Three Level Exapandable ListView In Android with Two level Indicators

Java:

package zaihuishou.com.expandablerecyclerview;

import android.content.Context;

import android.os.Build;

import android.os.Bundle;

import android.support.annotation.RequiresApi;

import android.support.v7.app.AppCompatActivity;

import android.util.DisplayMetrics;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.ImageView;

import android.widget.TextView;

import java.util.List;

import zaihuishou.com.expandablerecyclerview.loader.listener.ServiceResponseListener;

import zaihuishou.com.expandablerecyclerview.loader.manager.ServiceManager;

import zaihuishou.com.expandablerecyclerview.navcategory.FirstLevelCategory;

import zaihuishou.com.expandablerecyclerview.navcategory.NavigationGategoryBaseResponse;

import zaihuishou.com.expandablerecyclerview.navcategory.SecondLevelCategory;

public class TestActivity extends AppCompatActivity {

    private ExpandableListView expandableListView;

    private Context context;

    @Override    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_test);

        context = this;

        expandableListView = (ExpandableListView) findViewById(R.id.mainList);

        DisplayMetrics metrics = new DisplayMetrics();

        getWindowManager().getDefaultDisplay().getMetrics(metrics);

        int width = metrics.widthPixels;

        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {

            expandableListView.setIndicatorBounds(width - GetPixelFromDips(50), width - GetPixelFromDips(10));

        } else {

            expandableListView.setIndicatorBoundsRelative(width - GetPixelFromDips(50), width - GetPixelFromDips(10));

        }

        addNavigationList();

    }

    public int GetPixelFromDips(float pixels) {

        // Get the screen's density scale        final float scale = getResources().getDisplayMetrics().density;

        // Convert the dps to pixels, based on density scale        return (int) ((scale * pixels + 0.5f) - 5);

    }

    public void addNavigationList() {

        ServiceManager.navigationList(getApplicationContext(), new ServiceResponseListener<NavigationGategoryBaseResponse>() {

                    @Override                    public void onSuccess(NavigationGategoryBaseResponse response) {

                        expandableListView.setAdapter(new TestActivity.ParentLevel(context, response.getMainCategories()));

                    }

                    @Override                    public void onFailure(Throwable throwable, String errorResponse) {

                    }

                }

        );

    }

    public class ParentLevel extends BaseExpandableListAdapter {

        private Context context;

        private List<FirstLevelCategory> firstLevelCategories;

        public ParentLevel(Context context, List<FirstLevelCategory> firstLevelCategoryList) {

            this.context = context;

            this.firstLevelCategories = firstLevelCategoryList;

        }

        @Override        public Object getChild(int arg0, int arg1) {

            return arg1;

        }

        @Override        public long getChildId(int groupPosition, int childPosition) {

            return childPosition;

        }

        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)

        @Override        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

            TestActivity.SecondLevelExpandableListView secondLevelELV = new TestActivity.SecondLevelExpandableListView(TestActivity.this);

            secondLevelELV.setAdapter(new TestActivity.SecondLevelAdapter(context, firstLevelCategories.get(groupPosition).getSubGrouphs().get(childPosition)));

            secondLevelELV.setGroupIndicator(getResources().getDrawable(R.drawable.settings_selector));

            DisplayMetrics metrics = new DisplayMetrics();

            getWindowManager().getDefaultDisplay().getMetrics(metrics);

            int width = metrics.widthPixels;

            if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {

                secondLevelELV.setIndicatorBounds(width - GetPixelFromDips(50), width - GetPixelFromDips(10));

            } else {

                secondLevelELV.setIndicatorBoundsRelative(width - GetPixelFromDips(50), width - GetPixelFromDips(10));

            }

            return secondLevelELV;

        }

        @Override        public int getChildrenCount(int groupPosition) {

            return firstLevelCategories.get(groupPosition).getSubGrouphs().size();

        }

        @Override        public Object getGroup(int groupPosition) {

            return groupPosition;

        }

        @Override        public int getGroupCount() {

            return firstLevelCategories.size();

        }

        @Override        public long getGroupId(int groupPosition) {

            return groupPosition;

        }

        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)

        @Override        public View getGroupView(int groupPosition, final boolean isExpanded, View convertView, ViewGroup parent) {

            if (convertView == null) {

                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

                convertView = inflater.inflate(R.layout.row_first, null);

                TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);

                final ImageView icon = (ImageView) convertView.findViewById(R.id.icon);

                String name = firstLevelCategories.get(groupPosition).getCategoryname();

                if (name.equals(context.getString(R.string.Fancy))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.fancy));

                } else if (name.equals(context.getString(R.string.Women))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.women));

                } else if (name.equals(context.getString(R.string.Office))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.stationary));

                } else if (name.equals(context.getString(R.string.BooksMore))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.books));

                } else if (name.equals(context.getString(R.string.Men))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.businessman));

                } else if (name.equals(context.getString(R.string.DailyNeeds))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.calendar));

                } else if (name.equals(context.getString(R.string.Garments))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.garments));

                } else if (name.equals(context.getString(R.string.BabyKids))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.babykids));

                } else if (name.equals(context.getString(R.string.Fashion))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.fasion));

                } else if (name.equals(context.getString(R.string.Electronics))) {

                    icon.setBackground(context.getResources().getDrawable(R.drawable.elctronics));

                }

                text.setText(name);

            }

            return convertView;

        }

        @Override        public boolean hasStableIds() {

            return true;

        }

        @Override        public boolean isChildSelectable(int groupPosition, int childPosition) {

            return true;

        }

    }

    public class SecondLevelExpandableListView extends ExpandableListView {

        public SecondLevelExpandableListView(Context context) {

            super(context);

        }

        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

            heightMeasureSpec = MeasureSpec.makeMeasureSpec(999999, MeasureSpec.AT_MOST);

            super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        }

    }

    public class SecondLevelAdapter extends BaseExpandableListAdapter {

        private Context context;

        private SecondLevelCategory secondLevelCategories;

        public SecondLevelAdapter(Context context, SecondLevelCategory secondLevelCategories) {

            this.context = context;

            this.secondLevelCategories = secondLevelCategories;

        }

        @Override        public Object getGroup(int groupPosition) {

            return groupPosition;

        }

        @Override        public int getGroupCount() {

            return 1;

        }

        @Override        public long getGroupId(int groupPosition) {

            return groupPosition;

        }

        @Override        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

            if (convertView == null) {

                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

                convertView = inflater.inflate(R.layout.row_third, null);

                TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);

                text.setText(secondLevelCategories.getSubcategoryname());

            }

            return convertView;

        }

        @Override        public Object getChild(int groupPosition, int childPosition) {

            return childPosition;

        }

        @Override        public long getChildId(int groupPosition, int childPosition) {

            return childPosition;

        }

        @Override        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

            if (convertView == null) {

                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

                convertView = inflater.inflate(R.layout.row_second, null);

                TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);

                text.setText(secondLevelCategories.getThirdLevelCategoryList().get(childPosition).getLowersubcategoryname());

            }

            return convertView;

        }

        @Override        public int getChildrenCount(int groupPosition) {

            return secondLevelCategories.getThirdLevelCategoryList().size();

        }

        @Override        public boolean hasStableIds() {

            return true;

        }

        @Override        public boolean isChildSelectable(int groupPosition, int childPosition) {

            return true;

        }

    }

}

main.Xml:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/activity_test"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="zaihuishou.com.expandablerecyclerview.TestActivity"><ExpandableListViewandroid:id="@+id/mainList"android:layout_width="match_parent"android:layout_height="match_parent"android:background="#ffffff"android:groupIndicator="@drawable/settings_selector"android:transcriptMode="alwaysScroll"></ExpandableListView></RelativeLayout>

rowfirst.xml:

<?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="100dp"android:orientation="horizontal"android:padding="10dp"><ImageViewandroid:id="@+id/icon"android:layout_width="25dp"android:layout_height="25dp"android:layout_alignParentLeft="true" /><TextViewandroid:id="@+id/eventsListEventRowText"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_toLeftOf="@+id/plus"android:layout_toRightOf="@+id/icon"android:textColor="@android:color/background_dark"android:textSize="15sp" /></LinearLayout>

rowsecond.xml:

<?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="match_parent"android:orientation="vertical"android:padding="10dp"><TextViewandroid:id="@+id/eventsListEventRowText"android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingLeft="20dp" /></LinearLayout>

rowthird.xml:

<?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="match_parent"android:orientation="vertical"android:padding="10dp"><TextViewandroid:id="@+id/eventsListEventRowText"android:layout_width="match_parent"android:layout_height="wrap_content" /></LinearLayout>