PoupWindow背景util

適合底部popupwindow彈出時背景設置半透明效果

常量

    public static final float POPUP_WINDOW_BG_ALPHA=0.5f;
    public static final float POPUP_WINDOW_BG_ALPHA_NOMAL=1f;

public class PopupWindowUtil {
    private static Activity act;

    public static void addbgAlpha(PopupWindow popupWindow, Activity activity) {

        act = activity;
        popupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
        popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        //設置
        WindowManager.LayoutParams lp = act.getWindow().getAttributes();
        lp.alpha = Constants.POPUP_WINDOW_BG_ALPHA;
        act.getWindow().setAttributes(lp);
        //恢復
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                WindowManager.LayoutParams lp = act.getWindow().getAttributes();
                lp.alpha = Constants.POPUP_WINDOW_BG_ALPHA_NOMAL;
                act.getWindow().setAttributes(lp);
            }
        });
        popupWindow.setOutsideTouchable(false);
        popupWindow.setFocusable(true);
    }
}