android保存文件

public static boolean IsSdCard()
{
boolean nIsSaveSdCard=false;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
nIsSaveSdCard= true;
else
nIsSaveSdCard= false;
return nIsSaveSdCard;
}

public static boolean MakeDirs(String aPath)
{
boolean nIsExist=false;
if (IsSdCard()) {
File sdCardDir = Environment.getExternalStorageDirectory File nPath=new File(sdCardDir.getAbsolutePath()+"/"+aPath);
nIsExist=nPath.exists();
if(!nIsExist)
nIsExist=nPath.mkdirs();
}
else
{
File nPath=new File("./"+aPath);
nIsExist=nPath.exists();
if(!nIsExist)
nIsExist=nPath.mkdirs();
}
return nIsExist;
}


public static FileOutputStream GetFileOutStream(String aFileName,boolean aIsApp)
{
try {
if (IsSdCard()) {
File sdCardDir = Environment.getExternalStorageDirectory File saveFile = new File(sdCardDir, aFileName);
FileOutputStream outStream = new FileOutputStream(saveFile,aIsApp);
return outStream;
}
else
{
File saveFile = new File("./", aFileName);
FileOutputStream outStream = new FileOutputStream(saveFile,aIsApp);
return outStream;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}