Merge "docs: add more info about state list drawable and onclick attribute to Button bug:1062898" into froyo

core/java/android/widget/Button.java

@@ -25,13 +25,13 @@ import android.widget.RemoteViews.RemoteView;
 
 
 /**
- * <p>
+ * Represents a push-button widget. Push-buttons can be
- * <code>Button</code> represents a push-button widget. Push-buttons can be
+ * pressed, or clicked, by the user to perform an action.
- * pressed, or clicked, by the user to perform an action. A typical use of a
+
- * push-button in an activity would be the following:
+ * <p>A typical use of a push-button in an activity would be the following:
  * </p>
  *
- * <pre class="prettyprint">
+ * <pre>
  * public class MyActivity extends Activity {
  *     protected void onCreate(Bundle icicle) {
  *         super.onCreate(icicle);
@@ -45,11 +45,47 @@ import android.widget.RemoteViews.RemoteView;
  *             }
  *         });
  *     }
- * }
+ * }</pre>
- * </pre>
  *
- * <p>See the <a href="{@docRoot}resources/tutorials/views/hello-formstuff.html">Form Stuff
+ * <p>However, instead of applying an {@link android.view.View.OnClickListener OnClickListener} to
- * tutorial</a>.</p>
+ * the button in your activity, you can assign a method to your button in the XML layout,
+ * using the {@link android.R.attr#onClick android:onClick} attribute. For example:</p>
+ *
+ * <pre>
+ * &lt;Button
+ *     android:layout_height="wrap_content"
+ *     android:layout_width="wrap_content"
+ *     android:text="@string/self_destruct"
+ *     android:onClick="selfDestruct" /&gt;</pre>
+ *
+ * <p>Now, when a user clicks the button, the Android system calls the activity's {@code
+ * selfDestruct(View)} method. In order for this to work, the method must be public and accept
+ * a {@link android.view.View} as its only parameter. For example:</p>
+ *
+ * <pre>
+ * public void selfDestruct(View view) {
+ *     // Kabloey
+ * }</pre>
+ *
+ * <p>The {@link android.view.View} passed into the method is a reference to the widget
+ * that was clicked.</p>
+ *
+ * <h3>Button style</h3>
+ *
+ * <p>Every Button is styled using the system's default button background, which is often different
+ * from one device to another and from one version of the platform to another. If you're not
+ * satisfied with the default button style and want to customize it to match the design of your
+ * application, then you can replace the button's background image with a <a
+ * href="{@docRoot}guide/topics/resources/drawable-resource.html#StateList">state list drawable</a>.
+ * A state list drawable is a drawable resource defined in XML that changes its image based on
+ * the current state of the button. Once you've defined a state list drawable in XML, you can apply
+ * it to your Button with the {@link android.R.attr#background android:background}
+ * attribute. For more information and an example, see <a
+ * href="{@docRoot}guide/topics/resources/drawable-resource.html#StateList">State List
+ * Drawable</a>.</p>
+ *
+ * <p>Also see the <a href="{@docRoot}resources/tutorials/views/hello-formstuff.html">Form Stuff
+ * tutorial</a> for an example implementation of a button.</p>
  *
  * <p><strong>XML attributes</strong></p>
  * <p>

docs/html/guide/topics/resources/drawable-resource.jd

@@ -729,12 +729,12 @@ default value should always be last (as demonstrated in the following example).<
 &lt;/selector>
 </pre>
 
-<p>This layout XML applies the drawable to a View:</p>
+<p>This layout XML applies the state list drawable to a Button:</p>
 <pre>
-&lt;ImageView
+&lt;Button
     android:layout_height="wrap_content"
     android:layout_width="wrap_content"
-    android:src="@drawable/button" />
+    android:background="@drawable/button" />
 </pre>
 </dd> <!-- end example -->