相关疑难解决方法(0)

我有3个片段,一个NavigationDrawer,一个MapFragment和一个用户定义的"MapInfoFragment".我希望"MapInfoFragment"在某些事件上在MapFragment顶部显示为半透明,在其他事件上消失.如果我每次都完全删除片段并创建一个新片段,或者我只是更改显示的可见性和信息,我真的不在乎.目前我只是尝试使用FragmentManager的.hide()函数,但我也尝试过.remove和.detach,结果相似.

错误:

03-18 14:28:10.965  24711-24711/com.[packageName].asTest D/AndroidRuntime? Shutting down VM
03-18 14:28:10.965  24711-24711/com.[packageName].asTest E/AndroidRuntime? FATAL EXCEPTION: main
Process: com.[packageName].asTest, PID: 24711
java.lang.NullPointerException: Attempt to write to field 'int android.app.Fragment.mNextAnim' on a null object reference
        at android.app.BackStackRecord.run(BackStackRecord.java:658)
        at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
        at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5017)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

activity_main.xml中:

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.[packageName].asTest.MainActivity">

    <!-- As the main content view, the view below consumes the entire
         space available using match_parent in both …