主要代码

import android.app.Dialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import cn.com.kspay.R;

/**
 *  加载中dialog
 * @author zhongzhengming
 * @e-mail zhongzhengming@kspay.net
 * @time 2017/12/19
 */
public class LoadingDialog {
    private Dialog mLoadingDialog;

    /**
     * @param context
     * @param message dialog中文字
     */
    public LoadingDialog(Context context, String message) {
        // 首先得到整个View
        View view = LayoutInflater.from(context).inflate(
            R.layout.dialog_loading, null);
        // 获取整个布局
        LinearLayout layout = (LinearLayout) view.findViewById(R.id.dialog_loading_view);
        // 页面中显示文本
        TextView loadingText = (TextView) view.findViewById(R.id.tipTextView);
        // 显示文本
        loadingText.setText(message);
        // 创建自定义样式的Dialog
        mLoadingDialog = new Dialog(context, R.style.loading_dialog);
        // 设置返回键无效
        mLoadingDialog.setCancelable(false);
        mLoadingDialog.setContentView(layout, new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.MATCH_PARENT));
    }


    public void showDialog() {
        if (mLoadingDialog != null && !mLoadingDialog.isShowing()) {
            mLoadingDialog.show();
        }
    }

    public void cancelDialog() {
        if (mLoadingDialog != null && mLoadingDialog.isShowing()) {
            mLoadingDialog.dismiss();
        }
    }
}

布局文件

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

    <LinearLayout
        android:layout_width="150dp"
        android:layout_height="110dp"
        android:background="@drawable/loading_bg"
        android:gravity="center"
        android:orientation="vertical"
        android:paddingBottom="10dp"
        android:paddingLeft="21dp"
        android:paddingRight="21dp"
        android:paddingTop="10dp">

        <ProgressBar
            android:id="@+id/progressBar1"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_gravity="center_horizontal"
            android:indeterminateBehavior="repeat"
            android:indeterminateDrawable="@drawable/dialog_loading"
            android:indeterminateOnly="true" />

        <TextView
            android:id="@+id/tipTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dp"
            android:text="加载中..."
            android:textColor="#f0f0f0"
            android:textSize="15sp" />
    </LinearLayout>

</LinearLayout>```