Android开发之ActivityManager获取系统信息

1.判断指定的service是否在运行

 1 public static boolean isServiceRunning(Context ctx, String serviceName) {
 2         ActivityManager am = (ActivityManager) ctx
 3                 .getSystemService(Context.ACTIVITY_SERVICE);
 4         List< RunningServiceInfo > runningServices = am.getRunningServices(200); // 获取运行的所有service，100一般可以获取到所有的service.
 5         for ( RunningServiceInfo runningServiceInfo : runningServices ) {
 6             String className = runningServiceInfo.service.getClassName();    //获取到运行服务的类名
 7             if ( className.equals(serviceName) ) { // 假如在运行的service中含有传入的service名称，返回true
 8                 return true;
 9             }
10         }
11         return false;
12     }

 

 

2.获取到系统运行的进程数

1 public static int getRunningTaskCount(Context context) {
2         ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
3         List< ActivityManager.RunningAppProcessInfo > runningAppProcesses = am.getRunningAppProcesses();
4         return runningAppProcesses.size();
5     }

 

 

 

3.获取设备可用内存

1 public static long getAvaliMem(Context context) {
2         ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
3         ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
4         am.getMemoryInfo(outInfo);
5         return outInfo.availMem;
6     }

 

 

4.获取设备总内存

1 public static long getTotalMem(Context context) {
2         ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
3         ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
4         am.getMemoryInfo(outInfo);
5         return outInfo.totalMem;
6     }