所以我已经做了好几个小时了，现在凌晨 4:07 我要睡觉了，所以我希望有人能帮助我。
我有一个 ImageResults 对象的 ArrayList，其类定义为：
public class ImageResults {
String _title, _country, _thumbnailURL, _imageURL;
public ImageResults(String title, String country, String thumbnailURL, String imageURL)
{
_title = title;
_country = country;
_thumbnailURL = thumbnailURL;
_imageURL = imageURL;
}
public String getTitle()
{
return _title;
}
public String getCountry()
{
return _country;
}
public String getThumbnailURL()
{
return _thumbnailURL;
}
public String getImageURL()
{
return _imageURL;
}
}
现在为了使用https://github.com/thest1/LazyList我必须从我的 imageresults 类型的数组列表中检索缩略图 url 并将它们放在一个数组中，就像我在这里做的那样
private void populateListBox()
{
String[] imgLst = new String[imagesList.size()];
for(int i = 0; i < imagesList.size();i++)
{
imgLst[i] = (imagesList.get(i)._thumbnailURL);
// Toast t = Toast.makeText(this,imgLst[0] , Toast.LENGTH_SHORT);
// t.show();
}
adapter=new LazyAdapter(this, imgLst);
imageListView.setAdapter(adapter);
}
现在问题是上面的方式不起作用，但是如果我按如下方式单独获取链接，它可以工作，这是链接在原始项目中组织的默认方式
private void populateListBox()
{
String[] imgLst={
"http://www.istartedsomething.com/bingimages/resize.php?i=Velodrome_EN-AU1182456710.jpg&w=300"};
adapter=new LazyAdapter(this, imgLst);
imageListView.setAdapter(adapter);
}
这就是原始项目中链接的组织方式，是的，我 100% 确定这两种方法都以不同的方式返回相同的字符串，一种是从数组列表中的对象中获取它，另一种是我明确声明它。
private String[] mStrings={
"http://www.istartedsomething.com/bingimages/resize.php?i=Velodrome_EN-AU1182456710.jpg&w=300",
"http://www.istartedsomething.com/bingimages/resize.php?i=Velodrome_EN-CA1182456710.jpg&w=300",
"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"};
主要活动课
public class BngPaperActivity extends Activity {
ListView imageListView;
Spinner countrySpinner;
String selectedMonth;
String selectedYear;
LazyAdapter adapter;
ProgressDialog progress;
Dialog date;
getResult getRes;
String ResultsString;
ArrayList<String> monthList = new ArrayList<String>();
ArrayList<ImageResults> imagesList = new ArrayList<ImageResults>();
String dateText;
TextView selectedDateView;
static final int MONTHYEARDATESELECTOR_ID = 3;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
progress = new ProgressDialog(BngPaperActivity.this);
monthList.add("January"); monthList.add("February"); monthList.add("March"); monthList.add("April");
monthList.add("May"); monthList.add("June"); monthList.add("July"); monthList.add("August");
monthList.add("September"); monthList.add("October"); monthList.add("November"); monthList.add("December");
imageListView = (ListView) this.findViewById(R.id.imagesListView);
countrySpinner = (Spinner) this.findViewById(R.id.countrySpinner);
selectedDateView = (TextView) this.findViewById(R.id.selectedDateView);
Button monthYearButton = (Button) this.findViewById(R.id.monthyearBTN);
// set up a listener for when the button is pressed
monthYearButton.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// call the internal showDialog method using the predefined ID
showDialog(MONTHYEARDATESELECTOR_ID);
}
});
}
private DateSlider.OnDateSetListener mMonthYearSetListener =
new DateSlider.OnDateSetListener() {
public void onDateSet(DateSlider view, Calendar selectedDate) {
// update the dateText view with the corresponding date
dateText = (String.format("%tB %tY", selectedDate, selectedDate));
selectedDateView.setText(dateText);
try {
selectedMonth = monthList.indexOf(String.format("%tB", selectedDate)) + 1 +"";
selectedYear = String.format("%tY", selectedDate);
progress.setMessage("Fetching Images... \nPress Back Button To Cancel");
progress.setCancelable(true);
getRes = new getResult(progress,view);
getRes.execute();
try {
ResultsString = getRes.get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
parseResults(ResultsString);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
private void parseResults(String result)
{
Scanner scan = new Scanner(result);
String current = scan.nextLine();
String title = "";
String country = "";
String thumbURL = "";
String imageURL = "";
while(!current.equals("End of file"))
{
if(current.equals("Begin Thumb"))
{
current = scan.nextLine();
title = current.substring(current.indexOf(":")+1);
current = scan.nextLine();
country = current.substring(current.indexOf(":")+1);
current = scan.nextLine();
thumbURL = current.substring(current.indexOf(":")+1);
imageURL = thumbURL.replace("300", "900");
current = scan.nextLine();
}
if(current.equals("End Thumb"))
{
imagesList.add(new ImageResults(title,country,thumbURL,imageURL));
}
current = scan.nextLine();
}
populateListBox();
}
private void populateListBox()
{
//this is not working, i would like this one to work
String[] imgLst = new String[imagesList.size()];
for(int i = 0; i < imagesList.size();i++)
{
imgLst[i] = (imagesList.get(i)._thumbnailURL);
// Toast t = Toast.makeText(this,imgLst[0] , Toast.LENGTH_SHORT);
// t.show();
}
//-----------------------------------
/* This is working
String[] imgLst={
"http://www.istartedsomething.com/bingimages/resize.php?i=Velodrome_EN-AU1182456710.jpg&w=300"};
*/
adapter=new LazyAdapter(this, imgLst);
imageListView.setAdapter(adapter);
}
@Override
protected Dialog onCreateDialog(int id) {
// this method is called after invoking 'showDialog' for the first time
// here we initiate the corresponding DateSlideSelector and return the dialog to its caller
final Calendar c = Calendar.getInstance();
final Calendar minDate = Calendar.getInstance();
minDate.set(Calendar.YEAR, 2009);
minDate.set(Calendar.MONTH, Calendar.JUNE);
final Calendar maxDate = Calendar.getInstance();
maxDate.add(Calendar.DATE, 0);
switch (id) {
case MONTHYEARDATESELECTOR_ID:
return new MonthYearDateSlider(this,mMonthYearSetListener,c,minDate,maxDate);
}
return null;
}
private class getResult extends AsyncTask<String, String, String> {
private final HttpClient Client = new DefaultHttpClient();
private String Content;
private String Error = null;
private ProgressDialog progress;
DateSlider view;
public getResult(ProgressDialog progress, DateSlider view)
{
this.progress = progress;
this.view = view;
}
protected void onPreExecute() {
this.view.dismiss();
this.progress.show();
}
@Override
protected String doInBackground(String... urls) {
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
String responseString = null;
try {
response = httpclient.execute(new HttpGet("http://devleb.com/BngPaper/BngPaperWebService.php?thumbnail=Yes&year="+selectedYear+"&month="+ selectedMonth));
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpStatus.SC_OK){
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
responseString = out.toString();
} else{
//Closes the connection.
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
} catch (ClientProtocolException e) {
//TODO Handle problems..
} catch (IOException e) {
//TODO Handle problems..
}
//Dialog.dismiss();
progress.dismiss();
return responseString;
}
protected void onPostExecute(Void unused) {
this.progress.dismiss();
if (Error != null) {
Toast.makeText(BngPaperActivity.this, Error, Toast.LENGTH_LONG).show();
}
}
}
}