title: How to select and choose a ImageView from a toolbar with one touch/click event?
body: <p>I have a bar layout with four ImageViews.</p>
  
  <p>The code is showed below</p>
  
  <pre><code>&lt;LinearLayout
      android:id="@+id/layout"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" 
      android:layout_alignParentRight="true"
      android:layout_alignParentBottom="true"
      android:orientation="vertical" &gt;
  
      &lt;LinearLayout
          android:id="@+id/contact_bar_layout"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_above="@+id/contact2"
          android:orientation="vertical"
          android:visibility="gone" &gt;
  
              &lt;ImageView
                  android:id="@+id/contact"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_weight="1"
                  android:src="@drawable/contact_phone_state" /&gt;
  
              &lt;ImageView
                  android:id="@+id/contact_call"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_weight="1"
                  android:src="@drawable/contactcall_state" /&gt;
  
              &lt;ImageView
                  android:id="@+id/contact_call2"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:layout_weight="1"
                  android:src="@drawable/contact_phone_state" /&gt;
  
      &lt;/LinearLayout&gt;
  
      &lt;ImageView
              android:id="@+id/contact_bar_trigger"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:layout_alignParentRight="true"
              android:src="@drawable/contact_phone_state" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>At first the ImageView(contact_bar_trigger) would be showed on the screen only, </p>
  
  <p>after touch(keep action_down) it, the LinearLayout(contact_bar_layout) will show up, </p>
  
  <p>and the problem comes, is it possible to choose one ImageView from contact_bar by the touch motionevent action_up?</p>
  
  <p>if not, please give me some suggestion to implement this. Thank you~~</p>