android - 将 AlertDialog 按钮对齐到中心

Question

我将此代码用于 Android (Java) 编程:

public static MessageBoxResult showOk(
        Context context, String title, String message, String okMessage)
{
    okDialogResult = MessageBoxResult.Closed;

    // make a handler that throws a runtime exception when a message is received
    final Handler handler = new Handler()
    {
        @Override
        public void handleMessage(Message mesg)
        {
            throw new RuntimeException();
        }
    };

    AlertDialog.Builder alert = new AlertDialog.Builder(context);
    alert.setTitle(title);
    alert.setMessage(message);

    alert.setPositiveButton(okMessage, new DialogInterface.OnClickListener() {

        public void onClick(DialogInterface dialog, int whichButton) {
            okDialogResult = MessageBoxResult.Positive;
            handler.sendMessage(handler.obtainMessage());
        }
    });

    AlertDialog dialog = alert.show();


    // align button to center
    Button b = (Button) dialog.findViewById(android.R.id.button1);
    b.setGravity(Gravity.CENTER_HORIZONTAL);

    // loop till a runtime exception is triggered.
    try { Looper.loop(); }
    catch(RuntimeException e2) {}

    return okDialogResult;
}

我的问题是如何使按钮居中？如您所见，我尝试使用 Gravity.CENTER_HORIZONTAL (也是 .CENTER)将按钮与中心对齐，但没有任何变化。按钮几乎处于正确位置。

Answer 1

使用crtn的方法，但是不是改变LayoutParam的重力，而是改变它的宽度为ViewGroup.LayoutParams.MATCH_PARENT;