我已经使用gridview布局在我的应用程序中实现了通用图像加载器。
当我按下按钮时,我想向Urls数组添加新的imageUrl。
我设法做到了,但是当我刷新imageList时,我仍然仍然只能看到StartUp数组中的图像。
如何使用新的Array更新gridView?
编辑
主要活动
public class MainActivity extends Activity {
Button btnView;
private ListView listView;
Socket client;
PrintWriter printwriter;
EditText textField;
Button button;
String messsage;
ObjectInputStream input;
ObjectOutputStream output;
int counter = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
setContentView(R.layout.ac_home);
//startRunning();
}
public void onImageGridClick(View view) {
Intent intent = new Intent(this, ViewImages.class);
startActivity(intent);
}
public void onTakeImageClick(View view) throws IOException {
ViewImages.addImg();
}
}
这是ViewImage类
public class ViewImages extends Activity {
private ListView listView;
ImageLoader loader;
private static ImageListAdapter adapter;
private static List<String> mItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mItems = new ArrayList<String>();
mItems.add("http://195.178.234.228/images/image8.jpg");
mItems.add("http://195.178.234.228/images/image7.jpg");
adapter = new ImageListAdapter(this, mItems);
//
listView = (ListView)findViewById(R.id.listView);
listView.setAdapter(adapter);
}
public static void addImg(){
mItems.add("http://195.178.234.228/images/image10.jpg");
adapter.notifyDataSetChanged();
}
}
ImageListAdapter
public class ImageListAdapter extends BaseAdapter {
List<String> list;
int size;
private Context context;
private ImageLoader imageLoader;
public ImageListAdapter(Context context,List<String> list) {
this.context = context;
this.list = list;
imageLoader = ImageLoader.getInstance();
imageLoader.clearDiscCache();
imageLoader.clearMemoryCache();
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int arg0) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup viewGroup) {
View v = convertView;
ViewHolder vh = null;
if (v == null) {
v = View.inflate(context, R.layout.list_item, null);
vh = new ViewHolder();
vh.imageView = (ImageView) v.findViewById(R.id.imageView);
v.setTag(vh);
}
else {
vh = (ViewHolder)v.getTag();
}
DisplayImageOptions options = new DisplayImageOptions.Builder()
.cacheOnDisc()
.build();
imageLoader.displayImage(list.get(position), vh.imageView, options);
return v;
}
private class ViewHolder {
ImageView imageView;
}
}
最佳答案
您的方法onTakeImageClick()无效,如果您需要将图像URL添加到ViewImages Activity中,一种方法是通过intent.putExtra()方法。
Intent intent = new Intent(this, ViewImages.class);
intent.putExtra("ImageName" , "ImageUrl");
startActivity(intent);
您可以通过以下方式获取此额外费用:
getIntent().getStringExtra("ImageName");
另一件事是在您的imageViewAdapter中,方法getItem()返回null而不是return
list.get(arg0);
此方法将返回位置arg0处的视图。
关于java - 更新listView/刷新适配器,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/23808237/