Android AlertDialog 将按钮底部对齐不起作用

Question

我有一个 Android AlertDialog，其中包含一些信息以及中立和肯定按钮。

我用下面一行设置了 AlertDialog 的大小，它给出了我想要的正确高度：

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，按钮与对话框中数据的末尾对齐，我一辈子都想不出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 window 的底部，数据和按钮之间有 space（而不是像图片中那样在按钮下方有 space） .

我正在使用 Android 11（三星 Galaxy S10e）

非常感谢！

Answer 1

我正在使用这段代码，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();

能否请您分享更多有关 AlertDialog 代码和设备 Android 版本的详细信息，同时尝试在花药 phone.

中进行测试

编辑

你可以把Space放在wifiResultView的末尾:

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

而不是将 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);

Answer 2

这是 AlertDialog 的默认行为。要将按钮对齐到底部，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 public API 从 AlertDialog 检索 AlertDialogLayout，所以下面我将描述两种可能的解决方案，从 AlertDialog 检索它并更改它的高度。

1.Find 直接来自 PositiveButton 的 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.Find AlertDialogLayout 从 PositiveButton 根视图开始以循环方式出现：

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

其中 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);

结果before/after:

Android AlertDialog 将按钮底部对齐不起作用

Android AlertDialog align buttons to bottom not working

java

android

android-alertdialog