ошибка реализации GridView на фрагменте

Question

я получаю ошибку getApplicationContext() и getSystemService ошибку, когда я пытался реализовать GridView на фрагменте на мой андроид приложения. Как это разрешить? Есть ли ошибка в моем исходном коде?

`

private GridView photoGrid; 
private int mPhotoSize, mPhotoSpacing; 
private ImageAdapter imageAdapter; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.fragment1, container, false); 


    // get the photo size and spacing 
    mPhotoSize = getResources().getDimensionPixelSize(R.dimen.photo_size); 
    mPhotoSpacing = getResources().getDimensionPixelSize(R.dimen.photo_spacing); 

    // initialize image adapter 
    imageAdapter = new ImageAdapter(); 

    photoGrid = (GridView) getView().findViewById(R.id.albumGrid); 
    photoGrid.setOnItemClickListener(this); 

    GridView gridview = (GridView) getView().findViewById (R.id.albumGrid); 
     gridview.setAdapter (new ImageAdapter()); 

     gridview.setOnItemClickListener(new OnItemClickListener() 
     { 
      public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
       // TODO Auto-generated method stub 

       Intent myIntent = null; 
       if(position == 0){ 
        myIntent = new Intent(v.getContext(), PregnancyStagesMainActivity.class); 
       } 
       if(position == 1){ 
        myIntent = new Intent(v.getContext(), ComplicationsMainActivity.class); 
       } 
       if(position == 2){ 
        myIntent = new Intent(v.getContext(), DietAndFitnessMainActivity.class); 
       } 
       if(position == 3){ 
        myIntent = new Intent(v.getContext(), MythsAndFactsMainActivity.class); 
       } 
       if(position == 4){ 
        myIntent = new Intent(v.getContext(), HelplinesMainActivity.class); 
       } 
       if(position == 5){ 
        myIntent = new Intent(v.getContext(), FaqsMainActivity.class); 
       } 
       startActivity(myIntent); 
      } 
     }); 


    // set image adapter to the GridView 
    photoGrid.setAdapter(imageAdapter); 

    // Set the Required Animation to GridView and start the Animation 
    // use fly_in_from_center to have 2nd type of animation effect (snapshot 2) 
    Animation anim = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.in_from_left); 
    gridview.setAnimation(anim); 
    anim.start(); 

    // get the view tree observer of the grid and set the height and numcols dynamically 
    photoGrid.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { 
     @Override 
     public void onGlobalLayout() { 
      if (imageAdapter.getNumColumns() == 0) { 
       final int numColumns = (int) Math.floor(photoGrid.getWidth()/(mPhotoSize + mPhotoSpacing)); 
       if (numColumns > 0) { 
        final int columnWidth = (photoGrid.getWidth()/numColumns) - mPhotoSpacing; 
        imageAdapter.setNumColumns(numColumns); 
        imageAdapter.setItemHeight(columnWidth); 

       } 
      } 
     } 
    }); 
} 

// ///////// ImageAdapter class ///////////////// 
public class ImageAdapter extends BaseAdapter { 
    private LayoutInflater mInflater; 
    private int mItemHeight = 0; 
    private int mNumColumns = 0; 
    private RelativeLayout.LayoutParams mImageViewLayoutParams; 

    public ImageAdapter() { 
     mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     mImageViewLayoutParams = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, 
       LayoutParams.MATCH_PARENT); 
    } 

    public int getCount() { 
     return CONTENT.length; 
    } 

    // set numcols 
    public void setNumColumns(int numColumns) { 
     mNumColumns = numColumns; 
    } 

    public int getNumColumns() { 
     return mNumColumns; 
    } 

    // set photo item height 
    public void setItemHeight(int height) { 
     if (height == mItemHeight) { 
      return; 
     } 
     mItemHeight = height; 
     mImageViewLayoutParams = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, mItemHeight); 
     notifyDataSetChanged(); 
    } 

    public Object getItem(int position) { 
     return position; 
    } 

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

    public View getView(final int position, View view, ViewGroup parent) { 

     if (view == null) 
      view = mInflater.inflate(R.layout.photo_item, null); 

     ImageView cover = (ImageView) view.findViewById(R.id.cover); 
     TextView title = (TextView) view.findViewById(R.id.title); 

     cover.setLayoutParams(mImageViewLayoutParams); 

     // Check the height matches our calculated column width 
     if (cover.getLayoutParams().height != mItemHeight) { 
      cover.setLayoutParams(mImageViewLayoutParams); 
     } 

     cover.setImageResource(ICONS[position % ICONS.length]); 
     title.setText(CONTENT[position % CONTENT.length]); 

     return view; 
    } 
} 

@Override 
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
    // TODO Auto-generated method stub 

} 


} ` 

Answer 1

А Fragment не Context, поэтому ни один из этих вызовов не доступны в Fragment

Prefix эти вызовы с getActivity(), чтобы получить хост-активности (который является Context) , поэтому изменить их:

getActivity().getSystemService()

в d

getActivity().getApplicationContext()