如何在屏幕中央显示进度条

Question

My code show space on top of listview (see left image). If I remove android:gravity="center" then it will show correctly (see right image)

But ProgressBar does not display on center of screen, it's displayed on the left of screen.

<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <ListView 
        android:id="@+id/listCategory2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:fadeScrollbars="true"
        android:fastScrollEnabled="true"
        android:divider="@color/background"
        android:dividerHeight="1dp"
        android:visibility="gone"
        android:background="@drawable/border9" 
        android:listSelector="@drawable/listview_selector" />

    <ProgressBar 
        android:id="@+id/prgLoading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="@android:style/Widget.ProgressBar.Inverse"
        android:layout_centerInParent="true" />

    <TextView 
        android:id="@+id/txtAlert"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/alert"
        android:textColor="@color/text"
        android:textSize="14sp"
        android:layout_centerInParent="true"
        android:visibility="gone" />

       </LinearLayout>

Answer 1

The parent layout which you have taken is LinearLayout and the method in your xml android:layout_centerInParent="true" works for RelativeLayout. You need to change it to android:layout_gravity="center". You can instead change the parent layout to RelativeLayout.

Answer 2

You can use <FrameLayout> , it really good for you.

And set progressbar (need match_parent for layout_width and layout_height ) as :

<ProgressBar 
    android:id="@+id/prgLoading"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    style="@android:style/Widget.ProgressBar.Inverse"
    android:layout_centerInParent="true"/>

Hope to help,

Answer 3

使其成为RelativeLayout而不是LinearLayout ，并为ListView添加android:layout_alignParentTop="true"并为进度条添加android:layout_centerInParent="true"

Answer 4

<ProgressBar
        android:id="@+id/loading_spinner"
        style="@style/Widget.AppCompat.ProgressBar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        />

For Linear layout

Answer 5

Simple way to center it inside a ConstraintLayout

<androidx.core.widget.ContentLoadingProgressBar
        android:id="@+id/myProgress"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"/>