У меня есть собственный просмотр списка со многими текстами и изображениями (около 60 изображений), и при прокрутке он очень запаздывает.Я добавил ViewHolder в свой код, но он все еще запаздывает.Я знаю, что решение, вероятно, заключается в использовании фонового потока, но я не знаю, как это сделать.Ребята, вы можете мне помочь?
CustomAdapter.java:
public class CustomAdapter extends RecyclerView.Adapter<CustomViewHolder> {
//Attributi:
private Context context;
private int[] immagineDio;
private String[] nomeDio;
//Costruttori:
public CustomAdapter(Context context, int[] immagineDio, String[] nomeDio){
this.context = context;
this.immagineDio = immagineDio;
this.nomeDio = nomeDio;
}
//Metodi di istanza:
@NonNull
@Override
public CustomViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return CustomViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.listview_item, parent, false));
}
@Override
public void onBindViewHolder(@NonNull CustomViewHolder holder, int position) {
holder.bind(immagineDio[position], nomeDio[position]);
}
@Override
public int getItemCount() {
return nomeDio.length;
}
}
CustomViewHolder.java:
public class CustomViewHolder extends RecyclerView.ViewHolder {
ImageView mFlag;
TextView mName;
public CustomViewHolder(@NonNull View itemView) {
super(itemView);
mFlag = itemView.findViewById(R.id.imageView);
mName = itemView.findViewById(R.id.textView);
}
//binding data with UI
void bind(int imageId, String name) {
mFlag.setImageResource(imageId);
mName.setText(name);
} }
ListViewActivity.java:
public class ListViewActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_layout);
String[] nomeDei = {"Baldr","Borr","Bragi","Dagr","Dellingr","Eir","Eostre","Forseti","Freya","Freyr","Frigg","Fulla","Gefjun","Gerðr","Gullveig","Heimdallr","Hel","Hermóðr","Höðr","Hœnir","Iðunn","Itreksjóð","Jǫrð","Kvasir","Lóðurr","Lofn","Logi","Lýtir","Máni","Mímir","Móði","Nanna","Njörun","Njörðr","Nótt","Óðr","Rán","Ríg","Sága","Sif","Signe","Sigyn","Sinfjötli","Sjöfn","Skaði","Skirnir","Snotra","Sól","Syn","Thor","Týr","Ullr","Váli","Vár","Ve","Viðarr","Víli","Vör"};
int[] immagineDei = {
R.drawable.profilo_baldr,
R.drawable.profilo_borr,
R.drawable.profilo_bragi,
R.drawable.profilo_dagr,
R.drawable.profilo_dellingr,
R.drawable.profilo_eir,
R.drawable.profilo_eostre,
R.drawable.profilo_forseti,
R.drawable.profilo_freya,
R.drawable.profilo_freyr,
R.drawable.profilo_frigg,
R.drawable.profilo_fulla,
R.drawable.profilo_gefjun,
R.drawable.profilo_geror,
R.drawable.profilo_gullveig,
R.drawable.profilo_heimdallr,
R.drawable.profilo_hel,
R.drawable.profilo_hermoor,
R.drawable.profilo_hoor,
R.drawable.profilo_hoenir,
R.drawable.profilo_iounn,
R.drawable.profilo_itreksjoo,
R.drawable.profilo_joro,
R.drawable.profilo_kvasir,
R.drawable.profilo_loourr,
R.drawable.profilo_lofn,
R.drawable.profilo_logi,
R.drawable.profilo_lytir,
R.drawable.profilo_mani,
R.drawable.profilo_mimir,
R.drawable.profilo_modi,
R.drawable.profilo_nanna,
R.drawable.profilo_njorun,
R.drawable.profilo_njoror,
R.drawable.profilo_nott,
R.drawable.profilo_oor,
R.drawable.profilo_ran,
R.drawable.profilo_rig,
R.drawable.profilo_saga,
R.drawable.profilo_sif,
R.drawable.profilo_signe,
R.drawable.profilo_sigyn,
R.drawable.profilo_sinfjotli,
R.drawable.profilo_sjofn,
R.drawable.profilo_skaoi,
R.drawable.profilo_skirnir,
R.drawable.profilo_snotra,
R.drawable.profilo_sol,
R.drawable.profilo_syn,
R.drawable.profilo_thor,
R.drawable.profilo_tyr,
R.drawable.profilo_ullr,
R.drawable.profilo_vali,
R.drawable.profilo_var,
R.drawable.profilo_ve,
R.drawable.profilo_vidar,
R.drawable.profilo_vili,
R.drawable.profilo_vor,
};
ListView listViewReference = findViewById(R.id.listView);
CustomAdapter customAdapter = new CustomAdapter(ListViewActivity.this, immagineDei, nomeDei);
listViewReference.setAdapter(customAdapter); //this line gives an error
} }
listview_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" /> </android.support.constraint.ConstraintLayout>