NavigationDrawer RecyclerView selected items change color

问题

I am trying to change the textColor in my NavigationDrawer when item is selected.I am using RecyclerView as my swipe layout. This is based on the tutorial:

http://www.androidhive.info/2015/04/android-getting-started-with-material-design/

Anyone can suggest the solution

Thanks in Advance.

回答1:

Define a static int in NavigationDrawerAdapter class to represent the selected item

In NavigationDrawerAdapter.java

public class NavigationDrawerAdapter extends RecyclerView.Adapter<NavigationDrawerAdapter.MyViewHolder> {
    public static int selected_item = 0;
    ...

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        NavDrawerItem current = data.get(position);
        holder.title.setText(current.getTitle());
        if(position == selected_item)
        {
            holder.title.setTextColor(Color.RED);
        }
        else
        {
            holder.title.setTextColor(Color.BLACK);
        }
    }

    ...

}

In FragmentDrawer.java

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    ...
    recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
        @Override
        public void onClick(View view, int position) {

            NavigationDrawerAdapter.selected_item = position;
            recyclerView.getAdapter().notifyDataSetChanged();
            drawerListener.onDrawerItemSelected(view, position);
            mDrawerLayout.closeDrawer(containerView);
        }

        ...
    }));

    ...
}

回答2:

I have figured out, how to change text color as well as the color of the entire view.

I've updated your FragmentDrawer.java

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflating view layout
    View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
    recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);

    adapter = new NavigationDrawerAdapter(getActivity(), getData());
    recyclerView.setAdapter(adapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() {
        @Override
        public void onClick(View view, int position) {
            view.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
            ((TextView) view.findViewById(R.id.title)).setTextColor(getResources().getColor(R.color.material_blue_grey_800));
            drawerListener.onDrawerItemSelected(view, position);
            mDrawerLayout.closeDrawer(containerView);
        }

        @Override
        public void onLongClick(View view, int position) {

        }
    }));

    return layout;
}

What I've basically done is, in the onClick() method of TouchListener.

view.setBackgroundColor(getResources().getColor(R.color.colorPrimary));

This will change the background color of the view

Similarly since I've reference to the view, I could get reference to the TextView which is used inside layout of Drawer.

((TextView) view.findViewById(R.id.title)).setTextColor(getResources().getColor(R.color.material_blue_grey_800));

回答3:

You can do this:

public class MainActivity extends AppCompatActivity {

    .......

     adapter.setOnItemClickLister(new MenuAdapter.OnItemSelecteListener() {

        View selectedView;

        @Override
        public void onItemSelected(View v, int position) {

            if(selectedView != null)
                selectedView.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), R.color.defaultColor));

            v.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), R.color.orange));

            selectedView = v;
        }
    });


}

来源：https://stackoverflow.com/questions/31045563/navigationdrawer-recyclerview-selected-items-change-color