我试图使用Facebook SDK(3.17.1)实现Android的Facebook登录,但我遇到了一些我过去没有遇到过的问题。 首先,登录按钮不能完全呈现。这就是我得到的
而不是:
(注意缺少的Facebook徽标)。当我运行应用程序时,它在崩溃之前的瞬间显示它应该的方式(使用Facebook徽标)。
当应用程序崩溃时,我收到此错误消息
"Unfortunately, FacebookLoginTest as stopped"
这在Logcat:
08-12 22:19:08.751: E/AndroidRuntime(7731): FATAL EXCEPTION: AsyncTask #1
08-12 22:19:08.751: E/AndroidRuntime(7731): Process: com.example.facebooklogintest, PID: 7731
08-12 22:19:08.751: E/AndroidRuntime(7731): java.lang.RuntimeException: An error occured while executing doInBackground()
08-12 22:19:08.751: E/AndroidRuntime(7731): at android.os.AsyncTask$3.done(AsyncTask.java:300)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
08-12 22:19:08.751: E/AndroidRuntime(7731): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.lang.Thread.run(Thread.java:864)
08-12 22:19:08.751: E/AndroidRuntime(7731): Caused by: java.lang.NullPointerException
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
08-12 22:19:08.751: E/AndroidRuntime(7731): at com.facebook.internal.Utility.queryAppSettings(Utility.java:377)
08-12 22:19:08.751: E/AndroidRuntime(7731): at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:677)
08-12 22:19:08.751: E/AndroidRuntime(7731): at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:1)
08-12 22:19:08.751: E/AndroidRuntime(7731): at android.os.AsyncTask$2.call(AsyncTask.java:288)
08-12 22:19:08.751: E/AndroidRuntime(7731): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-12 22:19:08.751: E/AndroidRuntime(7731): ... 4 more
08-12 22:19:10.753: D/Process(7731): killProcess, pid=7731
08-12 22:19:10.753: D/Process(7731): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException:131 java.lang.ThreadGroup.uncaughtException:693 java.lang.ThreadGroup.uncaughtException:690
我按照说明将Facebook登录添加到Android应用程序:
除此之外,我的活动和清单中没有任何改变。 我在三个不同的eclipse版本中尝试了这个,都有相同的错误,但后来我删除了.xml文件中的Facebook登录按钮代码,应用程序推出就好了。 不知道还有什么应该做的。 以下是MainActivity和Layout.xml代码:
MainActivity.java
package com.example.facebooklogintest;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml中
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.facebooklogintest.MainActivity" >
<com.facebook.widget.LoginButton
android:id="@+id/authButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_gravity="center_horizontal"
android:layout_marginTop="30dp" />
</RelativeLayout>
答案 0 :(得分:20)
您需要在清单文件中更改或添加
<activity
android:name="com.example.LoginActivity"
android:label="@string/app_name"
android:parentActivityName="com.example.MainActivity" >
</activity>
<activity android:name="com.facebook.LoginActivity"
android:theme="@android:style/Theme.Translucent.NoTitleBar"
android:label="@string/app_name" />
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"/>
我不能相信这一点,所有的功劳必须归功于发布答案的人here我纯粹为你添加代码以及因为我之前删除了答案的人告诉了我。
答案 1 :(得分:0)
10-10 11:27:47.932: E/AndroidRuntime(25915): FATAL EXCEPTION: AsyncTask #5
10-10 11:27:47.932: E/AndroidRuntime(25915): Process: com.example.version_2, PID: 25915
10-10 11:27:47.932: E/AndroidRuntime(25915): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
10-10 11:27:47.932: E/AndroidRuntime(25915): at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:746)
10-10 11:27:47.932: E/AndroidRuntime(25915): at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:774)
10-10 11:27:47.932: E/AndroidRuntime(25915): at com.facebook.internal.Utility.queryAppSettings(Utility.java:822)
10-10 11:27:47.932: E/AndroidRuntime(25915): at com.facebook.login.widget.LoginButton$1.run(LoginButton.java:489)
如果您在FB集成中遇到上述错误,则以下解决方案将起作用。只需在menifest文件的Meta-data标签中添加Application ID即可。它会正常工作
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"/>