132 views.This new widget is a big step for displaying data in Material Design because the ListView and GridView are one of the most commonly used UI widgets. In RecyclerView android provides a lot of new features which are not present in existing ListView or GridView.
Important Note:
In Android, RecyclerView provides an ability to implement the horizontal, vertical and Expandable List. It is mainly used when we have data collections whose elements can change at runtime based on user action or any network events. For using this widget we have to specify the Adapter and Layout Manager.
Webservice:
URL:
http://androindian.com/apps/my_apps/api.php
Req: {“action”:”get_all_apps”}
Response:
{
“response”: “success”,
“results”: 11,
“data”: [
{
“id”: “1”,
“app_name”: “Best Wishes”,
“pic”: “http://androindian.com/app_images/best-wishes.png”,
“url”: “https://play.google.com/store/apps/details?id=androiindians.messages”
},
}
This Recycler using retrofit
Pleae add below gradle in project
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implementation 'com.android.support:recyclerview-v7:27.1.1' implementation 'com.squareup.retrofit2:converter-gson:2.4.0' implementation 'com.squareup.retrofit2:retrofit:2.4.0' implementation 'com.google.code.gson:gson:2.8.2' implementation 'com.squareup.picasso:picasso:2.71828' |
activitymain.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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=".MainActivity" android:orientation="vertical"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:scrollbars="vertical" android:layout_width="match_parent" android:layout_height="wrap_content"/> </LinearLayout> |
MainActivity.Java
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package com.androindian.raj.recyclerview; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.widget.Toast; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.List; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; import retrofit2.Retrofit; import retrofit2.converter.gson.GsonConverterFactory; public class MainActivity extends AppCompatActivity { private RecyclerView recyclerView; List<String> apps=new ArrayList<String>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); recyclerView = (RecyclerView) findViewById(R.id.recycler_view); Retrofit retrofit=new Retrofit.Builder() .baseUrl("http://androindian.com/apps/my_apps/") .addConverterFactory(GsonConverterFactory.create()) .build(); Appslist registerUser=retrofit.create(Appslist.class); JSONObject jsonObject=new JSONObject(); try { jsonObject.put("action","get_all_apps"); } catch (JSONException e) { e.printStackTrace(); } JsonObject object=new JsonParser().parse(jsonObject.toString()).getAsJsonObject(); Call<UserResponse> userResponseCall=registerUser.listofapps(object); userResponseCall.enqueue(new Callback<UserResponse>() { @Override public void onResponse(Call<UserResponse> call, Response<UserResponse> response) { LinearLayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false); recyclerView.setLayoutManager(mLayoutManager); CustomAdapter customAdapter = new CustomAdapter(MainActivity.this, response.body().getData()); recyclerView.setAdapter(customAdapter); // set the Adapter to RecyclerView } @Override public void onFailure(Call<UserResponse> call, Throwable t) { Toast.makeText(MainActivity.this, ""+t, Toast.LENGTH_SHORT).show(); } }); } } |
Create an interface Appslist.java
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package com.androindian.raj.recyclerview; import com.google.gson.JsonObject; import retrofit2.Call; import retrofit2.http.Body; import retrofit2.http.Headers; import retrofit2.http.POST; public interface Appslist { @Headers("Content-Type:application/json") @POST("api.php") Call<UserResponse> listofapps(@Body JsonObject jsonObject); } |
Then Create one more class for object response on name of UserResponse.class
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package com.androindian.raj.recyclerview; import com.google.gson.annotations.Expose; import com.google.gson.annotations.SerializedName; import java.util.List; public class UserResponse { @SerializedName("response") @Expose private String response; @SerializedName("results") @Expose private Integer results; @SerializedName("data") @Expose private List<Datum> data = null; public String getResponse() { return response; } public void setResponse(String response) { this.response = response; } public Integer getResults() { return results; } public void setResults(Integer results) { this.results = results; } public List<Datum> getData() { return data; } public void setData(List<Datum> data) { this.data = data; } } |
Then for array response need one more create class on name Datum.java
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package com.androindian.raj.recyclerview; import com.google.gson.annotations.Expose; import com.google.gson.annotations.SerializedName; public class Datum { @SerializedName("id") @Expose private String id; @SerializedName("app_name") @Expose private String appName; @SerializedName("pic") @Expose private String pic; @SerializedName("url") @Expose private String url; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getAppName() { return appName; } public void setAppName(String appName) { this.appName = appName; } public String getPic() { return pic; } public void setPic(String pic) { this.pic = pic; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } } |
then Create Custom Adapter for Recyclerview
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package com.androindian.raj.recyclerview; import android.content.Context; import android.support.annotation.NonNull; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.squareup.picasso.Picasso; import java.util.List; public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> { List<Datum> Data; Context context; public CustomAdapter(MainActivity mainActivity, List<Datum> data) { context=mainActivity; Data=data; } @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.rowlayout, parent, false); return new MyViewHolder(view); } @Override public void onBindViewHolder(@NonNull MyViewHolder holder, final int position) { holder.textView.setText(Data.get(position).getAppName()); Picasso.get().load(Data.get(position).getPic()).into(holder.imageView); holder.imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(context, ""+position, Toast.LENGTH_SHORT).show(); } }); } @Override public int getItemCount() { return Data.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { TextView textView; ImageView imageView; public MyViewHolder(View itemView) { super(itemView); textView=itemView.findViewById(R.id.tv); imageView=itemView.findViewById(R.id.iv); } } } |
then create one more xml file for view on name of rowlayout.xml
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<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/iv"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv"/> </LinearLayout> |
Finally add Internet permission in manifest file
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<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.androindian.raj.recyclerview"> <uses-permission android:name="android.permission.INTERNET"></uses-permission> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> |
OutPut
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