这就是我在活动中获取多张照片的方式。您可以使用其中的一部分来适应您的逻辑。我用它从相册中获取 Facebook 图片。所以我的需求（我假设）与您的需求不同。但同样，逻辑可能对你有用。
注意：这会很长。;-)
这些是通过活动使用的全局声明：
// HOLD THE URL TO MAKE THE API CALL TO
private String URL;
// STORE THE PAGING URL
private String pagingURL;
// FLAG FOR CURRENT PAGE
int current_page = 1;
// BOOLEAN TO CHECK IF NEW FEEDS ARE LOADING
Boolean loadingMore = true;
Boolean stopLoadingData = false;
这是获取初始图像集的代码块：
private class getPhotosData extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
// CHANGE THE LOADING MORE STATUS TO PREVENT DUPLICATE CALLS FOR
// MORE DATA WHILE LOADING A BATCH
loadingMore = true;
// SET THE INITIAL URL TO GET THE FIRST LOT OF ALBUMS
URL = "https://graph.facebook.com/" + initialAlbumID
+ "/photos&access_token="
+ Utility.mFacebook.getAccessToken() + "?limit=10";
try {
HttpClient hc = new DefaultHttpClient();
HttpGet get = new HttpGet(URL);
HttpResponse rp = hc.execute(get);
if (rp.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String queryAlbums = EntityUtils.toString(rp.getEntity());
JSONObject JOTemp = new JSONObject(queryAlbums);
JSONArray JAPhotos = JOTemp.getJSONArray("data");
// IN MY CODE, I GET THE NEXT PAGE LINK HERE
getPhotos photos;
for (int i = 0; i < JAPhotos.length(); i++) {
JSONObject JOPhotos = JAPhotos.getJSONObject(i);
// Log.e("INDIVIDUAL ALBUMS", JOPhotos.toString());
if (JOPhotos.has("link")) {
photos = new getPhotos();
// GET THE ALBUM ID
if (JOPhotos.has("id")) {
photos.setPhotoID(JOPhotos.getString("id"));
} else {
photos.setPhotoID(null);
}
// GET THE ALBUM NAME
if (JOPhotos.has("name")) {
photos.setPhotoName(JOPhotos.getString("name"));
} else {
photos.setPhotoName(null);
}
// GET THE ALBUM COVER PHOTO
if (JOPhotos.has("picture")) {
photos.setPhotoPicture(JOPhotos
.getString("picture"));
} else {
photos.setPhotoPicture(null);
}
// GET THE PHOTO'S SOURCE
if (JOPhotos.has("source")) {
photos.setPhotoSource(JOPhotos
.getString("source"));
} else {
photos.setPhotoSource(null);
}
arrPhotos.add(photos);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// SET THE ADAPTER TO THE GRIDVIEW
gridOfPhotos.setAdapter(adapter);
// CHANGE THE LOADING MORE STATUS
loadingMore = false;
}
}
这是为了检测用户何时滚动到最后并获取新的图像集：
// ONSCROLLLISTENER
gridOfPhotos.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
int lastInScreen = firstVisibleItem + visibleItemCount;
if ((lastInScreen == totalItemCount) && !(loadingMore)) {
if (stopLoadingData == false) {
// FETCH THE NEXT BATCH OF FEEDS
new loadMorePhotos().execute();
}
}
}
});
最后，这就是我获取下一组图像的方式：
private class loadMorePhotos extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
// SET LOADING MORE "TRUE"
loadingMore = true;
// INCREMENT CURRENT PAGE
current_page += 1;
// Next page request
URL = pagingURL;
try {
HttpClient hc = new DefaultHttpClient();
HttpGet get = new HttpGet(URL);
HttpResponse rp = hc.execute(get);
if (rp.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String queryAlbums = EntityUtils.toString(rp.getEntity());
// Log.e("PAGED RESULT", queryAlbums);
JSONObject JOTemp = new JSONObject(queryAlbums);
JSONArray JAPhotos = JOTemp.getJSONArray("data");
// IN MY CODE, I GET THE NEXT PAGE LINK HERE
getPhotos photos;
for (int i = 0; i < JAPhotos.length(); i++) {
JSONObject JOPhotos = JAPhotos.getJSONObject(i);
// Log.e("INDIVIDUAL ALBUMS", JOPhotos.toString());
if (JOPhotos.has("link")) {
photos = new getPhotos();
// GET THE ALBUM ID
if (JOPhotos.has("id")) {
photos.setPhotoID(JOPhotos.getString("id"));
} else {
photos.setPhotoID(null);
}
// GET THE ALBUM NAME
if (JOPhotos.has("name")) {
photos.setPhotoName(JOPhotos.getString("name"));
} else {
photos.setPhotoName(null);
}
// GET THE ALBUM COVER PHOTO
if (JOPhotos.has("picture")) {
photos.setPhotoPicture(JOPhotos
.getString("picture"));
} else {
photos.setPhotoPicture(null);
}
// GET THE ALBUM'S PHOTO COUNT
if (JOPhotos.has("source")) {
photos.setPhotoSource(JOPhotos
.getString("source"));
} else {
photos.setPhotoSource(null);
}
arrPhotos.add(photos);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// get listview current position - used to maintain scroll position
int currentPosition = gridOfPhotos.getFirstVisiblePosition();
// APPEND NEW DATA TO THE ARRAYLIST AND SET THE ADAPTER TO THE
// LISTVIEW
adapter = new PhotosAdapter(Photos.this, arrPhotos);
gridOfPhotos.setAdapter(adapter);
// Setting new scroll position
gridOfPhotos.setSelection(currentPosition + 1);
// SET LOADINGMORE "FALSE" AFTER ADDING NEW FEEDS TO THE EXISTING
// LIST
loadingMore = false;
}
}
这是从上述查询收集的帮助类SET和数据：GET
public class getPhotos {
String PhotoID;
String PhotoName;
String PhotoPicture;
String PhotoSource;
// SET THE PHOTO ID
public void setPhotoID(String PhotoID) {
this.PhotoID = PhotoID;
}
// GET THE PHOTO ID
public String getPhotoID() {
return PhotoID;
}
// SET THE PHOTO NAME
public void setPhotoName(String PhotoName) {
this.PhotoName = PhotoName;
}
// GET THE PHOTO NAME
public String getPhotoName() {
return PhotoName;
}
// SET THE PHOTO PICTURE
public void setPhotoPicture(String PhotoPicture) {
this.PhotoPicture = PhotoPicture;
}
// GET THE PHOTO PICTURE
public String getPhotoPicture() {
return PhotoPicture;
}
// SET THE PHOTO SOURCE
public void setPhotoSource(String PhotoSource) {
this.PhotoSource = PhotoSource;
}
// GET THE PHOTO SOURCE
public String getPhotoSource() {
return PhotoSource;
}
}
如果你也想要adapter代码，请告诉我。我在适配器中使用Fedor 的 延迟加载方法。
呸。希望这对您有所帮助。如果您还有其他问题，请随时提问。:-)
编辑：适配器代码添加：
public class PhotosAdapter extends BaseAdapter {
private Activity activity;
ArrayList<getPhotos> arrayPhotos;
private static LayoutInflater inflater = null;
ImageLoader imageLoader;
public PhotosAdapter(Activity a, ArrayList<getPhotos> arrPhotos) {
activity = a;
arrayPhotos = arrPhotos;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader = new ImageLoader(activity.getApplicationContext());
}
public int getCount() {
return arrayPhotos.size();
}
public Object getItem(int position) {
return arrayPhotos.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
View vi = convertView;
if(convertView == null) {
vi = inflater.inflate(R.layout.photos_item, null);
holder = new ViewHolder();
holder.imgPhoto = (ImageView)vi.findViewById(R.id.grid_item_image);
vi.setTag(holder);
} else {
holder = (ViewHolder) vi.getTag();
}
if (arrayPhotos.get(position).getPhotoPicture() != null){
imageLoader.DisplayImage(arrayPhotos.get(position).getPhotoPicture(), holder.imgPhoto);
}
return vi;
}
static class ViewHolder {
ImageView imgPhoto;
}
}
编辑：添加了加载时显示进度的步骤：
将 ProgressBar 添加到您的 XML 中，您在其下方有 GridView。如果它引起任何问题，请使用重量。
<LinearLayout
android:id="@+id/linlaProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<ProgressBar
style="@style/Spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2dp" />
</LinearLayout>
在您的 Java 中，将 声明Linearlayout linlaProgressBar为 Global 并将其转换为onCreate()并将其可见性设置为linlaProgressBar.setVisibility(View.GONE);
在onPreExecute()使用中是这样的：
@Override
protected void onPreExecute() {
// SHOW THE BOTTOM PROGRESS BAR (SPINNER) WHILE LOADING MORE PHOTOS
linlaProgressBar.setVisibility(View.VISIBLE);
}
最后添加，这个在onPostExecute()
// HIDE THE BOTTOM PROGRESS BAR (SPINNER) AFTER LOADING MORE ALBUMS
linlaProgressBar.setVisibility(View.GONE);