Android 如何本地加载pdf文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <include layout="@layout/common_title" /> <com.github.barteksc.pdfviewer.PDFView  android:id="@+id/pdf_view"  android:layout_width="match_parent"  android:layout_height="match_parent" /></LinearLayout>

if (CheckFileExist(title)){   builderShow = new CustomDialog(ShowPDFActivity.this);   LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);   View view = inflater.inflate(R.layout.dialog_pdf_progress_new, null);   builderShow.setContentView(view);   builderShow.show();   isDownload=false;   refushUI();  }else {   isDownload=true;   DownLoadPDF.getInstance().downLoadPDF(ShowPDFActivity.this, //下载路径);  }

public void refushUI(){  try {   pdfView.fromFile(new File(//pdf文件的绝对路径,//标题))     .defaultPage(1)     .enableAnnotationRendering(false)     .onLoad(new OnLoadCompleteListener() {      @Override      public void loadComplete(int nbPages) {       if (isDownload){        DownLoadPDF.getInstance().closeDilaoig();       }       if (builderShow != null&&builderShow.isShowing()) {        builderShow.dismiss();       }      }     })     .scrollHandle(null)     .load();  }catch (Exception e){   e.printStackTrace();  } }

private void displayFromAssets(String assetFileName ) {  pdfView.fromAsset(assetFileName) //设置pdf文件地址    .defaultPage(6)   //设置默认显示第1页    .onPageChange(this)  //设置翻页监听    .onLoad(this)   //设置加载监听    .onDraw(this)   //绘图监听    .showMinimap(false)  //pdf放大的时候，是否在屏幕的右上角生成小地图    .swipeVertical( false ) //pdf文档翻页是否是垂直翻页，默认是左右滑动翻页    .enableSwipe(true) //是否允许翻页，默认是允许翻页    // .pages( 2 , 3 , 4 , 5 ) //把2 , 3 , 4 , 5 过滤掉    .load(); } private void displayFromFile( File file ) {  pdfView.fromFile(file) //设置pdf文件地址    .defaultPage(6)   //设置默认显示第1页    .onPageChange(this)  //设置翻页监听    .onLoad(this)   //设置加载监听    .onDraw(this)   //绘图监听    .showMinimap(false)  //pdf放大的时候，是否在屏幕的右上角生成小地图    .swipeVertical( false ) //pdf文档翻页是否是垂直翻页，默认是左右滑动翻页    .enableSwipe(true) //是否允许翻页，默认是允许翻    // .pages( 2 , 3 , 4 , 5 ) //把2 , 3 , 4 , 5 过滤掉    .load(); }

public class DownLoadPDF { private static Context context; private static File file ; private static CustomDialog builder = null ; private static Handler ddhandle; private static DownLoadPDF instance = null; public static DownLoadPDF getInstance(){  if(instance==null){   synchronized (DownLoadPDF.class){    if(instance==null){     instance = new DownLoadPDF();    }   }  }  return instance; } public void downLoadPDF(final Context con, final String url, final String title, final Handler ddhandler) {  ddhandle = ddhandler;  context = con;  builder = new CustomDialog(con);  LayoutInflater inflater = (LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  View view = inflater.inflate(R.layout.dialog_pdf_progress_new, null);  builder.setContentView(view);  builder.show();  new Thread() {   @Override   public void run() {    try {     file = getFileFromServer(url,title);     sleep(200);     if (file != null) {      handler.sendEmptyMessage(2);     }    } catch (Exception e) {     e.printStackTrace();     builder.dismiss();     handler.sendEmptyMessage(-1);    }   }  }.start(); } public void closeDilaoig(){  if (builder != null&&builder.isShowing()) {   builder.dismiss();  } }public static int length ; public static File getFileFromServer(String path,String title)   throws Exception {  // 如果相等的话表示当前的sdcard挂载在手机上并且是可用的  if (Environment.getExternalStorageState().equals(    Environment.MEDIA_MOUNTED)) {   URL url = new URL(path);   HttpURLConnection conn = (HttpURLConnection) url.openConnection();   conn.setConnectTimeout(5000);   conn.setDoInput(true);   conn.connect();   length = conn.getContentLength();   InputStream is = conn.getInputStream();   //将pdf文件存储在指定文件夹下   File filePath = new File(//指定文件夹路径);   if (!filePath.exists()){    filePath.mkdir();   }   File file = new File(filePath , title+".pdf");   FileOutputStream fos = new FileOutputStream(file);   BufferedInputStream bis = new BufferedInputStream(is);   byte[] buffer = new byte[1024];   int len;   while ((len = bis.read(buffer)) != -1) {    fos.write(buffer, 0, len);    handler.sendEmptyMessage(0);   }   fos.close();   bis.close();   is.close();   return file;  } else {   handler.sendEmptyMessage(-1);   return null;  } } private static Handler handler = new Handler(){  @Override  public void handleMessage(Message msg) {   super.handleMessage(msg);   switch (msg.what) {   case 0:    break;   case -1:    //下载失败    Toast.makeText(context, "下载失败，请稍后再试！", Toast.LENGTH_SHORT).show();    break;   case 2:    ddhandle.sendEmptyMessage(100);    break;   default:    break;   }  } };}