如何添加一个ArrayList凌空图像的要求? [英] how to add volley image request in an arraylist?
问题描述
我有以下code两件事情,排球
要求,即树立一个形象,而数组列表适配器
,显示静态图像。
我需要帮助添加凌空请求数组列表中,我想
ArrayList中所示的凌空图片怎么做,你能帮助我吗?
(注意我已经有一个phpscript为给我一个JSON图像的路径URL)的
在code:main_activity
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
请求队列mRequestQueue;
最后弦乐IMAGE_URL =
http://developer.android.com/images/training/system-ui.png;
mNetworkImageView =(NetworkImageView)findViewById(R.id.networkImageView);
//初始化Cache
缓存缓存=新DiskBasedCache(getCacheDir(),1024 * 1024); // 1MB帽
//设置为使用的HttpURLConnection作为HTTP客户端网络。
网络网络=新BasicNetwork(新HurlStack());
//实例化缓存和网络的请求队列。
mRequestQueue =新的请求队列(缓存,网络);
//开始排队
mRequestQueue.start();
ImageLoader的mImageLoader =新ImageLoader的(mRequestQueue,新LruBitmapCache(
LruBitmapCache.getCacheSize(mContext)));
mNetworkImageView.setImageUrl(IMAGE_URL,mImageLoader);
CustomListAdapter适配器=新CustomListAdapter(这一点,了itemname,imgid);
名单=(ListView控件)findViewById(R.id.list);
list.setAdapter(适配器);
list.setOnItemClickListener(新OnItemClickListener(){
@覆盖
公共无效onItemClick(适配器视图<>母公司视图中查看,
INT位置,长的id){
// TODO自动生成方法存根
字符串Slecteditem =了itemname [+位置]
Toast.makeText(getApplicationContext(),Slecteditem,Toast.LENGTH_SHORT).show();
}
});
}
arraylistadapter
包com.example.p;
进口android.app.Activity;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.ArrayAdapter;
进口android.widget.ImageView;
进口android.widget.TextView;
公共类CustomListAdapter扩展ArrayAdapter<字符串> {
私人最终活动范围内;
私人最终的String []了itemname;
私人最终整数[] imgid;
公共CustomListAdapter(活动的背景下,的String []了itemname,整数[] imgid){
超(背景下,R.layout.mylist,了itemname);
// TODO自动生成构造函数存根
this.context =背景;
this.itemname =了itemname;
this.imgid = imgid;
}
公共查看getView(INT的立场,观点来看,一个ViewGroup父){
LayoutInflater充气= context.getLayoutInflater();
查看rowView = inflater.inflate(R.layout.mylist,空,真正的);
TextView的txtTitle =(TextView中)rowView.findViewById(R.id.item);
ImageView的ImageView的=(ImageView的)rowView.findViewById(R.id.icon);
TextView的extratxt =(TextView中)rowView.findViewById(R.id.textView1);
txtTitle.setText(了itemname [位置]);
imageView.setImageResource(imgid [位置]);
extratxt.setText(说明+了itemname [位置]);
返回rowView;
};
}
和Lrubitmapcache
包com.example.p;
进口android.content.Context;
进口android.graphics.Bitmap;
进口android.support.v4.util.LruCache;
进口android.util.DisplayMetrics;
进口com.android.volley.toolbox.ImageLoader.ImageCache;
公共类LruBitmapCache扩展LruCache<字符串,位图>
实现ImageCache {
公共LruBitmapCache(INT MAXSIZE){
超(MAXSIZE);
}
公共LruBitmapCache(上下文CTX){
这个(getCacheSize(CTX));
}
@覆盖
保护INT整型尺寸(字符串键,位图值){
返回value.getRowBytes()* value.getHeight();
}
@覆盖
公共位图getBitmap(字符串URL){
得到的回报(URL);
}
@覆盖
公共无效putBitmap(字符串URL,位图位图){
把(URL,位图);
}
//返回一个缓存大小等于约三屏的图像。
公共静态INT getCacheSize(上下文CTX){
最后DisplayMetrics displayMetrics = ctx.getResources()。
getDisplayMetrics();
最终诠释屏幕宽度= displayMetrics.widthPixels;
最终诠释screenHeight = displayMetrics.heightPixels;
每像素// 4字节
最终诠释screenBytes =屏幕宽度* screenHeight * 4;
返回screenBytes * 3;
}
}
其他职位,你找我帮忙。 我的图片来自于一个REST服务器为JSON字符串的Base64 codeD。然后,我做了下:
公开查看getView(INT位置,查看convertView,ViewGroup中父){
最后ObjectLogados O = items.get(位置);
最后ViewHolder持有人;
查看VI = convertView;
如果(六== NULL){
LayoutInflater充气= context.getLayoutInflater();
VI = inflater.inflate(R.layout.singlerowlog,NULL); // E'preciso FAZERØ充气的POI视图孬孬ainda ESTA EM活动alguma
持有人=新ViewHolder();
holder.ivImgMedLog =(ImageView的)vi.findViewById(R.id.ivp_imagemedlog);
holder.tv_usuario =(TextView中)vi.findViewById(R.id.tv_hnomemedlogado);
vi.setTag(保持器);
}
其他 {
支架=(ViewHolder)convertView.getTag();
}
holder.tv_usuario.setText(o.getUsuario());
串imageKey =MED+将String.valueOf(o.getNr_usuario());
最后的位图位= Common.getInstance()getBitmapFromMemCache(imageKey)。
如果(位图!= NULL){
holder.ivImgMedLog.setImageBitmap(位);
}其他 {
holder.ivImgMedLog.setImageDrawable(context.getResources()
.getDrawable(R.drawable.empty));
downloadimage(holder.ivImgMedLog,o.getNr_usuario());
}
返回六;
}
静态类ViewHolder {
TextView的tv_usuario;
ImageView的ivImgMedLog;
}
私人无效downloadimage(最终的ImageView ImageView的,最终诠释NR){
//最后的ImageView ImageView的= IMV;
字符串URL = Common.getServerURL()+\RetrieveImageStaff \;
JSONArray JA =新JSONArray();
ja.put(NR);
JSONObject的jsonBody =新的JSONObject();
尝试 {
jsonBody.put(_参数,JA);
}赶上(JSONException E){
e.printStackTrace();
}
JsonObjectRequest JR =新JsonObjectRequest(Request.Method.POST,网址,
jsonBody,新Response.Listener<的JSONObject>(){
@覆盖
公共无效onResponse(JSONObject的响应){
JSONObject的anEntry =空,条目= NULL;
字符串IMS =;
尝试{// TODO自动生成方法存根
JSONArray LRESULT = response.getJSONArray(结果);
字符串s = LResult.get(0)的ToString();
anEntry =新的JSONObject(S);
IMS = anEntry.getString(IMAGEM);
}赶上(JSONException E){
// TODO自动生成的catch块
e.printStackTrace();
}
位图德codedByte = NULL;
尝试 {
如果(!TextUtils.isEmpty(IMS)){
byte []的德codedString = Base64.de code(IMS,Base64.DEFAULT);
德codedByte = BitmapFactory.de codeByteArray(德codedString,0,德codedString.length);
如果(ImageView的!= NULL){
如果(德codedByte!= NULL){
imageView.setImageBitmap(德codedByte);
。Common.getInstance()addBitmapToMemoryCache(MED+将String.valueOf(NR),德codedByte);
} 其他 {
imageView.setImageDrawable(imageView.getContext()。getResources()
.getDrawable(R.drawable.empty));
}
}
} 其他 {
imageView.setImageDrawable(imageView.getContext()。getResources()
.getDrawable(R.drawable.empty));
}
}赶上(例外五){
e.printStackTrace();
}
}
},新Response.ErrorListener(){
@覆盖
公共无效onErrorResponse(VolleyError错误){
// TODO自动生成方法存根
//Log.v(TAG,error.getMessage());
Toast.makeText(上下文,ERRO adquirindo IMAGEM ....+ error.getMessage(),Toast.LENGTH_SHORT).show();
error.printStackTrace();
}
});
jr.setRetryPolicy(新DefaultRetryPolicy(Common.DEFAULT_TIMEOUT_MS,
Common.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
。Common.getInstance()addToReqQueue(JR,jreq); //reqQueue.add(jr);
}
您可以更改使用凌空并获得图像的要求。所以,你可以在的描述更改code https://developer.android.com/intl/ja/training/volley/request.html#request-image 以类似于:
ImageView的mImageView;
字符串URL =http://i.imgur.com/7spzG.png;
mImageView =(ImageView的)findViewById(R.id.myImage);
...
//获取由URL指定的图像,在用户界面中显示出来。
ImageRequest请求=新ImageRequest(URL,
新Response.Listener<位图>(){
@覆盖
公共无效onResponse(位图位图){
mImageView.setImageBitmap(位);
}
},0,0,null,则
新Response.ErrorListener(){
公共无效onErrorResponse(VolleyError错误){
mImageView.setImageResource(R.drawable.image_load_error);
}
});
//通过你的单例类访问请求队列。
MySingleton.getInstance(本).addToRequestQueue(要求);
I have below code 2 things , Volley
request that set an image , and array list adapter
that show static images.
I need help to add the volley request in the array list , I want the volley images shown in the arraylist
How to do that can you help me please?
(note I already have a phpscript for that send me in a json the path url of images)
The code :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
package 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;
};
}
and 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;
}
}
in other post you ask me for help. My image comes from a rest server as Json string Base64 coded. Then I do the next:
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 onErrorResponse(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);
}
You can change the request to use volley and get a image. So, you can change the code as described in https://developer.android.com/intl/ja/training/volley/request.html#request-image to something similar to:
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 onErrorResponse(VolleyError error) {
mImageView.setImageResource(R.drawable.image_load_error);
}
});
// Access the RequestQueue through your singleton class.
MySingleton.getInstance(this).addToRequestQueue(request);
这篇关于如何添加一个ArrayList凌空图像的要求?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!