android中的ImageButton

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/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.widget; import android.content.Context; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityNodeInfo; import android.widget.RemoteViews.RemoteView; import java.util.Map; / *  * Displays a button with an image (instead of text) that can be pressed * or clicked by the user. By default, an ImageButton looks like a regular * {@link android.widget.Button}, with the standard button background * that changes color during different button states. The image on the surface * of the button is defined either by the {@code android:src} attribute in the * {@code         } XML element or by the * {@link #setImageResource(int)} method.    
 * * To remove the standard button background image, define your own * background image or set the background color to be transparent.
 * To indicate the different button states (focused, selected, etc.), you can * define a different image for each state. E.g., a blue image by default, an * orange one for when focused, and a yellow one for when pressed. An easy way to * do this is with an XML drawable "selector." For example:
 *  * 
    * 
   
     * 
     
     * 
     
     * 
     
     * 
   
 * * 
Save the XML file in your project {@code res/drawable/} folder and then * reference it as a drawable for the source of your ImageButton (in the * {@code android:src} attribute). Android will automatically change the image * based on the state of the button and the corresponding images * defined in the XML.
 * * 
The order of the {@code
   
     } elements is important because they are * evaluated in order. This is why the "normal" button image comes last, because * it will only be applied after {@code android:state_pressed} and {@code * android:state_focused} have both evaluated false.
   
 * * 
See the Buttons * guide.
 * * 
XML attributes
 * 
 * See {@link android.R.styleable#ImageView Button Attributes}, * {@link android.R.styleable#View View Attributes} * 
 */ @RemoteView public class ImageButton extends ImageView { public ImageButton(Context context) { this(context, null); } public ImageButton(Context context, AttributeSet attrs) { this(context, attrs, com.android.internal.R.attr.imageButtonStyle); } public ImageButton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setFocusable(true); } @Override protected boolean onSetAlpha(int alpha) { return false; } @Override public void onInitializeAccessibilityEvent(AccessibilityEvent event) { super.onInitializeAccessibilityEvent(event); event.setClassName(ImageButton.class.getName()); } @Override public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { super.onInitializeAccessibilityNodeInfo(info); info.setClassName(ImageButton.class.getName()); } }  
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