android - 如何居中进度条？

Question

它是水平居中而不是垂直居中。我在这里尝试了其他解决方案，但似乎没有用。谁能解释一下我该如何解决这个问题？

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"  >

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical|center_horizontal" />

</LinearLayout>

Answer 1

将 android:gravity="center" 添加到 LinearLayout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical|center_horizontal" />

</LinearLayout>

http://developer.android.com/reference/android/widget/LinearLayout.html#attr_android:gravity

Specifies how an object should position its content, on both the X and Y axes, within its own bounds.