Android SD卡上文件操作及记录日志操作实例分析

本文实例讲述了android sd卡上文件操作及记录日志操作的方法。分享给大家供大家参考，具体如下：

// sd卡是否存在
private boolean checksdcardstatus() {
 boolean sdcardstatus = false;
 string sdstatestring = android.os.environment.getexternalstoragestate();
 if (sdstatestring.equals(android.os.environment.media_mounted)) {
  sdcardstatus = true;
 } else {
  // sd卡不可用
 }
 return sdcardstatus;
}
// sd卡上是否有apk文件
private boolean checkfileexist(string ifilepath) {
 boolean fileexist = false;
 if (checksdcardstatus()) {
  file myfile = new file(ifilepath);
  if (myfile.exists()) {
  fileexist = true;
  }
 }
 return fileexist;
}
//删除文件
private void deleteapk(string ifilepath) {
 if (checksdcardstatus()) {
  file myfile = new file(ifilepath);
  if (myfile.exists()) {
  myfile.delete();
  }
 }
}
//在sd卡上用txt记录
public static void logonfile(string format, object... args){
 string logstr = string.format(format, args);
 simpledateformat sdateformat = new simpledateformat("yyyy-mm-dd  hh:mm:ss");
 string date  =  sdateformat.format(new java.util.date());
 logstr = "/r/n-------------------------/r/n" + date + "/r/n" + logstr;
 fileoutputstream fout;
 dataoutputstream dataout;
 try {
  fout = new fileoutputstream("//sdcard//log.txt",true);
  dataout = new dataoutputstream(fout);
  dataout.writeutf(logstr);
  dataout.flush();
  dataout.close();
  fout.flush();
  fout.close();
 } catch (filenotfoundexception e) {
  e.printstacktrace();
 } catch (ioexception e) {
  e.printstacktrace();
 }
}

希望本文所述对大家android程序设计有所帮助。