solve it.
片段类
package eu.lucazanini;
import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;
import eu.lucazanini.DialogHelper;
public class Tab2Fragment extends Fragment{
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab2, container, false);
GridView gridview = (GridView) gridview.findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this);
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Toast.makeText(getActivity(), "" + position,
Toast.LENGTH_SHORT).show();
}
});
}
}
ImageAdapter类-此类中仅在Fragment类中未显示错误
ImageAdapter Class - No errors shown within this class, only within the Fragment Class
package eu.lucazanini;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some
// attributes
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.setImageResource(mThumbIds[position]);
return imageView;
}
// references to our images
private Integer[] mThumbIds = { R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7, R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7, R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7 };
}
推荐答案
首先,您应该移动返回行 return inflater.inflate(R.layout.tab2,container,false);
到onCreateView的末尾,因为所有其他行都将无法访问.
First of all, you should move the return line return inflater.inflate(R.layout.tab2, container, false);
to end of your onCreateView, because all other lines will be unreachable.
此外,您还应通过以下方式更正onCreateView:
View view = inflater.inflate(R.layout.tab2, container, false);
GridView gridview = (GridView) view.findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(getActivity());
.
.
.
return view ;
您应该向其传递上下文.您可以使用 getActivity()
.另外,您缺少右括号.因此,将错误的行替换为
You should pass a context to it. You can use the getActivity()
. Also you are missing a closing parenthesis. So, replace the wrong line with
new ImageAdapter(getActivity()) ;
这篇关于ImageAdapter不能应用于Fragment类的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!