布局:
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:onNavigationItemSelected="@{viewModel.onNavigationItemSelected}"
android:background="?android:attr/windowBackground"
app:menu="@menu/menu_home_tab" />
代码:
@BindingAdapter("onNavigationItemSelected")
public static void setOnNavigationItemSelected(
BottomNavigationView view, BottomNavigationView listener) {
view.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_dashboard:
Log.d("test","test1");
return true;
case R.id.navigation_notifications:
Log.d("test","test2");
return true;
}
return false;
}
});
}
这将返回一个错误
Error:(183, 49) Could not find accessor viewmodel.onNavigationItemSelected
我正在尝试在我的bottomnavigationview上实现数据绑定(bind)
最佳答案
您应该在onNavigationItemSelected()
类中声明了viewModel
:
class ViewModel {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_dashboard:
Log.d("test","test1");
return true;
case R.id.navigation_notifications:
Log.d("test","test2");
return true;
}
return false;
}
}
在您的xml中,使用方法引用:app:onNavigationItemSelected="@{viewModel::onNavigationItemSelected}"
关于android - BottomNavigationView在ViewModel内部进行数据绑定(bind),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/46872747/