Question

我有一个应用程序，其中我想要更新我的列表视图与选择的图像单击列表视图行上的按钮时的设备库。但是我无法在列表视图中显示它。要在listview上获取图像需要做哪些更改。这是我的代码。

    public class MainActivity extends Activity {
 ArrayList<Contact> imageArry = new ArrayList<Contact>();
 ContactImageAdapter adapter;
 Bitmap bmp;
 int posi;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  // add image and text in arraylist
  imageArry.add(new Contact(R.drawable.ic_launcher, "FaceBook"));
  imageArry.add(new Contact(R.drawable.ic_launcher, "Google"));
  imageArry.add(new Contact(R.drawable.ic_launcher, "Ical"));
  imageArry.add(new Contact(R.drawable.ic_launcher, "Outlook"));
  imageArry.add(new Contact(R.drawable.ic_launcher, "Twitter"));

  // add data in contact image adapter
  adapter = new ContactImageAdapter(this, R.layout.fragment_main, imageArry);
  ListView dataList = (ListView) findViewById(R.id.list);
  dataList.setAdapter(adapter);

 }
 public void removeAtomPayOnClickHandler(View v) {
        Contact itemToRemove = (Contact)v.getTag();
        //adapter.remove(itemToRemove);
        Intent i = new Intent(
                Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

        startActivityForResult(i, 0);
        //adapter.insert(new AtomPayment("bbbb", 0), 0);
    }
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
         posi=ContactImageAdapter.pos;
        if ( resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();
            // ImageView iv= (ImageView) findViewById(R.id.imageView2);
             bmp=  BitmapFactory.decodeFile(picturePath);
             //iv.setImageBitmap(BitmapFactory.decodeFile(picturePath));
             imageArry.add(new Contact(R.drawable.ic_launcher, "Twitter"));
             System.out.println("aaaaaaaaaaaaaaaaaaaaaa"+ContactImageAdapter.pos+"-----"+posi);
        }


    }
}

这是contact.java的代码

    public class Contact {

 int image;
 String name;
 public int getImage() {
  return image;
 }
 public void setImage(int image) {
  this.image = image;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public Contact(int image, String name) {
  super();
  this.image = image;
  this.name = name;
 }

}

和适配器类

public class ContactImageAdapter extends ArrayAdapter<Contact>{
  Context context;
    public  static int pos;
     int layoutResourceId;   
      ArrayList<Contact> data=new ArrayList<Contact>();
     public ContactImageAdapter(Context context, int layoutResourceId, ArrayList<Contact> data) {
         super(context, layoutResourceId, data);
         this.layoutResourceId = layoutResourceId;
         this.context = context;
         this.data = data;
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         View row = convertView;
         ImageHolder holder = null;
         pos=position;
         if(row == null)
         {
             LayoutInflater inflater = ((Activity)context).getLayoutInflater();
             row = inflater.inflate(layoutResourceId, parent, false);

             holder = new ImageHolder();
             holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
             holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
             row.setTag(holder);
         }
         else
         {
             holder = (ImageHolder)row.getTag();
         }

         Contact myImage = data.get(position);
         holder.txtTitle.setText(myImage.name);
            int outImage=myImage.image;
         holder.imgIcon.setImageResource(outImage);
        return row;

     }

     static class ImageHolder
     {
         ImageView imgIcon;
         TextView txtTitle;
     }
 }

Answer 1

每次更新列表时都使用notifyDataSetChanged。然后notifyDataSetChanged将起作用。请参阅this。

Answer 2

在图像数组中添加新图像...并调用notifyDataSetChanged..it将刷新列表视图请参阅此链接，详细解释Android. How does notifyDataSetChanged() method and ListViews work?

如何使用从库中选择的新图像更新列表视图

2 个答案: