关于dialog对话框中按键的点击事件选择

如果在dialog对话框中添加一个按钮，那么它对应的点击事件应该回调View.OnClickListener()方法呢还是DialogInterface.OnClickListener()方法呢？

 1 /* 创建对话框 */
 2 public void showdialog(String title, String message){
 3     AlertDialog.Builder builder = new Builder(this);
 4     builder.setIcon(R.drawable.ic_launcher);
 5     builder.setTitle(title);
 6     builder.setMessage(message);
 7     builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
 8             
 9             @Override
10             public void onClick(DialogInterface dialog, int which) {
11                 
12                 
13             }
14         });
15         builder.create().show();        
16                 
17 }

其实答案很简单，看下setPositiveButton的关联代码：

 1         /**
 2          * Set a listener to be invoked when the positive button of the dialog is pressed.
 3          * @param text The text to display in the positive button
 4          * @param listener The {@link DialogInterface.OnClickListener} to use.
 5          *
 6          * @return This Builder object to allow for chaining of calls to set methods
 7          */
 8         public Builder setPositiveButton(CharSequence text, final OnClickListener listener) {
 9             P.mPositiveButtonText = text;
10             P.mPositiveButtonListener = listener;
11             return this;
12         }

O(∩_∩)O代码中已经标注的很清楚了，这里的第二个param应该使用DialogInterface.OnClickListener，而针对View.OnClickListener和DialogInterface.OnClickListener的区别，来看看关联代码：

DialogInterface.OnClickListener

 1     /**
 2      * Interface used to allow the creator of a dialog to run some code when an
 3      * item on the dialog is clicked..
 4      */
 5     interface OnClickListener {
 6         /**
 7          * This method will be invoked when a button in the dialog is clicked.
 8          * 
 9          * @param dialog The dialog that received the click.
10          * @param which The button that was clicked (e.g.
11          *            {@link DialogInterface#BUTTON1}) or the position
12          *            of the item clicked.
13          */
14         /* TODO: Change to use BUTTON_POSITIVE after API council */
15         public void onClick(DialogInterface dialog, int which);
16     }

 

View.OnClickListener

 1     /**
 2      * Interface definition for a callback to be invoked when a view is clicked.
 3      */
 4     public interface OnClickListener {
 5         /**
 6          * Called when a view has been clicked.
 7          *
 8          * @param v The view that was clicked.
 9          */
10         void onClick(View v);
11     }

喏，写的很清楚了，一个是dialog中的button被clicked了调用，一个是View被clicked了回调。

理解这么多，后期再补充............

 

posted @ 2015-11-23 00:22  菜鸟学C  阅读(5979)  评论(0)  编辑  收藏  举报