Android如何读写CSV文件方法示例

前言

本文主要给大家介绍的是关于android读写csv文件的相关内容，csv也就是comma-separated values逗号分隔的文本文件，

读写csv文件和读写普通文件类似；写的时候给数据之间添加上逗号。

设定存储路径和文件名：

private static final string file_folder =
  environment.getexternalstoragedirectory().getabsolutepath()
  + file.separator + "aboutview" + file.separator + "data";
private static final string file_csv = "about_data.csv";

写csv文件

使用fileoutputstream来向文件尾部添加数据

fileoutputstream.write(byte[] data)向文件流写入字节数据。

class writedata2csvthread extends thread {
  short[] data;
  string filename;
  string folder;
  stringbuilder sb;
  public writedata2csvthread(short[] data, string folder, string filename) {
   this.data = data;
   this.folder = folder;
   this.filename = filename;
  }
  private void createfolder() {
   file filedir = new file(folder);
   boolean hasdir = filedir.exists();
   if (!hasdir) {
    filedir.mkdirs();// 这里创建的是目录
   }
  }
  @override
  public void run() {
   super.run();
   createfolder();
   file efile = new file(folder + file.separator + filename);
   if (!efile.exists()) {
    try {
     boolean newfile = efile.createnewfile();
    } catch (ioexception e) {
     e.printstacktrace();
    }
   }
   try {
    fileoutputstream os = new fileoutputstream(efile, true);
    sb = new stringbuilder();
    for (int i = 0; i < data.length; i++) {
     sb.append(data[i]).append(",");
    }
    sb.append("\n");
    os.write(sb.tostring().getbytes());
    os.flush();
    os.close();
   } catch (exception e) {
    e.printstacktrace();
   }
  }
 }

读csv文件

使用bufferedreader读取每一行内容；读出来的数据带有逗号分隔符

class readcsvthread extends thread {
  string filename;
  string folder;
  public readcsvthread(string folder, string filename) {
   this.folder = folder;
   this.filename = filename;
  }
  @override
  public void run() {
   super.run();
   file infile = new file(folder + file.separator + filename);
   final stringbuilder csb = new stringbuilder();
   string instring;
   try {
    bufferedreader reader =
     new bufferedreader(new filereader(infile));
    while ((instring = reader.readline()) != null) {
     csb.append(instring).append("\n");
    }
    reader.close();
   } catch (exception e) {
    e.printstacktrace();
   }
   runonuithread(new runnable() {
    @override
    public void run() {
     mcsvtv.settext(csb.tostring());// 显示
    }
   });
  }
 }

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。