Android 判断app是否在前台还是在后台运行

android 判断app是否在前台还是在后台运行，直接看代码，可直接使用。

[java] view

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public static boolean isbackground(context context) {  

        activitymanager activitymanager = (activitymanager) context  

                .getsystemservice(context.activity_service);  

        list<runningappprocessinfo> appprocesses = activitymanager  

                .getrunningappprocesses();  

        for (runningappprocessinfo appprocess : appprocesses) {  

            if (appprocess.processname.equals(context.getpackagename())) {  

                /* 

                background=400 empty=500 foreground=100 

                gone=1000 perceptible=130 service=300 isible=200 

                 */  

                log.i(context.getpackagename(), "此appimportace ="  

                        + appprocess.importance  

                        + ",context.getclass().getname()="  

                        + context.getclass().getname());  

                if (appprocess.importance != runningappprocessinfo.importance_foreground) {  

                    log.i(context.getpackagename(), "处于后台"  

                            + appprocess.processname);  

                    return true;  

                } else {  

                    log.i(context.getpackagename(), "处于前台"  

                    return false;  

                }  

            }  

        }  

        return false;  

    }