android - 在自定义对话框中居中 ProgressBar

Question

我有一个android.app.Dialog没有标题或边框的自定义对话框（继承自 ）。在此对话框中，我添加了一个 normal ProgressBar，并希望将其置于对话框的中心。对话框本身有一个全屏背景图像。除了进度条没有在对话框中居中之外，一切似乎都正常。它看起来像这样：

这是我在 customDialog 类中使用的代码，用于将进度条添加到对话框中：

ProgressBar progBar = new ProgressBar(context);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
addContentView(progBar, layoutParams);

getWindow().setGravity(Gravity.CENTER);

有什么我遗漏或出错的吗？

Answer 1

尝试这个，

      LinearLayout.LayoutParams ll = (LinearLayout.LayoutParams)b.getLayoutParams();    
ll.gravity = Gravity.CENTER;
progBar.setLayoutParams(ll);

Answer 2

尝试这个..

    ProgressBar progBar = new ProgressBar(context);

    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    lp.addRule(RelativeLayout.CENTER_HORIZONTAL, progBar.getId());
    lp.addRule(RelativeLayout.CENTER_VERTICAL, progBar.getId());

    parentLayout.addView(progBar, lp);

Answer 3

试试这个，设置布局高度和宽度FILL_PARENT

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
params.gravity = Gravity.CENTER;
progBar.setLayoutParams(params);