I have a strange situation.I am trying to integrate facebook with my app.But the login and post to wall works only for the first time.I am struck for the past 2 days and could not find a solution.
Here is the code snippet:
//.............Facebook..........................
private static final String APP_ID = "My app id";
// Instance of Facebook Class
private Facebook facebook = new Facebook(APP_ID);
private AsyncFacebookRunner mAsyncRunner;
private SharedPreferences mPrefs;
String access_token;
long expires;
//............Facebook..............................//
else if(actionId == ID_FACEBOOK)
{
mAsyncRunner = new AsyncFacebookRunner(facebook);
filename=myList.get(posglobal).get("foldername");
mPrefs = getPreferences(MODE_PRIVATE);
access_token = mPrefs.getString("access_token", null);
expires = mPrefs.getLong("access_expires", 0);
if (access_token != null) {
facebook.setAccessToken(access_token);
Log.d("FB Sessions", "" + facebook.isSessionValid());
}
if (expires != 0) {
facebook.setAccessExpires(expires);
}
if (!facebook.isSessionValid()) {
facebook.authorize(BoonDriveActivity.this,
new String[] { "email", "publish_stream" },
new DialogListener() {
@Override
public void onCancel() {
// Function to handle cancel event
}
@Override
public void onComplete(Bundle values) {
// Function to handle complete event
// Edit Preferences and update facebook acess_token
final SharedPreferences.Editor editor = mPrefs.edit();
editor.putString("access_token",
facebook.getAccessToken());
editor.putLong("access_expires",
facebook.getAccessExpires());
editor.commit();
LayoutInflater inflater=BoonDriveActivity.this.getLayoutInflater();
View layout=inflater.inflate(R.layout.createsharedialoglinkedin,null);
final AlertDialog d1 = new AlertDialog.Builder(BoonDriveActivity.this)
// Your other options here ...
.setView(layout)
.create();
d1.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
d1.show();
lntxtfilename=(TextView)layout.findViewById(R.id.txtfilename);
lnetmessage=(EditText)layout.findViewById(R.id.et_message);
ln_btn_share=(Button)layout.findViewById(R.id.btn_share);
ln_btn_showlink=(Button)layout.findViewById(R.id.btn_showlink);
lnshowlink=(EditText)layout.findViewById(R.id.et_showlink);
lntxtfilename.setText("Share"+" "+filename+" "+"with:");
ln_btn_share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
postToWall();
}
});
}
@Override
public void onError(DialogError error) {
// Function to handle error
}
@Override
public void onFacebookError(FacebookError fberror) {
// Function to handle Facebook errors
}
});
}
}
I am inflating a customize view to post on the wall.For the first time the value of access_token is null and expires is zero.But when i try to share for the second time nothing happens.I debugged my application and find that now there is some value in access_token as well as expires and the condition if (!facebook.isSessionValid()) is not firing.Any help??I know I am using some deprecated method but I couldn't find updated tutorials or documentations.
Here is a code of post to wall:
/**
* Function to post to facebook wall
* */
@SuppressWarnings("deprecation")
public void postToWall() {
// post on user's wall.
facebook.dialog(this, "feed", new DialogListener() {
@Override
public void onFacebookError(FacebookError e) {
}
@Override
public void onError(DialogError e) {
}
@Override
public void onComplete(Bundle values) {
}
@Override
public void onCancel() {
}
});
}
Update:
I am using this code to generate hash:
// Add code to print out the key hash
try {
PackageInfo info = getPackageManager().getPackageInfo(
"com.india.webguru.bizboon",
PackageManager.GET_SIGNATURES);
for (Signature signature : info.signatures) {
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(signature.toByteArray());
Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
System.out.println("Facebook hash===>"+Base64.encodeToString(md.digest(), Base64.DEFAULT));
}
} catch (NameNotFoundException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
Same issue was solved by following steps:
METHOD 1
Goto Cmd : then C:\Program Files (x86)\Java\jdk1.7.0_02\bin (use your path)
1) Generate Debug key
keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64
3***W/****************= (require debug key)
2) Generate Hash Key
keytool -exportcert -alias 3***W/****************= -keystore "C:\Users\Smartphone Developer\.android\debug.keystore" | openssl sha1 -binary | openssl base64
*******+************= (require hash key)
Note: if hash key gives error, then copy paste the same hash generated by FaceBook in exception & add "=" in the end..
VALID HASH FOR FACEBOOK = ***************/a*0=
Edit: Download Openssl & place the folder like C:\OpenSSL
UPDATE 1 (step vise): After placing Openssl folder in C drive, open cmd & write commands:
METHOD 2
step 1
C:\Program Files\Java\jre7>bin
step 2
C:\Program Files\Java\jre7\bin>keytool -exportcert -alias androiddebugkey -keyst
ore "C:\Users\Smartphone Developer\.android\debug.keystore" | "C:\OpenSSL\bin\openssl" sha
1 -binary | "C:\OpenSSL\bin\openssl" base64
Enter keystore password: android
u***ZT***T***2t***bU*Fj***w=
step 3
C:\Program Files\Java\jre7\bin>keytool -exportcert -alias u***ZT***T***2t***bU*Fj***w=
-keystore "C:\Users\Smartphone Developer\.android\debug.keystore" | "C:\OpenSSL\bin
\openssl" sha1 -binary | "C:\OpenSSL\bin\openssl" base64
Enter keystore password: android
d*W+i***9/6vs***nP***CF***g= (Required Hash)
if you downloaded the correct openssl then it must work, its a tested procedure..
来源：https://stackoverflow.com/questions/25356984/facebook-login-and-post-to-wall-works-for-first-time-only