网络请求时显示正在请求转圈

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Dialog dialog=new Dialog(this,R.style.dialog);
dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.loading_dialog);
dialog.setCanceledOnTouchOutside(false);
dialog.show();

styles.xml
<style name="dialog" parent="@android:style/Theme.Dialog">
        <item name="android:windowBackground">@android:color/transparent</item>
    </style>

布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="#90000000"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="220dp"
        android:padding="20dp"
        android:gravity="center"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <ProgressBar
            android:id="@+id/progressBar1"
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <TextView
            android:layout_marginTop="10dp"
            android:textSize="20dp"
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="正在查询..." />

    </LinearLayout>

</LinearLayout>