/**
* 方法描述：判断某一应用是否正在运行
* Created by cafeting on 2017/2/4.
* @param context   上下文
* @param packageName 应用的包名
* @return true 表示正在运行，false 表示没有运行
*/
public static boolean isAppRunning(Context context, String packageName) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(100);
    if (list.size() <= 0) {
      return false;
    }
    for (ActivityManager.RunningTaskInfo info : list) {
      if (info.baseActivity.getPackageName().equals(packageName)) {
        return true;
      }
    }
    return false;
}
//获取已安装应用的 uid，-1 表示未安装此应用或程序异常
public static int getPackageUid(Context context, String packageName) {
    try {
      ApplicationInfo applicationInfo = context.getPackageManager().getApplicationInfo(packageName, 0);
      if (applicationInfo != null) {
        Logger.d(applicationInfo.uid);
        return applicationInfo.uid;
      }
    } catch (Exception e) {
      return -1;
    }
    return -1;
}
/**
* 判断某一 uid 的程序是否有正在运行的进程，即是否存活
* Created by cafeting on 2017/2/4.
*
* @param context   上下文
* @param uid 已安装应用的 uid
* @return true 表示正在运行，false 表示没有运行
*/
public static boolean isProcessRunning(Context context, int uid) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningServiceInfo> runningServiceInfos = am.getRunningServices(200);
    if (runningServiceInfos.size() > 0) {
      for (ActivityManager.RunningServiceInfo appProcess : runningServiceInfos){
        if (uid == appProcess.uid) {
          return true;
        }
      }
    }
    return false;
}

String pName = "xxx";
int uid = getPackageUid(context, pName);
if(uid > 0){
  boolean rstA = isAppRunning(context, pName);
  boolean rstB = isProcessRunning(context, uid);
  if(rstA||rstB){
    //指定包名的程序正在运行中
  }else{
    //指定包名的程序未在运行中
  }
}else{
  //应用未安装
}