Android AlertDialog 将按钮对齐到底部不起作用

Question

我有一个 Android AlertDialog 有一些信息和中性和积极按钮。

我用下面这行设置了AlertDialog 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。

我希望按钮贴在窗口底部，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）。

我使用的是 Android 11（三星 Galaxy S10e）

非常感谢！

Answer 1

这是AlertDialog 的默认行为。要将按钮与底部对齐，您还必须将警报容器 AlertDialogLayout 的高度更改为 MATCH_PARENT。不幸的是，目前没有公共 API 可以从 AlertDialog 检索 AlertDialogLayout，所以下面我将描述两种可能的解决方案来从 AlertDialog 检索它并更改其高度。

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根视图开始循环查找AlertDialogLayout：

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

findAlertDialogLayoutAndSetParams(View view) 是一个辅助函数，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：

Answer 2

我正在使用此代码，它工作正常：

AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("test title");
    builder.setCancelable(false);
    builder.setPositiveButton("unfreeze", (dialog, which) -> {
        // do some things
    });
    builder.setNeutralButton("ok", (dialog, which) -> {
        // do some things
    });
    AlertDialog alertDialog = builder.create();
    alertDialog.getWindow()
            .setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.MATCH_PARENT);

    alertDialog.show();

能否请您分享您的AlertDialog代码和您的设备Android版本的更多详细信息，也尝试在其他手机中进行测试。

编辑

您可以将Space 放在wifiResultView 的末尾：

<Space
        android:layout_width="match_parent"
        android:layout_height="200dp" />

将LayoutParams.MATCH_PARENT 更改为LayoutParams.WRAP_CONTENT

您的代码将是这样的：

alertDialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT,
 ViewGroup.LayoutParams.WRAP_CONTENT);