判断进程是否存在、Activity是否在前台显示

1、判断进程是否存在

        /**
         * 判断某个进程是否存在
         * 
         * @param packageName
         *            包名（进程名称）
         */
        private boolean isProcessExists(String packageName) {
            if (TextUtils.isEmpty(packageName)) {
                return false;
            }
            boolean isOk = false;
            ActivityManager am = (ActivityManager) MyApplication.getMyApplication().getSystemService(
                    Context.ACTIVITY_SERVICE);
            List list = am.getRunningAppProcesses();
            for (RunningAppProcessInfo appProcess : list) {
                if (appProcess.processName.equals(packageName)) {
                    isOk = true;
                }
            }
            return isOk;
        }
    }

2、判断Activity是否在前台显示

    /**
     * 判断某个界面是否在前台
     * 
     * @param className
     *            activity全路径名
     */
    private boolean isActivityForeground(String className) {
        if (TextUtils.isEmpty(className)) {
            return false;
        }

        ActivityManager am = (ActivityManager) MyApplication.getMyApplication().getSystemService(
                Context.ACTIVITY_SERVICE);
        List list = am.getRunningTasks(1);
        if (list != null && list.size() > 0) {
            ComponentName cpn = list.get(0).topActivity;
            if (className.equals(cpn.getClassName())) {
                return true;
            }
        }
        return false;
    }