Android 在 Fragment 中带有 GridView 的适配器

Question

我用 GridView 适配器创建了音板，但我遇到了两个问题。

1. 它说

"CustomGridAdapter cannot be applied"

myGridView.setAdapter(new CustomGridAdapter(getActivity(), items));

2. 它说

"Cannot resolve method itemClicked(int)"

              ` @Override
                public void onClick(View v) {
                    context.itemClicked(position);
                }
            });`

这是我的 mFragment.java 文件：

package com.aaron.waller.girdlayoutmanagertest.mFragments;

import android.content.Context;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;

import com.aaron.waller.girdlayoutmanagertest.MainActivity;
import com.aaron.waller.girdlayoutmanagertest.R;

public class erstesFragment extends Fragment {

    GridView gridView;
    MediaPlayer mp;
    public String[] items ={"Button1","Button2","Button3","Button4","Button5","Button6"};

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView=inflater.inflate(R.layout.erstes_fragment,container,false);


        gridView= (GridView)rootView.findViewById(R.id.gridView1);
        gridView.setAdapter(new CustomGridAdapter(getActivity(), items));

        return rootView;
    }
    public void itemClicked(int position) {

        if(position == 0){
            mp = MediaPlayer.create(getActivity(), R.raw.sound1);
            mp.start();
        }else if(position == 1){
            mp = MediaPlayer.create(getActivity(), R.raw.sound2);
            mp.start();

        }else if(position == 2) {
            mp = MediaPlayer.create(getActivity(), R.raw.sound3);
            mp.start();
        }
        else if(position == 3) {
            mp = MediaPlayer.create(getActivity(), R.raw.sound4);
            mp.start();
        }
        else if(position == 4) {
            mp = MediaPlayer.create(getActivity(), R.raw.sound5);
            mp.start();
        }
        else if(position == 5) {
            mp = MediaPlayer.create(getActivity(), R.raw.sound6);
            mp.start();
        }

    }

    public class CustomGridAdapter extends BaseAdapter {

        private MainActivity context;
        private String[] items;
        LayoutInflater inflater;

        public CustomGridAdapter(MainActivity context, String[] items) {
            this.context = context;
            this.items = items;
            inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }


        @Override
        public int getCount() {
            return items.length;
        }

        @Override
        public Object getItem(int position) {
            return items[position];
        }

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

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

            if (convertView == null) {
                convertView = inflater.inflate(R.layout.single_item, null);
            }
            Button button = (Button) convertView.findViewById(R.id.button);
            button.setText(items[position]);
            button.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    context.itemClicked(position);
                }
            });

            return convertView;
        }

    }
}

我该如何解决这两个问题？

Answer 1

1) 替换为：

gridView.setAdapter(new CustomGridAdapter(getActivity(), items));

与：

gridView.setAdapter(new CustomGridAdapter(this, items));

2) 在CustomAdapter中修改如下：

    private Context context;
    private String[] items;
    LayoutInflater inflater;

    public CustomGridAdapter(Context context, String[] items) {
        this.context = context;
        this.items = items;
        inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

希望对您有所帮助。

Answer 2

试试这个：

 gridView.setAdapter(new CustomGridAdapter(getActivity(), items));

在 CustomGridAdapter class

public class CustomGridAdapter extends BaseAdapter{

    private Context context;
    private String[] items;
    LayoutInflater inflater;

    public CustomGridAdapter(Context c, String[] items) {
        this.context = c;
        this.items = items;
        inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

点击监听器现在使用：

button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if(context instanceof MainActivity) {
                    ((MainActivity) context).itemClicked(position);
                }
            }
        });