android内存管理工具类，android工具类, public c

android内存管理工具类，android工具类, public c

    public class MemoryManager {          private static final String TAG = "MemoryManager";          private static final int MAXMEMORY=50*1024*1024;//程序运行的最大内存          /**          * 判断系统是否在低内存下运行          * @param context          * @return          */          public static boolean hasAcailMemory() {              // 获取手机内部空间大小              long memory = getAvailableInternalMemorySize();              Log.i(TAG, memory+"");              if (memory < MAXMEMORY) {                  //应用将处于低内存状态下运行                  return false;              } else {                  return true;              }          }          /**          * 获取手机内部可用空间大小          *           * @return          */          public static long getAvailableInternalMemorySize() {              File path = Environment.getDataDirectory();// 获取 Android 数据目录              StatFs stat = new StatFs(path.getPath());// 一个模拟linux的df命令的一个类,获得SD卡和手机内存的使用情况              long blockSize = stat.getBlockSize();// 返回 Int ，大小，以字节为单位，一个文件系统              long availableBlocks = stat.getAvailableBlocks();// 返回 Int ，获取当前可用的存储空间              return availableBlocks * blockSize;          }          /**          * 获取手机内部空间大小          *           * @return          */          public static long getTotalInternalMemorySize() {              File path = Environment.getDataDirectory();              StatFs stat = new StatFs(path.getPath());              long blockSize = stat.getBlockSize();              long totalBlocks = stat.getBlockCount();// 获取该区域可用的文件系统数              return totalBlocks * blockSize;          }          /**          * 获取手机外部可用空间大小          *           * @return          */          public static long getAvailableExternalMemorySize() {              if (externalMemoryAvailable()) {                  File path = Environment.getExternalStorageDirectory();                  StatFs stat = new StatFs(path.getPath());                  long blockSize = stat.getBlockSize();                  long availableBlocks = stat.getAvailableBlocks();                  return availableBlocks * blockSize;              } else {                  throw new RuntimeException("Don't have sdcard.");              }          }          /**          * 获取手机外部空间大小          *           * @return          */          public static long getTotalExternalMemorySize() {              if (externalMemoryAvailable()) {                  File path = Environment.getExternalStorageDirectory();// 获取外部存储目录即 SDCard                  StatFs stat = new StatFs(path.getPath());                  long blockSize = stat.getBlockSize();                  long totalBlocks = stat.getBlockCount();                  return totalBlocks * blockSize;              } else {                  throw new RuntimeException("Don't have sdcard.");              }          }          /**          * 外部存储是否可用          *           * @return          */          public static boolean externalMemoryAvailable() {              return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);          }      }