相关疑难解决方法(0)

我不知道为什么它出现为null,如果它必须对片段和片段标题或抽屉做一些事情,因为它是在这个片段被拉出的主要活动上.

这是我的菜单xml项目:

<?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/action_search"
        android:title="@string/action_search"
        android:icon="@drawable/ic_action_search"
        app:showAsAction="always"
        app:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

这是片段代码:

public class BrowseFragment extends Fragment {

    //action bar expands to search
    //search - keyword or tab search, title
    //include popular - same algorithm as home
    //show categories

    //category click takes you to grid activity
//adapter with custom model
    private CategoryViewerAdapter adapter;

    //list with custom model
    private List<CategoryItem> categoriesList;

    //List view
    private ListView categoryListView;

    //SearchView
    private SearchView search;

    @Override
    public void onCreateOptionsMenu(Menu menu, …

我只是一个初学者,我在这里搜索了这个问题,发现4-5问题但是没有帮助我.我只是在Actionbar中尝试searchView,我的活动是AppCompatActivity我的代码在下面.我在这个活动中使用工具栏.并使用这个库.OncreatOptionMenu:

 @Override
public boolean onCreateOptionsMenu(Menu menu) {

    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_main, menu);
    SearchManager SManager =  (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    MenuItem searchMenuItem = menu.findItem(R.id.action_search);
    SearchView searchViewAction = (SearchView) MenuItemCompat.getActionView(searchMenuItem);
    searchViewAction.setSearchableInfo(SManager.getSearchableInfo(getComponentName()));
    searchViewAction.setIconifiedByDefault(false);

    return super.onCreateOptionsMenu(menu);
}

XML:

<item android:id="@+id/action_search"
    android:title="action_search"
    MainActivity:showAsAction="ifRoom"
    MainActivity:actionViewClass="android.support.v7.widget.SearchView" />

和logcat:

java.lang.NullPointerException
        at algonation.com.spm.MainActivity.onCreateOptionsMenu(MainActivity.java:183)
        at android.app.Activity.onCreatePanelMenu(Activity.java:2571)
        at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:277)
        at android.support.v7.internal.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:84)
        at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallback.onCreatePanelMenu(AppCompatDelegateImplBase.java:251)
        at android.support.v7.internal.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:84)
        at android.support.v7.internal.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:449)
        at android.support.v7.internal.app.ToolbarActionBar$1.run(ToolbarActionBar.java:66)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:103)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:5292)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
        at dalvik.system.NativeStart.main(Native Method)

如果你需要MainActivity的完整代码,请告诉我..非常感谢你.

我尝试在android studio中使用Proguard,但似乎Proguard并没有混淆类名,例如,我的app结构和配置:

和配置

但是当我尝试在应用程序中触发异常时:

ADB控制台中列出了该异常:

只有方法被混淆,MainActivity.class不是

我在我的应用程序中实现搜索小部件时遇到问题.它似乎无法找到菜单项的"动作视图",但它正好找到该项目.

我四处寻找答案,并没有看到明确的解决方案.

这是我在XML中声明的菜单

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/group_search_box"
    android:title="@string/search_label"
    android:icon="@drawable/ic_action_action_search"
    app:showAsAction="ifRoom|collapseActionView"
    app:actionViewClass="android.support.v7.widget.SearchView" />

以下是它的实现方式.

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

这是我正在添加的库,也许我添加了一个不正确的库？

compile 'com.android.support:support-v4:+'
compile 'com.android.support:appcompat-v7:+'

最后这里是崩溃日志

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.SearchView.setSearchableInfo(android.app.SearchableInfo)' on a null object reference
        at com.example.myapp.fragments.GroupFragment.onCreateOptionsMenu(GroupFragment.java:88)
        at android.app.Fragment.performCreateOptionsMenu(Fragment.java:1780)
        at android.app.FragmentManagerImpl.dispatchCreateOptionsMenu(FragmentManager.java:1927)
        at android.app.Activity.onCreatePanelMenu(Activity.java:2539)
        at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
        at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:436)
        at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:800)
        at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:221)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
        at android.view.Choreographer.doCallbacks(Choreographer.java:574)
        at android.view.Choreographer.doFrame(Choreographer.java:543)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5017) …