我在 kotlin 中编码,并在我的布局中使用 from 。 xml,当我调用 bottomsheet_map 布局的子项时,我的应用程序崩溃了。
我的父布局:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
...
<include layout="@layout/bottomsheet_map" />
...
</androidx.constraintlayout.widget.ConstraintLayout>
和 bottomsheet_map.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/bottomsheet_map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/bg_app"
android:elevation="@dimen/medium"
android:fadingEdgeLength="@dimen/xLarge"
android:orientation="vertical"
app:behavior_peekHeight="50dp"
app:layout_behavior="com.idmpGroup.rtour.utilities.UI.AnchorSheetBehavior">
<RelativeLayout
android:id="@+id/tap_action_layout"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@android:color/white"
android:elevation="@dimen/xSmall"
android:fadingEdgeLength="@dimen/standard"
android:gravity="center"
android:paddingStart="@dimen/standard"
android:paddingTop="@dimen/medium"
android:paddingEnd="@dimen/standard"
android:paddingBottom="@dimen/medium">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<View
android:layout_width="@dimen/xLarge"
android:layout_height="@dimen/xSmall"
android:layout_gravity="center"
android:background="@drawable/dr_btn_radius_solid2" />
<TextView
android:id="@+id/bottom_sheet_title"
style="@style/tvToolbar_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/medium"
android:gravity="center"
android:text="@string/show_list"
android:textColor="#979797" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
当我想在 onCreateView 中将 OnClickListener 设置为 tap_action_layout 时我崩溃了
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.layout, container, false)
tap_action_layout.setOnClickListener { v: View? ->
//....
}
return view
}
注意:我不会使用 findViewByID。是否有更好的解决方案来调用 tap_action_layout 而不使用 findViewByID()????
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.RelativeLayout.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.idmpGroup.rtour.fragments.BAS.NearlyFrag.onCreateView(NearlyFrag.kt:258)
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2600)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:881)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:907)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:216)
at android.app.ActivityThread.main(ActivityThread.java:7625)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
最佳答案
在 onViewCreated
而不是 onCreateView
中试试这个
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
tap_action_layout.setOnClickListener { v: View? ->
//....
}
}
关于android - 我在 kotlin 中使用 xml <include/> 标签时崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57990167/