Detailed explanation of the use of Androidselector background selector

In developing applications, in many cases it is necessary to design the background of the listview or button control. Here is a summary of the usage of the android selector:
1. Configure the Android selector in the drawable.
Save the following XML file into a .xml file named by yourself (such as item_bg.xml), and place the file in the drawable file. When using the system, use the corresponding according to the status of the list items in the ListView. Background picture.

2. Use the above configuration file:
The first method is to configure it in the listview configuration file, the code is as follows: android:listSelector="@drawable/item_bg"
The second method It is to add attributes to the item in the listview. The code is as follows: android:background="@drawable/item_bg"
The third method is to set it in the java code. The code is as follows: Drawable drawable =getResources().getDrawable(R. drawable.item_bg);
ListView.setSelector(drawable);
The display effect of the above setting method is sometimes black, so you need to add the following code to the configuration file: android:cacheColorHint="@android:color/ transparent" makes its background transparent.
Similarly, Button also has some background effects. The following is an attribute explanation:
android:state_selected is to set the effect when selected.
android:state_focused is to set the effect of getting focus.
android:state_pressed is to set the effect of clicking. Effect
android:state_enabled is to set whether to respond to events
The following is a selector used to set the text state in the button. The code is as follows:

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