Add the ability to specify the onClick handler with XML. The new android:onClick attribute defines the name of the method in the Activity to invoke when the button is clicked. The method has to be public and get one View parameter.

api/current.xml

@@ -5344,6 +5344,17 @@
  visibility="public"
 >
 </field>
+<field name="onClick"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="16843375"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
 <field name="oneshot"
  type="int"
  transient="false"

core/java/android/view/View.java

@@ -62,6 +62,8 @@ import com.android.internal.view.menu.MenuBuilder;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.lang.ref.SoftReference;
+import java.lang.reflect.Method;
+import java.lang.reflect.InvocationTargetException;
 
 /**
  * <p>
@@ -1874,6 +1876,36 @@ public class View implements Drawable.Callback, KeyEvent.Callback {
                 case R.styleable.View_minHeight:
                     mMinHeight = a.getDimensionPixelSize(attr, 0);
                     break;
+                case R.styleable.View_onClick:
+                    final String handlerName = a.getString(attr);
+                    if (handlerName != null) {
+                        setOnClickListener(new OnClickListener() {
+                            private Method mHandler;
+
+                            public void onClick(View v) {
+                                if (mHandler == null) {
+                                    try {
+                                        mHandler = getContext().getClass().getMethod(handlerName,
+                                                View.class);
+                                    } catch (NoSuchMethodException e) {
+                                        throw new IllegalStateException("Could not find a method " +
+                                                handlerName + "(View) in the activity", e);
+                                    }
+                                }
+
+                                try {
+                                    mHandler.invoke(getContext(), View.this);
+                                } catch (IllegalAccessException e) {
+                                    throw new IllegalStateException("Could not execute non "
+                                            + "public method of the activity", e);
+                                } catch (InvocationTargetException e) {
+                                    throw new IllegalStateException("Could not execute "
+                                            + "method of the activity", e);
+                                }
+                            }
+                        });
+                    }
+                    break;
             }
         }
 

core/res/res/values/attrs.xml

@@ -1165,6 +1165,13 @@
              enabled for events such as long presses. -->
         <attr name="hapticFeedbackEnabled" format="boolean" />
 
+        <!-- Name of the method in this View's context to invoke when the view is
+             clicked. This name must correspond to a public method that takes
+             exactly one parameter of type View. For instance, if you specify
+             <code>android:onClick="sayHello"</code>, you must declare a
+             <code>public void sayHello(View v)</code> method of your context
+             (typically, your Activity.)-->
+        <attr name="onClick" format="string" />
     </declare-styleable>
 
     <!-- Attributes that can be used with a {@link android.view.ViewGroup} or any

core/res/res/values/public.xml

@@ -1096,6 +1096,7 @@
    <public type="attr" name="density" id="0x0101026c" />
    <public type="attr" name="searchSuggestThreshold" id="0x0101026d" />
    <public type="attr" name="includeInGlobalSearch" id="0x0101026e" />
+   <public type="attr" name="onClick" id="0x0101026f" />
 
    <public type="anim" name="anticipate_interpolator" id="0x010a0007" />
    <public type="anim" name="overshoot_interpolator" id="0x010a0008" />