Question

我是Android Studio新手。对我来说listview存在问题。我已正确设置所有ID，但问题仍然存在。

XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.example.prashanthwagle.myapplication.MainActivity">

<ListView
    android:id="@+id/sample"
    android:layout_width="368dp"
    android:layout_height="495dp"
    tools:layout_editor_absoluteY="8dp"
    tools:layout_editor_absoluteX="8dp" />
</RelativeLayout>

爪哇：

package com.example.prashanthwagle.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
String[] s={"asfasaf","bafaf","cbfbd"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ListView listView = (ListView)findViewById(R.id.sample);


    ArrayAdapter<String> a = new ArrayAdapter<String>
    (this,R.layout.activity_main,s);

    listView.setAdapter(a);

}
}

Answer 1

我认为你应该改变

ArrayAdapter<String> a = new ArrayAdapter<String>
    (this,R.layout.activity_main,s)

到

 ArrayAdapter<String> a = new ArrayAdapter<String>
    (this,android.R. android.R.layout.simple_list_item_1,s);

Answer 2

您为ArrayAdapter设置了错误的布局。使用此：

ArrayAdapter<String> a = new ArrayAdapter<String>
    (this,android.R.layout.simple_list_item_1,s);

适配器初始化和赋值中的布局引用不应该是活动的布局引用。基本上，此参数告诉ListView列表的每一行具有哪种类型的布局。从这里了解更多相关信息：https://developer.android.com/guide/topics/ui/layout/listview.html

Listview小部件在Android Studio中不起作用

2 个答案: