获取手机内存信息

ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
MemoryInfo info = new MemoryInfo();
manager.getMemoryInfo(info);
StringBuilder sb = new StringBuilder();
sb.append("可用RAM:");
sb.append(info.availMem + "B");
sb.append(",总RAM:");
sb.append(info.totalMem + "B");