将 SearchView 与 AppCompat 一起使用时出现空指针异常 [英] Null Pointer exception when using SearchView with AppCompat

问题描述

今天花时间迁移到AppCompat库.除了 SearchView 之外，我已经成功设置了所有内容.

以前，它运行正常，但现在我在使用代码时不断收到 nullPointerException

searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

我到处寻找解决我的问题的方法，但我找不到任何地方(我试过的都行不通).

任何指导将不胜感激，ty.

这是我打电话的地方:

@Override公共布尔 onCreateOptionsMenu(菜单菜单){getMenuInflater().inflate(R.menu.main, menu);MenuItem searchItem = menu.findItem(R.id.search);SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));返回 super.onCreateOptionsMenu(menu);}

这是菜单 XML 文件:

<menu xmlns:android="http://schemas.android.com/apk/res/android"xmlns:compat="http://schemas.android.com/apk/res-auto"xmlns:app="http://schemas.android.com/apk/res/android" >><项目android:id="@+id/关于"android:orderInCategory="3"机器人:showAsAction =从不"android:title="@string/about"/><项目android:id="@+id/率"android:orderInCategory="2"机器人:showAsAction =从不"android:title="@string/rate"/><项目android:id="@+id/搜索"android:icon="@android:drawable/ic_menu_search"android:orderInCategory="1"app:actionViewClass="android.support.v7.widget.SearchView"compat:showAsAction="ifRoom|collapseActionView"></项目>

清单:

<块引用>

 <活动android:name="com.stack.overflow.MainActivity"android:label="@string/app_name"android:launchMode="singleTop"android:theme="@style/Theme.AppCompat" ><元数据android:name="android.app.default_searchable"android:resource="@xml/searchable"/><意图过滤器><action android:name="android.intent.action.MAIN"/><action android:name="android.intent.action.SEARCH"/><category android:name="android.intent.category.LAUNCHER"/></意图过滤器></活动>

Logcat:

致命异常:主要java.lang.NullPointerException在 com.stack.overflow.MainActivity.onCreateOptionsMenu(MainActivity.java:805)在 android.app.Activity.onCreatePanelMenu(Activity.java:2476)在 android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)在 android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:232)在 android.support.v7.app.ActionBarActivityDelegateICS.onCreatePanelMenu(ActionBarActivityDelegateICS.java:146)在 android.support.v7.app.ActionBarActivity.onCreatePanelMenu(ActionBarActivity.java:199)在 android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onCreatePanelMenu(ActionBarActivityDelegateICS.java:293)在 com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:393)在 com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:747)在 com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:2913)在 android.os.Handler.handleCallback(Handler.java:615)在 android.os.Handler.dispatchMessage(Handler.java:92)在 android.os.Looper.loop(Looper.java:137)在 android.app.ActivityThread.main(ActivityThread.java:4745)在 java.lang.reflect.Method.invokeNative(Native Method)在 java.lang.reflect.Method.invoke(Method.java:511)在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)在 dalvik.system.NativeStart.main(本机方法)

解决方案

也许是混淆问题...

尝试将其添加到您的 proguard 文件中:

-keep class android.support.v7.widget.SearchView { *;}

Today I have spent the time to migrate to the AppCompat library. I have setup everything successfully except my SearchView.

Before, it functioned properly, but now I keep getting nullPointerException when using the code

searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

I have looked everywhere to try and find a solution for my problem, but I can't find one anywhere(The ones I have tried don't work).

Any guidance would be appreciated, ty.

Here is where I am calling:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);

    MenuItem searchItem = menu.findItem(R.id.search);

    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

    SearchView searchView = (SearchView) MenuItemCompat
            .getActionView(searchItem);

    searchView.setSearchableInfo(searchManager
            .getSearchableInfo(getComponentName()));



    return super.onCreateOptionsMenu(menu);
}

Here is menu XML file:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:compat="http://schemas.android.com/apk/res-auto" 
xmlns:app="http://schemas.android.com/apk/res/android" >>

<item
    android:id="@+id/about"
    android:orderInCategory="3"
    android:showAsAction="never"
    android:title="@string/about"/>
<item
    android:id="@+id/rate"
    android:orderInCategory="2"
    android:showAsAction="never"
    android:title="@string/rate"/>
<item
    android:id="@+id/search"
    android:icon="@android:drawable/ic_menu_search"
    android:orderInCategory="1"
    app:actionViewClass="android.support.v7.widget.SearchView"
    compat:showAsAction="ifRoom|collapseActionView">
</item>

Manifest:

    <activity
        android:name="com.stack.overflow.MainActivity"
        android:label="@string/app_name"
        android:launchMode="singleTop"
        android:theme="@style/Theme.AppCompat" >
        <meta-data
            android:name="android.app.default_searchable"
            android:resource="@xml/searchable" />
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <action android:name="android.intent.action.SEARCH" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

Logcat:

FATAL EXCEPTION: main
java.lang.NullPointerException
at com.stack.overflow.MainActivity.onCreateOptionsMenu(MainActivity.java:805)
at android.app.Activity.onCreatePanelMenu(Activity.java:2476)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:232)
at android.support.v7.app.ActionBarActivityDelegateICS.onCreatePanelMenu(ActionBarActivityDelegateICS.java:146)
at android.support.v7.app.ActionBarActivity.onCreatePanelMenu(ActionBarActivity.java:199)
at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onCreatePanelMenu(ActionBarActivityDelegateICS.java:293)
at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:393)
at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:747)
at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:2913)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

解决方案

Maybe it's an obfuscation issue...

Try adding this to your proguard file:

-keep class android.support.v7.widget.SearchView { *; }

这篇关于将 SearchView 与 AppCompat 一起使用时出现空指针异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！