得到一个URL动态地的形象 [英] get a image of a url dynamicly
问题描述
可能重复：结果
<一href=\"http://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listview\">Android - 如何做的ListView图像的延迟加载
我尝试做什么
大家好，我只是建造了应用程序为我的YouTube的频道。为此，我使用JSON来获取信息并传递到我的ListView超过SimpleListAdapter。
Hello everyone, I just builded a App for my Youtube-Channel. For this I used JSON to get the information and pass that into my ListView over a SimpleListAdapter.
现在，图像不到风度显示出来，因为我只是URL链接到我的ImageView。
Now, the image dosn't show up, because I only link the URL to my ImageView.
问
我怎样才能下载图像并将其链接到我的ListView的正确路线。我找到了一种方法来下载他们，但是这不是动态地，我怎么可以这样做：
如何下载图片
How can I download the Image and link it to the correct line of my ListView. I found a way to download them but this isn't dynamicly, how can I do this: How to Download Image
一个codeSAMPLE或教程将是巨大的！到这里，你找到我活动的code和布局文件中。
A Codesample or a Tutorial would be great! Down here you find the Code of my Activity and the Layout-File.
code
test2.class
test2.class
package de.stepforward;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class test2 extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String result = "";
String line = null;
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
//get the Data from URL
try{
URL url = new URL("http://gdata.youtube.com/feeds/mobile/users/TheStepForward/uploads?alt=json&format=1");
URLConnection conn = url.openConnection();
StringBuilder sb = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
//read d response till d end
while ((line = rd.readLine()) != null) {
sb.append(line + "\n");
}
result = sb.toString();
Log.v("log_tag", "Append String " + result);
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
try{
JSONObject json = new JSONObject(result);
JSONObject feed = json.getJSONObject("feed");
JSONArray entrylist = feed.getJSONArray("entry");
for(int i=0;i<entrylist.length();i++){
//Get Title
JSONObject movie = entrylist.getJSONObject(i);
JSONObject title = movie.getJSONObject("title");
String txtTitle = title.getString("$t");
Log.d("Title", txtTitle);
//Get Description
JSONObject content = movie.getJSONObject("content");
String txtContent = content.getString("$t");
Log.d("Content", txtContent);
//Get Link
JSONArray linklist = movie.getJSONArray("link");
JSONObject link = linklist.getJSONObject(4);
String txtLink = link.getString("href");
Log.d("Link", txtLink);
//Get Thumbnail
JSONObject medialist = movie.getJSONObject("media$group");
JSONArray thumblist = medialist.getJSONArray("media$thumbnail");
JSONObject thumb = thumblist.getJSONObject(3);
String txtThumb = thumb.getString("url");
Log.d("Thumb", txtThumb.toString());
//String Array daraus machen und in Hashmap füllen
HashMap<String, String> map = new HashMap<String, String>();
map.put("Thumb", txtThumb);
map.put("Title", txtTitle);
map.put("Content", txtContent);
map.put("Link", txtLink);
mylist.add(map);
}
ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.lit,
new String[] { "Thumb","Title","Content","Link"},
new int[] { R.id.img_video,R.id.txt_title,R.id.txt_subtitle});
setListAdapter(adapter);
}catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
}
}
lit.xml
lit.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/Placeholder"
xmlns:android="http://schemas.android.com/apk/res/android"
android:paddingBottom="10dp"
android:paddingTop="10dp"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/Content"
android:layout_width="fill_parent"
android:layout_height="60dp">
<ImageView
android:id="@+id/img_video"
android:layout_width="80dp"
android:layout_height="60dp">
</ImageView>
<TableLayout
android:id="@+id/Text"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/Content"
android:paddingLeft="5dp">
<TableRow
android:id="@+id/TextTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/txt_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="5dp"
android:textColor="#FFFFFF"
android:textStyle="bold" >
</TextView>
</TableRow>
<TableRow
android:id="@+id/TextContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/txt_subtitle"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:paddingBottom="5dp"
android:textColor="#FFFFFF" android:textSize="7dp">
</TextView>
</TableRow>
</TableLayout>
</LinearLayout>
</RelativeLayout>
感谢您提前帮助。
Thank you for the help in Advance.
此致
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推荐答案
您好：这个问题已经得到了在这里得到解答：<一href=\"http://stackoverflow.com/questions/541966/android-how-do-i-do-a-lazy-load-of-images-in-listview\">Android - 我该如何进行图像的延迟加载ListView中 - 你需要的是一个延迟加载的ImageView
Hello this question already got answered here: Android - How do I do a lazy load of images in ListView - What you need is a lazy loading ImageView.
这篇关于得到一个URL动态地的形象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！
