title: How to activate "Share" button in android app?
body: <p>i want to add "Share" button to my android app. </p>
  
  <p>Like that</p>
  
  <p><img src="https://i.stack.imgur.com/eZ1LQ.jpg" alt=":"></p>
  
  <p>I added "Share" button, but button is not active. I click, but nothing happens.</p>
  
  <p>My code in MainActivity.java:</p>
  
  <pre><code>private ShareActionProvider mShareActionProvider;
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.share_menu, menu);
      getMenuInflater().inflate(R.menu.main, menu);
      MenuItem item = menu.findItem(R.id.share_menu);
      mShareActionProvider = (ShareActionProvider) menu.findItem(R.id.share_menu).getActionProvider();
      mShareActionProvider.setShareIntent(getDefaultShareIntent());
  
      return true;
  }
  
  {
      Intent sharingIntent = new Intent(Intent.ACTION_SEND);
      sharingIntent.setType("text/plain");
      sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Text");
      sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Subject");
      startActivity(Intent.createChooser(sharingIntent, "Share using"));
  }
  </code></pre>
  
  <p>I want to share text in my first tab (first_tab.xml) or second tab (second_tab.xml).</p>
  
  <p>Code in tab (xml) (If need):</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@color/background_color"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context=".MainActivity$DummySectionFragment" &gt;
  
  &lt;TextView
      android:id="@+id/section_label1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_centerVertical="true"
      android:text="@string/text"
      android:textColor="@color/text_color" /&gt;
  
  &lt;ImageView
      android:id="@+id/imageView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_centerHorizontal="true"
      android:src="@drawable/sprite" /&gt;
  </code></pre>
  
  <p></p>