将子项添加到 Android 中的列表视图 [英] Adding Subitem to a listview in Android
问题描述
我目前有一个包含几个字符串的列表视图.这些是从 strings.xml 中的字符串数组调用的
I currently have a listview which contains a couple of strings. These are called from a string array in strings.xml
<string name="app_name">Taxi Me</string>
<string-array name="taxi_array">
<item>Barrys Taxi</item>
<item>Boom Taxi</item>
</string-array>
我想做的是为这些创建子项目，以便我可以显示地址和联系方式等字段.我不久前制作了一个自定义列表视图，但无法弄清楚如何使用 strings.xml 文件进行操作?是否有我需要使用的特定标签以便它们显示在列表视图中?
What I was trying to do is create subitems for these so that i can show fields such as address and contact details etc. I made a customlistview a while back but cant work out how I can do it using the strings.xml file? Are there any particular tags I need to use so they show up in the list view?
主要活动代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final String[] taxi = getResources().getStringArray(R.array.taxi_array);
final String[] address = getResources().getStringArray(R.array.taxi_add);
setListAdapter(new ArrayAdapter<String>(this, R.layout.listtaxi, taxi));
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
for (int i = 0; i < taxi.length; i++) {
lv.add(new ListTaxi (taxi[i], address[i]));
}
/*lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
Toast.LENGTH_LONG).show();
}
});
*/
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> a, View v, final int position, long id)
{
final int selectedPosition = position;
AlertDialog.Builder adb=new AlertDialog.Builder(ListTaxi.this);
adb.setTitle("Taxi Booking");
adb.setMessage("You Have Selected: "+lv.getItemAtPosition(position));
adb.setPositiveButton("Book", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent intent = new Intent(getApplicationContext(), Booking.class);
intent.putExtra("booking", taxi[selectedPosition]);
startActivity(intent);
}
});
adb.setNegativeButton("Cancel", null);
adb.show();
}
});
推荐答案
好的，只是为了踢球，我把它放在一起.它可以正确编译和运行，看看您是否可以根据您的特定需求进行调整:
Okay, just for kicks, I threw this together. It compiles and functions correctly, see if you can adapt it for your particular needs:
layout/taxi_list_item.xml
<?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="100dp"
android:padding="10dp"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/taxi_name"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/taxi_address"
/>
</LinearLayout>
layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
TaxiMain.java
package com.test.taxi;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class TaxiMain extends ListActivity {
/** Called when the activity is first created.
* @return */
class Taxi {
private String taxiName;
private String taxiAddress;
public String getName() {
return taxiName;
}
public void setName(String name) {
taxiName = name;
}
public String getAddress() {
return taxiAddress;
}
public void setAddress(String address) {
taxiAddress = address;
}
public Taxi(String name, String address) {
taxiName = name;
taxiAddress = address;
}
}
public class TaxiAdapter extends ArrayAdapter<Taxi> {
private ArrayList<Taxi> items;
private TaxiViewHolder taxiHolder;
private class TaxiViewHolder {
TextView name;
TextView address;
}
public TaxiAdapter(Context context, int tvResId, ArrayList<Taxi> items) {
super(context, tvResId, items);
this.items = items;
}
@Override
public View getView(int pos, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.feed_view, null);
taxiHolder = new TaxiViewHolder();
taxiHolder.name = (TextView)v.findViewById(R.id.taxi_name);
taxiHolder.address = (TextView)v.findViewById(R.id.taxi_address);
v.setTag(taxiHolder);
} else taxiHolder = (TaxiViewHolder)v.getTag();
Taxi taxi = items.get(pos);
if (taxi != null) {
taxiHolder.name.setText(taxi.getName());
taxiHolder.address.setText(taxi.getAddress());
}
return v;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] taxiNames = getResources().getStringArray(R.array.taxi_name_array);
String[] taxiAddresses = getResources().getStringArray(R.array.taxi_address_array);
ArrayList<Taxi> taxiList = new ArrayList<Taxi>();
for (int i = 0; i < taxiNames.length; i++) {
taxiList.add(new Taxi(taxiNames[i], taxiAddresses[i]));
}
setListAdapter(new TaxiAdapter(this, R.layout.taxi_list_item, taxiList));
}
}
_____END EDIT_______
_____END EDIT_______
对于这样的事情，您可能最好使用数据库，以将记录联系在一起.如果你开始使用数组，你可以做的一件事是为你需要的每个项目创建一个单独的数组(例如出租车数组、出租车地址数组、出租车电话数组)，然后在你的代码中创建一个出租车对象:
You'd probably be better off using a database for something like this, to keep the records tied together. If you're set on using arrays, one thing you could do is make a separate array for each item you need (e.g. taxi_array, taxi_address_array, taxi_phone_array) then make a Taxi object in your code:
class Taxi {
String taxiName;
String taxiAddress;
String taxiPhone;
public Taxi(String name, String address, String phone) {
taxiName = name;
taxiAddress = address;
taxiPhone = phone;
}
}
private List<Taxi> taxiList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] taxiNames = getResources().getStringArray("taxi_array");
String[] taxiAddresses = getResources().getStringArray("taxi_address_array");
String[] taxiPhones = getResources().getStringArray("taxi_phone_array");
taxiList = new ArrayList<Taxi>();
for (int i = 0; i < taxiNames.length; i++) {
taxiList.add(new Taxi(taxiNames[i], taxiAddresses[i], taxiPhones[i]));
}
}
(这是未编译的代码，可能需要进行一些调整)但是您将有一个出租车项目列表，其中包含来自不同数组的所有编译信息.数据库仍然是更好的选择(甚至是包含数据的 CSV 文件，位于您的资产中).
(This is uncompiled code, some tweaks may be needed) But then you'll have a List of Taxi items, containing all of the compiled information from the different arrays. A database would still be a much better option (or even a CSV file with the data, in your assets).
这篇关于将子项添加到 Android 中的列表视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
