如何解析符号"列表"？

Question

问题

目前，我正试图在我的应用程序中使用ListView，但当我将ListView的id更改为@android:id/list以修复之前的错误"；我的内容必须包括一个id为android.r.id.list"的ListView；它使得无法在我的CCD_ 3中使用CCD_；无法解析符号"list">

我尝试过的

-使缓存无效

代码主活动.java

package com.example.cakeapp;

import android.app.ListActivity;
import android.content.Intent;
import android.net.Uri;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.Spinner;
import android.widget.TextView;

import com.example.cakeapp.R;

public class MainActivity extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] dessert={"Chocolate Mousse",
"Chocolate Cake",
"Chocolate Macaroons",
"Chocolate Cafe Website",
"Dessert Selection"};

setListAdapter(new ArrayAdapter<String>(this, R.layout.activity_main, R.id.list, dessert));
}
}

代码activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">

<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

编码AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.cakeapp">

<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.CakeApp"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>

</manifest>

Answer 1

您应该使用android:id="+id/list">而不是android:id="@android:id/list">

将activity_main.xml文件编辑为：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>