异常：不支持，使用 MenuItemCompat.getActionProvider()

Question

我正在尝试在 Android 应用程序的操作栏中制作 "Share" 按钮。这是我的代码：

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ShareActionProvider;
import android.widget.TextView;

和片段部分：

{
private String mForecastText;

public PlaceholderFragment() {
    setHasOptionsMenu(true);
}

private Intent sharedIntentMaker(){
    Intent shareIntent = new Intent(Intent.ACTION_SEND);
    shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    shareIntent.setType("text/plain");
    shareIntent.putExtra(Intent.EXTRA_TEXT, mForecastText + "#SunshineApp");
    return shareIntent;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_detail, menu);
    MenuItem menuItem = menu.findItem(R.id.menu_action_share);
    ShareActionProvider mShareActionProvider = (ShareActionProvider) menuItem.getActionProvider();
    mShareActionProvider.setShareIntent(sharedIntentMaker());

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_detail, container, false);

    TextView textIntent = (TextView) rootView.findViewById(R.id.textIntent);
    Intent intent = getActivity().getIntent();
    mForecastText = intent.getStringExtra("INT_PS");
    textIntent.setText(mForecastText);
    return rootView;
}

当我运行我的应用程序在模拟器甚至真实设备上时，我得到异常：

AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.UnsupportedOperationException: This is not supported, use MenuItemCompat.getActionProvider()

它链接到 onCreateOptionsMenu() 的字符串：

ShareActionProvider mShareActionProvider = (ShareActionProvider) menuItem.getActionProvider();
mShareActionProvider.setShareIntent(sharedIntentMaker());

我做错了什么？

P.S.: 来自 logcat:

的错误堆栈跟踪

01-11 13:03:17.490 2331-2331/com.*****.*****.***** E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.*****.*****.*****, PID: 2331

java.lang.UnsupportedOperationException: This is not supported, use MenuItemCompat.getActionProvider()

        at android.support.v7.internal.view.menu.MenuItemImpl.getActionProvider(MenuItemImpl.java:645)
        at com.project.malina.sunsine.DetailActivity$PlaceholderFragment.onCreateOptionsMenu(DetailActivity.java:70)
        at android.support.v4.app.Fragment.performCreateOptionsMenu(Fragment.java:1868)
        at android.support.v4.app.FragmentManagerImpl.dispatchCreateOptionsMenu(FragmentManager.java:1989)
        at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:276)
        at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:276)
        at android.support.v7.app.ActionBarActivityDelegate.onCreatePanelMenu(ActionBarActivityDelegate.java:79)
        at android.support.v7.app.ActionBarActivityDelegateBase.preparePanel(ActionBarActivityDelegateBase.java:979)
        at android.support.v7.app.ActionBarActivityDelegateBase.doInvalidatePanelMenu(ActionBarActivityDelegateBase.java:1182)
        at android.support.v7.app.ActionBarActivityDelegateBase.access0(ActionBarActivityDelegateBase.java:79)
        at android.support.v7.app.ActionBarActivityDelegateBase.run(ActionBarActivityDelegateBase.java:115)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Answer 1

首先，您不能将 android.widget.ShareActionProvider 与 appcompat-v7 操作栏向后移植（例如，ActionBarActivity）一起使用。使用 ShareActionProvider 的 appcompat-v7 版本，或者将所有内容移至本机操作栏。

其次，如果您坚持使用 appcompat-v7，那么您就不能安全地使用 getActionProvider()，因为该方法在 API 级别 10 及以下不存在。将 menuItem.getActionProvider() 替换为 MenuItemCompat.getActionProvider(menuItem).

FWIW，here is a sample project 实现了 ShareActionProvider 的 appcompat-v7 版本。

Answer 2

您可以按照下面 link 中 Google 的代码示例中的模式进行操作。 https://github.com/googlesamples/android-ActionBarCompat-ShareActionProvider

最简单的方法是转到您的 Android Studio => 文件，导入示例。然后输入 "Share Action Provider".

下面是使用带有 ActionBarCompat 的 ShareActionProvider 创建共享操作菜单项所涉及的代码，向后兼容 API v7。

MainActivity.java

// BEGIN_INCLUDE(get_sap)
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu resource
    getMenuInflater().inflate(R.menu.main_menu, menu);

    // Retrieve the share menu item
    MenuItem shareItem = menu.findItem(R.id.menu_share);

    // Now get the ShareActionProvider from the item
    mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(shareItem);

    // Get the ViewPager's current item position and set its ShareIntent.
    int currentViewPagerItem = ((ViewPager) findViewById(R.id.viewpager)).getCurrentItem();
    setShareIntent(currentViewPagerItem);

    return super.onCreateOptionsMenu(menu);
}
// END_INCLUDE(get_sap

private void setShareIntent(int position) {
    // BEGIN_INCLUDE(update_sap)
    if (mShareActionProvider != null) {
        // Get the currently selected item, and retrieve it's share intent
        ContentItem item = mItems.get(position);
        Intent shareIntent = item.getShareIntent(MainActivity.this);

        // Now update the ShareActionProvider with the new share intent
        mShareActionProvider.setShareIntent(shareIntent);
    }
    // END_INCLUDE(update_sap)
}

main_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:support="http://schemas.android.com/apk/res-auto">

<!--
  To use ShareActionProvider provided by ActionBarCompat, we reference the class by set the
  support:actionProviderClass attribute with the full class name of ShareActionProvider.
-->
<item
    android:id="@+id/menu_share"
    android:title="@string/menu_share"
    support:actionProviderClass="android.support.v7.widget.ShareActionProvider"
    support:showAsAction="always" />

Answer 3

按照以下步骤操作：

Step.1) 要向 activity 添加 "share" 操作，请在应用栏的菜单资源中放置 ShareActionProvider。像这样

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

请注意actionProviderClass

Step.2) 现在你要确保在你的 Activity Java Class 中导入相同的 ShareActionProvider

import android.support.v7.widget.ShareActionProvider;

步骤.3)
onCreate 方法

的下方部分

        MenuInflater inflater = getMenuInflater();

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

        ShareActionProvider shareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(menu.findItem(R.id.actionbar_share));
        shareActionProvider.setShareIntent(shareIt());

意图方法

    private Intent shareIt() {
        Intent intent= new Intent(Intent.ACTION_SEND);
        intent.setType("text/plain");

        String shareMsgBody = "Hello, Share this with world !!";

        intent.putExtra(Intent.EXTRA_TEXT, shareAndPromotionBody);
        startActivity(Intent.createChooser(intent, "Spread the message!!"));
        return intent;
    }

异常：不支持，使用 MenuItemCompat.getActionProvider()

Exception: This is not supported, use MenuItemCompat.getActionProvider()

sdk

android

button

android-actionbar

android-studio