從Android上的Facebook獲取封面圖片

Question

我正在尋找如何使用Facebook SDK從Facebook封面圖片。 我認爲這是使用JSON方法，但我真的不知道該怎麼做。

我嘗試使用

JSONObject jsonObject = user.getInnerJSONObject(); 

這

URL url = new URL(my_url); 
JSONObject obj = url.getContent(); 

我拿到了個人資料相片，但現在我需要讓蓋照片。

Answer 1

對於請求：

https://graph.facebook.com/me?fields=cover&access_token=YOUR_TOKEN

JSON響應：

{ 
    "cover": { 
    "id": "XXXXXXXXX", 
    "source": "URL_OF_COVER_PHOTO_IMAGE", 
    "offset_y": 50 
    }, 
    "id": "XXXXXXXXX" 
} 

希望它可以幫助你

要解析爲JSON內容使用這個類：

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.util.Log; 

public class JSONParser { 

static InputStream is = null; 
static JSONObject jObj = null; 
static String json = ""; 

// constructor 
public JSONParser() { 

} 

public JSONObject getJSONFromUrl(String url, ArrayList<NameValuePair> postParameters) { 

    // Making HTTP request 
    try { 
     // defaultHttpClient 
     DefaultHttpClient httpClient = new DefaultHttpClient(); 
     HttpPost httpPost = new HttpPost(url); 

     //add parameters to the post request 

     httpPost.setHeader("Content-type", "application/json;charset=utf8"); 
     HttpResponse httpResponse = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpResponse.getEntity(); 

     is = httpEntity.getContent(); 

    } catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    try { 
     BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8); 
     StringBuilder sb = new StringBuilder(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sb.append(line + "\n"); 
     } 
     is.close(); 
     json = sb.toString(); 
    } catch (Exception e) { 
     Log.e("Buffer Error", "Error converting result " + e.toString()); 
    } 

    // try 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; 

} 

然後，您將以JSON字符串形式顯示響應。使用JSONObject，你將只能得到你想要的字段（帶有封面url的字段）。一旦你的鏈接，只需從網址下載位圖並顯示它。