获取到剩余内存

public static long getAvailMem(Context context) {
// 得到进程管理者
ActivityManager activityManager = (ActivityManager) context
.getSystemService(context.ACTIVITY_SERVICE);
MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
// 获取到内存的基本信息
activityManager.getMemoryInfo(memoryInfo);
// 获取到剩余内存
return memoryInfo.availMem;
}