Android判断当前应用程序状态是在前台还是后台，android当前,1 public sta

Android判断当前应用程序状态是在前台还是后台，android当前,1 public sta

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public static boolean isBackground(Context context) {        Log.d("Nat: isBackground.packageName1", context.getPackageName());        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();        for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {            Log.d("Nat: isBackground.processName", appProcess.processName);            if (appProcess.processName.equals(context.getPackageName())) {                Log.d("Nat: isBackground.importance", String.valueOf(appProcess.importance));                if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {                    Log.i("后台", appProcess.processName);                    return true;                }else{                    Log.i("前台", appProcess.processName);                    return false;                }            }        }        return false;    }

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class ForegroundCheckTask extends AsyncTask<Context, Void, Boolean> {        @Override        protected Boolean doInBackground(Context... params) {            final Context context = params[0].getApplicationContext();            return isAppOnForeground(context);        }        private boolean isAppOnForeground(Context context) {            ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);            List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();            if (appProcesses == null) {                return false;            }            final String packageName = context.getPackageName();            Log.d("Nat: isAppOnForeground.packageName", context.getPackageName());            for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {                Log.d("Nat: isAppOnForeground.processName", appProcess.processName);                if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND &amp;&amp; appProcess.processName.equals(packageName)) {                    return true;                }            }            return false;        }    }

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public static boolean isForeground(Context context) {        Log.d("Nat: isBackground.checkPackageName", context.getPackageName());        ActivityManager am  = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<ActivityManager.RunningTaskInfo> runningTasks = am.getRunningTasks(1);        if (runningTasks != null){            // The first in the list of RunningTasks is always the foreground task.            ActivityManager.RunningTaskInfo foregroundTaskInfo = runningTasks.get(0);            String foregroundTaskPackageName = foregroundTaskInfo .topActivity.getPackageName();            Log.d("Nat: isBackground.foregroundTaskPackageName", foregroundTaskPackageName);            if (context.getPackageName().equals(foregroundTaskPackageName)){                return true;            }//            PackageManager pm = context.getPackageManager();//            PackageInfo foregroundAppPackageInfo = pm.getPackageInfo(foregroundTaskPackageName, 0);//            String foregroundTaskAppName = foregroundAppPackageInfo.applicationInfo.loadLabel(pm).toString();        }        return false;    }

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