Android - 当活动发生变化时，滑动面板会崩溃

Question

我有一个活动，我定义了滑动面板，当我去不同的活动时，我总是得到NullPointerException。 那么，我怎样才能做到这一点呢？

的onCreate：

 @Override
protected void onCreate(final Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
    super.onCreate(savedInstanceState);
    // Load the music browser fragment
    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.activity_base_content, new MusicBrowserPhoneFragment()).commit();
    }

    preProcessingPanel();


    mLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);

    mLayout.setPanelSlideListener(new SlidingUpPanelLayout.PanelSlideListener() {...}

LOG CAT：

10-04 21:08:46.951  22229-22229/com.andrew.apollo E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.andrew.apollo/com.andrew.apollo.ui.activities.ProfileActivity}: java.lang.NullPointerException
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
        at android.app.ActivityThread.access$600(ActivityThread.java:130)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4745)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.NullPointerException
        at com.andrew.apollo.ui.activities.BaseActivity.setQueueFragment(BaseActivity.java:247)
        at com.andrew.apollo.ui.activities.BaseActivity.onCreate(BaseActivity.java:291)
        at com.andrew.apollo.ui.activities.ProfileActivity.onCreate(ProfileActivity.java:109)
        at android.app.Activity.performCreate(Activity.java:5008)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)