android-如何在arraylist中添加排球图像请求？
作者：互联网
我在代码2下面有东西,Volley请求设置图像,数组列表适配器显示静态图像.
我需要帮助将排球请求添加到数组列表中,我希望排球图像显示在arraylist中
请问该怎么办？
(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();
}
});
}
arraylistadapter
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;
}
}
解决方法:
在其他帖子中,您需要我的帮助.
我的图像来自作为Json字符串Base64编码的其余服务器.然后我做下一个：
public View getView(int position, View convertView, ViewGroup parent) {
final ObjectLogados o = items.get(position);
final ViewHolder holder;
View vi = convertView;
if (vi == null){
LayoutInflater inflater = context.getLayoutInflater();
vi = inflater.inflate(R.layout.singlerowlog, null);// e' preciso fazer o inflate pois a view nao ainda nao esta em activity alguma
holder = new ViewHolder();
holder.ivImgMedLog= (ImageView) vi.findViewById(R.id.ivp_imagemedlog) ;
holder.tv_usuario = (TextView) vi.findViewById(R.id.tv_hnomemedlogado);
vi.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv_usuario.setText(o.getUsuario());
String imageKey="MED"+String.valueOf(o.getNr_usuario());
final Bitmap bitmap = Common.getInstance().getBitmapFromMemCache(imageKey);
if (bitmap != null) {
holder.ivImgMedLog.setImageBitmap(bitmap);
}else {
holder.ivImgMedLog.setImageDrawable(context.getResources()
.getDrawable(R.drawable.empty));
downloadimage(holder.ivImgMedLog,o.getNr_usuario());
}
return vi;
}
static class ViewHolder {
TextView tv_usuario;
ImageView ivImgMedLog;
}
private void downloadimage(final ImageView imageView,final int nr){
//final ImageView imageView=imV;
String url=Common.getServerURL() + "\"RetrieveImageStaff\"";
JSONArray ja = new JSONArray();
ja.put(nr);
JSONObject jsonBody = new JSONObject();
try {
jsonBody.put("_parameters", ja);
} catch (JSONException e) {
e.printStackTrace();
}
JsonObjectRequest jr = new JsonObjectRequest(Request.Method.POST, url,
jsonBody, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
JSONObject anEntry = null, entries = null;
String ims = "";
try { // TODO Auto-generated method stub
JSONArray LResult = response.getJSONArray("result");
String s = LResult.get(0).toString();
anEntry = new JSONObject(s);
ims = anEntry.getString("imagem");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap decodedByte = null;
try {
if (!TextUtils.isEmpty(ims)) {
byte[] decodedString = Base64.decode(ims, Base64.DEFAULT);
decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
if (imageView != null) {
if (decodedByte != null) {
imageView.setImageBitmap(decodedByte);
Common.getInstance().addBitmapToMemoryCache("MED"+String.valueOf(nr), decodedByte);
} else {
imageView.setImageDrawable(imageView.getContext().getResources()
.getDrawable(R.drawable.empty));
}
}
} else {
imageView.setImageDrawable(imageView.getContext().getResources()
.getDrawable(R.drawable.empty));
}
}catch (Exception e){
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void one rrorResponse(VolleyError error) {
// TODO Auto-generated method stub
//Log.v(TAG, error.getMessage());
Toast.makeText(context, "Erro adquirindo imagem...." + error.getMessage(), Toast.LENGTH_SHORT).show();
error.printStackTrace();
}
});
jr.setRetryPolicy(new DefaultRetryPolicy(Common.DEFAULT_TIMEOUT_MS,
Common.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
Common.getInstance().addToReqQueue(jr, "jreq"); //reqQueue.add(jr);
}
您可以更改使用排球的请求并获取图像.因此,您可以将https://developer.android.com/training/volley/request.html#request-image中描述的代码更改为类似于以下内容的代码：
ImageView mImageView;
String url = "http://i.imgur.com/7spzG.png";
mImageView = (ImageView) findViewById(R.id.myImage);
...
// Retrieves an image specified by the URL, displays it in the UI.
ImageRequest request = new ImageRequest(url,
new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap bitmap) {
mImageView.setImageBitmap(bitmap);
}
}, 0, 0, null,
new Response.ErrorListener() {
public void one rrorResponse(VolleyError error) {
mImageView.setImageResource(R.drawable.image_load_error);
}
});
// Access the RequestQueue through your singleton class.
MySingleton.getInstance(this).addToRequestQueue(request);
标签：android-volley,android 来源： https://codeday.me/bug/20191028/1948748.html