我使用Fat secret API在android中开发应用程序。现在我正在研究一个示例应用程序;它只搜索在EditText中输入的食物项目。我已阅读其Rest API文档here。
我按照他们的要求做了一切，但是，我仍然收到无效的OAUTH_SIGNATURE错误。我写了以下代码：
package com.example.foodsearch;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
HttpClient client;
EditText searchText;
Button searchButton;
String q="";
String encoder="";
String signatureString="";
String encodedSignString="";
String finalSignatureString="";
String key="";
String hmacKey="";
JSONObject json;
final static String URL="http://platform.fatsecret.com/rest/server.api";
final static String SIGN="a=foo&oauth_consumer_key=demo&oauth_nonce=abc&oauth_signature_method=HMAC-SHA1&oauth_timestamp=12345678&oauth_version=1.0&z=bar";
final static String OAUTH_CONSUMER_KEY="667d50884ae7446e8d08c283bdf3feff";
final static String OAUTH_ACCESS_SECRET="22dbde088c634f0f99d29fc468bf70c6";
final static String OAUTH_SIGNATURE_METHOD="HMAC-SHA1";
final static String OAUTH_VERSION="1.0";
final static String ENCODED_SIGN_STRING="a%3Dbar%26%26oauth_consumer_key%3Ddemo%26oauth_nonce%3Dabc%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D12345678%26oauth_version%3D1.0%26z%3Dbar";
static String OAUTH_TIMESTAMP="";
static String OAUTH_NOUNCE="shreyas";
final static String a="foo";
final static String z="bar";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialize();
}
public void initialize() {
// TODO Auto-generated method stub
searchText=(EditText)findViewById(R.id.etSearch);
searchButton=(Button)findViewById(R.id.bSearch);
client=new DefaultHttpClient();
long timestamp=(System.currentTimeMillis() / 1000);
OAUTH_TIMESTAMP=timestamp+"";
OAUTH_NOUNCE += timestamp;
Log.d("TIMESTAMP:", OAUTH_TIMESTAMP);
try {
encoder=URLEncoder.encode(URL, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("URL ENCODED:", encoder);
Map<String, String> params=new HashMap<String, String>();
params.put("oauth_consumer_key", OAUTH_CONSUMER_KEY);
params.put("oauth_signature_method", OAUTH_SIGNATURE_METHOD);
params.put("oauth_timestamp", OAUTH_TIMESTAMP);
params.put("oauth_nounce", OAUTH_NOUNCE);
params.put("oauth_version", OAUTH_VERSION);
// params.put("a", a);
// params.put("z", z);
Map<String, String> sortedMap=new TreeMap<String, String>(params);
printMap(sortedMap);
String sigString=concatenate(sortedMap);
Log.d("CONCATENATED STRING:", sigString);
encodedSignString=encodeSignatureString(sigString);
Log.d("ORIGINAL ENCODED STRING:", ENCODED_SIGN_STRING);
Log.d("MY ENCODED STRING:", encodedSignString);
finalSignatureString="GET" + "&" + encoder + "&" + encodedSignString;
Log.d("FINAL SIGN STRING:", finalSignatureString);
key=OAUTH_CONSUMER_KEY + "&" + OAUTH_ACCESS_SECRET;
hmacKey=computeHmac("HmacSHA1",finalSignatureString,key);
// hmacKey=encodeBase(hmacKey);
try{
hmacKey=URLEncoder.encode(hmacKey, "UTF-8");
}
catch (Exception e) {
e.printStackTrace();
}
Log.d("HMAC KEY:", hmacKey);
Log.d("DONE:", "Done with initialisaton");
searchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
q=searchText.getText().toString();
searchFood(q);
}
});
}
private String encodeBase(String hmacKey2) {
// TODO Auto-generated method stub
byte[] data=null;
try {
data=hmacKey2.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO: handle exception
e.printStackTrace();
}
String base64=Base64.encodeToString(data, Base64.DEFAULT);
Log.d("Base 64", base64);
return base64;
}
private String computeHmac(String type, String value, String key) {
// TODO Auto-generated method stub
try{
Mac mac=Mac.getInstance(type);
SecretKeySpec secret=new SecretKeySpec(key.getBytes(), type);
mac.init(secret);
byte[] bytes = mac.doFinal(value.getBytes());
return new String(Base64.encode(bytes,0));
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return "";
}
private String encodeSignatureString(String sigString) {
// TODO Auto-generated method stub
String encodedSignString="";
try {
encodedSignString=URLEncoder.encode(sigString, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return encodedSignString;
}
private String concatenate(Map<String, String> sortedMap) {
// TODO Auto-generated method stub
String signatureString="";
Set s=sortedMap.entrySet();
Iterator i=s.iterator();
while (i.hasNext()) {
Map.Entry entry = (Map.Entry) i.next();
String key=(String)entry.getKey();
String val=(String)entry.getValue();
signatureString+=key + "=" + val +"&";
}
return signatureString.substring(0, (signatureString.length()-1));
}
private void printMap(Map<String, String> sortedMap) {
// TODO Auto-generated method stub
Set s=sortedMap.entrySet();
Iterator i=s.iterator();
while (i.hasNext()) {
Map.Entry entry = (Map.Entry) i.next();
String key=(String)entry.getKey();
String val=(String)entry.getValue();
Log.d("SORTED :", key + "=" + val);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void searchFood(String q) {
final String searchKeyword=q;
AsyncTask<String, Integer, String> myAsyncTask = new AsyncTask<String, Integer, String>()
{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try{
String requestString=URL + "?search_expression=" +searchKeyword + "&format=json" + "&" + "oauth_consumer_key="+OAUTH_CONSUMER_KEY + "&" + "oauth_signature_method="+OAUTH_SIGNATURE_METHOD + "&" + "oauth_timestamp="+Long.parseLong(OAUTH_TIMESTAMP) + "&" + "oauth_nonce="+OAUTH_NOUNCE + "&" + "oauth_version="+OAUTH_VERSION + "&" + "oauth_signature="+hmacKey + "&" + "method=foods.search";
java.net.URL url=new java.net.URL(requestString);
Log.d("FINAL REQUEST STRING:", requestString);
StringBuilder sb=new StringBuilder(requestString);
StringBuilder foodRequest=new StringBuilder();
HttpGet get=new HttpGet(url.toString());
HttpResponse r= client.execute(get);
Log.d("EXECUTED:", "Executed post successfully!");
int status=r.getStatusLine().getStatusCode();
Log.d("STATUS:", status+"");
if(status >= 200 && status < 300)
{
BufferedReader br=new BufferedReader(new InputStreamReader(r.getEntity().getContent()));
String t;
while((t = br.readLine())!=null)
{
foodRequest.append(t);
}
Log.d("", foodRequest.toString());
json=new JSONObject(foodRequest.toString());
Log.d("GOT:", "GOT JSON OBJECT");
}
}
catch (JSONException e) {
// TODO: handle exception
Log.e("ERROR:", "This is not a valid JSON request");
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}
};
myAsyncTask.execute();
}
}
任何帮助将不胜感激..