將位圖設置爲列表視圖項的特定圖像視圖

Question

我試圖設置一個圖像從圖庫意圖到ImageView行ListView行，被點擊。新行會與附加Menu按鈕進行添加（我row.xml有ImageView和TextView） 這裏是我的代碼：

public class MyActivity extends ListActivity { 

    private ListView lv; 
    private ArrayList<String> itemArray; 
    private ArrayAdapter<String> itemAdapter; 

    //new gallery intent privates 
    private static final int SELECT_PICTURE = 1; 
    private String selectedImagePath; 

    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 

     itemArray = new ArrayList<String>(); 
     itemArray.clear(); 

     itemAdapter = new ArrayAdapter<String>(this, R.layout.row, R.id.label, itemArray); 
     setListAdapter(itemAdapter); 

    } 

    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (resultCode == RESULT_OK) { 
      if (requestCode == SELECT_PICTURE) { 
       Uri selectedImageUri = data.getData(); 
       selectedImagePath = getPath(selectedImageUri); 
       Toast.makeText(this, selectedImagePath, Toast.LENGTH_SHORT).show(); 

       Bundle extras = data.getExtras(); 
       if (extras != null) { 

        ImageView mImg = (ImageView) findViewById(R.id.icon); 
        mImg.setImageBitmap(BitmapFactory.decodeFile(selectedImagePath)); 
       } 

      } 
     } 
    } 

    public String getPath(Uri uri) { 
     if(uri == null) { 
      return null; 
     } 
     String[] projection = { MediaStore.Images.Media.DATA }; 
     Cursor cursor = managedQuery(uri, projection, null, null, null); 
     if(cursor != null){ 
      int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
      cursor.moveToFirst(); 
      return cursor.getString(column_index); 
     } 
     return uri.getPath(); 
    } 

    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     String item = (String) getListAdapter().getItem(position); 
     Toast.makeText(this, item + " selected", Toast.LENGTH_LONG).show(); 

     // select a file 
     Intent intent = new Intent(); 
     intent.setType("image/*"); 
     intent.setAction(Intent.ACTION_GET_CONTENT); 
     startActivityForResult(Intent.createChooser(intent, "Select Picture"), SELECT_PICTURE); 
    } 

    protected void addItemList() { 
     // TODO Auto-generated method stub 
     itemArray.add(0,"step"); 
     itemAdapter.notifyDataSetChanged(); 
    } 


    // menu options 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // TODO Auto-generated method stub 
     menu.add("add"); 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // TODO Auto-generated method stub 
     addItemList(); 
     Toast.makeText(this, "test", Toast.LENGTH_SHORT).show(); 
     return super.onOptionsItemSelected(item); 
    } 

} 

我如何才能將uniq的行ImageView到onActivityResult？什麼是最好的方式來做到這一點？

Answer 1

您可以將點擊的視圖分配給另一個變量。當您從活動返回時，您會在該變量中找到最後指定的圖像視圖。

ImageView lastClickedRowImage; 

... 

@Override 
protected void onListItemClick(ListView l, View v, int position, long id) { 

    // find the image view from clicked row and assign to lastClickedRowImage 
    // ex: v.findViewById(R.id.image_to_change) 
    lastClickedRowImage = v.findViewById(R.id.image_to_change); 
    ... 
} 

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // if conditions... 
    lastClickedRowImage.setImageBitmap(BitmapFactory.decodeFile(selectedImagePath)); 
} 

這應該有效。但在設置其位圖之前，還要檢查圖像視圖是否爲空。