从Flickr JSON获取图像URL
[英]Get Image URLs from Flickr JSON
问题描述
我无法通过Flickr API获取图像的URL。 我正在为Instagram做类似的事情，并且正在工作，但是当我的Flickr活动加载时，什么都没有显示。 已加载JSON，但问题似乎出在获取图像的URL上。 知道我在做什么错吗？
public class FlickrActivity extends BaseActivity {
public static GridView gridView;
public static GridViewAdapter gridViewAdapter;
static String url;
static ArrayList<String> picURLS;
static Context context;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_grid);
gridView = (GridView)findViewById(R.id.imageGrid);
gridViewAdapter = new GridViewAdapter(this);
// gridView.setAdapter(gridViewAdapter);
context = getApplicationContext();
getActionBar().setTitle("Flickr");
url = "https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=API KEY&per_page=50&user_id=52540720@N02&format=json&nojsoncallback=1";
picURLS = new ArrayList<String>();
new ParseJSON().execute();
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(FlickrActivity.this, ImageActivity.class);
intent.putExtra("position", position);
startActivity(intent);
}
});
}
public static class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser()
{
}
public JSONObject getJSONFromUrl(String jsonUrl)
{
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(jsonUrl);
String responseBody = "DEFAULT_MSG_TEXT";
int resCode = 0;
try{
HttpResponse response = client.execute(get);
int responseCode = response.getStatusLine().getStatusCode();
resCode = responseCode;
switch(responseCode) {
case 200:
HttpEntity entity = response.getEntity();
if(entity != null) {
responseBody = EntityUtils.toString(entity);
}
break;
}
}
catch(Exception ex){
Log.e("Post Error",resCode + "\n Exception" + ex);
responseBody = "DEFAULT_MSG_TEXT";
}
json = responseBody;
// try to parse the string to a JSON object
try
{
jObj = new JSONObject(json);
}
catch (JSONException e)
{
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
public static class ParseJSON extends AsyncTask<Void,Void,ArrayList> {
@Override
protected void onPreExecute()
{
// TODO Auto-generated method stub
super.onPreExecute();
}
@Override
protected ArrayList doInBackground(Void... params) {
JSONParser jParser = new JSONParser();
// get json from url here
JSONObject json = jParser.getJSONFromUrl(url);
System.out.println("JSON: " + json);
try {
// JSONArray dataArray = json.getJSONArray("photo");
JSONObject photos = json.getJSONObject("photos");
JSONArray dataArray = photos.getJSONArray("photo");
int thumbnailsCount = dataArray.length();
for (int i = 0; i < thumbnailsCount; i++) {
JSONObject farm = dataArray.getJSONObject(i).getJSONObject("farm");
JSONObject server = dataArray.getJSONObject(i).getJSONObject("server");
JSONObject id = dataArray.getJSONObject(i).getJSONObject("id");
JSONObject secret = dataArray.getJSONObject(i).getJSONObject("secret");
String picURL = String.format("http://farm%s.static.flickr.com/%s/%s_%s_b.jpg", farm, server, id, secret);
System.out.println(picURL);
picURLS.add(picURL);
}
}
catch (Exception e) {
e.getMessage().toString();
}
return picURLS;
}
@Override
protected void onPostExecute(ArrayList result) {
super.onPostExecute(result);
gridView.setAdapter(gridViewAdapter);
for (String thumb : picURLS) {
System.out.println(thumb);
}
}
}
public class GridViewAdapter extends ArrayAdapter {
Context context;
public GridViewAdapter(Context context) {
super(context, 0);
this.context = context;
}
public int getCount() {
return picURLS.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ViewHolder holder;
if(row == null) {
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(R.layout.grid_row, parent, false);
holder = new ViewHolder();
holder.imageView = (ImageView)row.findViewById(R.id.gridImageView);
// ImageView gridImageView = (ImageView)row.findViewById(R.id.gridImageView);
row.setTag(holder);
}
else {
holder = (ViewHolder) row.getTag();
}
Picasso.with(context)
.load(picURLS.get(position))
.placeholder(R.drawable.placeholder)
.error(R.drawable.placeholder)
.into(holder.imageView);
return row;
}
}
static class ViewHolder {
ImageView imageView;
}
}
这是JSON：
{"photos":{"page":1,"pages":254,"perpage":50,"total":"12665","photo":[{"id":"15355145634","owner":"52540720@N02","secret":"a142bd54b5","server":"8580","farm":9,"title":"christmas-scott","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15356461163","owner":"52540720@N02","secret":"8508527108","server":"8623","farm":9,"title":"Jackson Tolle","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774323510","owner":"52540720@N02","secret":"1a69e1bfa6","server":"7476","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15935827796","owner":"52540720@N02","secret":"f2925ac043","server":"8650","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774324280","owner":"52540720@N02","secret":"48fc882459","server":"8639","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775880047","owner":"52540720@N02","secret":"81ec9b78ab","server":"7485","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775585989","owner":"52540720@N02","secret":"c5eca94b67","server":"8639","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15961599425","owner":"52540720@N02","secret":"87093030fd","server":"8627","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774200278","owner":"52540720@N02","secret":"74ed5b5bda","server":"7554","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775880667","owner":"52540720@N02","secret":"e4a2105e0e","server":"7560","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339327134","owner":"52540720@N02","secret":"7545e69058","server":"7505","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774325070","owner":"52540720@N02","secret":"d84e6cd95a","server":"8680","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341979093","owner":"52540720@N02","secret":"a30e8f10c6","server":"7541","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15961598125","owner":"52540720@N02","secret":"53ceb7f600","server":"8591","farm":9,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775881157","owner":"52540720@N02","secret":"ddd1bf3ab5","server":"7501","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15959628961","owner":"52540720@N02","secret":"45daeb449f","server":"7557","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960946592","owner":"52540720@N02","secret":"dea17cf59e","server":"7583","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15961604775","owner":"52540720@N02","secret":"95eb392b5b","server":"7480","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775590449","owner":"52540720@N02","secret":"bb419500e6","server":"7557","farm":8,"title":"2013-14 LEAD graduating class","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341959493","owner":"52540720@N02","secret":"e1af801876","server":"7492","farm":8,"title":"Mr. Melton introduces Mr. Haney at General Session","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960927522","owner":"52540720@N02","secret":"afaa266aa9","server":"7563","farm":8,"title":"Mr. Haney Mr. Beck Mr. Melton","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339308454","owner":"52540720@N02","secret":"91ec731e93","server":"7506","farm":8,"title":"Mr. Haney - General Session","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341959853","owner":"52540720@N02","secret":"2e06aa9460","server":"7565","farm":8,"title":"General Session - Mr. Haney","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774182448","owner":"52540720@N02","secret":"15aae90810","server":"7544","farm":8,"title":"FFCLA Pres","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775862227","owner":"52540720@N02","secret":"03c0f94763","server":"8569","farm":9,"title":"FFA President","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774307010","owner":"52540720@N02","secret":"f7acc992d6","server":"7520","farm":8,"title":"Carl Hurley - humorist","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774065278","owner":"52540720@N02","secret":"3b95230951","server":"7515","farm":8,"title":"2014 \"Top County\" - Butler County Farm Bureau","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341787543","owner":"52540720@N02","secret":"5688437582","server":"7499","farm":8,"title":"230","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341789423","owner":"52540720@N02","secret":"e15292294c","server":"7574","farm":8,"title":"229","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774134430","owner":"52540720@N02","secret":"de2435b657","server":"7530","farm":8,"title":"228","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960758462","owner":"52540720@N02","secret":"283dce0a2d","server":"8586","farm":9,"title":"227","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15961411555","owner":"52540720@N02","secret":"6b69560354","server":"7576","farm":8,"title":"226","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339139634","owner":"52540720@N02","secret":"50b0106bea","server":"7558","farm":8,"title":"225","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339140194","owner":"52540720@N02","secret":"939177dfba","server":"7581","farm":8,"title":"224","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775402169","owner":"52540720@N02","secret":"b0efef29bf","server":"8673","farm":9,"title":"223","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15341794043","owner":"52540720@N02","secret":"612e340f7c","server":"7504","farm":8,"title":"222","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960762422","owner":"52540720@N02","secret":"ac059f3245","server":"7525","farm":8,"title":"221","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15959446971","owner":"52540720@N02","secret":"58a59d06d8","server":"7574","farm":8,"title":"220","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960763572","owner":"52540720@N02","secret":"114120a5be","server":"7581","farm":8,"title":"219","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774141340","owner":"52540720@N02","secret":"93a6471dd7","server":"7482","farm":8,"title":"218","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15961417175","owner":"52540720@N02","secret":"e6ed2869d0","server":"7509","farm":8,"title":"217","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15935642466","owner":"52540720@N02","secret":"3399f43c92","server":"7514","farm":8,"title":"216","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15775407129","owner":"52540720@N02","secret":"887382ab10","server":"7581","farm":8,"title":"215","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15960766212","owner":"52540720@N02","secret":"c7e230b59a","server":"8633","farm":9,"title":"214","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774144000","owner":"52540720@N02","secret":"2bd9723772","server":"7557","farm":8,"title":"213","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15959451401","owner":"52540720@N02","secret":"836b23ea2b","server":"8567","farm":9,"title":"212","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15774145230","owner":"52540720@N02","secret":"bb08df2de2","server":"7530","farm":8,"title":"211","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339149004","owner":"52540720@N02","secret":"baf8e95075","server":"7512","farm":8,"title":"210","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15339149524","owner":"52540720@N02","secret":"9b8eddb494","server":"8591","farm":9,"title":"209","ispublic":1,"isfriend":0,"isfamily":0},{"id":"15935647536","owner":"52540720@N02","secret":"00aa323a5a","server":"7515","farm":8,"title":"208","ispublic":1,"isfriend":0,"isfamily":0}]},"stat":"ok"}
看来我没有让服务器场，服务器，ID和密码构成每个URL，这解释了为什么没有图像出现。 拿到那些我在做什么错？
2 个解决方案
解决方案1
0 2014-12-09 20:34:58
服务器场，服务器，ID和机密不应为JSONObjects。 它们应该是字符串，所以应该是String farm = dataArray.getJSONObject(i).getString("farm");
解决方案2
0 2014-12-17 20:51:12
您将获得服务器场，服务器，ID和机密信息，但它们位于第三级。 您需要查看照片>照片>服务器场（或服务器，ID等）。 一旦有了这些数据，就可以创建URL。 查看Flickr的此页面以获取更多详细信息。
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