Android Development Point drip--some basic but useful knowledge (2)

1.onItemLongClick and Onitemclick event interception

When you need to get an entry for a ListView in both long press events (Onitemlongclick) and click events (Onitemclick), justreturn to True in the Onitemlongclick event trigger function.

2. Customizing the checkbox style

In the layout file, add a property to Android:button, say no more, directly on the code

  <checkbox                        android:id= "@+id/xxx"                        android:layout_width= "wrap_content"                        android:layout_height= "wrap _content "                        android:layout_marginright=" 5DP "                        android:button=" @drawable/checkbox_selector "                        android: text= "xxx"                        />

Checkbox_selector.xml

<?xml version= "1.0" encoding= "Utf-8"? ><selector xmlns:android= "http://schemas.android.com/apk/res/ Android ">    <item android:state_checked=" true "                android:drawable=" @drawable/checkbox_selected_ Selector "/>    <item android:state_checked=" false "        android:drawable=" @drawable/checkbox_blank_ Selector "/></selector>

Checkbox_selected_selector.xml

<?xml version= "1.0" encoding= "Utf-8"? ><selector xmlns:android= "http://schemas.android.com/apk/res/ Android ">    <item android:state_pressed=" true "                android:drawable=" @drawable/checkbox_ya "/>    <item android:state_pressed= "false"        android:drawable= "@drawable/checkbox_yz"/></selector>

Checkbox_blank_selector.xml

<?xml version= "1.0" encoding= "Utf-8"? ><selector xmlns:android= "http://schemas.android.com/apk/res/ Android ">    <item android:state_pressed=" true "                android:drawable=" @drawable/checkbox_wa "/>    <item android:state_pressed= "false"        android:drawable= "@drawable/checkbox_wz"/></selector>

Focus issue with button or checkbox in Item 3.ListView

When customizing a ListView, each item has a button component or other component that can also be clicked (usually a button and a checkbox) on the other, since the focus is obtained by the button component, Then clicking on item is actually the equivalent of clicking on the button component.

Workaround: Add in the root layout of item

Android:descendantfocusability= "Blocksdescendants"

There is also a way to add a button component

Android:focusable= "false"