我编写程序但是当我运行这个程序时,程序有运行时错误:(
LogCat中的错误是:
your content must have a listview whose id attribute is 'android.r.id.list'
我在android:id="@android:id/list"
的activity_main.xml文件中设置了ListView
。
我写了我的代码,请阅读并帮助我。
MainActivity.java:
public class MainActivity extends ListActivity {
private TextView text;
private static final String[] items={"test", "test1" , "test2" , "test3" , "test4" , "test5" , "test6"};
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListAdapter(new ArrayAdapter<String>(this,R.layout.row,R.id.label,items));
text=(TextView)findViewById(R.id.selection);
}
public void onListItemClick(ListView parent,View v,int position,Long id){
text.setText(items[position]);
}
}
activity_main.xml中:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:id="@+id/selection"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"/>
</LinearLayout>
row.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/pic"
android:padding="2dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/pic"/>
<TextView
android:id="@+id/label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
干杯。
答案 0 :(得分:4)
请扩展Activity而不是ListActivity,
然后从布局文件中获取其视图
ListView listView = (ListView) findViewById(R.id.listView);
然后调用listView.setAdapter(/*agruments*/);
方法
而不是调用setListAdapter()。
答案 1 :(得分:2)
你必须获得像
这样的列表视图的实例ListView lv=getListView();
答案 2 :(得分:2)
mainActivity
package com.example.testdemo;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Dialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ListActivity {
private TextView text;
private static final String[] items = { "test", "test1", "test2", "test3",
"test4", "test5", "test6" };
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_);
setListAdapter(new ArrayAdapter<String>(this, R.layout.lable,
R.id.label, items));
text = (TextView) findViewById(R.id.selection);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
text.setText("" + items[position]);
super.onListItemClick(l, v, position, id);
}
}
}
activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/selection"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false" />
</LinearLayout>
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/pic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="2dip"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/label"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
答案 3 :(得分:-3)
更改此行
android:id="@android:id/list"
到
android:id="@+id/list"