android ListItem 焦点获取问题
16lz
2021-01-23
通常Android提供给我们的ListItem布局不是我们需要，可能我们想在里面添加一些图片，按钮等等，但是这时候这些可以获得焦点的子控件将会提前获取焦点，从而Item没有了获取焦点的能力了，这时候我们需要设置子控件获取焦点的能力为false，但是如果子控件较多时，这样设置比较麻烦，我们可以在我们自定义的item的根属性下添加：android:descendantFocusability="blocksDescendants"这样item将会阻止子控件获取焦点。该属性还有其他两种可能："beforeDescendants"和"afterDescendants"。分别为在子控件之前和之后。
/** * This view will get focus before any of its descendants. */ public static final int FOCUS_BEFORE_DESCENDANTS = 0×20000; /** * This view will get focus only if none of its descendants want it. */ public static final int FOCUS_AFTER_DESCENDANTS = 0×40000; /** * This view will block any of its descendants from getting focus, even * if they are focusable. */ public static final int FOCUS_BLOCK_DESCENDANTS = 0×60000;
/** * This view will get focus before any of its descendants. */ public static final int FOCUS_BEFORE_DESCENDANTS = 0×20000; /** * This view will get focus only if none of its descendants want it. */ public static final int FOCUS_AFTER_DESCENDANTS = 0×40000; /** * This view will block any of its descendants from getting focus, even * if they are focusable. */ public static final int FOCUS_BLOCK_DESCENDANTS = 0×60000;
/** * This view will get focus before any of its descendants. */
public static final int FOCUS_BEFORE_DESCENDANTS = 0×20000;
/** * This view will get focus only if none of its descendants want it. */
public static final int FOCUS_AFTER_DESCENDANTS = 0×40000;
/** * This view will block any of its descendants from getting focus, even * if they are focusable. */
public static final int FOCUS_BLOCK_DESCENDANTS = 0×60000;
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