title: Could not find class 'android.support.v4.widget.SwipeRefreshLayout'
body: <p>I keep getting this error and it's causing my app to crash. Trying to implement the new v4 swipe refresh layout. I have updated the support library + sdk. What is the issue?</p>
  
  <p><strong>Could not find class 'android.support.v4.widget.SwipeRefreshLayout', referenced from method ......onCreate</strong></p>
  
  <pre><code>import android.support.v4.widget.SwipeRefreshLayout;
  ...
  private SwipeRefreshLayout swipeLayout;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.home_page_list);
  swipeLayout = (SwipeRefreshLayout) findViewById(R.id.container);
      swipeLayout.setColorScheme(android.R.color.holo_blue_bright, 
              android.R.color.holo_green_light, 
              android.R.color.holo_orange_light, 
              android.R.color.holo_red_light);
      swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
          @Override
          public void onRefresh() {
              swipeLayout.setRefreshing(false);
          }
      });
  </code></pre>
  
  <p>XML</p>
  
  <pre><code>&lt;android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/container"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="com.devrim.ythaber.HomeActivity"
  tools:ignore="MergeRootFrame" &gt;
  
  &lt;ScrollView
      android:layout_width="match_parent"
      android:layout_height="wrap_content" &gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical" &gt;
  
          &lt;ImageView
              android:id="@+id/thumb"
              android:layout_width="100dp"
              android:layout_height="100dp"
              android:contentDescription="@string/app_name" /&gt;
  
          &lt;RelativeLayout
              android:id="@+id/relativeLayout1"
              android:layout_width="wrap_content"
              android:layout_height="290dp"
              android:layout_centerVertical="true"
              android:layout_marginLeft="5dp"
              android:layout_marginRight="5dp"
              android:orientation="vertical" &gt;
  
              &lt;!-- android:layout_toRightOf="@+id/thumb" --&gt;
  
          &lt;/RelativeLayout&gt;
  
          &lt;TextView
              android:id="@+id/title"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_gravity="left"
              android:ellipsize="end"
              android:fontFamily="sans-serif-light"
              android:maxLines="2"
              android:shadowColor="@color/dropshadow"
              android:shadowDx="2"
              android:shadowDy="2"
              android:shadowRadius="2"
              android:text="@string/title"
              android:textAllCaps="false"
              android:textAppearance="?android:attr/textAppearanceSmallPopupMenu"
              android:textColor="@color/titlecolour"
              android:textSize="35sp"
              android:textStyle="italic"
              android:typeface="sans" &gt;
          &lt;/TextView&gt;
  
          &lt;TextView
              android:id="@+id/category"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:layout_below="@+id/title"
              android:ellipsize="end"
              android:fontFamily="sans-serif-light"
              android:gravity="right"
              android:maxLines="1"
              android:paddingRight="5dp"
              android:paddingTop="10dp"
              android:textAppearance="?android:attr/textAppearanceSmallPopupMenu"
              android:textColor="@color/catcolour"
              android:textSize="17sp"
              android:textStyle="italic"
              android:typeface="sans" &gt;
          &lt;/TextView&gt;
      &lt;/LinearLayout&gt;
  &lt;/ScrollView&gt;
  &lt;/android.support.v4.widget.SwipeRefreshLayout&gt;
  </code></pre>
  
  <p>Complete logcat:</p>
  
  <pre><code>05-01 21:31:27.390: W/dalvikvm(11452): VFY: unable to find class referenced in signature (Landroid/support/v4/widget/SwipeRefreshLayout;)
  05-01 21:31:27.390: E/dalvikvm(11452): Could not find class 'android.support.v4.widget.SwipeRefreshLayout', referenced from method com.devrim.ythaber.HomeActivity.onCreate
  05-01 21:31:27.390: W/dalvikvm(11452): VFY: unable to resolve check-cast 619 (Landroid/support/v4/widget/SwipeRefreshLayout;) in Lcom/devrim/ythaber/HomeActivity;
  05-01 21:31:27.390: W/dalvikvm(11452): Link of class 'Lcom/devrim/ythaber/HomeActivity$1;' failed
  05-01 21:31:27.440: W/dalvikvm(11452): threadid=1: thread exiting with uncaught exception (group=0x4166ee18)
  05-01 21:31:27.440: E/AndroidRuntime(11452): FATAL EXCEPTION: main
  05-01 21:31:27.440: E/AndroidRuntime(11452): Process: com.devrim.ythaber, PID: 11452
  05-01 21:31:27.440: E/AndroidRuntime(11452): java.lang.NoClassDefFoundError: android.support.v4.widget.SwipeRefreshLayout
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at com.devrim.ythaber.HomeActivity.onCreate(HomeActivity.java:56)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.Activity.performCreate(Activity.java:5312)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.ActivityThread.access$800(ActivityThread.java:156)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.os.Handler.dispatchMessage(Handler.java:102)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.os.Looper.loop(Looper.java:157)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at android.app.ActivityThread.main(ActivityThread.java:5872)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at java.lang.reflect.Method.invokeNative(Native Method)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at java.lang.reflect.Method.invoke(Method.java:515)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1069)
  05-01 21:31:27.440: E/AndroidRuntime(11452):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:885)
  </code></pre>