Android文字图片写入CSV(Base64)并分享

首先，CSV逗号分隔值文件格式(Comma-Separated Values)，纯文本形式，逗号分隔，一行数据不跨行。

图片转换成Base64字符串

public String writeBase64(String path) {    //path图片路径    byte[] data = null;    try {      InputStream in = new FileInputStream(path);      data = new byte[in.available()];      in.read(data);      in.close();    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }    return Base64.encodeToString(data, Base64.NO_WRAP);  //注意这里是Base64.NO_WRAP    }

最后返回 Base64.encodeToString(data, Base64.NO_WRAP)， 注意 这里要使用Base64.NO_WRAP，而不是Base64.DEFAULT。default当字符串过长（RFC2045里规定了每行最多76个字符换行），自动会加入换行符，影响使用，用NO_WRAP解决。

生成和写入CSV

public File writeCsv() {    String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/csv/";   //CSV文件路径    File csv = new File(path + "KnowYourTeam.csv");    File pa = new File(path);    if (!pa.exists()) {      pa.mkdirs();    }    if (!csv.exists()) {      try {        csv.createNewFile();      } catch (IOException e) {        e.printStackTrace();      }    } else {      try {        csv.delete();      //这里写的如果文件存在会删除文件新建一个文件        csv.createNewFile();      } catch (IOException e) {        e.printStackTrace();      }    }    try {      BufferedWriter bw = new BufferedWriter(new FileWriter(csv, true));      ArrayList<Person> list = new PersonDao(this).queryAll();    //数据库取Person List      for (Person person : list) {         //循环写入person数据(name,title,image)        String img = writeBase64(person.getPicPath());     //getPicPath()路径        bw.write(person.getName() + "," + person.getTitle() + "," + img);        bw.newLine();            //换行，一行一组数据      }      bw.close();    } catch (IOException e) {      e.printStackTrace();    }    return csv;  }

File csv = writeCsv();    Intent sendIntent = new Intent();    sendIntent.setAction(Intent.ACTION_SEND);    sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(csv));    sendIntent.putExtra(Intent.EXTRA_SUBJECT, "KnowYourTeam shared data");    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式    sendIntent.putExtra(Intent.EXTRA_TEXT, "There is CSV. " + df.format(new Date()));    sendIntent.setType("text/comma-separated-values");    startActivity(Intent.createChooser(sendIntent, "share"));

Intent.ACTION_SEND 带附件发送

Intent.createChooser(sentIntent, "share") 可以选择支持这种格式的应用打开分享