Android 下载并打开PDF,Doc,Dwg文档实例

今天项目中遇到这样一个需求 ,根据后台接口里pdf,doc,dwg文档的地址 是一个url ,需要根据文档的url 下载到本地(内部存储或内存卡)并用手机中能打开该文档的软件弹出来并打开,(这里需要做一个缓存,第一次查看这个文档是在服务器上下载并打开,以后打开不需要下载直接打开本地的文档)在网上找了些资料 写了以下代码,下面分享给大家;

效果图:

代码:

这是一个单独的类 首先接收intent传过来的url我是用url的后14位作为存储本地的文件名(这里根据自己服务器的文件命名规则而定) 拿到文件路径之后 判断本地是否有此文件 有则打开没有则从服务器上下载并打开 ;

  intent intent = act.getintent();
  final string strname = intent.getstringextra("docurl");
  //截取最后14位 作为文件名
  string s = strname.substring(strname.length()-14);
  //文件存储
  file1 = new file(environment.getexternalstoragedirectory(), getfilename(s));
  new thread() {
   public void run() {
    file file = new file( file1.getabsolutepath());
    //判断是否有此文件
    if (file.exists()) {
     //有缓存文件,拿到路径 直接打开
     message msg = message.obtain();
     msg.obj = haha;
     msg.what = download_success;
     handler.sendmessage(msg);
     mprogressdialog.dismiss();
     return;
    }
//    本地没有此文件 则从网上下载打开
    file downloadfile = download(strname, file1.getabsolutepath(), mprogressdialog);
//    log.i("log",file1.getabsolutepath());
    message msg = message.obtain();
    if (downloadfile != null) {
     // 下载成功,安装....
     msg.obj = downloadfile;
     msg.what = download_success;
    } else {
     // 提示用户下载失败.
     msg.what = download_error;
    }
    handler.sendmessage(msg);
    mprogressdialog.dismiss();
   };
  }.start();

下载文档代码;

传入需要下载的文档的url 和存入内存的路径和dialog

 public static file download(string serverpath, string savedfilepath, progressdialog pd) {
  try {
   url url = new url(serverpath);
   httpurlconnection conn = (httpurlconnection) url.openconnection();
   conn.setconnecttimeout(5000);
   if (conn.getresponsecode() == 200) {
    int max = conn.getcontentlength();
    pd.setmax(max);
    inputstream is = conn.getinputstream();
    file file = new file(savedfilepath);
    fileoutputstream fos = new fileoutputstream(file);
    int len = 0;
    byte[] buffer = new byte[1024];
    int total = 0;
    while ((len = is.read(buffer)) != -1) {
     fos.write(buffer, 0, len);
     total += len;
     pd.setprogress(total);
    }
    fos.flush();
    fos.close();
    is.close();
    return file;
   } else {
    return null;
   }
  } catch (exception e) {
   e.printstacktrace();

  }

 }

打开文件选择器

handler handler = new handler() {
  public void handlemessage(android.os.message msg) {
   switch (msg.what) {
   case download_success:
    file file = (file) msg.obj;
    intent intent = new intent("android.intent.action.view");
    intent.addcategory("android.intent.category.default");
    intent.addflags (intent.flag_activity_new_task);
    intent.setdataandtype (uri.fromfile(file), "application/pdf");
//    startactivity(intent);
    startactivity(intent.createchooser(intent, "标题"));
    /**
     * 弹出选择框之后 把本activity销毁
     */
    finish();
    break;
   case download_error:
    util.showtoast(act,"文件加载失败");
    break;
   }
  }
 };

整体代码

public class list_item_doc extends baseactivity {

 private progressdialog mprogressdialog;

 // 下载失败
 public static final int download_error = 2;
 // 下载成功
 public static final int download_success = 1;
 private file file1;
 @override
 protected void oncreate(bundle arg0) {
  // todo auto-generated method stub
  super.oncreate(arg0);

  initview();
 }

 private void initview() {
  // todo auto-generated method stub
  intent intent = act.getintent();
  final string strname = intent.getstringextra("url");
  mprogressdialog = new progressdialog(act);
  mprogressdialog.setprogressstyle(progressdialog.style_horizontal);
  mprogressdialog.setcancelable(false);
  mprogressdialog.show();
  //截取最后14位 作为文件名
  string s = strname.substring(strname.length()-14);
  //文件存储
  file1 = new file(environment.getexternalstoragedirectory(), getfilename(s));
  new thread() {
   public void run() {

    file haha = new file( file1.getabsolutepath());
    //判断是否有此文件
    if (haha.exists()) {
     //有缓存文件,拿到路径 直接打开
     message msg = message.obtain();
     msg.obj = haha;
     msg.what = download_success;
     handler.sendmessage(msg);
     mprogressdialog.dismiss();
     return;
    }
//    本地没有此文件 则从网上下载打开
    file downloadfile = download(strname, file1.getabsolutepath(), mprogressdialog);
//    log.i("log",file1.getabsolutepath());
    message msg = message.obtain();
    if (downloadfile != null) {
     // 下载成功,安装....
     msg.obj = downloadfile;
     msg.what = download_success;
    } else {
     // 提示用户下载失败.
     msg.what = download_error;
    }
    handler.sendmessage(msg);
    mprogressdialog.dismiss();
   };
  }.start();
 }

 /**
  * 下载完成后 直接打开文件
  */
 handler handler = new handler() {
  public void handlemessage(android.os.message msg) {
   switch (msg.what) {
   case download_success:
    file file = (file) msg.obj;
    intent intent = new intent("android.intent.action.view");
    intent.addcategory("android.intent.category.default");
    intent.addflags (intent.flag_activity_new_task);
    intent.setdataandtype (uri.fromfile(file), "application/pdf");
//    startactivity(intent);
    startactivity(intent.createchooser(intent, "标题"));
    /**
     * 弹出选择框 把本activity销毁
     */
    finish();
    break;
   case download_error:
    util.showtoast(act,"文件加载失败");
    break;
   }
  }
 };
/**
 *
 */


 /**
  * 传入文件 url 文件路径 和 弹出的dialog 进行 下载文档
  */
 public static file download(string serverpath, string savedfilepath, progressdialog pd) {
  try {
   url url = new url(serverpath);
   httpurlconnection conn = (httpurlconnection) url.openconnection();
   conn.setconnecttimeout(5000);
   if (conn.getresponsecode() == 200) {
    int max = conn.getcontentlength();
    pd.setmax(max);
    inputstream is = conn.getinputstream();
    file file = new file(savedfilepath);  
    fileoutputstream fos = new fileoutputstream(file);
    int len = 0;
    byte[] buffer = new byte[1024];
    int total = 0;
    while ((len = is.read(buffer)) != -1) {
     fos.write(buffer, 0, len);
     total += len;
     pd.setprogress(total);
    }
    fos.flush();
    fos.close();
    is.close();
    return file;
   } else {
    return null;
   }
  } catch (exception e) {
   e.printstacktrace();
   return null;
  }

 }

 public static string getfilename(string serverurl) {
  return serverurl.substring(serverurl.lastindexof("/") + 1);
 }

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。