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我是新來的android。我有問題，我不知道如何在我的項目中添加無盡的recyclerview。以下是我的項目代碼。現在在我的recyclerview中，我可以使用Retrofit 2從服務器獲取JSON。無盡的recyclerview android with retrofit 2
這是適配器。
public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {
private ArrayList<Rec> recs;
public DataAdapter(ArrayList<Rec> recs) {
this.recs = recs;
}
@Override
public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final DataAdapter.ViewHolder viewHolder,final int i) {
String decode ="^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
viewHolder.tv_link.setText(recs.get(i).getLink());
viewHolder.imageText.setText(recs.get(i).getImage());
Bitmap bmimage = null;
if(recs.get(i).getImage().toString().matches(decode)) {
byte[] imageByteArray = decodeImage(recs.get(i).getImage().toString());
bmimage = BitmapFactory.decodeByteArray(imageByteArray, 0,
imageByteArray.length);
viewHolder.image.setImageBitmap(bmimage);
}
else {
Picasso.with(viewHolder.imageText.getContext()).load(recs.get(i).getImage()).fit().centerInside() .into(viewHolder.image);
}
}
@Override
public int getItemCount() {
return recs.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView tv_id,tv_title,tv_link,imageText,body;
private ImageView image;
public ViewHolder(View view) {
super(view);
tv_link = (TextView)view.findViewById(R.id.tv_link);
imageText = (TextView)view.findViewById(R.id.imageText);
image = (ImageView)view.findViewById(R.id.image);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(), PromotionDetails.class);
intent.putExtra("link", tv_link.getText().toString());
view.getContext().startActivity(intent);
}
});
}
}
}
而下面是我的活動課，
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<Rec> data;
private DataAdapter adapter;
private Button BtnHistory,BtnBiller,BtnPromo;
private static final long CACHE_SIZE = 10 * 1024 * 1024;
float x1,x2;
float y1, y2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
BtnHistory.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Context context = getApplicationContext();
CharSequence text = "Please Login!!!";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
});
BtnBiller.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
BtnBiller.setBackgroundResource(R.drawable.btn_find_selected);
BtnPromo.setBackgroundResource(R.drawable.btn_promotion);
Intent i = new Intent(getApplicationContext(),
BillerCodeActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
}
});
BtnPromo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
BtnPromo.setBackgroundResource(R.drawable.btn_promotion_selected);
Intent i = new Intent(getApplicationContext(),
MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
}
});
}
private void initViews(){
BtnHistory =(Button) findViewById(R.id.btn_history);
BtnBiller =(Button) findViewById(R.id.btn_biller);
BtnPromo =(Button) findViewById(R.id.btn_promo);
recyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
getPromotions(0,3);
}
private void getPromotions(int a,int b){
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(30, TimeUnit.SECONDS)
.readTimeout(30, TimeUnit.SECONDS)
.writeTimeout(30, TimeUnit.SECONDS)
.cache(new Cache(getApplication().getCacheDir(), CACHE_SIZE))
.addNetworkInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
.build();
final ProgressDialog loading = ProgressDialog.show(this,"Fetching Data","Please wait...",false,false);
/** Runnable progressRunnable = new Runnable() {
@Override
public void run() {
loading.cancel();
}
};
Handler pdCanceller = new Handler();
pdCanceller.postDelayed(progressRunnable, 10000);*/
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://jpmockapi.azurewebsites.net/")
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build();
//Log.d(String.valueOf(client),String.valueOf(client));
RequestInterface request = retrofit.create(RequestInterface.class);
Call<JsonResponse> call = request.getPromotions(a,b);
call.enqueue(new Callback<JsonResponse>() {
@Override
public void onResponse(Call<JsonResponse> call, Response<JsonResponse> response) {
if(response.isSuccess()) {
loading.dismiss();
JsonResponse jsonResponse = response.body();
data = new ArrayList<>(Arrays.asList(jsonResponse.getPromotion()));
adapter = new DataAdapter(data);
recyclerView.setAdapter(adapter);
//DBCreate();
//SubmitDataToSQLiteDB();
}
else{
loading.dismiss();
Context context = getApplicationContext();
CharSequence text = "Having Problem On Fetching Data!!! Try Again...";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
@Override
public void onFailure(Call<JsonResponse> call, Throwable t) {
loading.dismiss();
Log.d("Error",t.getMessage());
/**Context context = getApplicationContext();
CharSequence text = "No Network Connection!!! Try Again...";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();*/
}
});
}
@Override
public void onStop(){
super.onStop();
}
@Override
public void onBackPressed() {
Intent i = new Intent(getApplicationContext(),
Start.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
}
}
這是我改造GET
public interface RequestInterface {
@GET("/cmsapi/promos/{startrowindex}/{maxcount}")
Call<JsonResponse>getPromotions(@Path("startrowindex") int a,
@Path("maxcount") int b);
}
我想要做的就是當像滾動瀏覽器那樣瀏覽recycleview時獲取JSON。希望有人會幫助我。謝謝。 `
試試這個工作https://codentrick.com/load-more-recyclerview-bottom-progressbar/ –