安裝適配器和GridView中的片段

Question

我用GridView適配器創建了一個音板，但我遇到了兩個問題。

1. 它說

「CustomGridAdapter不能應用於」

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

它說

「無法解析方法itemClicked（INT）」

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

這裏是我的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; 
     } 

    } 
} 

我怎樣才能解決這個兩個問題？

Answer 1

1）替換此：

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

隨着：

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

2）在CustomAdapter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); 
    } 

希望這有助於。

Answer 2

試試這個：

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

在CustomGridAdapter類

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); 
    } 

現在的點擊監聽器使用：

button.setOnClickListener(new View.OnClickListener() { 

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