Android ListView和ArrayAdapter/Arraylist

Question

我对Java/Android完全不熟悉并且坚持使用listviews.

我想要的是在listview中连续4行使用不同的字体样式

rowlayout.xml

<TextView 
    android:id="@+id/1"
    android:visibility="gone"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView 
    android:id="@+id/2"
    android:textSize="30sp"
    android:textStyle="bold"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<TextView 
    android:id="@+id/3"
    android:typeface="sans"
    android:textSize="20sp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

    <TextView 
    android:id="@+id/4"
    android:typeface="sans"
    android:textSize="15sp"
    android:textStyle="italic"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

我在一个单独的xml文件中有这个

results.xml

<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/TitleLbl" >
</Listview>

我的数组适配器看起来像这样

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.rowlayout, R.id.2, Array);
setListAdapter(adapter);

我要做的是获取一个arraylist(包含ID,名称,姓氏和数字)来填充列表视图,以便每个信息都在行中自己的行.

上面的数组适配器工作,但四个信息中的每一个都在它们自己的行中.

有人可以帮忙吗？

(另外,我已经在互联网上搜索并尝试对此进行排序,但似乎无法找到任何可以帮助我的东西)

Answer 1

您可能需要使用自定义阵列适配器的自定义列表视图.例如,请参阅此链接.

内容:

Android HelloListView(http://developer.android.com/resources/tutorials/views/hello-listview.html)教程展示了如何将ListView绑定到一个字符串对象数组,但你可能会很快就会长大.本文将向您展示如何将ListView绑定到自定义对象的ArrayList,以及创建多行ListView.

假设您有某种搜索功能,可以返回人员列表以及地址和电话号码.我们将为每个结果以三个格式化的行显示该数据,并使其可单击.

首先,创建新的Android项目,并创建两个布局文件.默认情况下可能已经创建了Main.xml,因此将其粘贴到:

<?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_height="wrap_content"
  android:text="Custom ListView Contents"
  android:gravity="center_vertical|center_horizontal"
  android:layout_width="fill_parent" />
  <ListView 
   android:id="@+id/ListView01" 
   android:layout_height="wrap_content"
   android:layout_width="fill_parent"/>
</LinearLayout>

接下来,创建一个名为custom_row_view.xml的布局文件.此布局将是ListView中每个单独行的模板.您可以使用几乎任何类型的布局 - 相对,表等,但为此我们只使用线性:

<?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:id="@+id/name"
  android:textSize="14sp" 
  android:textStyle="bold" 
  android:textColor="#FFFF00" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content"/>
 <TextView android:id="@+id/cityState" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content"/>
 <TextView android:id="@+id/phone" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content"/>
</LinearLayout>

现在,添加一个名为SearchResults的对象.粘贴此代码:

public class SearchResults {
 private String name = "";
 private String cityState = "";
 private String phone = "";

 public void setName(String name) {
  this.name = name;
 }

 public String getName() {
  return name;
 }

 public void setCityState(String cityState) {
  this.cityState = cityState;
 }

 public String getCityState() {
  return cityState;
 }

 public void setPhone(String phone) {
  this.phone = phone;
 }

 public String getPhone() {
  return phone;
 }
}

这是我们将填充数据并加载到ArrayList的类.

接下来,您需要一个自定义适配器.这个只是扩展了BaseAdapter,但如果您愿意,可以扩展ArrayAdapter.

public class MyCustomBaseAdapter extends BaseAdapter {
 private static ArrayList<SearchResults> searchArrayList;

 private LayoutInflater mInflater;

 public MyCustomBaseAdapter(Context context, ArrayList<SearchResults> results) {
  searchArrayList = results;
  mInflater = LayoutInflater.from(context);
 }

 public int getCount() {
  return searchArrayList.size();
 }

 public Object getItem(int position) {
  return searchArrayList.get(position);
 }

 public long getItemId(int position) {
  return position;
 }

 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;
  if (convertView == null) {
   convertView = mInflater.inflate(R.layout.custom_row_view, null);
   holder = new ViewHolder();
   holder.txtName = (TextView) convertView.findViewById(R.id.name);
   holder.txtCityState = (TextView) convertView.findViewById(R.id.cityState);
   holder.txtPhone = (TextView) convertView.findViewById(R.id.phone);

   convertView.setTag(holder);
  } else {
   holder = (ViewHolder) convertView.getTag();
  }

  holder.txtName.setText(searchArrayList.get(position).getName());
  holder.txtCityState.setText(searchArrayList.get(position).getCityState());
  holder.txtPhone.setText(searchArrayList.get(position).getPhone());

  return convertView;
 }

 static class ViewHolder {
  TextView txtName;
  TextView txtCityState;
  TextView txtPhone;
 }
}

(这与List14.java API演示基本相同)

最后,我们将它们连接到主类文件中:

public class CustomListView extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayList<SearchResults> searchResults = GetSearchResults();

        final ListView lv1 = (ListView) findViewById(R.id.ListView01);
        lv1.setAdapter(new MyCustomBaseAdapter(this, searchResults));

        lv1.setOnItemClickListener(new OnItemClickListener() {
         @Override
         public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
          Object o = lv1.getItemAtPosition(position);
          SearchResults fullObject = (SearchResults)o;
          Toast.makeText(ListViewBlogPost.this, "You have chosen: " + " " + fullObject.getName(), Toast.LENGTH_LONG).show();
         }  
        });
    }

    private ArrayList<SearchResults> GetSearchResults(){
     ArrayList<SearchResults> results = new ArrayList<SearchResults>();

     SearchResults sr1 = new SearchResults();
     sr1.setName("John Smith");
     sr1.setCityState("Dallas, TX");
     sr1.setPhone("214-555-1234");
     results.add(sr1);

     sr1 = new SearchResults();
     sr1.setName("Jane Doe");
     sr1.setCityState("Atlanta, GA");
     sr1.setPhone("469-555-2587");
     results.add(sr1);

     sr1 = new SearchResults();
     sr1.setName("Steve Young");
     sr1.setCityState("Miami, FL");
     sr1.setPhone("305-555-7895");
     results.add(sr1);

     sr1 = new SearchResults();
     sr1.setName("Fred Jones");
     sr1.setCityState("Las Vegas, NV");
     sr1.setPhone("612-555-8214");
     results.add(sr1);

     return results;
    }
}

请注意,我们首先获取SearchResults对象的ArrayList(通常这将来自外部数据源...),将其传递给自定义适配器,然后设置单击侦听器.侦听器获取被单击的项目,将其转换回SearchResults对象,并执行它需要执行的任何操作.