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来源：互联网发布：argentum银霜知乎编辑：程序博客网时间：2024/06/18 15:43

android dialog 升起时，保持后台输入法仍然打开

这里有两个重要的参数，现拷贝如下：
WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM和WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
这两个参数相互作用能够应对dialog升起时，后台输入法的状态。

现有两个dialog，第一个dialog先弹出，上面有个EditText，第二个dialog后弹出，上面不可以输入内容，如何保持第二个dialog弹出时，第一个dialog上的输入法不消失呢？就是上面用到的两个参数。（如何判断一个dialog上有没有可编辑的输入框，AlertDialog会遍历View，并使用View的onCheckIsTextEditor()方法来检查有没有可编辑内容）

FLAG_ALT_FOCUSABLE_IM没有设置，FLAG_NOT_FOCUSABLE没有设置
不做讨论
FLAG_ALT_FOCUSABLE_IM设置，FLAG_NOT_FOCUSABLE没有设置
键盘会在底部，弹框能够覆盖在输入法上面，且能接受反馈键指令，按返回键第二个弹框消失。
FLAG_ALT_FOCUSABLE_IM没有设置，FLAG_NOT_FOCUSABLE设置
键盘会在底部，弹框能够覆盖在输入法上面，但是不能接受Button指令，按返回键，底部的键盘消失和第一个dialog消失，第二个dialog还在。
FLAG_ALT_FOCUSABLE_IM设置，FLAG_NOT_FOCUSABLE设置
键盘会在第二个dialog上面，弹框不能够覆盖在输入法上面，也不能接受Button指令，按返回键，底部的键盘消失，第一个dialog消失，第二个dialog还在。

   /** Window flag: invert the state of {@link #FLAG_NOT_FOCUSABLE} with         * respect to how this window interacts with the current method.  That         * is, if FLAG_NOT_FOCUSABLE is set and this flag is set, then the         * window will behave as if it needs to interact with the input method         * and thus be placed behind/away from it; if FLAG_NOT_FOCUSABLE is         * not set and this flag is set, then the window will behave as if it         * doesn't need to interact with the input method and can be placed         * to use more space and cover the input method.         */        public static final int FLAG_ALT_FOCUSABLE_IM = 0x00020000;

    /** Window flag: this window won't ever get key input focus, so the         * user can not send key or other button events to it.  Those will         * instead go to whatever focusable window is behind it.  This flag         * will also enable {@link #FLAG_NOT_TOUCH_MODAL} whether or not that         * is explicitly set.         *         * <p>Setting this flag also implies that the window will not need to         * interact with         * a soft input method, so it will be Z-ordered and positioned         * independently of any active input method (typically this means it         * gets Z-ordered on top of the input method, so it can use the full         * screen for its content and cover the input method if needed.  You         * can use {@link #FLAG_ALT_FOCUSABLE_IM} to modify this behavior. */        public static final int FLAG_NOT_FOCUSABLE      = 0x00000008;

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