Question

我正在尝试实现ShareActionProvider，但得到：

02-20 04:14:28.894: E/AndroidRuntime(1145): Process: com.learn2crack.tab, PID: 1145
02-20 04:14:28.894: E/AndroidRuntime(1145): java.lang.ClassCastException: android.support.v7.widget.ShareActionProvider cannot be cast to android.view.ActionProvider

menu.xml文件：

  <item
    android:id="@+id/share"
    android:title="@string/share"
    android:actionProviderClass="android.support.v7.widget.ShareActionProvider"
    android:showAsAction="always" />

我将其导入了我的班级：

    import android.support.v7.widget.ShareActionProvider;

完成日志：

02-20 04:14:28.894: E/AndroidRuntime(1145): FATAL EXCEPTION: main
02-20 04:14:28.894: E/AndroidRuntime(1145): Process: com.learn2crack.tab, PID: 1145
02-20 04:14:28.894: E/AndroidRuntime(1145): java.lang.ClassCastException: android.support.v7.widget.ShareActionProvider cannot be cast to android.view.ActionProvider
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.MenuInflater$MenuState.readItem(MenuInflater.java:374)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.MenuInflater.parseMenu(MenuInflater.java:160)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.MenuInflater.inflate(MenuInflater.java:110)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.learn2crack.tab.MainActivity.onCreateOptionsMenu(MainActivity.java:72)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.app.Activity.onCreatePanelMenu(Activity.java:2538)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:436)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:800)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:221)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.Choreographer.doCallbacks(Choreographer.java:574)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.Choreographer.doFrame(Choreographer.java:543)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.os.Handler.handleCallback(Handler.java:733)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.os.Handler.dispatchMessage(Handler.java:95)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.os.Looper.loop(Looper.java:136)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at android.app.ActivityThread.main(ActivityThread.java:5017)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at java.lang.reflect.Method.invokeNative(Native Method)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at java.lang.reflect.Method.invoke(Method.java:515)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-20 04:14:28.894: E/AndroidRuntime(1145):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

更改为

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
     <item
      android:id="@+id/share"
      android:title="@string/share"
      yourapp:actionProviderClass="android.support.v7.widget.ShareActionProvider"
      yourapp:showAsAction="always" />
    ...
</menu>

检查主题使用ShareActionProvider

http://developer.android.com/guide/topics/ui/actionbar.html

Answer 2

它对我有用。Git Hub link

添加这个你的java类：

import android.widget.ShareActionProvider;
......
private ShareActionProvider m_provider;
......
{
  m_provider = (ShareActionProvider)menu_item.getActionProvider();
}

将此添加到您的menu.xml：

android:actionProviderClass="android.widget.ShareActionProvider"

Answer 3

我在关注Adding an Easy Share Action时遇到了这个问题在 Android开发人员指南。

事实证明，在比Android 4.0更平台的平台上，SharedActionProvider需要与v7 compat支持库 android.support.v7.widget.ShareActionProvider 一起使用，这意味着你需要：

import android.support.v7.widget.ShareActionProvider;

在您的Activity java文件中。

但实际上在Android 4.0之后，可以使用ShareActionProvider android.widget.ShareActionProvider 。因此导入应该是：

import android.widget.ShareActionProvider;

您的问题是：在 menu.xml 中您使用了android.support.v7.widget.ShareActionProvider，但在活动java文件中导入了android.support.v7.widget.ShareActionProvider。因此，只需将它们更改为同一个就可以解决问题，android.support.v7.widget.ShareActionProvider（如果你的minSDK＆lt; 14）或android.widget.ShareActionProvider（如果你的minSDK＆gt; = 14）都可以。

ClassCastException：android.support.v7.widget.ShareActionProvider

3 个答案: