docs: Clarified how to find out when a switch is toggled

Per Chris, the existing doc was incorrect: you *can't* check for a
button press and a switch flip the same way. (The button triggers a
click event, but the switch does not.) Chris suggested that we just
remove the reference to onClick and suggest using a listener for
both kinds of buttons (ToggleButton and Switch).

Also pulled one note out of a section where it didn't fit (the bit
about changing a button/switch's state programmatically didn't have
much to do with listening for clicks) and put it at the top, and I
fixed a Javadoc typo for a relevant class that I happened to notice.

See first comment for doc stage location.

bug: 20625504
Change-Id: I9c8975111381e5b169f6a61454ef3a93da635759

Author: asolovay

core/java/android/widget/Switch.java

@@ -57,7 +57,7 @@
  * {@link #setTextAppearance(android.content.Context, int) textAppearance} and the related
  * setTypeface() methods control the typeface and style of label text, whereas the
  * {@link #setSwitchTextAppearance(android.content.Context, int) switchTextAppearance} and
- * the related seSwitchTypeface() methods control that of the thumb.
+ * the related setSwitchTypeface() methods control that of the thumb.
  *
  * <p>See the <a href="{@docRoot}guide/topics/ui/controls/togglebutton.html">Toggle Buttons</a>
  * guide.</p>

docs/html/guide/topics/ui/controls/togglebutton.jd

@@ -6,16 +6,15 @@ page.tags=switch,togglebutton
 <div id="qv">
 <h2>In this document</h2>
 <ol>
-  <li><a href="#HandlingEvents">Responding to Click Events</a>
-    <ol>
-      <li><a href="#ClickListener">Using an OnCheckedChangeListener</a></li>
-    </ol>
+  <li>
+    <a href="#ClickListener">Responding to Button Presses</a>
   </li>
 </ol>
   <h2>Key classes</h2>
   <ol>
     <li>{@link android.widget.ToggleButton}</li>
     <li>{@link android.widget.Switch}</li>
+    <li>{@link android.widget.CompoundButton}</li>
   </ol>
 </div>
 </div>
@@ -26,6 +25,12 @@ page.tags=switch,togglebutton
 object. Android 4.0 (API level 14) introduces another kind of toggle button called a switch that
 provides a slider control, which you can add with a {@link android.widget.Switch} object.</p>
 
+<p>
+  If you need to change a button's state yourself, you can use the {@link
+  android.widget.CompoundButton#setChecked CompoundButton.setChecked()} or
+  {@link android.widget.CompoundButton#toggle CompoundButton.toggle()} methods.
+</p>
+
 <div style="float:left;width:200px">
 <img src="{@docRoot}images/ui/togglebutton.png" alt="" />
 <p class="img-caption"><em>Toggle buttons</em></p>
@@ -36,78 +41,15 @@ provides a slider control, which you can add with a {@link android.widget.Switch
 <p class="img-caption"><em>Switches (in Android 4.0+)</em></p>
 </div>
 
-<p style="clear:left">The {@link android.widget.ToggleButton} and {@link android.widget.Switch}
-controls are subclasses of {@link android.widget.CompoundButton} and function in the same manner, so
-you can implement their behavior the same way.</p>
-
-<h2 id="HandlingEvents">Responding to Click Events</h2>
-
-<p>When the user selects a {@link android.widget.ToggleButton} and {@link android.widget.Switch},
-the object receives an on-click event.</p>
-
-<p>To define the click event handler, add the <code><a
-href="/reference/android/R.attr.html#onClick">android:onClick</a></code> attribute to the
-<code>&lt;ToggleButton&gt;</code> or <code>&lt;Switch&gt;</code> element in your XML
-layout. The value for this attribute must be the name of the method you want to call in response
-to a click event. The {@link android.app.Activity} hosting the layout must then implement the
-corresponding method.</p>
-
-<p>For example, here's a {@link android.widget.ToggleButton} with the <code><a
-href="/reference/android/R.attr.html#onClick">android:onClick</a></code> attribute:</p>
-
-<pre>
-&lt;ToggleButton 
-    android:id="@+id/togglebutton"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:textOn="Vibrate on"
-    android:textOff="Vibrate off"
-    android:onClick="onToggleClicked"/>
-</pre>
-
-<p>Within the {@link android.app.Activity} that hosts this layout, the following method handles the
-click event:</p>
-
-<pre>
-public void onToggleClicked(View view) {
-    // Is the toggle on?
-    boolean on = ((ToggleButton) view).isChecked();
-    
-    if (on) {
-        // Enable vibrate
-    } else {
-        // Disable vibrate
-    }
-}
-</pre>
-
-<p>The method you declare in the {@link android.R.attr#onClick android:onClick} attribute
-must have a signature exactly as shown above. Specifically, the method must:</p>
-<ul>
-  <li>Be public</li>
-  <li>Return void</li>
-  <li>Define a {@link android.view.View} as its only parameter (this will be the {@link
-android.view.View} that was clicked)</li>
-</ul>
-
-<p class="note"><strong>Tip:</strong> If you need to change the state
-yourself,
-use the {@link android.widget.CompoundButton#setChecked(boolean)} or {@link
-android.widget.CompoundButton#toggle()} method to change the state.</p>
-
-
-
-<h3 id="ClickListener">Using an OnCheckedChangeListener</h3>
-
-<p>You can also declare a click event handler programmatically rather than in an XML layout. This
-might be necessary if you instantiate the {@link android.widget.ToggleButton} or {@link
-android.widget.Switch} at runtime or you need to
-declare the click behavior in a {@link android.app.Fragment} subclass.</p>
+<h2 id="ClickListener">Responding to Button Presses</h2>
 
-<p>To declare the event handler programmatically, create an {@link
-android.widget.CompoundButton.OnCheckedChangeListener} object and assign it to the button by calling
-{@link
-android.widget.CompoundButton#setOnCheckedChangeListener}. For example:</p>
+<p>
+  To detect when the user activates the button or switch, create an {@link
+  android.widget.CompoundButton.OnCheckedChangeListener} object and assign it
+  to the button by calling {@link
+  android.widget.CompoundButton#setOnCheckedChangeListener
+  setOnCheckedChangeListener()}. For example:
+</p>
 
 <pre>
 ToggleButton toggle = (ToggleButton) findViewById(R.id.togglebutton);