Adapter 问题 我真的不是很明白！！！

[shenxiaolinil]

11-06 05:58:03.239: ERROR/AndroidRuntime(778): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
package com.shen.sqlite;

import java.util.ArrayList;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class sqlite extends Activity {
/** Called when the activity is first created. */
public static final String bdName = "code.db";
public static final int Version = 1;
private Myhandle handle;
private SQLiteDatabase dataset;
private ArrayAdapter<String> adapt;
private Cursor cursor;
private ArrayList<String> infoList=new ArrayList<String>();

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
handle = new Myhandle(this, bdName, null, Version);
dataset = handle.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Myhandle.COUNTRY, "china");
values.put(Myhandle.CODE, 86);
dataset.insert(Myhandle.TableName, Myhandle.ID, values);
dataset.insert(Myhandle.TableName, Myhandle.ID, null);
values.clear();
values.put(Myhandle.COUNTRY, "usa");
values.put(Myhandle.CODE, 88);
dataset.update(Myhandle.TableName, values, Myhandle.ID + "=2", null);
dataset.execSQL("INSERT INTO " + Myhandle.TableName + "("
+ Myhandle.COUNTRY + "," + Myhandle.CODE + ") VALUES"
+ "('JAP','89')");

values.put(Myhandle.COUNTRY, "china");
cursor = dataset.rawQuery("Select * from " + Myhandle.TableName, null);
// TextView text = new TextView(this);
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
String a = cursor.getString(1);
String b = cursor.getString(2);
infoList.add(a + b);
//
}
ListView sp = (ListView) findViewById(R.id.spinner);
adapt = new ArrayAdapter<String>(this, R.layout.main, infoList);
sp.setAdapter(adapt);
}

public void onDestroy() {
dataset.delete(Myhandle.TableName, null, null);
super.onDestroy();
}
}

[zhangguifeng123]

抛出的异常已经写的很明白呢：
java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
而
adapt = new ArrayAdapter <String>(this, R.layout.main, infoList);
这句中布局main中的布局可能不是TextView对象。

adapt = new ArrayAdapter <String>(A1, A2, A3);
参数A2是一个“resource ID to be a TextView
”

[shenxiaolinil]

这是我main.xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ListView android:id="@+id/spinner" android:layout_width="fill_parent"
android:layout_height="wrap_content"></ListView>
</LinearLayout>

[AngleProgrammer]

adapt = new ArrayAdapter <String>(this, R.layout.main, infoList);
不正确吧

[AngleProgrammer]

第2个参数应该是ListView中每个选择项的样式，可以使用系统自带的android.R.layout.xxx,也可以是自定义的，仅包含TextView。

[download2039]

你的main.xml要更改为：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent"
android:layout_height="wrap_content" />

因为根节点必须是TextView，不然就会抛“ArrayAdapter requires the resource ID to be a TextView”

[Jack_tianzhenhai]

R.layout.main要使用系统提供的显示layout,或者你就自己定义一个显示list的layout.

[kinghua_q]

R.layout.main

只能是一个TextView的layout

[xwanglyxwangly]

你的adapter的资源文件的顶级结点必须是TextView