重大SearchView实施错误 [英] Material SearchView implementation error
问题描述
我正在开发一个android应用程序,到目前为止一切都很好,但是当尝试按照Google准则实施Material SearchView并逐步执行一些教程时,我无法弄清楚这个错误:
I'm developing an android app, by now everything great, but when try to implement a Material SearchView with Google guidelines and following step by step some tutorials I can't figureout this error:
menu_main.xml
menu_main.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/search_ad"
android:enabled="true"
android:icon="@android:drawable/ic_menu_search"
android:title="Buscar"
android:visible="true"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="ifRoom|collapseActionView" />
<item
android:id="@+id/publish_ad"
android:enabled="true"
android:icon="@android:drawable/ic_menu_send"
android:title="Publicar anuncio"
android:visible="true"
app:showAsAction="never" />
<item
android:id="@+id/favs"
android:enabled="true"
android:title="Configuración"
android:visible="true"
app:showAsAction="never" />
</menu>
MainActivity
MainActivity
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.search_ad).getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setIconifiedByDefault(false);
return true;
}
错误:
06-16 15:36:51.021 1239-1239/com.bachecubano.elbache E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.bachecubano.elbache, PID: 1239
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setSearchableInfo(android.app.SearchableInfo)' on a null object reference
at com.bachecubano.elbache.MainActivity.onCreateOptionsMenu(Unknown Source)
at android.app.Activity.onCreatePanelMenu(Activity.java:2889)
at android.support.v4.b.m.onCreatePanelMenu(Unknown Source)
at android.support.v7.view.i.onCreatePanelMenu(Unknown Source)
at android.support.v7.app.h$b.onCreatePanelMenu(Unknown Source)
at android.support.v7.view.i.onCreatePanelMenu(Unknown Source)
at android.support.v7.app.q.j(Unknown Source)
at android.support.v7.app.q$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5692)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:769)
推荐答案
您是否在清单中添加了以下代码:
Do you have added the following code on your manifest :
<activity
android:name=".ActivityWhereYouWantYourSearch">
...
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data android:name="android.app.searchable"
android:resource="@xml/searchable"/>
</activity>
这在您的 res/xml 文件夹(名为 searchable.xml )上:
And this on your res/xml folder (named searchable.xml) :
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:hint="@string/search_hint"
android:label="@string/app_name"
android:searchSettingsDescription="@string/search_description" />
我还将对您的 onCreateOptionsMenu
进行检查,如下所示:
I will also put a check on your onCreateOptionsMenu
, like this:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
MenuItem searchItem = menu.findItem(R.id.search_ad);
if (searchItem != null) {
SearchManager searchManager = (SearchManager)getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) searchItem.getActionView();
// Assumes current activity is the searchable activity
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setIconifiedByDefault(false); // Do not iconify the widget; expand it by default
}
return true;
}
顺便说一句,我不使用 android:enabled
和 android:visible
,但这由您决定.
BTW, I don't use android:enabled
and android:visible
, but it's up to you to decide.
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