MainActivity 如下:
package cn.han.listview01;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends Activity {
private ListView lv_music;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView list1 = (ListView) findViewById(R.id.list1);
String arr1[] = {"1111111111","222222222222","3333333333"};
ArrayAdapter adapter1 = new ArrayAdapter<>(this,R.layout.array_item,arr1);
list1.setAdapter(adapter1);
}
}
2.app 一进去页面
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="cn.han.listview01.MainActivity">
<ListView
android:layout_width="368dp"
android:id="@+id/list1"
android:entries="@array/books"
android:divider="#f00"
android:dividerHeight="2px"
android:padding="10dp"
android:layout_height="wrap_content" />
</android.support.constraint.ConstraintLayout>
3.单个item 页面
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="24dp"
android:padding="10dp"
android:shadowColor="#f0f"
android:shadowDx="4"
android:shadowDy="4"
android:shadowRadius="2"
android:text="TextView" />
</LinearLayout>
现在控制台提示 03-30 16:32:56.357 15648-15648/cn.han.listview01 E/ArrayAdapter: You must supply a resource ID for a TextView
,但是我在 adapter 中是添加了 单个item的 xml 布局的嘛,有谁知道这个怎么回事吗?
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