我有一个组合框并且有一个列表中的东西......列表中的东西数量没有设置.它正在从文件夹中收集数据,你可以在组合框中有无限的(有点夸张)数量的项目...我怎么知道用户选择哪个选项?
我尝试了下面的代码,但它不起作用.我是C#的新手,不知道我做错了什么.
comboBox1.SelectedIndex = 0;
comboBox1.Refresh();
if(comboBox1.SelectedIndex = 0)
{
//setting the path code goes here
}
Run Code Online (Sandbox Code Playgroud) 奇怪的是......这次没有代码但是使用System.ServiceProcess; import在导入的ServiceProcess部分下获得一条红线.
有谁知道为什么?是否有一个替代这个类,以便我仍然可以启动和停止Windows服务?
所以我希望能够在标签上显示消息而不点击标签.
public void servicestatus_Click_1(object sender, EventArgs e)
{
var mavbridgeservice = new System.ServiceProcess.ServiceController("MavBridge");
if (mavbridgeservice.Status == ServiceControllerStatus.Running)
{
servicestatus.Text = ("The service is running!");
}
else
{
servicestatus.Text = "The service is stopped!";
}
}
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我在(对象发送者,EventArgs e)中绑定了put(null,null),但这给出了错误,我不知道为什么.我内部的代码与任何点击都没有任何关联.
我被困在如何检查100x100矩阵中有多少数字大于25.下面是我到目前为止的代码:
loop = 1:100;
RandomNumbers = normrnd(0, 25, [100, 100]);
NumberCounter = 0;
for i = 1:10000
if i >= 1
if (RandomNumbers(loop, 100) > 25)
NumberCounter = NumberCounter + 1
elseif (RandomNumbers(100, loop) > 25)
NumberCounter = NumberCounter + 1
end
end
end
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我的NumberCounter变量没有更新......它只是保持为零.感谢任何帮助,以及为什么你做了你做的事情的解释,因为我想学习.
我得到了我的设备的经度和纬度,但这需要30秒到一分钟.有什么建议可以减少时间吗?
public class MainActivity extends Activity
{
public String zipcode;
public double latG;
public double lonG;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabled = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!enabled)
{
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.getLastKnownLocation(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener()
{
public void onLocationChanged(Location location)
{
if (location != null)
{
latG = location.getLatitude();
lonG = location.getLongitude();
Toast.makeText(MainActivity.this,
latG + " " + lonG,
Toast.LENGTH_LONG).show();
} …
Run Code Online (Sandbox Code Playgroud) 我有代码搜索目录并挑选出所有文件夹,但我只想要它选择那些以数据开头的文件夹.我该怎么办?
以下是我通过目录的代码:
string[] filePaths = Directory.GetDirectories(defaultPath).Where(Data => !Data.EndsWith(".")).ToArray();
Run Code Online (Sandbox Code Playgroud) 我想替换我自己的列表而不是android.R.layout.simple_list_item_1但是我得到以下错误06-15 18:28:29.604:E/AndroidRuntime(3291):java.lang.IllegalStateException:ArrayAdapter需要资源ID一个TextView引起的:java.lang.ClassCastException:android.widget.RelativeLayout无法强制转换为android.widget.TextViewatandroid.widget.ArrayAdapter.createViewFromResource我无法设法解决它我的新列表看起来像这样
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:textColor="#FFFFFF"
android:background="@drawable/burger_bg_selector"
android:textAppearance="?android:attr/textAppearanceMedium" />
<View
android:id="@+id/view1"
android:layout_width="wrap_content"
android:layout_height="1dp"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:background="@drawable/main_list_sep"/>
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我的java类看起来像这样
public class MenuFragment extends ListFragment {
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.burger_list, new String[] { " First", " Second", " Third", " Fourth", " Fifth", " Sixth"}));
getListView().setCacheColorHint(0);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
((MenuActivity)getActivity()).getSlideoutHelper().close(); …
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