Java NullPointerException:尝试在EditText上调用虚拟方法_Java_Android_Android Studio_Nullreferenceexception

Java NullPointerException:尝试在EditText上调用虚拟方法

java android android-studio

Java NullPointerException:尝试在EditText上调用虚拟方法,java,android,android-studio,nullreferenceexception,Java,Android,Android Studio,Nullreferenceexception,2019-02-13 21:35:52.118 9765-9765/E/AndroidRuntime:致命异常：主工艺流程：PID:9765 java.lang.RuntimeException:无法启动活动：java.lang.NullPointerException:尝试对空对象引用调用虚拟方法“void com.google.android.gms.location.places.ui.PlaceAutocompleteFragment.setOnPlaceSelectedListene

2019-02-13 21:35:52.118 9765-9765/E/AndroidRuntime:致命异常：主工艺流程：PID:9765 java.lang.RuntimeException:无法启动活动：java.lang.NullPointerException:尝试对空对象引用调用虚拟方法“void com.google.android.gms.location.places.ui.PlaceAutocompleteFragment.setOnPlaceSelectedListener（com.google.android.gms.location.places.ui.PlaceSelectionListener）” 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2724）上位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2789）位于android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1527）位于android.os.Handler.dispatchMessage（Handler.java:110）位于android.os.Looper.loop（Looper.java:203）位于android.app.ActivityThread.main（ActivityThread.java:6251）位于java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1063）上位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:924）原因：java.lang.NullPointerException:尝试在空对象引用上调用虚拟方法“void com.google.android.gms.location.places.ui.PlaceAutocompleteFragment.setOnPlaceSelectedListener（com.google.android.gms.location.places.ui.PlaceSelectionListener）” 在uber.DriverEdm.onCreate上（DriverEdm.java:180）位于android.app.Activity.performCreate（Activity.java:6673）位于android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1118）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2677）上位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2789）位于android.app.ActivityThread.-wrap12（ActivityThread.java）在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1527）位于android.os.Handler.dispatchMessage（Handler.java:110）位于android.os.Looper.loop（Looper.java:203）位于android.app.ActivityThread.main（ActivityThread.java:6251）位于java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1063）上位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:924）`

正如我所见，NullPointerException位于AutoCompleteFragment中，而不是EditText中

您可以尝试此更改，请告诉我它是否适用于您：

替换

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<fragment
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.gms.location.places.ui.PlaceAutocomplete"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_margin="0dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/map"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_above="@+id/pannel"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_marginBottom="8dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/pannel"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/place_autocomplete_fragment" />

<LinearLayout
    android:id="@+id/pannel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentBottom="true"
    android:layout_marginTop="8dp"
    android:orientation="vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/map">

    <Switch
        android:id="@+id/workingSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10sp"
        android:text="Working" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/settings"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_weight="1"
            android:text="Find User" />
    </LinearLayout>

</LinearLayout>

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--------- beginning of crash

<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<fragment
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.gms.location.places.ui.PlaceAutocomplete"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_margin="0dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/map"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_above="@+id/pannel"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_marginBottom="8dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/pannel"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/place_autocomplete_fragment" />

<LinearLayout
    android:id="@+id/pannel"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentBottom="true"
    android:layout_marginTop="8dp"
    android:orientation="vertical"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/map">

    <Switch
        android:id="@+id/workingSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10sp"
        android:text="Working" />


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/settings"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_weight="1"
            android:text="Find User" />
    </LinearLayout>

</LinearLayout>

<fragment
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.gms.location.places.ui.PlaceAutocomplete"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_margin="0dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/map"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<fragment
    android:id="@+id/place_autocomplete_fragment"
    android:name="com.google.android.gms.location.places.ui.SupportPlaceAutocompleteFragment"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_margin="0dp"
    android:layout_weight="5"
    app:layout_constraintBottom_toTopOf="@+id/map"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

SupportPlaceAutocompleteFragment places = (SupportPlaceAutocompleteFragment)
            getChildFragmentManager()
                    .findFragmentById(R.id.place_autocomplete_fragment);