java - Android AlertDialog 将按钮对齐到底部不起作用

Question

我有一个AlertDialog带有一些信息和 Neutral 和 Positive 按钮的 Android。

我AlertDialog用下面的行设置了它的大小，这给了它我想要的正确高度：

MaterialAlertDialogBuilder alert = new MaterialAlertDialogBuilder(context);
alert.setView(wifiResultView);
// stuff
alertDialog = alert.show();
alertDialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

但是，这些按钮与对话框中数据的末尾对齐，我一生都无法弄清楚如何让它们粘在底部。有人知道吗？我将不胜感激。

我希望按钮粘在窗口的底部，在数据和按钮之间留有空间（而不是像图片中那样在按钮下方留有空间）。

我正在使用 Android 11（三星 Galaxy S10e）

非常感谢！

标签： javaandroidandroid-alertdialog

Answer 1

这是 的默认行为AlertDialog。AlertDialogLayout要将按钮与底部对齐，您还必须将警报容器的高度更改为MATCH_PARENT. 不幸的是，目前没有公共 API 来检索 AlertDialogLayoutfrom AlertDialog，所以下面我将描述两种可能的解决方案来检索它AlertDialog并改变它的高度。

1.直接从PositiveButton中找到AlertDialogLayout：

Button btn = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
AlertDialogLayout alertDialogLayout = (AlertDialogLayout) btn.getParent().getParent().getParent();
alertDialogLayout.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));

2.从 PositiveButton 根视图开始以循环方式查找 AlertDialogLayout：

Button btn = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
View rootView = btn.getRootView();
findAlertDialogLayoutAndSetParams(rootView);

辅助函数在哪里findAlertDialogLayoutAndSetParams(View view)，它会重复出现，直到找到 AlertDialogLayout：

private void findAlertDialogLayoutAndSetParams(View view){

    if(view instanceof ViewGroup) {
        ViewGroup viewGroup = (ViewGroup)view;
        for(int i = 0; i < viewGroup.getChildCount(); i++) {
            View childView = viewGroup.getChildAt(i);
            if(childView instanceof ViewGroup) {
                if(childView instanceof AlertDialogLayout){
                    AlertDialogLayout alertDialogLayout = (AlertDialogLayout)childView;
                    alertDialogLayout.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
                }
                else {
                    findAlertDialogLayoutAndSetParams(childView);
                }
            }
        }
    }
}

完整示例：

//get your custom view
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View wifiResultView = mInflater.inflate(R.layout.alert_view_layout, null, false);

//create the MaterialAlertDialogBuilder
MaterialAlertDialogBuilder alert = new MaterialAlertDialogBuilder(context);
alert.setPositiveButton("Ok", null);
alert.setNeutralButton("Cancel", null);
alert.setView(wifiResultView);
AlertDialog alertDialog = alert.show();
alertDialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

//stick the buttons to the bottom by setting the height of AlertDialogLayout to MATCH_PARENT
//1st option - get the AlertDialogLayout directly from the positive button
Button btn = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
AlertDialogLayout alertDialogLayout = (AlertDialogLayout) btn.getParent().getParent().getParent();
alertDialogLayout.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));

//2nd option - find AlertDialogLayout in a recurring way starting from the positive button root view
//Button btn = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
//View rootView = btn.getRootView();
//findAlertDialogLayoutAndSetParams(rootView);

之前/之后的结果：