Android运行时内存信息

系统提供了API，主要在android.os包下,也就是Debug类

ActivityManager mManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
Debug.MemoryInfo[] memInfo = mManager.getProcessMemoryInfo(new int[]{Process.myPid()});
Map<String, String> statsMap = memInfo[0].getMemoryStats();

看下源码：

  /**
         * Returns a map of the names/values of the memory statistics
         * that {@link #getMemoryStat(String)} supports.
         *
         * @return a map of the names/values of the supported memory statistics.
         */
        public Map<String, String> getMemoryStats() {
            Map<String, String> stats = new HashMap<String, String>();
            stats.put("summary.java-heap", Integer.toString(getSummaryJavaHeap()));
            stats.put("summary.native-heap", Integer.toString(getSummaryNativeHeap()));
            stats.put("summary.code", Integer.toString(getSummaryCode()));
            stats.put("summary.stack", Integer.toString(getSummaryStack()));
            stats.put("summary.graphics", Integer.toString(getSummaryGraphics()));
            stats.put("summary.private-other", Integer.toString(getSummaryPrivateOther()));
            stats.put("summary.system", Integer.toString(getSummarySystem()));
            stats.put("summary.total-pss", Integer.toString(getSummaryTotalPss()));
            stats.put("summary.total-swap", Integer.toString(getSummaryTotalSwap()));
            return stats;
        }

如果只想获取某一种内存信息，比如native内存或者graphic内存，可以使用下面个这个方法

 public String getMemoryStat(String statName) {
            switch(statName) {
                case "summary.java-heap":
                    return Integer.toString(getSummaryJavaHeap());
                case "summary.native-heap":
                    return Integer.toString(getSummaryNativeHeap());
                case "summary.code":
                    return Integer.toString(getSummaryCode());
                case "summary.stack":
                    return Integer.toString(getSummaryStack());
                case "summary.graphics":
                    return Integer.toString(getSummaryGraphics());
                case "summary.private-other":
                    return Integer.toString(getSummaryPrivateOther());
                case "summary.system":
                    return Integer.toString(getSummarySystem());
                case "summary.total-pss":
                    return Integer.toString(getSummaryTotalPss());
                case "summary.total-swap":
                    return Integer.toString(getSummaryTotalSwap());
                default:
                    return null;
            }
        }