android fast scroll recycler view

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    defaultConfig {
+        applicationId "fastscroll.app.alphabetindex"
+        minSdkVersion 15
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.android.support:appcompat-v7:26.1.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
+    implementation 'com.android.support:design:26.1.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.1'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
+    implementation project(':fastscrollalphabetindex')
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/fastscroll/app/alphabetindex/ExampleInstrumentedTest.java

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+package fastscroll.app.alphabetindex;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("fastscroll.app.alphabetindex", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="fastscroll.app.alphabetindex">
+
+    <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"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/fastscroll/app/alphabetindex/Data.java

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+package fastscroll.app.alphabetindex;
+
+import android.support.annotation.NonNull;
+
+import java.util.Comparator;
+
+/**
+ * Created by frantic on 2/2/18.
+ */
+
+public class Data implements  Comparable<Data>{
+    int id;
+    String title;
+
+    public Data() {
+    }
+
+    public Data(String title) {
+        this.title = title;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    @Override
+    public int compareTo(@NonNull Data data) {
+        String compareQuantity = ((Data) data).getTitle();
+
+        //ascending order
+        return this.title.compareTo(data.getTitle());
+    }
+
+    public static Comparator<Data> titleNameComparator = new Comparator<Data>() {
+
+        public int compare(Data data1, Data data2) {
+
+            String d1 = data1.getTitle().toUpperCase();
+            String d2 = data2.getTitle().toUpperCase();
+
+            //ascending order
+            return d1.compareTo(d2);
+
+            //descending order
+            //return fruitName2.compareTo(fruitName1);
+        }
+
+    };
+}

app/src/main/java/fastscroll/app/alphabetindex/DataAdapter.java

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+package fastscroll.app.alphabetindex;
+
+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.SectionIndexer;
+import android.widget.TextView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by frantic on 2/2/18.
+ */
+
+public class DataAdapter extends RecyclerView.Adapter<DataAdapter.MyHolder> implements SectionIndexer,Comparable{
+    List<Data> dataList;
+    private ArrayList<Integer> mSectionPositions;
+
+    public DataAdapter(List<Data> dataList) {
+        this.dataList = dataList;
+    }
+
+    @Override
+    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item,null);
+        return new MyHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(MyHolder holder, int position) {
+        Data data = dataList.get(position);
+        holder.title.setText(data.getTitle());
+
+    }
+
+    @Override
+    public int getItemCount() {
+        return dataList.size();
+    }
+
+    @Override
+    public Object[] getSections() {
+        List<String> sections = new ArrayList<>();
+        mSectionPositions = new ArrayList<>();
+        for (int i = 0, size = dataList.size(); i < size; i++) {
+            String section = String.valueOf(dataList.get(i).getTitle().charAt(0)).toUpperCase();
+            if (!sections.contains(section)) {
+                sections.add(section);
+                mSectionPositions.add(i);
+            }
+        }
+        return sections.toArray(new String[0]);
+    }
+
+    @Override
+    public int getPositionForSection(int i) {
+        return mSectionPositions.get(i);    }
+
+    @Override
+    public int getSectionForPosition(int i) {
+        return 0;
+    }
+
+    @Override
+    public int compareTo(@NonNull Object o) {
+        return 0;
+    }
+
+    public class MyHolder extends RecyclerView.ViewHolder {
+        TextView title;
+        public MyHolder(View itemView) {
+            super(itemView);
+            title = itemView.findViewById(R.id.title);
+        }
+    }
+}