如果showAsAction ="always"，则Support.v7 ShareActionProvider崩溃. [英] support.v7 ShareActionProvider crashes if showAsAction="always"
本文介绍了如果showAsAction ="always"，则Support.v7 ShareActionProvider崩溃.的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
尝试使用支持库(v7)中的 ShareActionProvider ，如果我未为菜单项设置 showAsAction 属性，则我的应用程序可以正常运行.我的意图是将此菜单项显示为图标而不是溢出项.
Trying to use ShareActionProvider from the support library (v7), my app works fine if I don't set the showAsAction attribute for the menu item. My intention is to display this menu item as an icon and not as an overflow item.
但是，如果我将其设置为始终显示，则应用程序崩溃，并显示 NullPointerException .
If, however, I set it to show always, the app crashes with NullPointerException.
07-30 01:23:37.778: E/AndroidRuntime(25853): java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageDrawable(android.graphics.drawable.Drawable)' on a null object reference
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.internal.widget.ActivityChooserView.updateAppearance(ActivityChooserView.java:510)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.internal.widget.ActivityChooserView$3.onChanged(ActivityChooserView.java:247)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.internal.widget.ActivityChooserView$ActivityChooserViewAdapter.setDataModel(ActivityChooserView.java:647)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.internal.widget.ActivityChooserView.setActivityChooserModel(ActivityChooserView.java:260)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.widget.ShareActionProvider.onCreateActionView(ShareActionProvider.java:182)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v4.view.ActionProvider.onCreateActionView(ActionProvider.java:109)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.support.v7.internal.view.menu.MenuItemWrapperJB$ActionProviderWrapperJB.onCreateActionView(MenuItemWrapperJB.java:44)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.MenuItemImpl.getActionView(MenuItemImpl.java:583)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.ActionMenuPresenter.getItemView(ActionMenuPresenter.java:161)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.ActionMenuPresenter.flagActionItems(ActionMenuPresenter.java:438)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.MenuBuilder.flagActionItems(MenuBuilder.java:1062)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.BaseMenuPresenter.updateMenuView(BaseMenuPresenter.java:87)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.ActionMenuPresenter.updateMenuView(ActionMenuPresenter.java:216)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.MenuBuilder.dispatchPresenterUpdate(MenuBuilder.java:244)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.MenuBuilder.onItemsChanged(MenuBuilder.java:956)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.view.menu.MenuBuilder.startDispatchingItemsChanged(MenuBuilder.java:979)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:479)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:800)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:221)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.view.Choreographer.doFrame(Choreographer.java:543)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.os.Handler.handleCallback(Handler.java:733)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.os.Handler.dispatchMessage(Handler.java:95)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.os.Looper.loop(Looper.java:136)
07-30 01:23:37.778: E/AndroidRuntime(25853): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-30 01:23:37.778: E/AndroidRuntime(25853): at java.lang.reflect.Method.invoke(Native Method)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-30 01:23:37.778: E/AndroidRuntime(25853): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
我的菜单布局:main.xml
My menu layout: main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.myapp.MainActivity" >
<item
android:id="@+id/menu_item_share"
android:title="Share"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider"
app:showAsAction="always"/>
</menu>
我在活动中的通货膨胀代码:
My inflation code in the activity:
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.ShareActionProvider;
public class MainActivity extends ActionBarActivity
{
...
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
// Locate MenuItem with ShareActionProvider
MenuItem item = menu.findItem(R.id.menu_item_share);
// Fetch and store ShareActionProvider
_shareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
setShareIntent();
return true;
}
}
谢谢.
推荐答案
今天我已经遇到了这个问题，这是一个支持v7 lib的bug.
Today I have met this problem, this is a support v7 lib bug.
如果您必须使用支持v7库，我发现了两种解决此问题的方法.
I found two ways to solve this problem if you have to use support v7 lib.
-
将您的支持库更新为最新版本.当前最新的是android 5.0 v7 lib，我已经测试过该lib可以修复此错误.
update your support lib to the latest version. the current latest is android 5.0 v7 lib, I have test this lib have fix this bug.
如果您不想更新支持v7 lib，则应在共享项目菜单xml中将app:showAsAction更改为android:showAsAction.我花了很多时间来找到这个解决方案.
If you don't want to update support v7 lib, you should change app:showAsAction to android:showAsAction in your share item menu xml. I spend lots of time to found this solution.
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