Android - set imageView set

Question

我有一个应用程序，其中我有一个自定义的listView，在单击listView中的任何项目时，都会显示一个DialogFramgent。现在，我要做的是将DialogFramgent中的DialogFramgent设置为外部存储中的图像。我知道我可以将imageView的源设置为这样：

File imgFile = new  File(“/sdcard/Images/test_image.jpg”);
if(imgFile.exists()){

    Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

    ImageView myImage = (ImageView) findViewById(R.id.imageViewItem);
    myImage.setImageBitmap(myBitmap);

}

但是，我无法正确地初始化我的ImageView变量，因为findViewById给出了一个错误：‘findViewById(int)方法对于ItemDialog类型没有定义。

这里是我的自定义listView onClickLisenter中的一部分，在这里我调用了我的DialogFragment：

resultListView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> a, final View v, final int position, long id) {

        positionSelected = position;

        SearchResultListViewItem selectedRow = results.get(position);
        String selectedItem = selectedRow.getItemName();
        itemBarcode = selectedRow.getBarcode();

        itemListDB.open();

        ItemDialog itemDialog = new ItemDialog();

        itemDialog.itemName = selectedItem;
        itemDialog.brandName = itemListDB.getBrandFromItemBarcode(itemBarcode);
        itemDialog.UOMName = itemListDB.getUOMFromItemBarcode(itemBarcode);
        itemDialog.priceName = itemListDB.getPriceFromItemBarcode(itemBarcode);
        itemDialog.discountName = itemListDB.getDiscountFromItemBarcode(itemBarcode);
        itemDialog.mListener = SearchResult.this;

        itemDialog.qtyFromList = qtyInput.get(position);
        itemDialog.discFromList = qtyInput.get(position);

        itemListDB.close();
        itemDialog.show(getFragmentManager(), "");

    }
});

这是我的ItemDialog课程：

public class ItemDialog extends DialogFragment implements OnClickListener{

    //my variables go over here

    public interface onSubmitListener {
        void setOnSubmitListener(String qty, String disc);  
    }  

    @Override  
    public Dialog onCreateDialog(Bundle savedInstanceState) {  

        final Dialog dialog = new Dialog(getActivity());  
        dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  
                WindowManager.LayoutParams.FLAG_FULLSCREEN);  

        dialog.setContentView(R.layout.fragment_item_dialog);  
        setStyle(DialogFragment.STYLE_NORMAL, R.style.MyDialog);

        File imgFile = new  File("/sdcard/Images/test_image.png");
        if(imgFile.exists()){

            Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

            ImageView myImage = (ImageView) findViewById(R.id.imageViewItem);
            myImage.setImageBitmap(myBitmap);

        }

        dialog.setTitle("Item Details");
        dialog.show();  
        //I set more variables here       
        return dialog;  
    }       

}

那么，有没有人知道如何设置imageView在DialogFragment中的源映像呢？我被困在这里，坦白地说，我不知道该怎么做，如果有人能帮我，我会非常感激的。

谢谢。

Answer 1

您需要在inflate下在Dialog Fragment中进行onCreateDialog(...)布局

  LayoutInflater layoutInflater = (LayoutInflater) getActivity()
         .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

  View layout2 = layoutInflater.inflate(R.layout.contact_filter_popup,null);

  dialog.setView(layout2);

然后将您的Imageview引用到特定的layout

   ImageView img=(ImageView)layout2.findViewById(R.id.imageViewItem);

更新：

@Override  
public Dialog onCreateDialog(Bundle savedInstanceState) {  

    final Dialog dialog = new Dialog(getActivity());  

    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  
            WindowManager.LayoutParams.FLAG_FULLSCREEN);  


     LayoutInflater layoutInflater = (LayoutInflater) getActivity()
         .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View layout2 = layoutInflater.inflate(R.layout.contact_filter_popup,null);
    dialog.setContentView(layout2);  

    setStyle(DialogFragment.STYLE_NORMAL, R.style.MyDialog);

    ImageView myImage = (ImageView) layout2.findViewById(R.id.imageViewItem);

    File imgFile = new  File("/sdcard/Images/test_image.png");

    if(imgFile.exists()){

        Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
        myImage.setImageBitmap(myBitmap);

    }

    dialog.setTitle("Item Details");
    dialog.show();  

    return dialog;  
}       

Answer 2

问题是由于生命周期错配造成的。在对话框片段中，当对话框被创建时，并不意味着视图被创建。这将导致IllegalArgumentException，因为片段没有附着在活动上。要克服这一问题，始终在视图在onViewsCreated()/onCreateViews()方法中膨胀之后使用/访问视图。在下面找到我的解决方案，这样做很好。

public class ImageDetailDialog extends DialogFragment implements OnClickListener{

    private String url ;

    private ImageView imgProdDetail;


    /* (non-Javadoc)
     * @see android.support.v4.app.DialogFragment#onCreate(android.os.Bundle)
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        url = getArguments().getString("url");
        setStyle(DialogFragment.STYLE_NO_TITLE, R.style.product_dialog);
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.Fragment#onCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle)
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.image_detail_dialog, null);
        imgProdDetail = (ImageView)view.findViewById(R.id.img_prod_detail);
        view.setOnClickListener(this);
        return view;
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.Fragment#onViewCreated(android.view.View, android.os.Bundle)
     */
    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

            /** Decode/load YOUR IMAGE HERE **/
        imgProdDetail.setImageResource(R.drawable.image);
    }

    /* (non-Javadoc)
     * @see android.support.v4.app.DialogFragment#onCreateDialog(android.os.Bundle)
     */
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        Dialog dialog = super.onCreateDialog(savedInstanceState);
        dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        //not working
        dialog.setCanceledOnTouchOutside(true);
        return dialog;
    }

    /* (non-Javadoc)
     * @see android.view.View.OnClickListener#onClick(android.view.View)
     */
    @Override
    public void onClick(View v) {
        if(v!=imgProdDetail)
            this.dismissAllowingStateLoss();
    }

}

Answer 3

片段没有findViewById方法，您可以在th片段的getView()方法上调用它：

  File imgFile = new  File(“/sdcard/Images/test_image.jpg”);
  if(imgFile.exists()){
    Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
    ImageView myImage = (ImageView) getView().findViewById(R.id.imageViewItem);
    myImage.setImageBitmap(myBitmap);
  }

我假设您已经夸大了DialogFragment的相应视图。

有关更多信息：http://developer.android.com/reference/android/app/Fragment.html#getView()