我是Android新手，我正在使用listview。我试图在类文件中使用xml中的listview和类文件中的适配器来显示数据。我正在研究以下3个文件。
第一个文件：activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.listpractice.MainActivity" >
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"
></ListView>
</RelativeLayout>
第二个文件：row1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight" >
<ImageView
android:id="@+id/icon"
android:contentDescription="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginEnd="10dp"
android:src="@drawable/ic_launcher"
/>
<TextView
android:id="@+id/firstTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_toRightOf="@id/icon"
android:layout_toEndOf="@id/icon"
android:textSize="30sp"
android:text="@string/hello_world"
/>
<TextView
android:id="@+id/secondTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/icon"
android:layout_toEndOf="@id/icon"
android:layout_below="@id/firstTextView"
android:textSize="13sp"
android:text="@string/hello_world"
/>
</RelativeLayout>
第三个文件：MainActivity.java
package com.listpractice;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
public class MainActivity extends ListActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
我的问题：现在我想显示row1.xml的数据，但我没有动态数据。如何使用第三个（.class）文件显示数据。
答案 0 :(得分：0)
您应该阅读this article on Building Layouts with an Adapter。它有一些方便的概念，你需要了解它们。
根本的概念是，您需要将ListView与填充行的Adapter相关联，并将其添加到ListView。
查看您的row1.xml，看起来您需要一组包含;
icon firstTextView secondTextView 您可以构建一个小片段来创建一组预先填充的对象以供测试。
public class YourObject {
private Bitmap icon;
private String text1;
private String text2;
public YourObject(Bitmap icon, String text1, String text2) {
this.icon = icon;
this.text1 = text1;
this.text2 = text2;
}
// GETTERS AND SETTERS
}
然后创建一个集合
List<YourObject> data = new ArrayList<>();
for (int z = 0; z < 5; z++) {
YourObject yourObject = new YourObject(yourIcon, "Text1: " + z, "Text2: " + z);
data.add(yourObject);
}
收藏完成后，您将其发送到Adapter构造函数以及对row1.xml的引用，然后按照指南填充行。
答案 1 :(得分：0)
您需要创建适配器文件
公共类CustomBaseAdapter扩展了BaseAdapter {
Context context;
List<RowItem> rowItems;
public CustomBaseAdapter(Context context, List<RowItem> items) {
this.context = context;
this.rowItems = items;
}
/*private view holder class*/
private class ViewHolder {
ImageView imageView;
TextView txtTitle;
//TextView txtDesc;
ImageView imgarrow;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
//holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
holder.imageView = (ImageView) convertView.findViewById(R.id.icon);
holder.imgarrow=(ImageView)convertView.findViewById(R.id.arrow_icon);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
RowItem rowItem = (RowItem) getItem(position);
//holder.txtDesc.setText(rowItem.getDesc());
holder.txtTitle.setText(rowItem.getTitle());
holder.imageView.setImageResource(rowItem.getImageId());
holder.imgarrow.setImageResource(rowItem.getImg());
return convertView;
}
@Override
public int getCount() {
return rowItems.size();
}
@Override
public Object getItem(int position) {
return rowItems.get(position);
}
@Override
public long getItemId(int position) {
return rowItems.indexOf(getItem(position));
}
}
MainActivity
公共类MainActivity扩展了Activity实现OnItemClickListener {
public static final String[] titles = new String[] { "Krish",
"John Cena", "Kane","Roman Reigns"};
public static final Integer[] images = { R.drawable.fourth,R.drawable.second,R.drawable.first,R.drawable.third};
public static final Integer[] imagearow = {R.drawable.arrow,R.drawable.arrow,R.drawable.arrow,R.drawable.arrow };
ListView listView;
List<RowItem> rowItems;
private ImageView btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.list_item_home);
//list_travels=(ListView)findViewById(R.id.list_travels);
btn=(ImageView)findViewById(R.id.btnaddhotels);
btn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
Intent i=new Intent(HomeScreen.this,Registerhotel_resorts.class);
startActivity(i);
}
});
rowItems = new ArrayList<RowItem>();
for (int i = 0; i < titles.length; i++) {
RowItem item = new RowItem(images[i], titles[i],imagearow[i]);
rowItems.add(item);
}
listView = (ListView) findViewById(R.id.list_hotels);
CustomBaseAdapter adapter = new CustomBaseAdapter(this, rowItems);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Toast toast = Toast.makeText(getApplicationContext(),
"Item " + (position + 1) + ": " + rowItems.get(position),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
Intent i1=new Intent(HomeScreen.this,KrishnaParkResort.class);
startActivity(i1);
}
}