android取得sd卡路径

android获得sd卡路径
import java.io.File;

import android.os.Environment;

class SDUtil{
  public static String getSdcardPath() {
    File sdDir = null;
    boolean sdCardExist = Environment.getExternalStorageState().equals(
        android.os.Environment.MEDIA_MOUNTED); //判断系统环境是否就绪
    if (sdCardExist) {
      sdDir = Environment.getExternalStorageDirectory();
    }

    return sdDir.toString() + "/";
  }
}