機器人數組索引例外

Question

我有一個活動，包括imageview的和gridview.the規則當我點擊選擇上gridview的圖像，將通過imageview.then預覽，所述ImageView的可點擊和它將在對話框中顯示。問題是當我單擊imageview時，圖像與gridview.here中的選定圖像不匹配我的代碼。

public class GalleryActivity extends Activity { 

ImageView imgviewThumb, imgviewPreviewDialog; 
public int[] imageResto = { 
     R.drawable.img1, 
     R.drawable.img2, 
     R.drawable.img3, 
     R.drawable.img4, 
     R.drawable.img5, 
     R.drawable.img1, 
     R.drawable.img2, 
     R.drawable.img3, 
     R.drawable.img4 
}; 
int position ; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_gallery); 

    imgviewThumb = (ImageView)findViewById(R.id.imgview_preview); 
    imgviewThumb.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Dialog dialog = new Dialog(GalleryActivity.this); 
      dialog.setCancelable(true); 
      dialog.setContentView(R.layout.dialog_previewimage); 
      imgviewPreviewDialog = (ImageView) dialog.findViewById(R.id.imgview_preview_dialog); 
      imgviewPreviewDialog.setImageResource(imageResto[position]); 
      dialog.show(); 
     } 
    }); 

    GridView gView = (GridView) findViewById(R.id.grid_View); 

    //Instantiating ImageAdapter class 
    gView.setAdapter(new ImageAdapter(this)); 

    /*showing full image on clicking the thumbnail 
    * create a new class named FullImage.java 
    */ 
    gView.setOnItemClickListener(new OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, 
       long id) { 
      imgviewThumb.setImageResource(imageResto[position]); 
     } 
    }); 
} 

public class ImageAdapter extends BaseAdapter { 
    public ImageAdapter(Context c) { 
     mContext = c; 
    } 

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

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

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

    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(140, 140)); 
      imageView.setAdjustViewBounds(false); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
     } else { 
      imageView = (ImageView) convertView; 
     } 

     imageView.setImageResource(mThumbIds[position]); 

     return imageView; 
    } 

    private Context mContext; 

    // images in array 
    public Integer[] mThumbIds = { 
      R.drawable.thumb1_e, 
      R.drawable.thumb2, 
      R.drawable.thumb3, 
      R.drawable.thumb4, 
      R.drawable.thumb5, 
      R.drawable.thumb1, 
      R.drawable.thumb2, 
      R.drawable.thumb3, 
      R.drawable.thumb4 
    }; 
} 
} 

請糾正me.thanks提前。

Answer 1

嘗試改變：

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

要這樣：

public Object getItem(int position) { 
     return mThumbIds[position]; 
} 

Answer 2

我想你使用兩種不同的陣列，它可能不匹配，

public int[] imageResto = { 
     R.drawable.img1, 
     R.drawable.img2, 
     R.drawable.img3, 
     R.drawable.img4, 
     R.drawable.img5, 
     R.drawable.img1, 
     R.drawable.img2, 
     R.drawable.img3, 
     R.drawable.img4 
}; 

    // images in array 
    public Integer[] mThumbIds = { 
      R.drawable.thumb1_e, 
      R.drawable.thumb2, 
      R.drawable.thumb3, 
      R.drawable.thumb4, 
      R.drawable.thumb5, 
      R.drawable.thumb1, 
      R.drawable.thumb2, 
      R.drawable.thumb3, 
      R.drawable.thumb4 
    }; 

並提出有效的圖像陣列 位置在這裏得到的是對數組的長度爲0的所以它的寫位置到達這裏

gView.setOnItemClickListener(new OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, 
       long id) { 

      imgviewThumb.setImageResource(validImageArray[position]); 
     } 
    }); 

，或者你可以做這樣的改變getView

public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(140, 140)); 
      imageView.setAdjustViewBounds(false); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
     } else { 
      imageView = (ImageView) convertView; 
     } 

     imageView.setImageResource(imageResto[position]); 

     return imageView; 
    }