我按照Facebook教程集成SDK,刚刚在我的.xml文件中添加了登录到Facebook按钮后,我的应用程序将编译,打开(在我的Nexus 4上运行Lollipop,项目针对kitkat +),然后崩溃.我正在开发完全更新的Android Studio.
logcat的:
02-07 22:48:24.340 1563-1600/com.example.prachi.mapsapplication E/AndroidRuntime? FATAL EXCEPTION: AsyncTask #1
Process: com.example.prachi.mapsapplication, PID: 1563
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:746)
at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:774)
at com.facebook.internal.Utility.queryAppSettings(Utility.java:673)
at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:678)
at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:675)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" …