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我目前使用Xamarin for Android用C#编写了以下代码：

EditText nameText = FindViewById<EditText> (Resource.Id.editName);
        Button btnAddContact = FindViewById<Button> (Resource.Id.btnAddContact);

        ListView contactView = FindViewById<ListView> (Resource.Id.listView1);

        btnAddContact.Click += delegate {
            string[] contactArr = nameText.Text.Split('\n');
        };

首先.. 当单击 btnAddContact 时，输入到 EditText 字段中的数据是否会实际存储到数组 contactArr 中？没有构建错误，所以我不确定它是否会工作..

我的主要问题是，如果数据已存储到数组中，我该如何在列表视图中显示数据？代码示例对我有好处，因为我不知道该去哪里......谢谢。

尝试使用新代码进行编辑。

EditText nameText = FindViewById<EditText> (Resource.Id.editName);
        Button btnAddContact = FindViewById<Button> (Resource.Id.btnAddContact);

        ListView contactView = FindViewById<ListView> (Resource.Id.listView1);


        btnAddContact.Click += delegate {
            string[] contactArr = nameText.Text.Split('\n');

            var myAdapter = new ArrayAdapter(this, Resource.Id.listView1, contactArr);
            contactView.Adapter = myAdapter;
        };

编辑错误列表：

You must supply a resource ID for a TextView Shutting down VM FATAL EXCEPTION: main java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) at android.widget.AbsListView.obtainView(AbsListView.java:2159) at android.widget.ListView.measureHeightOfChildren(ListView.java:1246) at android.widget.ListView.onMeasure(ListView.java:1158) at android.view.View.measure(View.java:15518) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052) at android.widget.LinearLayout.onMeasure(LinearLayout.java:590) at android.view.View.measure(View.java:15518) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:15518) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.view.View.measure(View.java:15518) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) at android.view.View.measure(View.java:15518) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) at android.view.View.measure(View.java:15518) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) at android.view.Choreographer.doCallbacks(Choreographer.java:562) at android.view.Choreographer.doFrame(Choreographer.java:532) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) at android.os.Handler.handleCallback(Handler.java:725) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5041) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379) ... 45 more

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1 回答 1

1

ListView是一个愚蠢的控件，它不知道如何处理数据本身，所以它需要一个Adapter负责如何格式化数据的帮助。

要简单地显示EditText已拆分为数组的字母数字值，您可以使用ArrayAdapterAndroid 内置的 a。

var myAdapter = new ArrayAdapter(this, Resource.Layout.SimpleListItem1, contactArr);

ListView需要了解此适配器，因此您还必须执行以下操作：

contactView.Adapter = myAdapter;

所有这些都是非常基本的东西，您可以在Xamarin 开发人员中心找到很多信息。Xamarin 还有一个非常不错的GitHub 存储库，其中包含大量示例。

编辑：

将此添加到资源文件夹并调用它TextViewItem.xml：

<?xml version="1.0" encoding="UTF-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/textItem" 
    android:textSize="44sp"       
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />

并更改您的 ArrayAdapter 以匹配此：

var myAdapter = new ArrayAdapter(this, Resource.Layout.TextViewItem, contactArr);
于 2013-03-18T13:12:17.360 回答