如何在Android上創建照片庫？

Question

我想在Android上創建照片庫。我使用Gallery和BaseAdapter來創建可滾動的圖庫。現在我想在顯示圖庫的圖像時添加一個動作（每個圖像的寬度與屏幕寬度相同），因此我需要在圖像數組中獲取其索引。我的問題是如何獲得在屏幕上顯示的圖像的索引？

我想在屏幕上顯示圖像的索引，而不是點擊事件。 我試圖得到getView()當前圖像的位置，但結果很奇怪：

我滾動到image02，但位置= 2（應該是1）。當我回滾時，image02的位置= 0（應該是1）。

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main);  

     Gallery g = (Gallery) this.findViewById(R.id.Gallery); 
     g.setAdapter(new ImageAdapter(this)); 
} 

public class ImageAdapter extends BaseAdapter { 

    private Context mContext; 
    private Integer[] mImageIds = { 
      //each image's size is 320x60 
      R.drawable.btm01, 
      R.drawable.btm02, 
      R.drawable.btm03 
    }; 
    public ImageAdapter(Context c){ 
     this.mContext = c; 
    } 
    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return mImageIds.length; 
    } 
    @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 imageView = new ImageView(mContext); 
     imageView.setImageResource(mImageIds[position]); 
     imageView.setLayoutParams(new Gallery.LayoutParams(320,60));  
     return imageView; 
    } 

Answer 1

檢查this例子。

// Reference the Gallery view 
Gallery g = (Gallery) this.findViewById(R.id.Gallery); 
// Set the adapter to our custom adapter (below) 
g.setAdapter(new ImageAdapter(this)); 

// Set a item click listener, and just Toast the clicked position 
g.setOnItemClickListener(new OnItemClickListener() { 
    public void onItemClick(AdapterView parent, View v, int position, long id) { 
    Toast.makeText(Gallery1.this, "" + position, Toast.LENGTH_SHORT).show(); 
    } 
});