下拉菜单为Android中的每个自定义ListView项目

Question

我有一个自定义列表视图，其中每个项目包含一个imageview和一个textview。我希望用户能够点击每个项目，并从下拉菜单中选择一个新的imageview + textview组合。

下面是活动代码

public class VisKvittering extends AppCompatActivity { 

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




    String[] data = {"Old El Paso Papadums", "Redbull 0.33L", "Colgate Max White", "Kornbrød Sammenbakt", "Laksefilet m/skinn"}; 

    Integer[] icons = { 
      R.drawable.transpbeef, 
      R.drawable.flaske, 
      R.drawable.kylling2, 
      R.drawable.transpbeef, 
      R.drawable.transpbeef, 

    }; 

    String[] names = { 
      "Rødt kjøtt", 
      "Hvitt kjøtt", 
      "Fisk", 
      "Meieriprodukter" 

    }; 



    CustomList customAdapter = new CustomList(VisKvittering.this, data, icons); 


    int counter = 0; 
    for (String product : data){ 
     counter+= 1; 
     if (categorizer(product) == 0) { 
      icons[counter] = R.drawable.question; 
      customAdapter.setFlag(counter); 


     } 
    } 


    ListView list = (ListView) findViewById(R.id.list); 
    list.setAdapter(customAdapter); 




} 



//placeholder categorizer method 
private int categorizer(String product){ 
    if (product.charAt(0) == 'C'){ 
     return 0; 
    } else { 
     return 1; 
    } 
}} 

下面是CustomList适配器类

public class CustomList extends ArrayAdapter<String>{ 

private final Activity context; 
private final String[] products; 
private final Integer[] imageId; 
public CustomList(Activity context, 
        String[] products, Integer[] imageId) { 
    super(context, R.layout.list_single, products); 
    this.context = context; 
    this.products = products; 
    this.imageId = imageId; 

} 
int flag = -1; 


@Override 
public View getView(int position, View view, ViewGroup parent) { 
    LayoutInflater inflater = context.getLayoutInflater(); 
    View rowView= inflater.inflate(R.layout.list_single, null, true); 
    TextView txtTitle = (TextView) rowView.findViewById(R.id.txt); 

    ImageView imageView = (ImageView) rowView.findViewById(R.id.img); 
    txtTitle.setText(products[position]); 
    //int colorPos = position % colors.length; 
    if (position == flag){ 
     txtTitle.setTextColor(Color.RED); 
    } else { 
     txtTitle.setTextColor(Color.BLACK); 
    } 
    imageView.setImageResource(imageId[position]); 
    return rowView; 
} 

public void setFlag(int position){ 
    this.flag = position; 
}} 

这里的代码列表项

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 
    <TableRow> 
     <ImageView 
      android:id="@+id/img" 
      android:layout_width="50dp" 
      android:layout_height="50dp"/> 

     <TextView 
      android:id="@+id/txt" 
      android:textColor="@color/black" 
      android:layout_width="wrap_content" 
      android:gravity="center_vertical" 
      android:layout_height="50dp" /> 
    </TableRow> 
</TableLayout> 

Answer 1

如果我理解XML你的问题，你应该看看simple_expandable_list_item_1及其适配器。