Android如何判断一个应用在运行

   在一个应用中,或一个Service 、Receiver中有时候需要判断一个应用是否正在运行,以便进行一些相关的处理,这个时候我们需要得到一个ActivityManager,这个Manager顾名思意就是管理Activity的,它有一个方法叫getRunningTasks,可以得到当前系统正在运行的Task的列表,代码如下:

 

 

ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE); 
List list = am.getRunningTasks(100); 
for (RunningTaskInfo info : list) { 
    if (info.topActivity.getPackageName().equals(MY_PKG_NAME) && info.baseActivity.getPackageName().equals(MY_PKG_NAME)) { 
        isAppRunning = true; 
        //find it, break 
        break; 
    } 
}  

 

 100表示取的最大的任务数,info.topActivity表示当前正在运行的Activity,info.baseActivity表系统后台有此 进程在运行,具体要做如何判断就看自已的业务需求。这个类还有更多的方法可以取得系统运行的服务、内存使用情况等的方法,请各位自行查找。

    有一点要注意,如果想正常运行此方法,请在你的 AndroidManifest.xml 中加入:

  

 

/**
     * 判断应用是否在运行
     * @param context
     * @return
     */
    public boolean isRun(Context context){
        ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
        List list = am.getRunningTasks(100);
        boolean isAppRunning = false;
        String MY_PKG_NAME = "com.ad";
        //100表示取的最大的任务数,info.topActivity表示当前正在运行的Activity,info.baseActivity表系统后台有此进程在运行
        for (RunningTaskInfo info : list) {
            if (info.topActivity.getPackageName().equals(MY_PKG_NAME) || info.baseActivity.getPackageName().equals(MY_PKG_NAME)) {
                isAppRunning = true;
                Log.i("ActivityService isRun()",info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName());
                break;
            }
        }
        
        Log.i("ActivityService isRun()", "com.ad 程序   ...isAppRunning......"+isAppRunning);
        return isAppRunning;
    }

 

 

   Android系统内部状态信息的相关api: 
    得到ActivityManager :

    ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE) 

    ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo(); 

    获取进程内存状态的信息:

     Debug.MemoryInfo[] processMemoryInfo = activityManager.getProcessMemoryInfo(processIds) 

     获取当前运行的service信息:

     List runningServiceInfos = activityManager.getRunningServices(MaxValue);

     获取当前运行的任务信息:

     List runningTaskInfos = activityManager.getRunningTasks(MaxValue);        

      其中runningTaskInfos 的 topActivity就是当前Task的活跃Activity 在getRunningTasks()所返回的Task队列中系统会根据这些Task的活跃度有一个排序,越活跃越是靠前。第一个就是当前活动的Task

 

    

/** 
* 检测某ActivityUpdate是否在当前Task的栈顶 
*/ 
public boolean isTopActivy(String cmdName){ 
        ActivityManager manager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE); 
        List runningTaskInfos = manager.getRunningTasks(1); 
        String cmpNameTemp = null; 
 
 
        if(null != runningTaskInfos){ 
                cmpNameTemp=(runningTaskInfos.get(0).topActivity).toString); 
                Log.e("cmpname","cmpname:"+cmpName); 
        } 
 
 
       if(null == cmpNameTemp)return false; 
       return cmpNameTemp.equals(cmdName); 
} 

 

/**get the launcher status */   
    private  boolean isLauncherRunnig(Context context) {   
            boolean result = false ;   
            List names = getAllTheLauncher();   
            ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE) ;   
            List appList = mActivityManager.getRunningAppProcesses() ;   
            for (RunningAppProcessInfo running : appList) {   
                    if (running.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {   
                            for (int i = 0; i < names.size(); i++) {   
                                    if (names.get(i).equals(running.processName)) {   
                                            result = true ;   
                                            break;   
                                    }   
                            }   
                    }   
            }   
 return result ;   
    }  
/**
* 得到所有的Launcher
*/
private List getAllTheLauncher(){   
        List names = null;   
        PackageManager pkgMgt = this.getPackageManager();   
        Intent it = new Intent(Intent.ACTION_MAIN);      
        it.addCategory(Intent.CATEGORY_HOME);    
        List ra =pkgMgt.queryIntentActivities(it,0);    
        if(ra.size() != 0){   
            names = new ArrayList();   
        }   
        for(int i=0;i< ra.size();i++)       
        {   
        String packageName =  ra.get(i).activityInfo.packageName;   
        names.add(packageName);   
        }     
        return names;   
    } 

android 取当前显示的activity :

ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE); 
ComponentName cn = am.getRunningTasks(1).get(0).topActivity; 
Log.d("", "pkg:"+cn.getPackageName()); 
Log.d("", "cls:"+cn.getClassName()); 

 Android如何判断程序是否在前台运行:

private boolean isTopActivity(){   
        List  tasksInfo = activityManager.getRunningTasks(1);   
 if(tasksInfo.size() > 0){   
            //应用程序位于堆栈的顶层   
            if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){   
                return true;   
            }   
        }   
        return false;   
    }  

 

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