android - 当列表中有不同的布局时从列表项中检索值

Question

我有一个包含不同 xml 布局的 ListView ，每个布局都有不同的 View 。我想知道如何在 onItemClick 方法内从用户点击的项目内的 View 中获取数据。

我的 ListView 由多个布局组成，因此在调用 onItemClick 方法时我无法确定按下了哪个布局。例如， ListView 中布局中的一项是:

// list_item.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

    <TextView
        android:id="@+id/lblSub"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:padding="6dp"
        android:layout_marginRight="4dp"
        android:text=""
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/lblMain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:padding="6dp"
        android:layout_marginLeft="4dp"
        android:text=""
        android:textColor="#FFFFFF"
        android:textSize="18sp" />

</RelativeLayout>

ListView 中的另一个布局可能是:

// list_item_name.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="match_parent" >

    <TextView
        android:id="@+id/lblName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="4dp"
        android:padding="4dp"
        android:text="TextView"
        android:textColor="#FFFFFF"
        android:textSize="28sp" />

</RelativeLayout>

所以我不知道如何为 ListView 中的任何布局获取所有这些 View 的数据。

我之前的尝试是这样的:

public void onItemClick(AdapterView<?> listView, View view, int position, long id) {            
    Object obj = adapter.getItem(position);
    String value = obj.toString();
}

但是 value 在这种情况下，返回一个包含该项目内所有 View 的所有值的字符串，例如:{caption=MobileNumber, value=07000123456} <<< 我不能对这个字符串做任何事情，除非我尝试使用 substring 将它分开，考虑到这些值可能是由用户创建的，这充其量是不可靠的。

这是我正在使用的适配器(感谢 Jeff Sharkey ，我没有创建这个适配器):

public class SeparatedListAdapter extends BaseAdapter {  

    public final Map<String,Adapter> sections = new LinkedHashMap<String,Adapter>();  
    public final ArrayAdapter<String> headers;  
    public final static int TYPE_SECTION_HEADER = 0;  

    public SeparatedListAdapter(Context context) {  
        headers = new ArrayAdapter<String>(context, R.layout.list_header);  
    }  

    public void addSection(String section, Adapter adapter) {  
        this.headers.add(section);  
        this.sections.put(section, adapter);  
    }
    public void addSectionNoHeader(String section, Adapter adapter) {
        this.sections.put(section, adapter);
    }

    public Object getItem(int position) {  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return section;  
            if(position < size) return adapter.getItem(position - 1);  

            // otherwise jump into next section  
            position -= size;  
        }  
        return null;  
    }  

    public int getCount() {  
        // total together all sections, plus one for each section header  
        int total = 0;  
        for(Adapter adapter : this.sections.values())  
            total += adapter.getCount() + 1;  
        return total;  
    }  

    public int getViewTypeCount() {  
        // assume that headers count as one, then total all sections  
        int total = 1;  
        for(Adapter adapter : this.sections.values())  
            total += adapter.getViewTypeCount();  
        return total;  
    }  

    public int getItemViewType(int position) {  
        int type = 1;  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return TYPE_SECTION_HEADER;  
            if(position < size) return type + adapter.getItemViewType(position - 1);  

            // otherwise jump into next section  
            position -= size;  
            type += adapter.getViewTypeCount();  
        }  
        return -1;  
    }  

    public boolean areAllItemsSelectable() {  
        return false;  
    }  

    public boolean isEnabled(int position) {  
        return (getItemViewType(position) != TYPE_SECTION_HEADER);  
    }  

    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
        int sectionnum = 0;  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return headers.getView(sectionnum, convertView, parent);  
            if(position < size) return adapter.getView(position - 1, convertView, parent);  

            // otherwise jump into next section  
            position -= size;  
            sectionnum++;  
        }  
        return null;  
    }  

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

}  

我正在寻找一种方法来提取项目内所有 View 的值。但被点击的项目可能是任何布局之一这一事实让我感到困惑。有什么想法吗？

这是我如何在代码中使用此适配器的示例:

SeparatedListAdapter adapter;
Customer cust;
ListView lvDetails;

public Map<String,?> createDoubleItem(String title, String caption) {  
        Map<String,String> item = new HashMap<String,String>();  
        item.put(ITEM_VALUE, title);  
        item.put(ITEM_CAPTION, caption);  
        return item;  
    }

    public Map<String,?> createSingleItem(String name) {  
        Map<String,String> item = new HashMap<String,String>();  
        item.put(ITEM_VALUE, name);
        return item;
    } 

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_customer);

        Intent intent = getIntent();
        cust = Db.Functions.getCustomer(intent.getStringExtra("uuid"));
        lvDetails = (ListView) findViewById(R.id.custdetails);
        adapter = new SeparatedListAdapter(this);
        lvDetails.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> listView, View view, int position, long id) {
                Gen.popup("Item clicked");
            }
        });

        // Name
        List<Map<String,?>> name = new LinkedList<Map<String,?>>();
        if (cust.firstName == null && cust.lastName == null)
            name.add(createSingleItem("Unnamed Customer"));
        else
            name.add(createSingleItem(
                    ((cust.title != null) ? cust.title + " " : "") +
                    ((cust.firstName != null) ? cust.firstName + " " : "") +
                    ((cust.lastName != null) ? cust.lastName : "")));
        adapter.addSection("Name", new SimpleAdapter(this, name, R.layout.list_item_name,   
                new String[] { ITEM_VALUE },
                new int[] { R.id.lblName }));
        // Phones
        if ((cust.mobileNumber != null || cust.homeNumber != null || cust.workNumber != null) && SHOW_PHONES)
        {
            List<Map<String,?>> phone = new LinkedList<Map<String,?>>();
            if (cust.mobileNumber != null)
                phone.add(createDoubleItem(cust.mobileNumber, "Mobile"));
            if (cust.homeNumber != null)
                phone.add(createDoubleItem(cust.homeNumber, "Home"));
            if (cust.workNumber != null)
                phone.add(createDoubleItem(cust.workNumber, "Work"));
            adapter.addSection("Phone", new SimpleAdapter(this, phone, R.layout.list_item,   
                    new String[] { ITEM_VALUE, ITEM_CAPTION },
                    new int[] { R.id.lblSub, R.id.lblMain }));
        }  
        lvDetails.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }
}

Answer 1

这是一个简单的方法 - 将其粘贴到每个 xml View 中:

android:onClick="someFunction"

然后在这个 someFunction 中做:

public void someFunction(View v){

switch (v.getId()){
case R.id.lblSub:
  // This layout was clicked, do something about it
  break;

case R.id.lblMain:
  // This layout was clicked, do something about it
  break;

}