Initial commit

.gitignore

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

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.2.0-rc2'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

example/.gitignore

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+/build

example/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 24
+    buildToolsVersion "24.0.1"
+    defaultConfig {
+        applicationId "com.genius.groupie.example"
+        minSdkVersion 17
+        targetSdkVersion 24
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        vectorDrawables.useSupportLibrary true
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    dataBinding {
+        enabled = true
+    }
+}
+
+dependencies {
+    compile project(":groupie")
+    compile 'com.android.support:appcompat-v7:24.2.1'
+    compile 'com.android.support:design:24.2.1'
+    compile 'com.android.support:cardview-v7:24.2.1'
+}

example/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/lisawray/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# 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 *;
+#}

example/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="com.genius.groupie.example"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        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>
+        <activity
+            android:name=".SettingsActivity"
+            android:label="@string/title_activity_settings"
+            android:theme="@style/SettingsTheme">
+        </activity>
+    </application>
+
+</manifest>

example/src/main/java/com/genius/groupie/example/ColumnGroup.java

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+package com.genius.groupie.example;
+
+import com.genius.groupie.Group;
+import com.genius.groupie.Item;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A simple, non-editable, non-nested group of Items which displays a list as vertical columns.
+ */
+public class ColumnGroup implements Group {
+
+    private List<Item> items = new ArrayList<>();
+
+    public ColumnGroup(List<? extends Item> items) {
+        for (int i = 0; i < items.size(); i++) {
+            // Rearrange items so that the adapter appears to arrange them in vertical columns
+            int index;
+            if (i % 2 == 0) {
+                index = i / 2;
+            } else {
+                index = (i - 1) / 2 + (int) (items.size() / 2f);
+                // If columns are uneven, we'll put an extra one at the end of the first column,
+                // meaning the second column's indices will all be increased by 1
+                if (items.size() % 2 == 1) index++;
+            }
+            Item trackItem = items.get(index);
+            this.items.add(trackItem);
+        }
+    }
+
+    public void setGroupDataObserver(GroupDataObserver groupDataObserver) {
+        // no real need to do anything here
+    }
+
+    public Item getItem(int position) {
+        return items.get(position);
+    }
+
+    public int getPosition(Item item) {
+        return items.indexOf(item);
+    }
+
+    @Override public int getItemCount() {
+        return items.size();
+    }
+}

example/src/main/java/com/genius/groupie/example/ExpandableHeaderItem.java

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+package com.genius.groupie.example;
+
+import android.support.annotation.StringRes;
+import android.view.View;
+
+import com.genius.groupie.ExpandableGroup;
+import com.genius.groupie.ExpandableItem;
+import com.genius.groupie.example.databinding.ItemHeaderBinding;
+import com.genius.groupie.example.item.HeaderItem;
+
+public class ExpandableHeaderItem extends HeaderItem implements ExpandableItem {
+
+    private ExpandableGroup expandableGroup;
+
+    public ExpandableHeaderItem(@StringRes int titleStringResId, @StringRes int subtitleResId) {
+        super(titleStringResId, subtitleResId);
+    }
+
+    @Override public void bind(final ItemHeaderBinding viewBinding, int position) {
+        super.bind(viewBinding, position);
+        bindIcon(viewBinding);
+        viewBinding.icon.setOnClickListener(new View.OnClickListener() {
+            @Override public void onClick(View view) {
+                expandableGroup.onToggleExpanded();
+                bindIcon(viewBinding);
+            }
+        });
+    }
+
+    private void bindIcon(ItemHeaderBinding viewBinding) {
+        viewBinding.icon.setVisibility(View.VISIBLE);
+        viewBinding.icon.setImageResource(
+                expandableGroup.isExpanded() ? R.drawable.collapse : R.drawable.expand);
+    }
+
+    @Override public void setExpandableGroup(ExpandableGroup onToggleListener) {
+        this.expandableGroup = onToggleListener;
+    }
+}

example/src/main/java/com/genius/groupie/example/InfiniteScrollListener.java

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+package com.genius.groupie.example;
+
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+
+public abstract class InfiniteScrollListener extends RecyclerView.OnScrollListener {
+
+    private int previousTotal = 0; // The total number of items in the dataset after the last load
+    private boolean loading = true; // True if we are still waiting for the last set of data to load.
+    private final int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more.
+    private int firstVisibleItem, visibleItemCount, totalItemCount;
+    private int current_page = 0;
+    private LinearLayoutManager linearLayoutManager;
+
+    public InfiniteScrollListener(LinearLayoutManager linearLayoutManager) {
+        this.linearLayoutManager = linearLayoutManager;
+    }
+
+    public void setLinearLayoutManager(LinearLayoutManager linearLayoutManager) {
+        this.linearLayoutManager = linearLayoutManager;
+    }
+
+    @Override
+    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+        super.onScrolled(recyclerView, dx, dy);
+
+        visibleItemCount = recyclerView.getChildCount();
+        totalItemCount = linearLayoutManager.getItemCount();
+        firstVisibleItem = linearLayoutManager.findFirstVisibleItemPosition();
+
+        if (loading) {
+            if (totalItemCount > previousTotal || totalItemCount == 0) {
+                loading = false;
+                previousTotal = totalItemCount;
+            }
+        }
+
+        // End has been reached
+        if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
+            current_page++;
+            onLoadMore(current_page);
+            loading = true;
+        }
+    }
+
+    public abstract void onLoadMore(int current_page);
+}