Android開發之ActivityManager獲取系統信息

1.判斷指定的service是否在運行

public static boolean isServiceRunning(Context ctx, String serviceName) {
        ActivityManager am = (ActivityManager) ctx
                .getSystemService(Context.ACTIVITY_SERVICE);
        List< RunningServiceInfo > runningServices = am.getRunningServices(200); // 獲取運行的所有service，100一般可以獲取到所有的service.
        for ( RunningServiceInfo runningServiceInfo : runningServices ) {
            String className = runningServiceInfo.service.getClassName();    //獲取到運行服務的類名
            if ( className.equals(serviceName) ) { // 假如在運行的service中含有傳入的service名稱，返回true
                return true;
            }
        }
        return false;
    }

 

 

2.獲取到系統運行的進程數

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

 

 

 

3.獲取設備可用內存

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.獲取設備總內存

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;
    }