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android recyclerview with listadapter
android recyclerview with listadapter
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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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> `app` written in Java
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> `app-kotlin` is the same as `app` but written in Kotlin
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- `app` written in Java
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- `app-kotlin` is the same as `app` but written in Kotlin
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![android-recyclerview-app-layout](http://hmkcode.github.io/images/android/android-recyclerview-app_layout.png)
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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)
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![android-recyclerview-app-files](http://hmkcode.github.io/images/android/android-recyclerview-app-files.png)
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Android | RecyclerView Using Support Library ListAdapter
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========================================================
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- `app-listadapter` building recyclerview with `ListAdapter`
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![android-recyclerview-listadapter](http://hmkcode.github.io/images/android/android-recyclerview-listadapter.gif)
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<code>ListAdapter</code> for <code>RecyclerView</code> has been introduced in <a href="https://developer.android.com/topic/libraries/support-library/revisions.html#27-1-0">Revision 27.1.0 Release of Support Library</a>. <code>ListAdapter</code> uses <code>DiffUtil</code> under the hood to compute list diffs on a background thread. This will help <code>RecyclerView</code> animate changes automatically with less work on the UI thread.

‎android-recyclerview/app-listadapter/build.gradle

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apply plugin: 'com.android.application'
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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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compileOptions {
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targetCompatibility 1.8
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sourceCompatibility 1.8
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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 'com.android.support:appcompat-v7:27.1.1'
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implementation 'com.android.support.constraint:constraint-layout:1.1.3'
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testImplementation 'junit:junit:4.12'
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implementation 'com.android.support:recyclerview-v7:27.1.1'
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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/app-listadapter/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">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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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>

‎android-recyclerview/app-listadapter/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.recyclerview.extensions.ListAdapter;
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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.MyListAdapter;
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import com.hmkcode.models.Link;
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import com.hmkcode.utils.LinkDiffCallback;
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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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private List<Link> links;
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private ListAdapter listAdapter;
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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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recyclerView.setClickable(true);
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// list adapter
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links = getListData();
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listAdapter = new MyListAdapter(new LinkDiffCallback(),
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link -> updateList(link));
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recyclerView.setAdapter(listAdapter);
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listAdapter.submitList(getListData());
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}
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private void updateList(Link link){
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boolean removed = links.remove(link);
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listAdapter.submitList(new LinkedList(links));
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}
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//generate a list of Link
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private 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-listadapter/src/main/java/com/hmkcode/adapters/MyListAdapter.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.recyclerview.extensions.ListAdapter;
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import android.support.v7.util.DiffUtil;
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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.listeners.MyItemClickListener;
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import com.hmkcode.models.Link;
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public class MyListAdapter extends ListAdapter<Link, MyListAdapter.MyViewHolder> {
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MyItemClickListener myItemClickListener;
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public MyListAdapter(@NonNull DiffUtil.ItemCallback diffCallback,
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MyItemClickListener myItemClickListener) {
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super(diffCallback);
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this.myItemClickListener = myItemClickListener;
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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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View itemLayoutView = LayoutInflater.from(parent.getContext())
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.inflate(R.layout.item_layout, null);
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return new MyViewHolder(itemLayoutView);
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}
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@Override
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public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int position) {
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myViewHolder.bind(getItem(position));
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}
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// inner class
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public class MyViewHolder extends RecyclerView.ViewHolder {
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private View itemLayoutView;
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private TextView itemTitle;
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private TextView itemUrl;
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private ImageView itemIcon;
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public MyViewHolder(View itemLayoutView) {
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super(itemLayoutView);
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this.itemLayoutView = itemLayoutView;
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this.itemTitle = itemLayoutView.findViewById(R.id.item_title);
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this.itemUrl = itemLayoutView.findViewById(R.id.item_url);
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this.itemIcon = itemLayoutView.findViewById(R.id.item_icon);
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}
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public void bind(Link link){
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this.itemIcon.setImageResource(link.getIcon());
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this.itemTitle.setText(link.getTitle());
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this.itemUrl.setText(link.getUrl());
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this.itemLayoutView.setOnClickListener(
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v -> myItemClickListener.onClick(link));
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}
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}
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}

‎android-recyclerview/app-listadapter/src/main/java/com/hmkcode/listeners/MyItemClickListener.java

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package com.hmkcode.listeners;
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import com.hmkcode.models.Link;
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@FunctionalInterface
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public interface MyItemClickListener {
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public void onClick(Link link);
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}

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

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package com.hmkcode.models;
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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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@Override
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public boolean equals(Object obj) {
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return this.getUrl().equals(((Link)obj).getUrl());
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}
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@Override
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public String toString() {
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return "Link{" +
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"icon=" + icon +
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", title='" + title + '\'' +
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", url='" + url + '\'' +
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'}';
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}
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}

‎android-recyclerview/app-listadapter/src/main/java/com/hmkcode/utils/LinkDiffCallback.java

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package com.hmkcode.utils;
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import android.support.v7.util.DiffUtil;
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import com.hmkcode.models.Link;
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public class LinkDiffCallback extends DiffUtil.ItemCallback<Link> {
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@Override
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public boolean areItemsTheSame(Link oldItem, Link newItem) {
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return oldItem.getUrl().equals(newItem.getUrl());
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}
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@Override
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public boolean areContentsTheSame(Link oldItem, Link newItem) {
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return oldItem.getUrl().equals(newItem.getUrl());
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}
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}

‎android-recyclerview/app-listadapter/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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