我不知道如何獲得IMG的位置，我點擊，所以我可以傳遞給下一個活性

Question

我的網格視圖工作正常，並顯示圖像從Sdcard.When我長按圖像上下文任務框打開。其中一個選項是View（全屏查看）。我不知道如何獲取所選圖像的ID或位置，以便我可以將它傳遞給另一個將以全屏方式打開它的活動。

公共類MainActivity延伸活動{

public class ImageAdapter extends BaseAdapter { 

    private Context mContext; 
    ArrayList<String> itemList = new ArrayList<String>(); 

    public ImageAdapter(Context c) { 
     mContext = c; 
    } 

    void add(String path){ 
     itemList.add(path); 
    } 

    @Override 
    public int getCount() { 
     return itemList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return itemList.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { // if it's not recycled, initialize some attributes 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(165, 165)); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      //imageView.setPadding(8, 8, 8, 8); 
     } else { 
      imageView = (ImageView) convertView; 
     } 

     Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 250, 250); 

     imageView.setImageBitmap(bm); 
     return imageView; 
    } 

    public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) { 

     Bitmap bm = null; 
     // First decode with inJustDecodeBounds=true to check dimensions 
     final BitmapFactory.Options options = new BitmapFactory.Options(); 
     options.inJustDecodeBounds = true; 
     BitmapFactory.decodeFile(path, options); 

     // Calculate inSampleSize 
     options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 

     // Decode bitmap with inSampleSize set 
     options.inJustDecodeBounds = false; 
     bm = BitmapFactory.decodeFile(path, options); 

     return bm;  
    } 

    public int calculateInSampleSize(

     BitmapFactory.Options options, int reqWidth, int reqHeight) { 
     // Raw height and width of image 
     final int height = options.outHeight; 
     final int width = options.outWidth; 
     int inSampleSize = 1; 

     if (height > reqHeight || width > reqWidth) { 
      if (width > height) { 
       inSampleSize = Math.round((float)height/(float)reqHeight);  
      } else { 
       inSampleSize = Math.round((float)width/(float)reqWidth);  
      } 
     } 

     return inSampleSize;  
    } 

} 

ImageAdapter myImageAdapter; 

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

    GridView gridview = (GridView) findViewById(R.id.gridview); 
    myImageAdapter = new ImageAdapter(this); 
    gridview.setAdapter(myImageAdapter); 

    String ExternalStorageDirectoryPath = Environment 
      .getExternalStorageDirectory() 
      .getAbsolutePath(); 

    String targetPath = ExternalStorageDirectoryPath ; 

    Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show(); 
    File targetDirector = new File(targetPath); 

    File[] files = targetDirector.listFiles(); 
    for (File file : files){ 
     myImageAdapter.add(file.getAbsolutePath()); 
    } 

    registerForContextMenu(gridview); 
} 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) { 
    super.onCreateContextMenu(menu, v, menuInfo); 
     menu.setHeaderTitle("Context Menu"); 
     menu.add(0, v.getId(), 0, "View"); 
     menu.add(0, v.getId(), 0, "Details"); 
     menu.add(0, v.getId(), 0, "Delete"); 

    } 

    @Override 
    public boolean onContextItemSelected(MenuItem item) { 
     if(item.getTitle()=="View"){function1(item.getItemId());} 
     else if(item.getTitle()=="Details"){function2(item.getItemId());} 
     else if(item.getTitle()=="Delete"){function3(item.getItemId());} 
     else {return false;} 
    return true; 
    } 

    public void function1(int id){ 
     // Sending image id to FullScreenActivity 
     Intent i = new Intent(getApplicationContext(), FullImageActivity.class); 

     // Here is the problem i want to get the position or id of the clicked strong textimage and pass it to the other activity so i can view it full screen 

     i.putExtra("id", position); 
     startActivity(i); 
     Toast.makeText(this, "function 1 called", Toast.LENGTH_SHORT).show(); 
    } 

}`

Answer 1

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

GridView gridview = (GridView) findViewById(R.id.gridview); 

myImageAdapter = new ImageAdapter(this); 
gridview.setAdapter(myImageAdapter); 
gridView.setOnItemClickListener(new OnItemClickListener() { 

    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, 
    long id) { 
    System.out.println("position"+position); 
    } 
} 
}); 

String ExternalStorageDirectoryPath = Environment 
     .getExternalStorageDirectory() 
     .getAbsolutePath(); 

String targetPath = ExternalStorageDirectoryPath ; 

Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show(); 
File targetDirector = new File(targetPath); 

File[] files = targetDirector.listFiles(); 
for (File file : files){ 
    myImageAdapter.add(file.getAbsolutePath()); 
} 

registerForContextMenu(gridview); 
}