自app app以来,Searchview无效

Question

自从我实现app compat后,我的searchview不再起作用了:

 Process: com.laurenswuyts.witpa, PID: 26666
    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.laurenswuyts.witpa.Activities.Events.EventActivity.onCreateOptionsMenu(EventActivity.java:75)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2820)
            at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:275)
            at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:276)
            at android.support.v7.app.ActionBarActivityDelegate$1.onCreatePanelMenu(ActionBarActivityDelegate.java:79)
            at android.support.v7.widget.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:49)
            at android.support.v7.internal.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:459)
            at android.support.v7.internal.app.ToolbarActionBar$1.run(ToolbarActionBar.java:69)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

因此,当我拥有它时,搜索视图的nullpointer:

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.event_main, menu);

        // Get the SearchView and set the searchable configuration
        // Associate searchable configuration with the SearchView
        SearchManager searchManager =
                (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        SearchView searchView =
                (SearchView) menu.findItem(R.id.action_search).getActionView();
        searchView.setSearchableInfo(
                searchManager.getSearchableInfo(getComponentName()));


        return super.onCreateOptionsMenu(menu);
    }

在我的菜单中我有这个:

<!-- Search Widget -->
  <item android:id="@+id/action_search"
      android:title="@string/action_search"
      android:icon="@drawable/ic_action_search"
      app:showAsAction="always"
      android:actionViewClass="android.support.v7.widget.SearchView"/>

我不知道为什么它不再起作用,但它发生在我开始使用app compat 21之后.

问候,

Answer 1

尝试使用自定义app命名空间actionViewClass:

app:actionViewClass="android.support.v7.widget.SearchView"/>

Answer 2

将以下行添加到app文件夹中的proguard-rules.pro文件中:

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

Answer 3

如果你启用了proguard并且它正在逐渐消失,那么也可能发生这种情况SearchView.您需要修改proguard设置以保持课程.

有关详细信息,请参阅此问题.

Answer 4

这是Simas回答的另一个信息.我在另一个答案(/sf/answers/2338056591/)中找到了这个,这对解决我的异常非常重要:

请注意,它app:actionViewClass 不是 android:actionViewClass

Answer 5

经过一段时间玩"运行和错误"我找到了一个解决方案..看起来像UI元素不是导致错误的原因.将搜索设置为QueryListener后,它运行良好.这是一些代码:

包含SearchBar的Activity:

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

        SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String s) {
                Log.d(TAG, "onQueryTextSubmit ");
                return false;
            }

            @Override
            public boolean onQueryTextChange(String s) {
                Log.d(TAG, "onQueryTextChange ");
                return false;
            }
        });

        return true;
    }

searchable.xml

<searchable xmlns:android="http://schemas.android.com/apk/res/android"
                                      android:label="@string/app_name"
                                      android:hint="@string/search_hint"/>

和menu.xml中的"SearchBar"

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

...

最后,但并非最不重要的,清单(但这应该是清楚的)......

  <activity
        android:name=".activities.MainActivity"
        android:label="@string/title_activity_main">
        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable"/>
    </activity>

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