Question

最初，我有一个listview为我做的工作，我会在onCreate Main类中设置clicklistener和long licklistener，如下所示：

listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Intent i = new Intent(getApplicationContext(), UserFeed.class);
            i.putExtra("venueName", businessList.get(position).name);
            i.putExtra("companyId",businessList.get(position).id);
            i.putExtra("canWrite", checkedIn);
            i.putExtra("Lat",businessList.get(position).anchorpt.getLatitude());
            i.putExtra("Lon",businessList.get(position).anchorpt.getLongitude());
            i.putExtra("NotType",venueType);
            startActivity(i);

        }
    });

    listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
            Double Lat = businessList.get(position).anchorpt.getLatitude();
            Double Lon = businessList.get(position).anchorpt.getLongitude();
            ArrayList<Marker> markers = new ArrayList<>();
            LatLngBounds.Builder builder = new LatLngBounds.Builder();
            mMap.clear();
            markers.add(mMap.addMarker(new MarkerOptions().position(new LatLng(point.getLatitude(), point.getLongitude()))
                    .icon(BitmapDescriptorFactory.defaultMarker())
                    .title("My Location")
                    .visible(false)));
            markers.add(mMap.addMarker(new MarkerOptions().position(new LatLng(Lat, Lon))
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))
                    .visible(true)));

            for (Marker marker : markers){
                builder.include(marker.getPosition());
            }
            LatLngBounds bounds = builder.build();
            int padding = 100;
            CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds,padding);
            mMap.animateCamera(cu);
            return true;
        }
    });

我试图用recyclerview做同样的方法，但没有成功。我可以在recylcerviewadapter中完成，但我不确定如何添加标记。它看起来像这样：

 public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener{
    public TextView tvName,tvDistance,tvAgeRange,tvUserCount,tvGenderRatio,tvTimeDetails;

    public ViewHolder(View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        //itemView.setOnLongClickListener(this);

        tvName = (TextView) itemView.findViewById(R.id.venueName);
        tvDistance = (TextView) itemView.findViewById(R.id.textDistance);
        tvAgeRange = (TextView) itemView.findViewById(R.id.textAgeRange);
        tvUserCount = (TextView) itemView.findViewById(R.id.textUserCount);
        tvGenderRatio = (TextView) itemView.findViewById(R.id.textGenderRatio);
        tvTimeDetails = (TextView) itemView.findViewById(R.id.whenLitOccurs);
    }


    @Override
    public void onClick(View view) {
        //context.startActivity(new Intent(context, UserFeed.class));
        int row = getAdapterPosition();
        Log.i("AppInfo","Item clicked"+ items.get(row));
        Intent i = new Intent(context, UserFeed.class);
        i.putExtra("venueName", items.get(row).name);
        i.putExtra("companyId",items.get(row).id);
        //i.putExtra("canWrite", checkedIn);
        i.putExtra("Lat",items.get(row).anchorpt.getLatitude());
        i.putExtra("Lon",items.get(row).anchorpt.getLongitude());
        //i.putExtra("NotType",venueType);
        context.startActivity(i);

    }

    @Override
    public boolean onLongClick(View view) {
        //Add a marker to map
        return true;
    }
}

我正在使用谷歌地图v2。

Answer 1

不要在适配器内执行任何激烈的操作，而是使用回调方法（例如：interface）将click和longclick事件转移到mainactivity

步骤1：为clickListener创建一个界面。

public interface CustomAdapterClickListener {
public void onItemClick(View v, int position);}

步骤2：在recylcerview的构造函数的帮助下，将MainActivity reffrence分配给接口。

public class RecylcerAdapter  extends extends RecyclerView.Adapter<>{
public RecylcerAdapter(Context context, ArrayList<> list,
                       final CustomAdapterClickListener clickListener) {

    this.context = context;
    inflator = LayoutInflater.from(context);
    this.list = list;
    this.clickListener = clickListener;
}

}步骤3：从适配器的onClicks方法调用此接口方法

@Override
public void onClick(View v) {
    clickListener.onItemClick(v,(int)v.getTag());
}

步骤4：在MainActivity中实现界面

public class MaiActivity extends AppCompatActivity implements CustomAdapterClickListener{

@Override
public void onItemClick(View v, int position) {
    // now you have the list item position as well as view , get the adapter data based on the postion
    // add marker with the help of googlemap instance .()
}

}

RecyclerView OnClick传递意图长按添加标记以映射

1 个答案: