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我想使用解析Facebook登录功能，并开始通过引用this tutorial的解析Facebook集成。我使用的）一个LoginActivity将调用ParseFacebookUtils.logIn（权限，LoginActivity.this，新LogInCallback（但我收到以下异常java.lang.NullPointerException：参数'applicationId'不能为空 - 使用PARSE Facebook登录
02-07 14:22:16.485 29990-29990/prototype.quest.cashquest E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: prototype.quest.cashquest, PID: 29990
java.lang.NullPointerException: Argument 'applicationId' cannot be null
at com.facebook.internal.Validate.notNull(Validate.java:29)
at com.facebook.Session.<init>(Session.java:281)
at com.facebook.Session.<init>(Session.java:270)
at com.facebook.Session$Builder.build(Session.java:1822)
at com.parse.FacebookAuthenticationProvider.authenticate(FacebookAuthenticationProvider.java:116)
at com.parse.ParseUser.authenticateAsync(ParseUser.java:1500)
at com.parse.ParseUser.logInWithAsync(ParseUser.java:1520)
at com.parse.ParseUser.logInWithAsync(ParseUser.java:1309)
at com.parse.ParseFacebookUtils.logInInBackground(ParseFacebookUtils.java:478)
at com.parse.ParseFacebookUtils.logIn(ParseFacebookUtils.java:545)
at prototype.quest.cashquest.LoginActivity.onLoginClick(LoginActivity.java:143)
at prototype.quest.cashquest.LoginActivity$1.onClick(LoginActivity.java:117)
at android.view.View.performClick(View.java:4654)
at android.view.View$PerformClick.run(View.java:19438)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
这里是我的LoginActivity：
public class LoginActivity extends Activity {
private Dialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button login = (Button) findViewById(R.id.fb);
login.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
onLoginClick(v);
// Starts an intent for the sign up activity
}
});
// Check if there is a currently logged in user
// and it's linked to a Facebook account.
ParseUser currentUser = ParseUser.getCurrentUser();
if ((currentUser != null) && ParseFacebookUtils.isLinked(currentUser)) {
// Go to the user info activity
showUserDetailsActivity();
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
ParseFacebookUtils.finishAuthentication(requestCode, resultCode, data);
}
public void onLoginClick(View v) {
progressDialog = ProgressDialog.show(LoginActivity.this, "", "Logging in...", true);
List<String> permissions = Arrays.asList("public_profile");
ParseFacebookUtils.logIn(permissions, LoginActivity.this, new LogInCallback() {
@Override
public void done(ParseUser user, ParseException err) {
progressDialog.dismiss();
if (user == null) {
Log.d("Facebook_login", "Uh oh. The user cancelled the Facebook login.");
} else if (user.isNew()) {
Log.d("Facebook_login", "User signed up and logged in through Facebook!");
showUserDetailsActivity();
} else {
Log.d("Facebook_login", "User logged in through Facebook!");
showUserDetailsActivity();
}
}
});
}
private void showUserDetailsActivity() {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
}
这里所使用的登录活动我的main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:gravity="center"
android:text="@string/login"
android:textSize="18sp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="100dp"
android:id="@+id/fb"
android:text="@string/com_facebook_loginview_log_in_button"
android:textColor="@color/com_facebook_loginview_text_color"
android:textSize="@dimen/com_facebook_loginview_text_size"
android:textStyle="bold"
android:background="@drawable/com_facebook_button_blue"
android:drawableLeft="@drawable/com_facebook_inverse_icon"
android:drawablePadding="@dimen/com_facebook_likebutton_compound_drawable_padding"
android:paddingLeft="@dimen/com_facebook_loginview_padding_left"
android:paddingTop="@dimen/com_facebook_loginview_padding_top"
android:paddingRight="@dimen/com_facebook_loginview_padding_right"
android:paddingBottom="@dimen/com_facebook_loginview_padding_bottom"
android:onClick="onLoginClick"/>
</LinearLayout>
这里是去的东西来体现：
<activity android:name="com.facebook.LoginActivity"
android:label="@string/app_name" />
<meta-data android:name="com.facebook.sdk.ApplicationId"
android:value="my_facebook_id"/>
我无法弄清楚了异常的原因，这将是巨大的帮助，如果有人可以建议我什么可能与此
我试图通过关于APPLICATION_ID指的帖子在网上研究会错误不能是空的，但他们的情况是非常不同的，所以我想发布一个新的问题，谢谢