title: Button inside DrawerLayout is not clickable
body: <p>I've been searching for a while with this issue and i cant find solution yet.
  For my design of DrawerLayout, I will not be using listview but linearlayout as container for my views. I test it first by adding a button inside the linearlayout but i cant click it.
  Heres the XML.</p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/drawer_layout"
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
  &lt;LinearLayout
          android:id="@+id/left_drawer"
          android:background="@color/white"
          android:orientation="vertical"
          android:layout_gravity="start"
          android:layout_width="250dp"
          android:layout_height="match_parent"&gt;
      &lt;Button
              android:id="@+id/btn_test"
              android:text="TEST"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"/&gt;
      &lt;EditText
  
              android:layout_width="match_parent"
              android:layout_height="wrap_content"/&gt;
  
  &lt;/LinearLayout&gt;
  
  &lt;FrameLayout
          android:id="@+id/container_fragment2"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:layout_marginTop="1dp"
          android:layout_alignParentRight="true"
          android:layout_alignParentEnd="true"
          &gt;
  &lt;/FrameLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>In java, I also tried to put text in the button once it is being loaded and its working.The only thing that is not working is when i click it. the drawer will just close.</p>
  
  <pre><code>/**Init Drawer*/
  private void initDrawer(){
  
      mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
      mDrawerContainer = (LinearLayout) findViewById(R.id.left_drawer);
  
      //mDrawerContainer.setOnClickListener(new DrawerItemClickListener());
      mDrawerContainer.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              Toast.makeText(context,"initDrawer",Toast.LENGTH_SHORT).show();
          }
      });
  
      btn_test = (Button)mDrawerContainer.findViewById(R.id.btn_test);
      btn_test.setOnClickListener(new View.OnClickListener() { //this is not working,i cant click the button
          @Override
          public void onClick(View v) {
              Log.e("MyActivity","test");
              Toast.makeText(context,"test",Toast.LENGTH_SHORT).show();
          }
      });
      btn_test.setText("hooray"); //this one is working,it change the text to hooray once loaded
  
  
  }
  </code></pre>
  
  <p>Im looking forward for your input guys,</p>
  
  <p>Thanks a lot.</p>