Android SearchView不起作用。

Question

我尝试更新所有的库，但仍然出现错误。我能在模拟器上运行该应用程序，但当我导出APK并在真实的Android设备上运行时，应用程序无法正常工作。

MinSdkVersion为8，targetSdkVersion为19。 请帮忙！！！

menu.xml

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

    <item
        android:id="@+id/action_showTC"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="Terms and Conditions"/>

    <item android:id="@+id/action_search"
          android:title="Search"
          android:orderInCategory="100"
          example:showAsAction="ifRoom|collapseActionView"
          example:actionViewClass="android.support.v7.widget.SearchView"/>

</menu>

SearchView

@Override
public boolean onOptionsItemSelected(MenuItem item){
    if(item.getItemId() == R.id.action_showTC){
        startActivity(new Intent(MainActivity.this, T_C.class));
        return true;
    }else{
        return super.onOptionsItemSelected(item);
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);

    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    SupportMenuItem searchMenuItem = ((SupportMenuItem) menu.findItem(R.id.action_search));
    SearchView searchView = (SearchView) searchMenuItem.getActionView();
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

    return super.onCreateOptionsMenu(menu);
}

清单文件

    <activity android:name="com.agehk.queue.SearchResultsActivity"
        android:parentActivityName="com.agehk.queue.MainActivity" >
        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />
        </intent-filter>

        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />
    </activity>

searchable.xml

<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
    android:hint="Search Queue"
    android:label="@string/app_name" />

错误

09-04 15:57:13.105: W/SupportMenuInflater(17184): Cannot instantiate class: android.support.v7.widget.SearchView
09-04 15:57:13.105: W/SupportMenuInflater(17184): java.lang.NoSuchMethodException: <init> [class android.content.Context]
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at java.lang.Class.getConstructorOrMethod(Class.java:423)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at java.lang.Class.getConstructor(Class.java:397)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.internal.view.f.a(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.internal.view.f.a(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.internal.view.f.b(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.internal.view.d.a(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.internal.view.d.inflate(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.agehk.queue.MainActivity.onCreateOptionsMenu(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.app.Activity.onCreatePanelMenu(Activity.java:2577)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v4.app.j.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.a.g.a(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.a.n.a(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.a.g.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.support.v7.a.o.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:414)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:777)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:199)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:835)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.view.Choreographer.doCallbacks(Choreographer.java:626)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.view.Choreographer.doFrame(Choreographer.java:589)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:821)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.os.Handler.handleCallback(Handler.java:730)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.os.Handler.dispatchMessage(Handler.java:92)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.os.Looper.loop(Looper.java:150)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at android.app.ActivityThread.main(ActivityThread.java:5390)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at java.lang.reflect.Method.invokeNative(Native Method)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at java.lang.reflect.Method.invoke(Method.java:525)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-04 15:57:13.105: W/SupportMenuInflater(17184):   at dalvik.system.NativeStart.main(Native Method)
09-04 15:57:13.105: D/AndroidRuntime(17184): Shutting down VM
09-04 15:57:13.105: W/dalvikvm(17184): threadid=1: thread exiting with uncaught exception (group=0x42f05500)
09-04 15:57:13.105: E/AndroidRuntime(17184): FATAL EXCEPTION: main
09-04 15:57:13.105: E/AndroidRuntime(17184): java.lang.NullPointerException
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.agehk.queue.MainActivity.onCreateOptionsMenu(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.app.Activity.onCreatePanelMenu(Activity.java:2577)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.support.v4.app.j.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.support.v7.a.g.a(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.support.v7.a.n.a(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.support.v7.a.g.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.support.v7.a.o.onCreatePanelMenu(Unknown Source)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:414)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:777)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:199)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:835)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.view.Choreographer.doCallbacks(Choreographer.java:626)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.view.Choreographer.doFrame(Choreographer.java:589)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:821)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.os.Handler.handleCallback(Handler.java:730)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.os.Looper.loop(Looper.java:150)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at android.app.ActivityThread.main(ActivityThread.java:5390)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at java.lang.reflect.Method.invokeNative(Native Method)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at java.lang.reflect.Method.invoke(Method.java:525)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-04 15:57:13.105: E/AndroidRuntime(17184):    at dalvik.system.NativeStart.main(Native Method)
09-04 15:57:13.115: D/BatteryStatsImpl(445): noteStopWakeLocked com.google.android.gms isFromForeground = false
09-04 15:57:13.115: W/ActivityManager(445):   Force finishing activity com.agehk.queue/.MainActivity

- We Rub Chan

---

你使用的最低SDK级别是多少？ - Alexander Zhak

Answer 1

在proguard-rules.pro中添加以下代码。

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

- Bao Le

---

使用Working比ActionbarActivity更好。 - Banee Ishaque K

我得到了一个未解决的类名。我没有包含某些东西吗？ - rial

Answer 2

您是否在构建中启用了Proguard？如果是这样，您可能希望确保appcompat库位于Proguard排除列表（在proguard.cfg中）。一种粗暴的方法是使用以下方式保留所有支持库类：

您是否开启了 Proguard ？如果是的话，您可能需要确保将 appcompat 库添加到 Proguard 的排除列表（在 proguard.cfg 中）。一种简单直接的方法是使用以下代码来保留所有支持库类：

   -keep class android.support.v4.app.** { *; }
   -keep interface android.support.v4.app.** { *; }
   -keep class android.support.v7.app.** { *; }
   -keep interface android.support.v7.app.** { *; }

在我的情况下，我有一个扩展了支持库SearchView的类，所以我将以下内容添加到我的proguard.cfg文件中：

-keep public class * extends android.support.v7.widget.SearchView {
   public <init>(android.content.Context);
   public <init>(android.content.Context, android.util.AttributeSet);
}

为避免错误，特别提到构造函数：

java.lang.NoSuchMethodException: <init> [class android.content.Context]

- RobD

---

这对我没有用，但是-keep class android.support.v7.widget.SearchView { *; } 可以。 - Ernest Poletaev

SearchView位于android.support.v7.widget而不是android.support.v7.app包中，因此最好使用-keep class android.support.v7.** { *; }。 - Simon K. Gerges

相关问题：https://code.google.com/p/android/issues/detail?id=224967 - BoD

Answer 3

经过长时间的研究，解决这个问题的简单方法就是添加：

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

在AndroidStudio的app/proguard/android.proguard文件中。

祝福！

- Sam Reyes

Answer 4

在proguard-rules.pro中所需的最低要求

-keep class android.support.v7.widget.SearchView {
   public <init>(android.content.Context);
   public <init>(android.content.Context, android.util.AttributeSet);
}

- Вячеслав Сыряев

---

这个解决方案今天仍然是有效的。当我从com.android.tools.build:gradle:2.2.0更新到com.android.tools.build:gradle:2.2.2时，发现了这个Bug，并且这个简要的Proguard规则修复了它。 - Carmen

Answer 5

我也得到了

Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setOnQueryTextListener(android.support.v7.widget.ao)' on a null object reference

当我启动我的发布版本构建时（启用了Proguard / Minify）。

将此添加到Proguard规则中即可解决：

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

这将保留SearchView小部件，但仍允许proguard丢弃您未使用的任何其他支持库类，因此您可以保持发布版本的整洁。

- Ciske

Answer 6

针对AndroidX搜索视图的proguard，您需要使用以下内容：

最初的回答：

-keep class androidx.appcompat.widget.SearchView { *; }

- Mujahid Khan

---

感谢您提供这段代码片段，它可能会提供一些有限的、即时的帮助。一个适当的解释将极大地提高其长期价值，因为它可以展示为什么这是一个好的问题解决方案，并使其对未来读者有其他类似问题的人更有用。请[编辑]您的答案以添加一些解释，包括您所做的假设。 - Dwhitz

Answer 7

我必须添加这个，现在它运行得很顺畅：

-keep class android.support.v7.widget.SearchView {
   public <init>(android.content.Context);
   public <init>(android.content.Context, android.util.AttributeSet);
}
-keep interface android.support.v7.widget.SearchView {
   public <init>(android.content.Context);
   public <init>(android.content.Context, android.util.AttributeSet);
}

- Sid

Answer 8

对于 API 版本在 11 之前的应用，你应该在兼容模式下初始化 Action Bar 项：

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        MenuItem searchMenuItem = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView)MenuItemCompat.getActionView(searchMenuItem);
        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        return true;
    }

更新：
我尝试在API 8模拟器和4.4 KitKat上重现它。不幸的是，我的2.3.8设备一段时间前就变砖了，所以无法在低API的硬件上检查。我能建议你的是：
1. 检查SearchView是否从android.support.v7.widget.SearchView;导入；
2. 检查菜单资源是否正确：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto" <----------- init compatible namespace
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity" >

    <item
        android:id="@+id/action_showTC"
        android:orderInCategory="100"
        android:title="@string/terms_and_conditions"
        app:showAsAction="never"/>  <----------- use compatible namespace

    <item android:id="@+id/action_search"
          android:title="@string/search"
          android:orderInCategory="100"  <---------- use different value
          app:showAsAction="ifRoom|collapseActionView"
          app:actionViewClass="android.support.v7.widget.SearchView"/>

</menu>

如果没有底层处理（Activity类未被子类化），则从onCreateOptionsMenu返回true。

更新2：明白了！您可能是从Activity类继承的。应该使用ActioBarActivity：

public class MainActivity extends ActionBarActivity {
...

- Alexander Zhak

---

就像这样，但它仍然出现了相同的错误。 MenuItem searchMenuItem = menu.findItem(R.id.action_search); SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE); SearchView searchView = (SearchView)MenuItemCompat.getActionView(searchMenuItem); searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); - We Rub Chan

请查看http://developer.android.com/training/search/backward-compat.html＃check-ver - Alexander Zhak

我不知道哪里出了问题，但它仍然无法工作。你能否请展示给我如何编写整个部分。这个问题困扰了我很长时间。拜托！！！ - We Rub Chan

@WeRubChan，如果有帮助，请查看更新。根据您提供的代码片段，我无法重现该问题。 - Alexander Zhak

但是ActionBarActivity已经被弃用。 - Banee Ishaque K