Android listview with slowness

Question

Android listview with slowness

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#1 by (1 votes)

0

What might be causing slowness?

Code of Adaptador :

public class Adaptador extends BaseAdapter{
    private static LayoutInflater inflater = null;

    Context contexto;
    String[][] datos;
    int[] datosImg;

    public Adaptador(Context conexto, String[][] datos, int[] imagenes)
    {
        this.contexto = conexto;
        this.datos = datos;
        this.datosImg = imagenes;

        inflater = (LayoutInflater)conexto.getSystemService(conexto.LAYOUT_INFLATER_SERVICE);
    }


    @Override
    public View getView(int i, View convertView, ViewGroup parent) {
        final View vista = inflater.inflate(R.layout.elemento_lista, null);

        TextView titulo = (TextView) vista.findViewById(R.id.tvTitulo);
        TextView duracion = (TextView) vista.findViewById(R.id.tvDuracion);
        TextView director = (TextView) vista.findViewById(R.id.tvDirector);

        ImageView imagen = (ImageView) vista.findViewById(R.id.ivImagen);
        RatingBar calificacion = (RatingBar) vista.findViewById(R.id.ratingBarPel);

        titulo.setText(datos[i][0]);
        director.setText(datos[i][1]);
        duracion.setText("Duração " + datos[i][2]);
        imagen.setImageResource(datosImg[i]);
        calificacion.setProgress(Integer.valueOf(datos[i][3]));

        return vista;
    }



    @Override
    public int getCount() {
        return datosImg.length;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }
}

java listview android-adapter

asked by anonymous 24.10.2018 / 21:31

1 answer

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score 1 · Accepted Answer

Your code is not reusing View and is always inflating. The method runs several times and always inflates. You can take advantage of convertView. In this case, do this:

@Override
public View getView(int i, View convertView, ViewGroup parent) {
     View vista = convertView;

    if(vista==null)
        vista = inflater.inflate(R.layout.elemento_lista, parent, false);

    TextView titulo = (TextView) vista.findViewById(R.id.tvTitulo);
    TextView duracion = (TextView) vista.findViewById(R.id.tvDuracion);
    TextView director = (TextView) vista.findViewById(R.id.tvDirector);

    ImageView imagen = (ImageView) vista.findViewById(R.id.ivImagen);
    RatingBar calificacion = (RatingBar) vista.findViewById(R.id.ratingBarPel);

    titulo.setText(datos[i][0]);
    director.setText(datos[i][1]);
    duracion.setText("Duração " + datos[i][2]);
    imagen.setImageResource(datosImg[i]);
    calificacion.setProgress(Integer.valueOf(datos[i][3]));

    return vista;
}

Of course there are other ways to improve, such as using the ViewHolder standard. But in that case it should be that.