【发布时间】：2015-08-19 16:13:49
【问题描述】：
我有下面的代码 2 东西，Volley 请求设置图像，array list adapter 显示静态图像。
我需要帮助在数组列表中添加凌空请求，我想要在数组列表中显示凌空图像
请问你能帮我怎么做吗？
（请注意，我已经有一个 phpscript 可以在 json 中向我发送图像的路径 url）
代码：main_activity
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RequestQueue mRequestQueue;
final String IMAGE_URL =
"http://developer.android.com/images/training/system-ui.png";
mNetworkImageView = (NetworkImageView) findViewById(R.id.networkImageView);
//Instantiate the cache
Cache cache = new DiskBasedCache(getCacheDir(), 1024 * 1024); // 1MB cap
//Set up the network to use HttpURLConnection as the HTTP client.
Network network = new BasicNetwork(new HurlStack());
//Instantiate the RequestQueue with the cache and network.
mRequestQueue = new RequestQueue(cache, network);
//Start the queue
mRequestQueue.start();
ImageLoader mImageLoader = new ImageLoader(mRequestQueue, new LruBitmapCache(
LruBitmapCache.getCacheSize(mContext)));
mNetworkImageView.setImageUrl(IMAGE_URL, mImageLoader);
CustomListAdapter adapter=new CustomListAdapter(this, itemname, imgid);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String Slecteditem= itemname[+position];
Toast.makeText(getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();
}
});
}
数组列表适配器
包 com.example.p;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class CustomListAdapter extends ArrayAdapter<String> {
private final Activity context;
private final String[] itemname;
private final Integer[] imgid;
public CustomListAdapter(Activity context, String[] itemname, Integer[] imgid) {
super(context, R.layout.mylist, itemname);
// TODO Auto-generated constructor stub
this.context=context;
this.itemname=itemname;
this.imgid=imgid;
}
public View getView(int position,View view,ViewGroup parent) {
LayoutInflater inflater=context.getLayoutInflater();
View rowView=inflater.inflate(R.layout.mylist, null,true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
TextView extratxt = (TextView) rowView.findViewById(R.id.textView1);
txtTitle.setText(itemname[position]);
imageView.setImageResource(imgid[position]);
extratxt.setText("Description "+itemname[position]);
return rowView;
};
}
和Lrubitmapcache
package com.example.p;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;
import android.util.DisplayMetrics;
import com.android.volley.toolbox.ImageLoader.ImageCache;
public class LruBitmapCache extends LruCache<String, Bitmap>
implements ImageCache {
public LruBitmapCache(int maxSize) {
super(maxSize);
}
public LruBitmapCache(Context ctx) {
this(getCacheSize(ctx));
}
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
}
@Override
public Bitmap getBitmap(String url) {
return get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
// Returns a cache size equal to approximately three screens worth of images.
public static int getCacheSize(Context ctx) {
final DisplayMetrics displayMetrics = ctx.getResources().
getDisplayMetrics();
final int screenWidth = displayMetrics.widthPixels;
final int screenHeight = displayMetrics.heightPixels;
// 4 bytes per pixel
final int screenBytes = screenWidth * screenHeight * 4;
return screenBytes * 3;
}
}
【问题讨论】：