Android 打开网络上pdf文件

/**

 * 加载pdf文件
 * @param onPageChangeListener
 * @param onLoadCompleteListener
 * @param onDrawListener
 * @param fileUrl
 * @param fileName
 */
 public void fileFromLocalStorage(
 final OnPageChangeListener onPageChangeListener,
     final OnLoadCompleteListener onLoadCompleteListener,
     final OnDrawListener onDrawListener,
     String fileUrl,
     final String fileName)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
tools:context="com.lidong.pdf.androidpdf.MainActivity">
 <com.lidong.pdf.PDFView
 android:id="@+id/pdfView"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 />
</RelativeLayout>

import android.graphics.Canvas;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import com.lidong.pdf.PDFView;
import com.lidong.pdf.api.ApiManager;
import com.lidong.pdf.listener.OnDrawListener;
import com.lidong.pdf.listener.OnLoadCompleteListener;
import com.lidong.pdf.listener.OnPageChangeListener;
import com.lidong.pdf.util.FileUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import okhttp3.ResponseBody;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.schedulers.Schedulers;

public class MainActivity extends AppCompatActivity implements OnPageChangeListener
 ,OnLoadCompleteListener, OnDrawListener {
 private PDFView pdfView ;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 pdfView = (PDFView) findViewById( R.id.pdfView );
 displayFromFile1("填写所要打开的pdf地址");
 }
 /**
 * 获取打开网络的pdf文件
 * @param fileUrl
 * @param fileName
 */
 private void displayFromFile1( String fileUrl ,String fileName) {
 showProgress(); pdfView.fileFromLocalStorage(this,this,this,fileUrl,fileName); //设置pdf文件地址

 }
 /**
 * 翻页回调
 * @param page
 * @param pageCount
 */
 @Override
 public void onPageChanged(int page, int pageCount) {
 Toast.makeText( MainActivity.this , "page= " + page +
 " pageCount= " + pageCount , Toast.LENGTH_SHORT).show();
 }
 /**
 * 加载完成回调
 * @param nbPages 总共的页数
 */
 @Override
 public void loadComplete(int nbPages) {
 Toast.makeText( MainActivity.this , "加载完成" + nbPages , Toast.LENGTH_SHORT).show();
 hideProgress();
 }
 @Override
 public void onLayerDrawn(Canvas canvas, float pageWidth, float pageHeight, int displayedPage) {
 // Toast.makeText( MainActivity.this , "pageWidth= " + pageWidth + "
 // pageHeight= " + pageHeight + " displayedPage=" + displayedPage , Toast.LENGTH_SHORT).show();
 }
 /**
 * 显示对话框
 */
 private void showProgress(){
 LoadingUIHelper.showDialogForLoading(this,"报告加载中,请等待。。。",false);
 }
 /**
 * 关闭等待框
 */
 private void hideProgress(){
 LoadingUIHelper.hideDialogForLoading();
 }