Question

我在我的Flickr应用程序中使用搜索视图，但是当我运行时，它只显示搜索视图的标题而不是它的搜索图标，当我点击标题时它应该显示和区域以键入搜索查询但是什么都没发生对待就像一个简单的工具栏项

这是菜单xml文件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:tools="http://schemas.android.com/tools"
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/menu_item_search"
        android:title="@string/search"
        app:actionViewClass="android:support.v7.widget.searchView"
        app:showAsAction="ifRoom"/>

    <item android:id="@+id/menu_item_clear"
          android:title="@string/clear_search"
          app:showAsAction="never"/>
</menu>

这是模拟器中app的图片

当我引用代码并为搜索视图操作视图类设置文本侦听器时，它引用空引用错误

public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);

        inflater.inflate(R.menu.fragment_photo_gallery,menu);

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

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

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String s) {

                Log.d(TAG,"QueryTextSubmit: "+s);
                updateItems();
                return true;

            }

            @Override
            public boolean onQueryTextChange(String s) {

                Log.d(TAG,"queryTextChanged: "+s);
                return true;
            }
        });


    }

这是我崩溃后的logcat

09-05 15:04:25.759 14339-14339/com.bignerdranch.android.photogallery E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                       Process: com.bignerdranch.android.photogallery, PID: 14339
                                                                                       java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setOnQueryTextListener(android.support.v7.widget.SearchView$OnQueryTextListener)' on a null object reference
                                                                                           at com.bignerdranch.android.photogallery.PhotoGalleryFragment.onCreateOptionsMenu(PhotoGalleryFragment.java:71)
                                                                                           at android.support.v4.app.Fragment.performCreateOptionsMenu(Fragment.java:2291)
                                                                                           at android.support.v4.app.FragmentManagerImpl.dispatchCreateOptionsMenu(FragmentManager.java:3011)
                                                                                           at android.support.v4.app.FragmentController.dispatchCreateOptionsMenu(FragmentController.java:328)
                                                                                           at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:363)
                                                                                           at android.support.v7.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:98)
                                                                                           at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.onCreatePanelMenu(AppCompatDelegateImplBase.java:335)
                                                                                           at android.support.v7.app.AppCompatDelegateImplV9.preparePanel(AppCompatDelegateImplV9.java:1368)
                                                                                           at android.support.v7.app.AppCompatDelegateImplV9.doInvalidatePanelMenu(AppCompatDelegateImplV9.java:1648)
                                                                                           at android.support.v7.app.AppCompatDelegateImplV9$1.run(AppCompatDelegateImplV9.java:137)
                                                                                           at android.os.Handler.handleCallback(Handler.java:751)
                                                                                           at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                           at android.os.Looper.loop(Looper.java:154)
                                                                                           at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)

Answer 1

作为Commented您需要编写android:support.v7.widget.SearchView来解决相应的类命名约定

并添加collapseActionView|以进行折叠功能

<item
        android:id="@+id/menu_item_search"
        android:title="@string/search"
        app:actionViewClass="android:support.v7.widget.SearchView"
        app:showAsAction="collapseActionView|ifRoom"/>

Answer 2

我已将appcompact库的版本更改为25.3.0并解决了

我认为图书馆已损坏。

这是我的gradle的代码

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.0'
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:recyclerview-v7:25.3.0'
}

Answer 3

更改此使用android:support.v7.widget.SearchView instedof android:support.v7.widget.searchView

<item
   android:id="@+id/menu_item_search"
   android:title="@string/search"
   app:actionViewClass="android:support.v7.widget.SearchView"
   app:showAsAction="ifRoom"/>

搜索视图在android工具栏中无法正常工作

3 个答案: