如何使用c#和ListView显示存储在android数组中的数据

本文关键字：数组 android 数据 存储 何使用 ListView 显示 | 更新日期: 2023-09-27 18:04:23

我目前有以下代码写在 c# 使用Xamarin为Android:

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EditText字段的数据实际上会存储到数组contactArr中吗?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，如果数据已经存储到数组中，我如何去显示列表视图中的数据?代码示例将做我的世界好，因为我不知道去哪里与这个…谢谢。

EDIT With New Code try .

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

如何使用c#和ListView显示存储在android数组中的数据

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Adapter的帮助来处理如何格式化数据。

简单地显示字母数字值从EditText已被分割成一个数组，你可以使用ArrayAdapter，这是内置到Android。

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

ListView需要知道这个适配器，所以你也必须这样做:

contactView.Adapter = myAdapter;

所有这些都是非常基本的东西，你可以在Xamarin开发中心找到很多信息。Xamarin也有一个非常好的GitHub存储库，里面有大量的示例。

编辑:

添加到资源文件夹，命名为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" />

并修改你的ArrayAdapter来匹配:

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