NPE而膨胀布局（试图调用一个空对象引用虚拟方法“布尔java.lang.String.equals

2019-06-17 10:43发布

站内文章 / 前沿技术
41 0 0

我不断收到一个java.lang.NullPointerException当我尝试使用ScrollView的活动。

奇怪的是，我已经使用了完全相同的Scrollview的其他活动设置。 和所有突然遇到错误。 我试图清理项目和重建。

我累了，好旧的重启程序。 我今天学到了很多关于空指针异常，但我一直没能弄清楚为什么我一直得到呈现问题 。

这是java.lang.NullPointerException是在XML抛出： 

java.lang.NullPointerException
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:738)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:149)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:835)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:223)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:426)
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:510)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:498)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:888)
    at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:498)
    at com.android.tools.idea.rendering.RenderTask.access$600(RenderTask.java:72)
    at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:610)
    at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:607)
    at com.android.tools.idea.rendering.RenderService.runRenderAction(RenderService.java:362)
    at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:607)
    at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:629)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:652)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:80)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:594)
    at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:589)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
    at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
    at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

所以，这一切都不是我写的代码。 所以，我一头扎进了堆栈跟踪，发现这一点： 

  java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
        at android.app.ActivityThread.access$800(ActivityThread.java:151)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5254)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
              at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:715)
              at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
              at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
              at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
              at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
              at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
              at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
              at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
              at android.app.Activity.setContentView(Activity.java:2145)
              at com.mitchellpalermo.tutroubleshooting.ContactPage.onCreate(ContactPage.java:11)
              at android.app.Activity.performCreate(Activity.java:5990)
              at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
              at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
              at android.app.ActivityThread.access$800(ActivityThread.java:151) 
              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
              at android.os.Handler.dispatchMessage(Handler.java:102) 
              at android.os.Looper.loop(Looper.java:135) 
              at android.app.ActivityThread.main(ActivityThread.java:5254) 
              at java.lang.reflect.Method.invoke(Native Method) 
              at java.lang.reflect.Method.invoke(Method.java:372) 
              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

它指向的Contact.java文件第11行 。 它看起来像这样（我已经把周围的线11个指标）： 

  package com.mitchellpalermo.tutroubleshooting;

  import android.app.Activity;
  import android.os.Bundle;

  public class Contact extends Activity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_contact); // line 11
        }
  }

我看不出有11行的一个问题。

现在，我无法弄清楚什么是错我的代码。 呈现问题之间NullPointerExceptions ，我无法弄清楚什么是真正错我的代码。

这是XML在这一活动中的一个例子ScrollView不抛出任何错误： 

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context="com.mitchellpalermo.tutroubleshooting.ComputerOrProjector">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical">

        <TextView
            style="@style/HeaderStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/solutions"
            android:textStyle="bold" />

        <!-- A CardView that contains a TextView -->
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_margin="15dp"
            card_view:cardBackgroundColor="#FFFFFF"
            card_view:cardCornerRadius="4dp"
            card_view:cardElevation="5dp">

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

                <TextView
                    style="@style/Solution"
                    android:text="@string/pc_v_fifth" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:background="@android:color/darker_gray" />

                <TextView
                    style="@style/Solution"
                    android:text="@string/pc_v_first" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:background="@android:color/darker_gray" />

                <TextView
                    style="@style/Solution"
                    android:text="@string/pc_v_second" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:background="@android:color/darker_gray" />

                <TextView
                    style="@style/Solution"
                    android:text="@string/pc_v_third" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:background="@android:color/darker_gray" />


                <TextView
                    style="@style/Solution"
                    android:text="@string/pc_v_fourth" />

                <View
                    android:layout_width="match_parent"
                    android:layout_height="2dp"
                    android:background="@android:color/darker_gray" />

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

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

            <Button
                style="@style/NextButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:onClick="sendEmail"
                android:text="@string/fixed"
                android:textStyle="bold" />

            <Button
                style="@style/NextButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:onClick="notFixedButton"
                android:text="@string/not_fixed"
                android:textStyle="bold" />

        </LinearLayout>

    </LinearLayout>

</ScrollView>

这里是我收到的错误行为 ： 

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:fillViewport="false">


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

        <TextView
            style="@style/HeaderStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/still_not_fixed" />

        <!-- A CardView that contains a TextView -->
        <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_margin="15dp"
            card_view:cardBackgroundColor="#FFFFFF"
            card_view:cardCornerRadius="4dp"
            card_view:cardElevation="5dp">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/hector" />

            <view
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:backgroundTint="@android:color/darker_gray" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/robert" />

            <view
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:backgroundTint="@android:color/darker_gray" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/mitch" />

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

    </LinearLayout>

</ScrollView>

有什么建议？ 而感谢你这么多提前！

Answer 1:

更改<view到<View ，因为view是不是空的观点。 这是通过定义自定义视图class ATTR，象下面这样： 

<view
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    class="com.your.package.YourCustomView" />

和你有

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference

因为LayoutInflater试图解析class ATTR：

LayoutInflater源代码 

//...
View createViewFromTag(View parent, String name, Context context, AttributeSet attrs,
        boolean ignoreThemeAttr) {
    if (name.equals("view")) { // line 724
        name = attrs.getAttributeValue(null, "class"); // line 725
    }

    // Apply a theme wrapper, if allowed and one is specified.
    if (!ignoreThemeAttr) {
        final TypedArray ta = context.obtainStyledAttributes(attrs, ATTRS_THEME);
        final int themeResId = ta.getResourceId(0, 0);
        if (themeResId != 0) {
            context = new ContextThemeWrapper(context, themeResId);
        }
        ta.recycle();
    }

    if (name.equals(TAG_1995)) { // line 738
        // Let's party like it's 1995!
        return new BlinkLayout(context, attrs);
    }
//...
  • 上线724就检查标签是view ，并得到true
  • 上线725就试图通过获取类class ATTR，并得到null
  • 上线738它试图检查blink的标签，并得到崩溃

此外，还有一个奇怪的事情，Android开发加入复活节彩蛋，你可以尝试一下： 

<view
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    class="blink">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Some text" />
</view>


Answer 2:

术后第2天我解决了这个问题，使用视图 ，而不是图 

<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="#faf4f4"></View>


Answer 3:

替换“视图”标签“查看”标签，这是解决方案。

对于

此错误.... 

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference


文章来源: NPE while inflating layout (Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference)
标签： android nullpointerexception layout-inflater android-inflate inflate-exception
举报

收藏的人(0)

Ta的文章 更多文章
登录 后发表评论
0条评论
还没有人评论过~