How to Sort Array Map in Android Studio Java | Sort List by Name or Numbers
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Hello Developers,
In this blog I will discuss with you how to sort an Array Map in java. You can use this method in Android Studio for sorting your ListView or RecyclerView. So without wasting your time lets Start.
You can Download this Demo Project from Project Store
SortListMap
public static void sortListMap(final ArrayList<HashMap<String, Object>> listMap, final String key, final boolean isNumber, final boolean ascending) {
Collections.sort(listMap, new Comparator<HashMap<String, Object>>() {
public int compare(HashMap<String, Object> _compareMap1, HashMap<String, Object> _compareMap2) {
if (isNumber) {
try {
int _count1 = Integer.parseInt(_compareMap1.get(key).toString());
int _count2 = Integer.parseInt(_compareMap2.get(key).toString());
if (ascending) {
return _count1 < _count2 ? -1 : _count1 < _count2 ? 1 : 0;
} else {
return _count1 > _count2 ? -1 : _count1 > _count2 ? 1 : 0;
}
} catch (NumberFormatException e) {
if (ascending) {
return (_compareMap1.get(key).toString()).compareTo(_compareMap2.get(key).toString());
} else {
return (_compareMap2.get(key).toString()).compareTo(_compareMap1.get(key).toString());
}
}
} else {
if (ascending) {
return (_compareMap1.get(key).toString()).compareTo(_compareMap2.get(key).toString());
} else {
return (_compareMap2.get(key).toString()).compareTo(_compareMap1.get(key).toString());
}
}
}
});
}Now, Show the uses of this method
Sort Array Map
boolean isNumber = true;
boolean isAscending = true;
sortListMap(listMap, "your_key",isNumber, isAscending);Now, You can see an Example of Sort Array Map and use it in ListView or GridView or RecyclerView. First, Create an Activity in your Project.
MainActivity.Java
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.annotation.SuppressLint;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
ArrayList<HashMap<String, Object>> listMap = new ArrayList<>();
Button sort_by_name, sort_by_number;
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sort_by_name = findViewById(R.id.sort_by_name);
sort_by_number = findViewById(R.id.sort_by_number);
recyclerView = findViewById(R.id.recyclerview1);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
loadMap();
sort_by_number.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sortListMap(listMap, "Number", true, true);
recyclerView.setAdapter(new Recyclerview1Adapter(listMap));
}
});
sort_by_name.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sortListMap(listMap, "Name", false, true);
recyclerView.setAdapter(new Recyclerview1Adapter(listMap));
}
});
}
private void loadMap() {
HashMap<String, Object> map = new HashMap<>();
map.put("Name", "Anika");
map.put("Number", "5");
listMap.add(map);
HashMap<String, Object> map2 = new HashMap<>();
map2.put("Name", "Rahul");
map2.put("Number", "3");
listMap.add(map2);
HashMap<String, Object> map3 = new HashMap<>();
map3.put("Name", "Salman");
map3.put("Number", "2");
listMap.add(map3);
HashMap<String, Object> map4 = new HashMap<>();
map4.put("Name", "Aman");
map4.put("Number", "4");
listMap.add(map4);
HashMap<String, Object> map5 = new HashMap<>();
map5.put("Name", "Karan");
map5.put("Number", "1");
listMap.add(map5);
recyclerView.setAdapter(new Recyclerview1Adapter(listMap));
}
public static void sortListMap(final ArrayList<HashMap<String, Object>> listMap, final String key, final boolean isNumber, final boolean ascending) {
Collections.sort(listMap, new Comparator<HashMap<String, Object>>() {
public int compare(HashMap<String, Object> _compareMap1, HashMap<String, Object> _compareMap2) {
if (isNumber) {
try {
int _count1 = Integer.parseInt(_compareMap1.get(key).toString());
int _count2 = Integer.parseInt(_compareMap2.get(key).toString());
if (ascending) {
return _count1 < _count2 ? -1 : _count1 < _count2 ? 1 : 0;
} else {
return _count1 > _count2 ? -1 : _count1 > _count2 ? 1 : 0;
}
} catch (NumberFormatException e) {
if (ascending) {
return (_compareMap1.get(key).toString()).compareTo(_compareMap2.get(key).toString());
} else {
return (_compareMap2.get(key).toString()).compareTo(_compareMap1.get(key).toString());
}
}
} else {
if (ascending) {
return (_compareMap1.get(key).toString()).compareTo(_compareMap2.get(key).toString());
} else {
return (_compareMap2.get(key).toString()).compareTo(_compareMap1.get(key).toString());
}
}
}
});
}
public class Recyclerview1Adapter extends RecyclerView.Adapter<MainActivity.Recyclerview1Adapter.ViewHolder> {
ArrayList<HashMap<String, Object>> _data;
public Recyclerview1Adapter(ArrayList<HashMap<String, Object>> _arr) {
_data = _arr;
}
@Override
public MainActivity.Recyclerview1Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater _inflater = (LayoutInflater) getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View _v = _inflater.inflate(R.layout.list_adapter, null);
RecyclerView.LayoutParams _lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
_v.setLayoutParams(_lp);
return new MainActivity.Recyclerview1Adapter.ViewHolder(_v);
}
@SuppressLint("SetTextI18n")
@Override
public void onBindViewHolder(MainActivity.Recyclerview1Adapter.ViewHolder _holder, @SuppressLint("RecyclerView") final int _position) {
View _view = _holder.itemView;
TextView nameText = _view.findViewById(R.id.nameText);
TextView numberText = _view.findViewById(R.id.numberText);
nameText.setText("Name :".concat(_data.get(_position).get("Name").toString()));
numberText.setText("Number :".concat(_data.get(_position).get("Number").toString()));
}
@Override
public int getItemCount() {
return _data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View v) {
super(v);
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_margin="8dp"
android:orientation="vertical"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="wrap_content">
<Button
android:id="@+id/sort_by_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="4dp"
android:text="Sort_by_Name"/>
<Button
android:id="@+id/sort_by_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:text="Sort_by_Number"/>
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerview1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>Here is the Adapter Layout which is used for Recyclerview Adapter
list_adapter.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">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_margin="8dp"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_margin="8dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/nameText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name :"/>
<TextView
android:id="@+id/numberText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Number :"/>
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>If you want to Download this Project then You can Download this Demo Project from Project Store. Do not forget to visit our Youtube chennal for geting Amazing Android Projects.
Thank You
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