堆棧內存溢出
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如何引用膨脹的視圖元素？

[英]How to reference the inflated view elements?

 原文  2017-09-11 06:28:59  6   1    android/ android-inflate

問題描述

我需要一些幫助。 我誇大了看法。 該視圖基本上是其中包含微調器的卡片視圖。

像這樣單擊按鈕會放大視圖： 

itineraryDetailLL = (LinearLayout) findViewById(R.id.itineraryDetailLinearlayout);
View childView = getLayoutInflater().inflate(R.layout.cardview, null);
itineraryDetailLL.addView(childView);

現在的問題是，每當我在第一個膨脹的卡視圖中單擊微調器時，它都可以正常工作，但是在第二個膨脹的視圖中單擊微調器時，會出現以下錯誤： 

09-11 10:54:44.976 31698-31698/com.application.marketvisit E/InputEventReceiver: Exception dispatching input event.
09-11 10:54:44.976 31698-31698/com.application.marketvisit E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
09-11 10:54:44.986 31698-31698/com.application.marketvisit E/MessageQueue-JNI: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Filter.filter(java.lang.CharSequence, android.widget.Filter$FilterListener)' on a null object reference
                                                                                   at android.widget.AutoCompleteTextView.performFiltering(AutoCompleteTextView.java:861)
                                                                                   at com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner.onFocusChanged(MaterialBetterSpinner.java:49)
                                                                                   at android.view.View.handleFocusGainInternal(View.java:4962)
                                                                                   at android.view.View.requestFocusNoSearch(View.java:7678)
                                                                                   at android.view.View.requestFocus(View.java:7657)
                                                                                   at android.view.View.requestFocus(View.java:7624)
                                                                                   at android.view.View.requestFocus(View.java:7603)
                                                                                   at com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner.onTouchEvent(MaterialBetterSpinner.java:74)
                                                                                   at android.view.View.dispatchTouchEvent(View.java:8471)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                   at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
                                                                                   at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
                                                                                   at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
                                                                                   at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
                                                                                   at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
                                                                                   at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
                                                                                   at android.view.View.dispatchPointerEvent(View.java:8666)
                                                                                   at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
                                                                                   at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
                                                                                   at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
                                                                                   at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
                                                                                   at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
                                                                                   at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
                                                                                   at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
                                                                                   at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
                                                                                   at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
                                                                                   at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
                                                                                at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.
09-11 10:54:44.988 31698-31698/com.application.marketvisit E/AndroidRuntime: FATAL EXCEPTION: main
                                                                             Process: com.application.marketvisit, PID: 31698
                                                                             java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Filter.filter(java.lang.CharSequence, android.widget.Filter$FilterListener)' on a null object reference
                                                                                 at android.widget.AutoCompleteTextView.performFiltering(AutoCompleteTextView.java:861)
                                                                                 at com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner.onFocusChanged(MaterialBetterSpinner.java:49)
                                                                                 at android.view.View.handleFocusGainInternal(View.java:4962)
                                                                                 at android.view.View.requestFocusNoSearch(View.java:7678)
                                                                                 at android.view.View.requestFocus(View.java:7657)
                                                                                 at android.view.View.requestFocus(View.java:7624)
                                                                                 at android.view.View.requestFocus(View.java:7603)
                                                                                 at com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner.onTouchEvent(MaterialBetterSpinner.java:74)
                                                                                 at android.view.View.dispatchTouchEvent(View.java:8471)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
                                                                                 at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
                                                                                 at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
                                                                                 at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
                                                                                 at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
                                                                                 at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
                                                                                 at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
                                                                                 at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
                                                                                 at android.view.View.dispatchPointerEvent(View.java:8666)
                                                                                 at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
                                                                                 at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
                                                                                 at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
                                                                                 at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
                                                                                 at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
                                                                                 at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
                                                                                 at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
                                                                                 at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
                                                                                 at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
                                                                                at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java

這是我要誇張的cardview.xml： 

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="400dp"
        card_view:cardElevation="5dp"
        card_view:cardUseCompatPadding="true"
        card_view:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="8dp"
        android:layout_marginLeft="8dp"
        card_view:layout_constraintLeft_toRightOf="parent"
        android:layout_marginStart="8dp">

<com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner
                android:id="@+id/zonePlanItineraryspinner"
                android:layout_width="240dp"
                android:layout_height="wrap_content"
                android:hint="Select a Zone"
                app:met_floatingLabel="normal"
                android:layout_below="@id/deletePlanItinerary"
                android:layout_marginLeft="20dp" />

    </android.support.v7.widget.CardView>

</LinearLayout>

1 個解決方案

解決方案1
 0 已采納  2017-09-11 06:56:53

盡可能不要在一個布局中使用多個ID，Android僅檢測一個ID，因此在堆棧跟蹤中null object reference了null object reference 。

根據API指南：

ID不必在整個樹中都是唯一的，但它在您要搜索的樹的一部分中應該是唯一的（它可能通常是整個樹，因此最好在可能的情況下完全唯一）。

https://developer.android.com/guide/topics/ui/declaring-layout.html#id

編輯

由於您要膨脹具有相同ID的新布局，請嘗試以下操作： 

View childView = getLayoutInflater().inflate(R.layout.cardview, null);
MaterialBetterSpinner spnr = childView.findViewById(R.id.zonePlanItineraryspinner);
spnr.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // New CardView layout spinner code goes here...
    } 
});

您應該使用新增加的布局按ID查找視圖。

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