在我的应用程序中，我正在显示 facebook 墙流，我正在使用Facebook Graph API来获取每个帖子的数据。
有时当我快速滚动列表时，我会得到OutOfMemoryerror. 我真的不知道 facebook 应用程序使用什么技术来显示墙数据。
我可以知道他们使用的技术吗？
我以页面形式从 Facebook 获取数据。所以，我一次显示页面中的所有数据。正如我们在facebook 应用程序中看到的那样，我怎样才能只显示有限的数据？
class doInBack extends AsyncTask<URL, Integer, Long>
{
protected void onPreExecute()
{ if(boolDialog){
dialog=MyProgressDialog.show(Wall.this, null,null);
}
}
// currentweb= webserv;
@Override
protected Long doInBackground(URL... arg0) {
currentweb=webserv;
Log.e("hi","doback parsing");
try
{
wallres=UrltoValue.getValuefromUrl(currentweb);
Log.i("wallrespages",wallres);
JSONObject jobj1=new JSONObject(wallres);
JSONObject jobj2=jobj1.getJSONObject("paging");
webserv= jobj2.getString( "next");
jsonArray = jobj1.getJSONArray("data");
for(int i=0;i<jsonArray.length();i++){
jsonObject = jsonArray.getJSONObject(i);
if(jsonObject.has("message")||jsonObject.has("picture")) {
try{
// msg[j]=jsonObject.getString("message");
if(jsonObject.has("message"))
{
msg.add(jsonObject.getString("message"));
}
else{
msg.add("");
}
}
catch(Exception e){
e.printStackTrace();
}
try{
// msg[j]=jsonObject.getString("message");
if(jsonObject.has("picture"))
{
String firstpicture=jsonObject.getString("picture");
String secondpicture=firstpicture.replaceAll("_s.jpg", "_n.jpg");
Log.e("picurl",secondpicture);
pic.add(secondpicture);
}
else{
pic.add("");
}
}
catch(Exception e){
e.printStackTrace();
} objid.add(jsonObject.getString("id"));
JSONObject jobj=jsonObject.getJSONObject("from");
name.add(jobj.getString("name"));
id.add(jobj.getString("id"));
if(jsonObject.getString("type").equals("checkin")){
name.set(i,jobj.getString("name")+" "+"is at"+" "+jsonObject.getString("name"));
}
profimg.add("http://graph.facebook.com/"+id.get(j)+"/picture?type=square");
JSONObject commentjobj=jsonObject.getJSONObject("comments");
comment.add(commentjobj.getString("count"));
if(jsonObject.has("likes")) {
Log.e("likeornot","likre");
JSONObject likesjobj=jsonObject.getJSONObject("likes");
likes.add(likesjobj.getString("count"));
String postid=jsonObject.getString("id");
// graph_or_fql = "fql";
String query = "SELECT likes.user_likes FROM stream WHERE post_id = \'" + postid + "'";
// Log.d("finalThreadID", finalThreadID);
Bundle params = new Bundle();
params.putString("method", "fql.query");
params.putString("query", query);
// Utility.mAsyncRunner.request(null, params, new LikesListener());
String fqlResponse = Login.mFacebook.request(params);
System.out.println(fqlResponse);
JSONArray JOLikeresponse=new JSONArray(fqlResponse);
if(JOLikeresponse.length()!=0){
JSONObject JOLikeObject = JOLikeresponse.getJSONObject(0);
if ( JOLikeObject.has("likes")) {
String optlike,optlikesarray;
JSONObject optLikes=JOLikeObject;
JSONArray optLikesArray;
try{
optLikes = JOLikeObject.getJSONObject("likes");
optlike="like";
}
catch(Exception e){
optlike="unlike";
}
//
if(optlike.equals("like")){
if (optLikes.has("user_likes")) {
String getUserLikes = optLikes.getString("user_likes");
if (getUserLikes.equals("true")) {
like_or_unlike.add("Unlike");
} else if (getUserLikes.equals("false")) {
like_or_unlike.add("Like");
}
}
else {
like_or_unlike.add("Like");
}
} else {
like_or_unlike.add("Like");
}
}
//if likes object is not there in like response
else {
like_or_unlike.add("Like");
}
}
//if the like response Array length is zero
else {
like_or_unlike.add("Like");
}//FQL query object
}
//If likes are not there
else{
likes.add("0");
like_or_unlike.add("Like");
}
weburl.add(currentweb);
Log.e("comment", comment.get(j));
// bitmap[j]= getBitmapFromURL(profimg[j]);
// profimg1.setImageBitmap(bitmap[j]);
// imageLoader.DisplayImage( profimg[j].replace(" ", "%20"), profimg1) ;
// System.out.println( bitmap[j]);
// j++;
// f=j;
String getCreatedTime = jsonObject.getString("created_time");
// long finalTimeStamp = Long.valueOf(getCreatedTime);
// SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ssZ");
// String timestamp = dateFormatter.format(new Date(finalTimeStamp * 1000L));
SimpleDateFormat formatter = getDateFormat();
ParsePosition pos = new ParsePosition(0);
long then = formatter.parse(getCreatedTime, pos).getTime();
long now = new Date().getTime();
long seconds = (now - then)/1000;
long minutes = seconds/60;
long hours = minutes/60;
long days = hours/24;
String friendly = null;
long num = 0;
if (days > 0) {
num = days;
friendly = days + " day";
} else if (hours > 0) {
num = hours;
friendly = hours + " hour";
} else if (minutes > 0) {
num = minutes;
friendly = minutes + " minute";
} else if(seconds>0) {
num = seconds;
friendly = seconds + " second";
}
else{
friendly = "few seconds";
}
if (num > 1) {
friendly += "s";
}
String postTimeStamp = friendly.toLowerCase() + " ago";
Log.e("date",postTimeStamp );
date.add(postTimeStamp);
j++;
}
}
// if(jsonObject.getString("message")!=""){
// msg[i]=jsonObject.getString("message");
//
// JSONObject jobj=jsonObject.getJSONObject("from");
// name[i]= jobj.getString("name");
// id[i]=jobj.getString("id");
// Log.e("msg",msg[i]);
// Log.e("name",name[i]);
// Log.e("id",id[i]);
// }
//
// }
}
catch(Exception e)
{
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Long result) {
try
{ if(addFooter){
listView.addFooterView(footerView);
}
addFooter=false;
System.out.println(scroll);
if(scroll){
adapter=new MySimpleArrayAdapter(Wall.this,R.layout.wall,pic,name,msg,id,profimg,comment,objid,weburl,likes, like_or_unlike,date);
listView.setAdapter(adapter);
listView.postDelayed(new Runnable() {
// @Override
public void run() {
listView.onRefreshComplete();
}
}, 2000);
if(boolDialog){
dialog.dismiss();
}
}
else{
// adapter=new MySimpleArrayAdapter(Wall.this,R.layout.wall,pic,name,msg,id,profimg,bitmap,comment,objid,weburl);
adapter.notifyDataSetChanged();
listView.postDelayed(new Runnable() {
// @Override
public void run() {
listView.onRefreshComplete();
}
}, 2000);
}
if(boolDialog){
dialog.dismiss();
}
}
catch(Exception e)
{
e.printStackTrace();
if(boolDialog){
dialog.dismiss();
}
}
boolDialog=false;
}
}
private static SimpleDateFormat getDateFormat() {
return new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ssZ");
}