Question

为什么这一行：

g.setAdapter(new ImageAdapter(this));

给我错误“Constructor Undefined”？

我使用本指南制作标签http://www.androidbegin.com/tutorial/implementing-fragment-tabs-in-android/，现在我正在尝试在其中一个标签上实现网格视图，但ImageAdapter存在问题。如果我将鼠标移到错误上并根据它所说的内容更改代码，那么它只会开始更改“上下文”内容并产生更多错误。

以下是代码：

package com.example.tabexample;

import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class FragmentTab2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment2, container, false);


    GridView g = (GridView) rootView.findViewById(R.id.grid_view);
    g.setAdapter(new ImageAdapter(this));


    return rootView;

}
public class ImageAdapter extends BaseAdapter{
    private Context context;
    public Integer[] Skins = {R.drawable.s1, R.drawable.s2, R.drawable.s3,
            R.drawable.s4, R.drawable.s5, R.drawable.s6,
            R.drawable.s7, R.drawable.s8, R.drawable.s9,
            R.drawable.s10, R.drawable.s11, R.drawable.s12};

    public ImageAdapter(Context c) {
        // TODO Auto-generated constructor stub
        context = c;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ImageView pic = new ImageView(context);
        pic.setLayoutParams(new GridView.LayoutParams(200,200));
        pic.setScaleType(ImageView.ScaleType.FIT_CENTER);
        pic.setPadding(8, 8, 8, 8);
        pic.setImageResource(Skins[position]);
        return pic;
    }

}

}

Answer 1

用

替换该行

g.setAdapter(new ImageAdapter(getActivity()));

Fragment不会继承Context。

为什么我收到构造函数未定义错误？

1 个答案: