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recyclerview upadated
recyclerview upadated
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‎android-recyclerview/README.md

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Android | Create a List with RecyclerView
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=========================================
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![android-recyclerview-app-layout]("http://hmkcode.github.io/images/android/android-recyclerview-app_layout.png" )
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Creating a scrollable list of elements is a common pattern in mobile application. Using RecyclerView we can list a large data sets or frequently changing one. `RecyclerView` is an advanced and flexible version of ListView, addressing serveral issues with existing listing views. Here we will build a simple application with `RecyclerView`
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## Overview
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We will build a simple app that lists a hard-coded `Link` in a `RecyclerView`. To display items on `RecyclerView` you need to have the following components:
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- `RecyclerView` widget added to the activity layout.
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- A class extending `RecyclerView.Adapter`.
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- A class extending `RecyclerView.ViewHolder`.
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- Layout for RecyclerView items.
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Files we need for this app are shown in the image below.
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![android-recyclerview-app-files]({{ "http://hmkcode.github.io/images/android/android-recyclerview-app-files.png" | absolute_url }})

‎android-recyclerview/app/build.gradle

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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply plugin: 'kotlin-android-extensions'
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android {
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compileSdkVersion 27
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defaultConfig {
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applicationId "com.hmkcode"
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minSdkVersion 19
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targetSdkVersion 27
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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implementation fileTree(dir: 'libs', include: ['*.jar'])
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implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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implementation 'com.android.support:appcompat-v7:27.1.1'
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implementation 'com.android.support.constraint:constraint-layout:1.1.2'
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implementation 'com.android.support:recyclerview-v7:27.1.1'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'com.android.support.test:runner:1.0.2'
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androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
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}

‎android-recyclerview/AndroidManifest.xml renamed to ‎android-recyclerview/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.hmkcode.android.recyclerview"
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android:versionCode="1"
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android:versionName="1.0" >
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<uses-sdk
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android:minSdkVersion="8"
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android:targetSdkVersion="21" />
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package="com.hmkcode">
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<application
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android:allowBackup="true"
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android:icon="@drawable/ic_launcher"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:theme="@style/AppTheme" >
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<activity
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android:name=".MainActivity"
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android:label="@string/app_name" >
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".activities.MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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</manifest>

‎android-recyclerview/app/src/main/java/com/hmkcode/activities/MainActivity.java

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package com.hmkcode.activities;
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import android.support.v7.app.AppCompatActivity;
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import android.os.Bundle;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import com.hmkcode.R;
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import com.hmkcode.adapters.MyAdapter;
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import com.hmkcode.model.Link;
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import java.util.LinkedList;
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import java.util.List;
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public class MainActivity extends AppCompatActivity {
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private RecyclerView recyclerView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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recyclerView = findViewById(R.id.recyclerView);
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// layout manager
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RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
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recyclerView.setLayoutManager(layoutManager);
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// adapter
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RecyclerView.Adapter adapter = new MyAdapter(getListData());
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recyclerView.setAdapter(adapter);
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}
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//generate a list of Link
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private static List<Link> getListData(){
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List<Link> links = new LinkedList<Link>();
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Link link = new Link();
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link.setIcon(R.drawable.ic_link);
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link.setTitle("HMKCODE BLOG");
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link.setUrl("hmkcode.com");
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links.add(link);
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link = new Link();
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link.setIcon(R.drawable.ic_twitter);
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link.setTitle("@HMKCODE");
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link.setUrl("twitter.com/hmkcode");
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links.add(link);
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link = new Link();
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link.setIcon(R.drawable.ic_github);
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link.setTitle("HMKCODE");
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link.setUrl("github.com/hmkcode");
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links.add(link);
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return links;
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}
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}

‎android-recyclerview/app/src/main/java/com/hmkcode/adapters/MyAdapter.java

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package com.hmkcode.adapters;
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import android.support.annotation.NonNull;
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import android.support.v7.widget.RecyclerView;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import android.widget.TextView;
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import com.hmkcode.R;
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import com.hmkcode.model.Link;
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import java.util.List;
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public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
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private List<Link> links;
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// constructor
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public MyAdapter(List<Link> links){
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this.links = links;
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}
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@NonNull
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@Override
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public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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// inflate item_layout
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View itemLayoutView = LayoutInflater.from(parent.getContext())
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.inflate(R.layout.item_layout, null);
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MyViewHolder vh = new MyViewHolder(itemLayoutView);
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return vh;
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}
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@Override
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public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
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holder.itemIcon.setImageResource(links.get(position).getIcon());
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holder.itemTitle.setText(links.get(position).getTitle());
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holder.itemUrl.setText(links.get(position).getUrl());
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}
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@Override
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public int getItemCount() {
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if(links != null)
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return links.size();
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else
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return 0;
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}
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// inner static class
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public static class MyViewHolder extends RecyclerView.ViewHolder {
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public TextView itemTitle;
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public TextView itemUrl;
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public ImageView itemIcon;
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public MyViewHolder(View itemLayoutView) {
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super(itemLayoutView);
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itemTitle = itemLayoutView.findViewById(R.id.item_title);
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itemUrl = itemLayoutView.findViewById(R.id.item_url);
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itemIcon = itemLayoutView.findViewById(R.id.item_icon);
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}
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}
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}

‎android-recyclerview/app/src/main/java/com/hmkcode/model/Link.java

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package com.hmkcode.model;
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public class Link {
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private int icon;
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private String title;
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private String url;
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public int getIcon() {
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return icon;
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}
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public void setIcon(int icon) {
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this.icon = icon;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public String getUrl() {
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return url;
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}
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public void setUrl(String url) {
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this.url = url;
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}
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}

‎android-recyclerview/app/src/main/res/drawable/ic_github.xml

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<vector android:height="24dp" android:viewportHeight="1024"
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android:viewportWidth="1024" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
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<path android:fillColor="#1B1F23" android:fillType="evenOdd" android:pathData="M512,0C229.12,0 0,229.12 0,512C0,738.56 146.56,929.92 350.08,997.76C375.68,1002.24 385.28,986.88 385.28,973.44C385.28,961.28 384.64,920.96 384.64,878.08C256,901.76 222.72,846.72 212.48,817.92C206.72,803.2 181.76,757.76 160,745.6C142.08,736 116.48,712.32 159.36,711.68C199.68,711.04 228.48,748.8 238.08,764.16C284.16,841.6 357.76,819.84 387.2,806.4C391.68,773.12 405.12,750.72 419.84,737.92C305.92,725.12 186.88,680.96 186.88,485.12C186.88,429.44 206.72,383.36 239.36,347.52C234.24,334.72 216.32,282.24 244.48,211.84C244.48,211.84 287.36,198.4 385.28,264.32C426.24,252.8 469.76,247.04 513.28,247.04C556.8,247.04 600.32,252.8 641.28,264.32C739.2,197.76 782.08,211.84 782.08,211.84C810.24,282.24 792.32,334.72 787.2,347.52C819.84,383.36 839.68,428.8 839.68,485.12C839.68,681.6 720,725.12 606.08,737.92C624.64,753.92 640.64,784.64 640.64,832.64C640.64,901.12 640,956.16 640,973.44C640,986.88 649.6,1002.88 675.2,997.76C877.44,929.92 1024,737.92 1024,512C1024,229.12 794.88,0 512,0Z"/>
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</vector>

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