我正在尝试使用 android 中的 facebook SDK 做一些相当简单的事情：
- 首先让用户登录
- 然后向用户询问其新闻源的读取权限
我有以下代码来执行此操作：
FacebookAlertActivity(Activity activity, Context context) {
this.activity = activity;
this.context = context;
// start Facebook Login
Session.openActiveSession(activity, true, new Session.StatusCallback() {
// callback when session changes state
@Override
public void call(Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
// make request to the /me API
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
// callback after Graph API response with user object
@Override
public void onCompleted(GraphUser user, Response response) {
if (user != null) {
//TextView welcome = (TextView) findViewById(R.id.welcome);
//welcome.setText("Hello " + user.getName() + "!");
}
}
});
}
}
});
// pull from news feed
Bundle params = new Bundle();
params.putString("q", FQL_QUERY);
Session session = Session.getActiveSession();
// get permissions to read user's facebook feed
requestReadPermissions(session);
requestReadPermissions looks like this:
private void requestReadPermissions(Session session) {
if (session != null) {
Session.NewPermissionsRequest newPermissionsRequest =
new Session.NewPermissionsRequest(activity, PERMISSIONS).
setRequestCode(REAUTH_ACTIVITY_CODE);
session.requestNewPublishPermissions(newPermissionsRequest);
}
}
当我尝试 requestReadPermissions() 时，我收到以下错误消息：
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.alarmclock/com.example.alarmclock.AlarmHandler}:
java.lang.UnsupportedOperationException: Session: an attempt was made
to request new permissions for a session that has a pending request.
有关如何解决此错误的任何想法？
完整代码：FacebookTestActivity.java
package com.example.alarmclock;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import com.facebook.*;
import com.facebook.android.Facebook;
import com.facebook.model.*;
import android.widget.TextView;
import android.content.Intent;
import java.util.*;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.locks.ReentrantLock;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class FacebookTestActivity extends Activity {
public ArrayList<fbPost> newsFeed = new ArrayList<fbPost>();
// Activity code to flag an incoming activity result is due
// to a new permissions request
private static final int REAUTH_ACTIVITY_CODE = 100;
// Indicates an on-going reauthorization request
private boolean pendingAnnounce;
// Key used in storing the pendingAnnounce flag
private static final String PENDING_ANNOUNCE_KEY = "pendingAnnounce";
/// List of additional write permissions being requested
private static final List<String> PERMISSIONS = Arrays.asList("read_stream");
private static final String FQL_QUERY = "SELECT message, comments, " +
"source_id, actor_id, attachment FROM stream WHERE filter_key IN (SELECT filter_key FROM " +
"stream_filter WHERE uid=me() AND type='newsfeed')";
private static final String FQL_ID_TO_NAME_QUERY = "SELECT name FROM user WHERE uid = ";
private final ReentrantLock lock = new ReentrantLock();
public String nameFromID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_facebook_alert);
// start Facebook Login
Session.openActiveSession(this, true, new Session.StatusCallback() {
// callback when session changes state
@Override
public void call(Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
// make request to the /me API
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
// callback after Graph API response with user object
@Override
public void onCompleted(GraphUser user, Response response) {
if (user != null) {
TextView welcome = (TextView) findViewById(R.id.welcome);
welcome.setText("Hello " + user.getName() + "!");
}
}
});
}
}
});
// pull from news feed
Bundle params = new Bundle();
params.putString("q", FQL_QUERY);
Session session = Session.getActiveSession();
// get permissions to read user's facebook feed
requestReadPermissions(session);
// apparently a bad practice...
sketchyCode();
Request request = new Request(session,
"/fql",
params,
HttpMethod.GET,
new Request.Callback(){
public void onCompleted(Response response) {
//response.getClass();
GraphObject feed = response.getGraphObject();
if (feed != null){
JSONObject jsonObject = feed.getInnerJSONObject();
JSONArray arr;
try {
arr = jsonObject.getJSONArray("data");
String s = Integer.toString(newsFeed.size());
Log.d("fbPost::onCompleted", s);
for (int i = 0; i < arr.length(); i++) {
JSONObject object = (JSONObject) arr.get(i);
test(translateJSONToPost(object));
newsFeed.add(translateJSONToPost(object));
Log.d("TAG", "message = "+object.get("message"));
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("TAG", "Result: " + response.toString());
}
}
});
Request.executeBatchAndWait(request);
String s = Integer.toString(newsFeed.size());
Log.d("fbPost::after", s);
s = Integer.toString(newsFeed.size());
Log.d("fbPost", s);
for (int i=0; i<newsFeed.size(); i++){
newsFeed.get(i).print();
}
}
public void onClick(View v){
String s = Integer.toString(newsFeed.size());
Log.d("onClick::fbPost", s);
for (int i=0; i<newsFeed.size(); i++){
newsFeed.get(i).print();
}
}
public void test(fbPost post){
String s = Integer.toString(newsFeed.size());
newsFeed.add(post);
s = Integer.toString(newsFeed.size());
Log.d("test(): fbPost", s);
}
private fbPost translateJSONToPost(JSONObject object) throws JSONException {
fbPost post;
JSONObject attach;
String actor_id;
String actor_name;
String source_id;
String source_name;
actor_id = object.getString("actor_id");
source_id = object.getString("source_id");
actor_name = getNameFromID(actor_id);
source_name = getNameFromID(source_id);
// before processing the update as a regular status update,
// try to read it in as a Youtube link or a regular link
try {
attach = object.getJSONObject("attachment");
JSONArray media = attach.getJSONArray("media");
Log.d("2TAG", media.toString());
if (media.toString().equals("[]")){
//Log.d("2TAG", "i failed you (media)");
post = new linkPost(attach.getString("description"), actor_name, source_name);
return post;
}
post = new videoLinkPost(attach.getString("description"), attach.getString("href"), actor_name, source_name);
return post;
//linkPost thing = (linkPost) post;
//Log.d("2TAG", "message: " + post.message + " URL: " + thing.linkURL );
} catch (JSONException e) {
// Means we were NOT able to retrieve an attachment from the post (indicating it
// is a regular status update)!
//Log.d("2TAG", "i failed you");
e.printStackTrace();
}
// now that we know its not a link, then we can treat it as a regular post
try {
post = new statusPost(object.getString("message"), actor_name, source_name);
return post;
} catch (JSONException e) {
Log.d("2TAG", "this type of post is not supported by our processing engine yet.");
return null;
}
}
private String getNameFromID(String id){
sketchyCode();
Bundle params = new Bundle();
params.putString("q", FQL_ID_TO_NAME_QUERY + id);
Session session = Session.getActiveSession();
Request request = new Request(session,
"/fql",
params,
HttpMethod.GET,
new Request.Callback(){
public void onCompleted(Response response) {
GraphObject data = response.getGraphObject();
if (data != null){
JSONObject jsonObject = data.getInnerJSONObject();
JSONArray arr;
try {
arr = jsonObject.getJSONArray("data");
JSONObject user = (JSONObject) arr.get(0);
nameFromID = user.getString("name");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Log.i("TAG", "Result: " + response.toString());
}
});
Request.executeBatchAndWait(request);
return nameFromID;
}
private void requestReadPermissions(Session session) {
if (session != null) {
Session.NewPermissionsRequest newPermissionsRequest =
new Session.NewPermissionsRequest(this, PERMISSIONS).
setRequestCode(REAUTH_ACTIVITY_CODE);
session.requestNewPublishPermissions(newPermissionsRequest);
}
}
// to allow for non-asynchronous calls to Facebook batch handling methods
private void sketchyCode(){
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_facebook_alert, menu);
return true;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}
}
完整代码：activity_facebook_alert.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".FacebookAlertActivity" >
<TextView
android:id="@+id/welcome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="facebook"
android:onClick="onClick"
android:clickable="true"/>
</RelativeLayout>