你好我面临一个特殊的问题,我需要下载图像并将它们显示到一个 ListView 对应于他们的特定 TextView's。我拥有的代码成功显示了我需要显示的 TextView's,但我不知道如何在 ListView 中的 TextView 旁边显示所有这些不同的图像。
在 SO 中经历了许多线程之后。最佳答案是通过以下方式解决此问题 1. 懒人列表 2. 通用图片加载器
我已经通过了这两种解决方案。我下载了惰性列表代码,其中 URL 是存储在数组中的硬编码字符串。我想做的是动态创建自己的字符串。将它们存储到缓存中并显示所有相应的图像。
这是我的代码:
public class Tools_ListItemActivity extends ListActivity
{
private Context context;
String s;
private static final String TAG_POSTS = "posts";
private static final String TAG_MDNAME = "mdname";
private static final String TAG_UTCOST = "utcost";
private static final String TAG_IIMG= "iimg";
JSONArray posts = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
s=getIntent().getExtras().getString("url");
new ProgressTask(Tools_ListItemActivity.this).execute();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
}
ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
ListView lv ;
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog;
public ProgressTask(ListActivity activity) {
Log.i("1", "Called");
context = activity;
dialog = new ProgressDialog(context);
}
/** progress dialog to show user that the backup is processing. */
/** application context. */
private Context context;
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
@Override
protected void onPostExecute(final Boolean success) {
if (dialog.isShowing()) {
dialog.dismiss();
}
ListAdapter adapter = new SimpleAdapter(context, jsonlist,
R.layout.activity_toolsitem, new String[] { TAG_IIMG, TAG_MDNAME, TAG_UTCOST }, new int[] {
R.id.imageViewUrl, R.id.mdname, R.id.utcost });
setListAdapter(adapter);
// selecting single ListView item
lv = getListView();
}
protected Boolean doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(s);
try {
posts = json.getJSONArray(TAG_POSTS);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try
{
// looping through All Contacts
for(int i = 0; i < posts.length(); i++){
JSONObject c = posts.getJSONObject(i);
// Storing each json item in variable
String mdname = c.getString(TAG_MDNAME);
String utcost= c.getString(TAG_UTCOST);
String iimg=c.getString(TAG_IIMG);
//Forming the Url of the image to be shown in the list view
String imageUrl="My_App_URL"+iimg;
/* try {
String imageUrl="My_App_URL"+iimg;
ImageView imageView = (ImageView)findViewById(R.id.imageViewUrl);
Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageUrl).getContent());
imageView.setImageBitmap(bitmap);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} */
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_MDNAME, mdname);
map.put(TAG_UTCOST, utcost);
map.put(TAG_IIMG, iimg);
jsonlist.add(map);
} }catch (JSONException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
}
在这里我已经调试并发现 imageUrl 正确形成。 Json 仅返回 jpg 的名称,因此我将其附加到 URL 并将其存储在 imageUrl 中。其他两个 TextView 正在正确解析和显示。如果有人也可以帮助我在 ImageView 中显示图像,那就太好了。谢谢。
更新: 借助 Pankaj (https://github.com/AndroidBegin/Android-JSON-Parse-Images-and-Texts-Tutorial) 共享的链接和 Raghunandan 在下方共享的概念知识,我能够解决我的特定问题。请仔细阅读这些答案以获取详细说明以及延迟加载的实现。很抱歉,因为我离开了两天,所以无法用赏金来奖励答案。
最佳答案
使用 Universal Imageloader 进行延迟加载。将硬编码的 url 替换为图片的 url。
根据您的要求修改以下内容
What's LazyList? .详情请查看此链接。
public class MainActivity extends Activity {
private String[] mStrings={
"http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png",
"http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
"http://a1.twimg.com/profile_images/97470808/icon_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook.png",
"http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
"http://a1.twimg.com/profile_images/74724754/android_logo_normal.png",
"http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
"http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
"http://a3.twimg.com/profile_images/548410609/icon_8_73.png",
"http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
"http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
"http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android_normal.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/121630227/Droid.jpg",
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
"http://a1.twimg.com/profile_images/97470808/icon_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
"http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter_normal.png",
"http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
"http://a1.twimg.com/profile_images/97470808/icon.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
"http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
"http://a1.twimg.com/profile_images/74724754/android_logo.png",
"http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
"http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
"http://a3.twimg.com/profile_images/548410609/icon_8_73_normal.png",
"http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
"http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
"http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
"http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto.jpg",
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
"http://a1.twimg.com/profile_images/957149154/twitterhalf.jpg",
"http://a1.twimg.com/profile_images/97470808/icon_normal.png",
"http://a3.twimg.com/profile_images/511790713/AG_normal.png",
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
"http://a1.twimg.com/profile_images/349012784/android_logo_small.jpg",
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png"
};
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv= (ListView) findViewById(R.id.lv);
lv.setAdapter(new LazyAdapter(this,mStrings));
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/lv"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:focusableInTouchMode="false"
android:listSelector="@android:color/transparent"
android:layout_weight="2.0"
android:divider="#000000"
android:headerDividersEnabled="false"
android:footerDividersEnabled="false"
android:dividerHeight="8dp"
android:drawSelectorOnTop="false"
/>
</RelativeLayout>
public class LazyAdapter extends BaseAdapter {
private Activity activity;
private String data[];
private LayoutInflater inflater=null;
public ImageLoader imageLoader;
DisplayImageOptions options;
public LazyAdapter(Activity a, String[] d) {
activity = a;
data=d;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
File cacheDir = StorageUtils.getOwnCacheDirectory(a, "MyFolderCache");
// Get singletone instance of ImageLoader
imageLoader = ImageLoader.getInstance();
// Create configuration for ImageLoader (all options are optional)
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(a)
// You can pass your own memory cache implementation
.discCacheExtraOptions(1024, 1024, CompressFormat.PNG, 100)
.discCache(new UnlimitedDiscCache(cacheDir)) // You can pass your own disc cache implementation
.discCacheFileNameGenerator(new HashCodeFileNameGenerator())
.enableLogging()
.build();
// Initialize ImageLoader with created configuration. Do it once.
imageLoader.init(config);
//imageLoader.init(ImageLoaderConfiguration.createDefault(a));
// imageLoader=new ImageLoader(activity.getApplicationContext());
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.ic_launcher)
.cacheInMemory()
.cacheOnDisc()
.displayer(new RoundedBitmapDisplayer(20))
.build();
}
public int getCount() {
return data.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
ViewHolder vh = new ViewHolder();;
if(convertView==null)
{
vi = inflater.inflate(R.layout.row, null);
vh.iv=(ImageView)vi.findViewById(R.id.ivv);
vh.pb= (ProgressBar)vi.findViewById(R.id.pb);
vh.tv = (TextView) vi.findViewById(R.id.textView1);
vh.tv1= (TextView) vi.findViewById(R.id.textView2);
}
vh.tv.setText("Image in postion =");
vh.tv1.setText(""+position);
display(vh.iv, data[position], vh.pb);
//imageLoader.displayImage(data.get(position).toString(), image,options);
return vi;
}
public void display(ImageView img, String url, final ProgressBar spinner)
{
imageLoader.displayImage(url, img, options, new ImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
spinner.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
spinner.setVisibility(View.GONE);
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
spinner.setVisibility(View.GONE);
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
}
});
}
public static class ViewHolder
{
ImageView iv;
TextView tv,tv1;
ProgressBar pb;
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/ic_launcher" />
<ProgressBar
android:id="@+id/pb"
android:layout_centerInParent="true"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView2"
android:layout_alignParentLeft="true"
android:layout_marginBottom="21dp"
android:layout_marginLeft="31dp"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentBottom="true"
android:text="TextView" />
</RelativeLayout>
在 list 中添加权限
<uses-permission android:name="android.permission.INTERNET"/>
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我试过重新启动apache,缓存的页面仍然出现,所以一定有一个文件夹在某个地方。我没有“公共(public)/缓存”,那么我还应该查看哪些其他地方?是否有一个URL标志也可以触发此效果? 最佳答案 您需要触摸一个文件才能清除phusion,例如:touch/webapps/mycook/tmp/restart.txt参见docs 关于ruby-如何在Ubuntu中清除RubyPhusionPassenger的缓存?,我们在StackOverflow上找到一个类似的问题:
尝试在我的RoR应用程序中实现计数器缓存列时出现错误Unknownkey(s):counter_cache。我在这个问题中实现了模型关联:Modelassociationquestion这是我的迁移:classAddVideoVotesCountToVideos0Video.reset_column_informationVideo.find(:all).eachdo|p|p.update_attributes:videos_votes_count,p.video_votes.lengthendenddefself.downremove_column:videos,:video_vot
我有带有Logo图像的公司模型has_attached_file:logo我用他们的Logo创建了许多公司。现在,我需要添加新样式has_attached_file:logo,:styles=>{:small=>"30x15>",:medium=>"155x85>"}我是否应该重新上传所有旧数据以重新生成新样式?我不这么认为……或者有什么rake任务可以重新生成样式吗? 最佳答案 参见Thumbnail-Generation.如果rake任务不适合你,你应该能够在控制台中使用一个片段来调用重新处理!关于相关公司
目前,Itembelongs_toCompany和has_manyItemVariants。我正在尝试使用嵌套的fields_for通过Item表单添加ItemVariant字段,但是使用:item_variants不显示该表单。只有当我使用单数时才会显示。我检查了我的关联,它们似乎是正确的,这可能与嵌套在公司下的项目有关,还是我遗漏了其他东西?提前致谢。注意:下面的代码片段中省略了不相关的代码。编辑:不知道这是否相关,但我正在使用CanCan进行身份验证。routes.rbresources:companiesdoresources:itemsenditem.rbclassItemi
如果我在模型中设置验证消息validates:name,:presence=>{:message=>'Thenamecantbeblank.'}我如何让该消息显示在闪光警报中,这是我迄今为止尝试过的方法defcreate@message=Message.new(params[:message])if@message.valid?ContactMailer.send_mail(@message).deliverredirect_to(root_path,:notice=>"Thanksforyourmessage,Iwillbeintouchsoon")elseflash[:error]