String filename =fileName(); initData(filename);
@SuppressLint("SimpleDateFormat") public void initData(String f1) { File f = new File(f1); if (f.exists()) { f.delete(); } file = new File(getSdpath() + "/Scan"); makeDir(file); TxtUtils.writeTxt(f1,"条码"+" "+"数量"+"\n"); //将从数据库中读取的数据写入txt文件中 cursor = databaSEOperation.query_db(); if(cursor.movetoFirst()){ do{ String code=cursor.getString(cursor.getColumnIndex("code")); String num=cursor.getString(cursor.getColumnIndex("num")); TxtUtils.writeTxt(f1,code+","+" "+num+"\n"); }while (cursor.movetoNext()); } }
public static void makeDir(File dir) { if (!dir.getParentFile().exists()) { makeDir(dir.getParentFile()); } dir.mkdir(); }
public static void writeTxt(String fileName,String content) {
try
{ //要指定编码方式,否则会出现乱码 OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(fileName,true),"gbk");
osw.write(content);
osw.close();
} catch (IOException e) {
e.printstacktrace();
}
}
private String fileName(){
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd-hh-mm");
String date=sdf.format(new java.util.Date());
String filename="/mnt/sdcard/Scan/"+date+".txt";
return filename;
}
public String getSdpath() {
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
if (sdCardExist) {
sdDir = Environment.getExternalStorageDirectory();
}
String dir = sdDir.toString();
return dir;
}
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