Android 代码不适用于shareactionprovider，但相同的代码适用于菜单选项

我正在使用shareactionprovider共享文本，但无法使其正常工作。相同的代码适用于菜单选项。当我使用shareactionprovider共享文本时，文本不会被共享，但当我使用菜单共享选项共享相同文本时，文本会被共享

对不起，我的英语很差

public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getActionBar().setDisplayHomeAsUpEnabled(true);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.share2, menu);
        menu.add(Menu.NONE, MENU_ITEM1, Menu.NONE, "Share");
        MenuItem mShareActionProviderItem = (MenuItem) menu.findItem(R.id.menu_share2);

        mShareActionProvider = (ShareActionProvider) mShareActionProviderItem.getActionProvider();

        Intent t = new Intent(Intent.ACTION_SEND);
        t.setAction(Intent.ACTION_SEND);
        t.setType("text/plain");
        CharSequence displayContents = contentsTextView.getText().toString();
        t.putExtra(Intent.EXTRA_TEXT,displayContents);
        mShareActionProvider.setShareIntent(t);
        return true;  
    }


    @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {



        case MENU_ITEM1:

                Intent shareIntent2 = new Intent();
                shareIntent2.setAction(Intent.ACTION_SEND);
                shareIntent2.setType("text/plain");
                CharSequence displayContents2 = contentsTextView.getText().toString();
                shareIntent2.putExtra(Intent.EXTRA_TEXT,displayContents2);
                startActivity(shareIntent2);
                break;




            }
            return super.onOptionsItemSelected(item);
     }

---

调用

onCreateOptions菜单（）

时，

contentsTextView

可能为空

而是在用户键入以下内容时更新

Intent

：

/***
  Copyright (c) 2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain        a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,        WITHOUT        WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
*/

package com.commonsware.android.sap;

import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.Toast;
import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.widget.ShareActionProvider;

public class MainActivity extends SherlockActivity implements
    ShareActionProvider.OnShareTargetSelectedListener, TextWatcher {
  private ShareActionProvider share=null;
  private Intent shareIntent=new Intent(Intent.ACTION_SEND);
  private EditText editor=null;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);

    shareIntent.setType("text/plain");
    editor=(EditText)findViewById(R.id.editor);
    editor.addTextChangedListener(this);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getSupportMenuInflater().inflate(R.menu.actions, menu);

    share=
        (ShareActionProvider)menu.findItem(R.id.share)
                                 .getActionProvider();
    share.setOnShareTargetSelectedListener(this);

    return(super.onCreateOptionsMenu(menu));
  }

  @Override
  public boolean onShareTargetSelected(ShareActionProvider source,
                                       Intent intent) {
    Toast.makeText(this, intent.getComponent().toString(),
                   Toast.LENGTH_LONG).show();

    return(false);
  }

  @Override
  public void afterTextChanged(Editable s) {
    shareIntent.putExtra(Intent.EXTRA_TEXT, s.toString());
    share.setShareIntent(shareIntent);
  }

  @Override
  public void beforeTextChanged(CharSequence s, int start, int count,
                                int after) {
    // ignored
  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before,
                            int count) {
    // ignored
  }
}

（如中所示）

FYI有一个（奇怪的）相关问题，有三个完全重复的问题，没有一个答案！