我创建了一个使用 facebook 登录和注销的简单应用程序。登录时没问题，但注销时应用程序已停止。有什么解决办法吗？
这是我的代码
Activity
public class Login extends Activity implements OnClickListener {
ImageView pic, button;
Facebook fb;
SharedPreferences sp;
TextView welcome;
@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
String APP_ID = getString(R.string.app_id);
fb = new Facebook(APP_ID);
sp = getPreferences(MODE_PRIVATE);
String access_token = sp.getString("access_token",null);
long expires = sp.getLong("access_expires", 0);
if(access_token != null){
fb.setAccessToken(access_token);
}
if(expires != 0){
fb.setAccessExpires(expires);
}
welcome = (TextView) findViewById(R.id.welcome);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
button = (ImageView)findViewById(R.id.login);
pic = (ImageView)findViewById(R.id.picture_pic);
button.setOnClickListener(this);
updateButtonImage();
}
@SuppressWarnings("deprecation")
private void updateButtonImage() {
if (fb.isSessionValid()){
button.setImageResource(R.drawable.logout_button);
pic.setVisibility(ImageView.VISIBLE);
JSONObject obj = null;
// URL img_url = null;
try {
String jsonUser = fb.request("me");
obj = Util.parseJson(jsonUser);
String id = obj.optString("id");
String name = obj.optString("name");
welcome.setText("Welcome, " + name + " Your id is " + id);
} catch (FacebookError e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
button.setImageResource(R.drawable.login_button);
pic.setVisibility(ImageView.INVISIBLE);
}
}
@SuppressWarnings("deprecation")
@Override
public void onClick(View v) {
// logout from facebook
if(fb.isSessionValid()){
try {
fb.logout(Login.this);
updateButtonImage();
welcome.setText("Please Login !");
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}else{
//login to facebook
fb.authorize(Login.this, new String[] {"email"} ,new DialogListener(){
@Override
public void onComplete(Bundle values) {
Editor editor = sp.edit();
editor.putString("access_token", fb.getAccessToken());
editor.putLong("access_expires", fb.getAccessExpires());
editor.commit();
updateButtonImage();
// Intent intent = new Intent (Login.this,Home.class);
// startActivity(intent);
// finish();
}
@Override
public void onFacebookError(FacebookError e) {
Toast.makeText(Login.this, "onFBError", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(DialogError e) {
Toast.makeText(Login.this, "onError", Toast.LENGTH_SHORT).show();
}
@Override
public void onCancel() {
Toast.makeText(Login.this, "onCancel", Toast.LENGTH_SHORT).show();
}
});
}
}
@SuppressWarnings("deprecation")
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
fb.authorizeCallback(requestCode, resultCode, data);
}
}
这是来自 Logcat 的错误报告
> 03-28 07:27:37.379: W/dalvikvm(4094): threadid=1: thread exiting with
> uncaught exception (group=0xa62df288) 03-28 07:27:37.383:
> E/AndroidRuntime(4094): FATAL EXCEPTION: main 03-28 07:27:37.383:
> E/AndroidRuntime(4094): java.lang.IllegalArgumentException: Invalid
> context argument 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> android.webkit.CookieSyncManager.createInstance(CookieSyncManager.java:86)
> 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> com.facebook.internal.Utility.clearCookiesForDomain(Utility.java:255)
> 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> com.facebook.internal.Utility.clearFacebookCookies(Utility.java:279)
> 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> com.facebook.Session.closeAndClearTokenInformation(Session.java:593)
> 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> com.facebook.android.Facebook.logoutImpl(Facebook.java:667) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> com.facebook.android.Facebook.logout(Facebook.java:644) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> com.innoark.motivator.Login.onClick(Login.java:118) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> android.view.View.performClick(View.java:4084) 03-28 07:27:37.383:
> E/AndroidRuntime(4094): at
> android.view.View$PerformClick.run(View.java:16966) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> android.os.Handler.handleCallback(Handler.java:615) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> android.os.Handler.dispatchMessage(Handler.java:92) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> android.os.Looper.loop(Looper.java:137) 03-28 07:27:37.383:
> E/AndroidRuntime(4094): at
> android.app.ActivityThread.main(ActivityThread.java:4745) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> java.lang.reflect.Method.invokeNative(Native Method) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> java.lang.reflect.Method.invoke(Method.java:511) 03-28 07:27:37.383:
> E/AndroidRuntime(4094): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
> 03-28 07:27:37.383: E/AndroidRuntime(4094): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 03-28
> 07:27:37.383: E/AndroidRuntime(4094): at
> dalvik.system.NativeStart.main(Native Method)
提前致谢。
最佳答案
我在一个旧应用程序中遇到了这个错误，该应用程序仍在使用这个问题中使用的现已弃用的注销方法。由于时间不够，我选择修补 SDK 以快速修复而不是升级。
如堆栈跟踪所示，问题在于在这一行，传递给 CookieSyncManager 的上下文参数为空:
android.webkit.CookieSyncManager.createInstance(CookieSyncManager.java:86)
再往上看，可以看到传入的Context参数是Facebook SDK中Session类的staticContext成员变量。无论出于何种原因，他们将此变量设置为 null，因此当调用 logout 时，应用程序会因此异常而崩溃。
为了解决这个问题，我刚刚编辑了 Session 类，使 initializeStaticContext 成为一个公共(public)方法。然后，在调用注销之前调用它:
Session.initializeStaticContext(this.getApplicationContext());
fb.logout(Login.this);
当然，这不是最好的解决方案，但它可以完成工作。
关于android - java.lang.IllegalArgumentException : Invalid context argument error when logout 异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15676622/