从Facebook登录然后退出会导致在尝试重新登录Android时崩溃

Question

我为我的应用程序添加了一个登录按钮，它工作正常，但我的问题是当我在下一个活动中添加注销按钮时，它正在注销，但是当我尝试再次登录时，我的应用程序崩溃了！

我用这段代码注销：LoginManager.getInstance().logOut();

以下是我登录的活动的 Java 代码：

public class ConnexionActivity extends AppCompatActivity {
Button b_bb, b_back, ee, b_inscrp_formulaire, fb;
EditText tb_pseudo, tb_mdp;
int id;
String name, gender, email, birthday;
private LoginButton loginButton;
private CallbackManager callbackManager;
Profile profile;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
/*List<String> permissionNeeds = Arrays.asList("user_photos", "email",
"user_birthday", "public_profile", "AccessToken");*/
setContentView(R.layout.activity_connexion);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle("");
setSupportActionBar(toolbar);
b_inscrp_formulaire = (Button) findViewById(R.id.b_inscrip_formulaire);

fb = (Button) findViewById(R.id.fb);

loginButton = (LoginButton) findViewById(R.id.login_button);
loginButton.setText("");
loginButton.setReadPermissions(Arrays.asList("public_profile", "email", "user_friends", "user_birthday"));
//"user_photos", "email","user_birthday", "public_profile"
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
graphRequest(loginResult.getAccessToken());

}
@Override
public void onCancel() {
Toast.makeText(getApplicationContext(), "Non-Connecté : connexion interrupu!!", Toast.LENGTH_LONG).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), "Non-Connecté : Erreur de connexion!!", Toast.LENGTH_LONG).show();
}

});


b_bb = (Button) findViewById(R.id.b_bb);
b_back = (Button) findViewById(R.id.b_back);
tb_pseudo = (EditText) findViewById(R.id.textbox_pseudo);
tb_mdp = (EditText) findViewById(R.id.textbox_mdp);

/////////////
ee = (Button) findViewById(R.id.button);
////////////
b_bb.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
b_bb.setBackgroundResource(R.drawable.button_bb_selec);
break;
}
case MotionEvent.ACTION_UP: {
b_bb.setBackgroundResource(R.drawable.button_bb);
break;
}
}
return false;
}
});
b_bb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

if (isAuthorized()) {
Intent menu_p = new Intent(ConnexionActivity.this, MenuPActivity.class);
menu_p.putExtra("pseudo", tb_pseudo.getText().toString());
startActivity(menu_p);
} else {
openDialog();
}
}
});

b_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ConnexionActivity.this.finish();
}
});

ee.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent menu_p = new Intent(ConnexionActivity.this, MenuPActivity.class);
menu_p.putExtra("pseudo", "Easter");
startActivity(menu_p);
}
});
b_inscrp_formulaire.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent menu_p = new Intent(ConnexionActivity.this, InscriptionActivity.class);
startActivity(menu_p);
}
});

LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
graphRequest(loginResult.getAccessToken());
Intent menu_p = new Intent(ConnexionActivity.this, MenuPActivity.class);
menu_p.putExtra("pseudo", profile.getFirstName());
startActivity(menu_p);
Toast.makeText(getApplicationContext(), "Connecté : " + profile.getFirstName() + " " + profile.getLastName(), Toast.LENGTH_LONG).show();
}
@Override
public void onCancel() {
Toast.makeText(getApplicationContext(), "Non-Connecté : connexion interrupu!!", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), "Non-Connecté : Erreur de connexion!!", Toast.LENGTH_SHORT).show();
}

});

fb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

LoginManager.getInstance().logInWithReadPermissions(ConnexionActivity.this,
Arrays.asList("public_profile","user_friends", "email"));
/*facebook permissions : "user_photos", "email", "user_birthday", "public_profile"*/
profile = Profile.getCurrentProfile().getCurrentProfile();
//to verify if a login happened or not!!
if (profile != null) {
// user has logged in
} else {
// user has not logged in
}

}
});

//To log out of FB:
/*LoginManager.getInstance().logOut();*/
//TODO: check if the user is logged in or not
/* profile = Profile.getCurrentProfile().getCurrentProfile();
if (profile != null) {
// user has logged in
} else {
// user has not logged in
}*/
}
private Boolean isAuthorized() {
if (tb_pseudo.getText().toString().equals("Admin")
&& tb_mdp.getText().toString().equals("0000")
) {
return true;
} else
return false;
}
public void openDialog() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Mauvaise combinaison "Pseudo", "Mot de passe"");
alertDialogBuilder.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
}
});

AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}

public void graphRequest(AccessToken token) {
GraphRequest request = GraphRequest.newMeRequest(token, new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject object, GraphResponse response) {
//showing infos about the connected client!!
//Toast.makeText(getApplicationContext(), object.toString(), Toast.LENGTH_LONG).show();
}
});
Bundle b = new Bundle();
b.putString("fields", "id,email,first_name,last_name,picture.type(large)");
request.setParameters(b);
request.executeAsync();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);

}
}

Answer 1

最后我得到了答案：

FacebookSdk.sdkInitialize(getApplicationContext());
callbackManager = CallbackManager.Factory.create();
fb = (Button) findViewById(R.id.fb);
loginButton.setReadPermissions(Arrays.asList("public_profile", "email", "user_friends", "user_birthday"));
//"user_photos", "email","user_birthday", "public_profile"
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
graphRequest(loginResult.getAccessToken());

}
@Override
public void onCancel() {
Toast.makeText(getApplicationContext(), "Non-Connecté : connexion interrupu!!", Toast.LENGTH_LONG).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), "Non-Connecté : Erreur de connexion!!", Toast.LENGTH_LONG).show();
}
});
LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
graphRequest(loginResult.getAccessToken());
Intent menu_p = new Intent(ConnexionActivity.this, MenuPActivity.class);
menu_p.putExtra("pseudo", profile.getFirstName());
startActivity(menu_p);
Toast.makeText(getApplicationContext(), "Connecté : " + profile.getFirstName() + " " + profile.getLastName(), Toast.LENGTH_LONG).show();
}
@Override
public void onCancel() {
Toast.makeText(getApplicationContext(), "Non-Connecté : connexion interrupu!!", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(getApplicationContext(), "Non-Connecté : Erreur de connexion!!", Toast.LENGTH_SHORT).show();
}
});
fb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

LoginManager.getInstance().logInWithReadPermissions(ConnexionActivity.this,
Arrays.asList("public_profile", "user_friends", "email"));
/*facebook permissions : "user_photos", "email", "user_birthday", "public_profile"*/
profile = Profile.getCurrentProfile().getCurrentProfile();
//to verify if a login happened or not!!
if (profile != null) {
// user has logged in
} else {
// user has not logged in
}
}
});