Android 在默认警报对话框中居中显示消息

我已经创建了一个警报对话框，我想知道如何将消息的重心设置为中心：

Dialog dialog;
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(completedMessage());
dialog = builder.create();

下面是completedMessage（）方法：

}

以下是阵列。成功：

<string-array name="success">
    <item>You got it!</item>
    <item>Success!</item>
    <item>Done!</item>
    <item>Great job, young Padawan.</item>
</string-array>

但这并没有改变什么

顺便说一句，消息在框中显示为顶部和左侧有一个填充，但底部和右侧没有填充。

试试这个

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("My Title");
builder.setMessage("your message");
builder.setPositiveButton("OK", null);
AlertDialog dialog = builder.show();
TextView messageText = (TextView)dialog.findViewById(android.R.id.message);
messageText.setGravity(Gravity.CENTER);
dialog.show();

Dialog dialog;
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(completedMessage());
dialog = builder.show();
TextView messageView = (TextView)dialog.findViewById(android.R.id.message);
messageView.setGravity(Gravity.CENTER_VERTICAL);

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("My Title");
builder.setMessage("your message");
builder.setPositiveButton("OK", null);
AlertDialog dialog = builder.show();
TextView messageText = (TextView)dialog.findViewById(android.R.id.message);
messageText.setGravity(Gravity.CENTER);
dialog.show();