TextView 数据绑定 android:drawableBottom.

Question

我正在Activity类中使用数据绑定来膨胀TabLayout布局。在这一点上，我被困在TextView内部android:drawableBottom的数据绑定中。我的布局代码如下：

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android" >
<data>
    <variable
        name="item"
        type="<package-name>.HomeTabItem"/>
</data>
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:maxLines="1"
    android:text="@={item.name}"
    android:textColor="@color/white"
    android:drawableBottom="<What I have to-do here>"
    android:textSize="@dimen/dimen_18" />
</layout>

用于在 Activity 类内部绑定的 java 代码如下：

private void setTabsLayoutItems() {
    String tabItems[] = getResources().getStringArray(R.array.home_tab_items);
    TypedArray tabItemsDrawable = getResources().obtainTypedArray(R.array.home_tab_items_drawable);
    for (int i = 0; i < tabItems.length; i++) {
        CustomTabBinding binding = DataBindingUtil.inflate(getLayoutInflater(), R.layout.custom_tab, tabLayout, false);
        int id = tabItemsDrawable.getResourceId(i, -1);
        HomeTabItem obj = new HomeTabItem();
        obj.setName(tabItems[i]);
        obj.setIcon(id);
        binding.setItem(obj);
        View cropsTab = binding.getRoot();
        tabLayout.addTab(tabLayout.newTab().setCustomView(cropsTab));
    }
    tabItemsDrawable.recycle();
}

HomeTabItem类如下：

public class HomeTabItem extends BaseObservable {
    private String name;
    private int icon;
    @Bindable
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
        notifyPropertyChanged(com.sdei.farmx.BR.name);
    }
    @Bindable
    public int getIcon() {
        return icon;
    }
    public void setIcon(int icon) {
        this.icon = icon;
        notifyPropertyChanged(com.sdei.farmx.BR.icon);
    }
}

Answer 1

尝试直接设置 iconID，如下所示：

android:drawableBottom="@{item.icon}"

如果它不起作用，则必须创建自定义绑定来设置它。为此，请创建一个名为 Bindings 的最终类并添加以下方法：

@BindingAdapter({"icon"})
    public static void icon(TextView view, int iconId) {
       view.setCompoundDrawables(null,null,null, view.getContext().getDrawable(iconId));  
}

并在布局中调用它：

<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:maxLines="1"
    android:text="@={item.name}"
    android:textColor="@color/white"
    app:icon="@{item.icon}"
    android:textSize="@dimen/dimen_18" />
</layout>