android内存管理工具类

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 SDCardStatFs 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);}}
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