自定义一个View作为弹出对话框

public void dialog(){
//获得布局对象
        View view = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_loading, null);
        //设置参数等
        view.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT));
        iv = ((ImageView) view.findViewById(R.id.iv_loading));
        //开启动画
        AnimationDrawable drawable = (AnimationDrawable) iv.getBackground();
        drawable.start();
        //创建对话框和主题
        Dialog loading = new Dialog(getActivity(),R.style.NobackDialog);
        //设置是否能点击取消
        loading.setCancelable(false);
        //把视图加载如对话框
        loading.setContentView(view);
        loading.show();
    }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:orientation="vertical"
    android:layout_height="wrap_content">

    <ImageView
        android:background="@drawable/load_animation"
        android:id="@+id/iv_loading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

样式 可让带对话框透明

  <color name="no_back">#0fff</color>
    <style name="NobackDialog" parent="@android:style/Theme.Dialog">

        <item name="android:windowBackground">@color/no_back</item>

    </style>