Android 内存管理工具

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/*********************************************** * 内存管理工具 *  * @author chen.lin * @version 1.0 ************************************************/public class MemoryManager {    private static final String TAG = "MemoryManager";    private static final int MAXMEMORY=300*1024*1024;//程序运行的最大内存 模拟器(0-16m)    /**     * 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     */    @SuppressWarnings("deprecation")    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     */    @SuppressWarnings("deprecation")    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     */    @SuppressWarnings("deprecation")    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     */    @SuppressWarnings("deprecation")    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);    }}
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