Android:如何检查剩余多少内存?

时间:2011-05-20 14:54:52

标签: android

下面是我的公式,用于检查剩余多少内存(不是当前堆中剩余多少内存,而是在应用程序崩溃之前可以使用多少内存)。我不是很确定这是对的,不是吗?

double max = Runtime.getRuntime().maxMemory(); //the maximum memory the app can use
double heapSize = Runtime.getRuntime().totalMemory(); //current heap size
double heapRemaining = Runtime.getRuntime().freeMemory(); //amount available in heap
double nativeUsage = Debug.getNativeHeapAllocatedSize(); //is this right? I only want to account for native memory that my app is being "charged" for.  Is this the proper way to account for that?

//heapSize - heapRemaining = heapUsed + nativeUsage = totalUsage
double remaining = max - (heapSize - heapRemaininng + nativeUsage); 

2 个答案:

答案 0 :(得分:22)

尝试以下代码。这应该会给你你想要的结果(特别是Pss字段)。您可以阅读更多相关信息here

Debug.MemoryInfo memoryInfo = new Debug.MemoryInfo();
Debug.getMemoryInfo(memoryInfo);

String memMessage = String.format(
    "Memory: Pss=%.2f MB, Private=%.2f MB, Shared=%.2f MB",
    memoryInfo.getTotalPss() / 1024.0,
    memoryInfo.getTotalPrivateDirty() / 1024.0,
    memoryInfo.getTotalSharedDirty() / 1024.0);

答案 1 :(得分:3)

这是一个旧线程,但这似乎有效:

  Runtime.getRuntime().gc();
  long memoryAvailable = (Runtime.getRuntime().maxMemory() -
        Runtime.getRuntime().totalMemory() +
        Runtime.getRuntime().freeMemory());

totalMemory-freeMemory是当前使用的内存。

所以归结为:

(maximum possible memory)-(current used memory)

编辑添加:freeMemory不计算可用于垃圾收集的内存,因此您可以尝试Runtime.getRuntime()。gc(),尽管意识到它可能有自己的后果(如果在UI线程上运行时会出现视觉打嗝)