Android 如何在对话框中设置相等的按钮高度？

我有一个进度对话框：

mProgressDialog = new ProgressDialog(WebViewActivity.this);

使用以下按钮：

mProgressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
            @Override
             public void onClick(DialogInterface dialog, int which) {
                //some code
            }
         });

我试图通过（并获取NullPointerException）设置它们的参数：

那么，如何在这里设置按钮的布局参数（不使用自定义进度对话框）？ 有些事情告诉我，我根本无法设置它们，而不是使用自定义进度对话框。。。

---

注意：如果我在这里遗漏了一些非常简单的内容，请原谅

按钮安装在dialog.onCreate（）之后的对话框中。因此，您可以重写此方法并在此处添加代码，或者必须在调用Dialog.show（）后获取该按钮

这是我的样品，我改变了第一个按钮的重量

    ProgressDialog dialog = new ProgressDialog(this);
    dialog.setButton(AlertDialog.BUTTON_POSITIVE, "confirm",
            (DialogInterface.OnClickListener) null);
    dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "cancel",
            (DialogInterface.OnClickListener) null);
    dialog.show();
    Button btConfirm = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) btConfirm
            .getLayoutParams();
    params.weight = 3;

---

下面是AlertDialog与生成器的代码

            AlertDialog.Builder builder = new AlertDialog.Builder(Setup.this);
            builder.setMessage("Message", 1))
            .setPositiveButton(getString(R.string.browseonlinesupport), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialogInterface, int i) {
            })
            .setNeutralButton(getString(R.string.submit_help_request), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialogInterface, int i) {
                }
            })
            .setNegativeButton(getString(R.string.cancel), null) // to make the button even widths
            //.show()
            ;
            //                }
            AlertDialog helpDialog = builder.create();
            helpDialog.show();  // call show() must from dialog not builder, otherwise button not created and getButton is null
            LinearLayout.LayoutParams btParams;
            Button btPositive = helpDialog.getButton(AlertDialog.BUTTON_POSITIVE);
            btParams = (LinearLayout.LayoutParams) btPositive.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;

            Button btNegative = helpDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
            btParams = (LinearLayout.LayoutParams) btNegative.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;

            Button btNeutral = helpDialog.getButton(AlertDialog.BUTTON_NEUTRAL);
            btParams = (LinearLayout.LayoutParams) btNeutral.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;

---

*，必须从dialog not builder调用show（），否则按钮未创建且getButton为空

您没有将

按钮设置为负

到

mProgressDialog

，这就是为什么您会得到

nullPointerException

您确实缺少一些简单的东西。您将按钮设置为中性，并尝试将按钮设置为负数。对不起，这是一个输入错误，因为我没有粘贴所有代码。我已经修复了它，当然我的源代码中没有它。也许你能看到这里有什么不对劲？@Houcine也许你注意到这里有什么不对劲？@Aswin Kumar也许你注意到这里有什么不对劲？谢谢！这是我的错误：“您必须在调用Dialog.show（）后获取按钮”。

            AlertDialog.Builder builder = new AlertDialog.Builder(Setup.this);
            builder.setMessage("Message", 1))
            .setPositiveButton(getString(R.string.browseonlinesupport), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialogInterface, int i) {
            })
            .setNeutralButton(getString(R.string.submit_help_request), new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialogInterface, int i) {
                }
            })
            .setNegativeButton(getString(R.string.cancel), null) // to make the button even widths
            //.show()
            ;
            //                }
            AlertDialog helpDialog = builder.create();
            helpDialog.show();  // call show() must from dialog not builder, otherwise button not created and getButton is null
            LinearLayout.LayoutParams btParams;
            Button btPositive = helpDialog.getButton(AlertDialog.BUTTON_POSITIVE);
            btParams = (LinearLayout.LayoutParams) btPositive.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;

            Button btNegative = helpDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
            btParams = (LinearLayout.LayoutParams) btNegative.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;

            Button btNeutral = helpDialog.getButton(AlertDialog.BUTTON_NEUTRAL);
            btParams = (LinearLayout.LayoutParams) btNeutral.getLayoutParams();
            btParams.weight = 1;
            btParams.width = btParams.MATCH_PARENT;