我成功地将Facebook api集成到我的第一个Android应用程序中，但是现在我在第一次成功登录后，仍然坚持使用access_token来避免我的应用程序中的Login步骤。我在登录后成功存储了token_access，但在重新启动应用后无法使用它。
App flow as：SplashScreen Activity - ＆gt; LoginRegister活动 - ＆gt; MainActivity
我的代码
SplashScreen活动类：
public class Splash_Screen extends Activity {
Login log;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash__screen);
Thread thread = new Thread() {
public void run() {
try {
sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
Class classs;
log=new Login();
if (log.get() == false)
classs = Login_Register.class;
else
classs = Main.class;
Intent intent = new Intent(Splash_Screen.this, classs);
intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(intent);
overridePendingTransition(0, 0);
}
}
};
thread.start();
}
}
登录类（Login是LloginRegister Activity类中的Fragment）：
public class Login extends Fragment implements
OnClickListener{
boolean me;
Facebook fb;
static String access_token;;
static SharedPreferences Logininfo;
static long expires;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View login = inflater.inflate(R.layout.login, container, false);
// TODO Auto-generated method stub
login.findViewById(R.id.Login).setOnClickListener(this);
login.findViewById(R.id.googlepluslog).setOnClickListener(this);
login.findViewById(R.id.facebooklog).setOnClickListener(this);
return login;
}
@SuppressWarnings("deprecation")
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
fb = new Facebook(getString(R.string.APP_ID));
}
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.Login:
if (UN.getText().length() == 0 || Pass.getText().length() == 0) {
Toast.makeText(getActivity(),
"Please enter valid Username and Password",
Toast.LENGTH_SHORT).show();
}
break;
case R.id.facebooklog:
me=true;
if (!fb.isSessionValid()) {
fb.authorize(getActivity(), new String[] { "email" },
new DialogListener() {
@Override
public void onFacebookError(FacebookError e) {
// TODO Auto-generated method stub
}
@Override
public void onError(DialogError e) {
// TODO Auto-generated method stub
}
@Override
public void onComplete(Bundle values) {
// TODO Auto-generated method stub
set();
Toast.makeText(getActivity(), "successful",
Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getActivity()
.getApplicationContext(), Main.class);
startActivity(intent);
}
@Override
public void onCancel() {
// TODO Auto-generated method stub
}
});
}
break;
case R.id.googlepluslog:
me=false;
break;
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(getActivity(), requestCode,
resultCode, data);
}
@SuppressWarnings("deprecation")
public void set() {
Logininfo = PreferenceManager.getDefaultSharedPreferences(getActivity()
.getApplicationContext());
// Logininfo = getSharedPreferences(MODE_PRIVATE);
Editor edit = Logininfo.edit();
edit.putString("access_token", fb.getAccessToken());
edit.putLong("access_expires", fb.getAccessExpires());
edit.commit();
}
@SuppressWarnings("deprecation")
public boolean get() {
boolean b = false;
Log.i("dfsafw", "22222");
SharedPreferences Logininfo = PreferenceManager
.getDefaultSharedPreferences(getActivity().getBaseContext());
Log.i("dfsafw", "11111");
access_token = Logininfo.getString("access_token", null);
expires = Logininfo.getLong("access_expires", 0);
if (access_token != null) {
fb.setAccessToken(access_token);
if (expires != 0)
fb.setAccessExpires(expires);
b = true;
}
return b;
}
}
我试图在Login类中定义的启动画面活动中检索访问令牌，并且我是android和java的初学者，我尝试了这种没有锻炼的方式。请帮帮我。
答案 0 :(得分：1)
假设您已经保存了偏好设置，您可以随时阅读这些偏好设置，如下所示。
在共享首选项文件上写：
SharedPreferences prefs = getSharedPreferences("your_file_name", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("yourStringName", "this_is_the_saved_value");
editor.commit(); // This line is IMPORTANT. If you miss this one its not going to work!
从共享首选项文件中读取：
SharedPreferences prefs = getSharedPreferences("your_file_name",MODE_PRIVATE);
String string = prefs.getString("yourStringName", "default_value_here_if_string_is_missing");
您可以使用默认文件来保存/阅读您的偏好设置。只需用以下内容替换上面两个代码段的第一行：SharedPreferences prefs = getDefaultSharedPreferences(getApplicationContext());