将SQlite中的数据以txt文件导出

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;

}

（编辑：李大同）

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