Android开发之ActivityManager获取系统信息

1.判断指定的service是否在运行

public static boolean isServiceRunning(Context ctx, String serviceName) {
        ActivityManager am = (ActivityManager) ctx
                .getSystemService(Context.ACTIVITY_SERVICE);
        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.
        for ( RunningServiceInfo runningServiceInfo : runningServices ) {
            String className = runningServiceInfo.service.getClassName();    //获取到运行服务的类名
            if ( className.equals(serviceName) ) { // 假如在运行的service中含有传入的service名称，返回true
                return true;
            }
        }
        return false;
    }

2.获取到系统运行的进程数

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

3.获取设备可用内存

public static long getAvaliMem(Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
        am.getMemoryInfo(outInfo);
        return outInfo.availMem;
    }

4.获取设备总内存

public static long getTotalMem(Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
        am.getMemoryInfo(outInfo);
        return outInfo.totalMem;
    }