android 打开文件

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    private void openFile(File f)
    {
      Intent intent = new Intent();
      intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      intent.setAction(android.content.Intent.ACTION_VIEW);

      /* 调用getMIMEType()来取得MimeType */
      String type = getMIMEType(f);
      /* 设置intent的file与MimeType */
      intent.setDataAndType(Uri.fromFile(f),type);
      startActivity(intent);
    }

    /* 判断文件MimeType的method */
    private String getMIMEType(File f)
    {
      String type="";
      String fName=f.getName();
      /* 取得扩展名 */
      String end=fName.substring(fName.lastIndexOf(".")
      +1,fName.length()).toLowerCase();

      /* 依扩展名的类型决定MimeType */
      if(end.equals("m4a")||end.equals("mp3")||end.equals("mid")||
      end.equals("xmf")||end.equals("ogg")||end.equals("wav"))
      {
        type = "audio";
      }
      else if(end.equals("3gp")||end.equals("mp4"))
      {
        type = "video";
      }
      else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||
      end.equals("jpeg")||end.equals("bmp"))
      {
        type = "image";
      }
      else if(end.equals("apk"))
      {
        /* android.permission.INSTALL_PACKAGES */
        type = "application/vnd.android.package-archive";
      }
      else
      {
        type="*";
      }
      /*如果无法直接打开，就跳出软件列表给用户选择 */
      if(end.equals("apk"))
      {
      }
      else
      {
        type += "/*";
      }
      return type;
    }

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