Firebase Cloud Firestore Database Example in Android

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Hello Friends, today we are going to see Firebase Cloud Firestore database example in Android. Cloud Firestore is a NoSQL flexible, scalable database for mobile, web, and server development from Firebase and Google Cloud Platform. To use cloud firestore in our android project we first need to setup project and app on firebase console and download configuration file. Here I’ll not explain how to setup project, app and download configuration file as it is better explained on official website. We’ll see only coding and adding dependency part here and to setup project, app and downloading configuration file below link will help us.

https://firebase.google.com/docs/android/setup#console

So, here is the code

build.gradle (Project Level)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.1'
        classpath 'com.google.gms:google-services:4.3.3'//added
        

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

repositories {

google()

jcenter()

}

dependencies {

classpath 'com.android.tools.build:gradle:3.6.1'

classpath 'com.google.gms:google-services:4.3.3'//added

// NOTE: Do not place your application dependencies here; they belong

// in the individual module build.gradle files

}

allprojects {

repositories {

google()

jcenter()

}

task clean(type: Delete) {

delete rootProject.buildDir

}

build.gradle (Module Level)

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'//added

android {
    compileSdkVersion 28


    defaultConfig {
        applicationId "com.zatackcoder.firebasedatabaseexample"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        //to fix Cannot fit requested classes in a single dex file error
        multiDexEnabled true //added
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'com.google.firebase:firebase-auth:19.2.0' //added
    implementation 'com.google.firebase:firebase-firestore:21.4.1' //added
    implementation 'com.firebaseui:firebase-ui-firestore:4.1.0' //added
    implementation 'androidx.recyclerview:recyclerview:1.1.0' //added
    //Cannot fit requested classes in a single dex file
    implementation 'com.android.support:multidex:1.0.3' //added
}

apply plugin: 'com.android.application'

apply plugin: 'com.google.gms.google-services'//added

android {

compileSdkVersion 28

defaultConfig {

applicationId "com.zatackcoder.firebasedatabaseexample"

minSdkVersion 16

targetSdkVersion 28

versionCode 1

versionName "1.0"

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

//to fix Cannot fit requested classes in a single dex file error

multiDexEnabled true //added

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

}

dependencies {

implementation fileTree(dir: 'libs', include: ['*.jar'])

implementation 'androidx.appcompat:appcompat:1.1.0'

implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

testImplementation 'junit:junit:4.12'

androidTestImplementation 'androidx.test.ext:junit:1.1.1'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

implementation 'com.google.firebase:firebase-auth:19.2.0' //added

implementation 'com.google.firebase:firebase-firestore:21.4.1' //added

implementation 'com.firebaseui:firebase-ui-firestore:4.1.0' //added

implementation 'androidx.recyclerview:recyclerview:1.1.0' //added

//Cannot fit requested classes in a single dex file

implementation 'com.android.support:multidex:1.0.3' //added

}

MainActivity.java

package com.zatackcoder.firebasedatabaseexample;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initControls();
    }

    private void initControls() {
        Button addItemB = findViewById(R.id.addItemB);
        Button viewItemsB = findViewById(R.id.viewItemsB);

        addItemB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, AddItemActivity.class));
            }
        });

        viewItemsB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(MainActivity.this, ViewItemsActivity.class));
            }
        });
    }
}

package com.zatackcoder.firebasedatabaseexample;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initControls();

}

private void initControls() {

Button addItemB = findViewById(R.id.addItemB);

Button viewItemsB = findViewById(R.id.viewItemsB);

addItemB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(MainActivity.this, AddItemActivity.class));

}

});

viewItemsB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

startActivity(new Intent(MainActivity.this, ViewItemsActivity.class));

}

});

}

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_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <Button
            android:id="@+id/addItemB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add Item" />

        <Button
            android:id="@+id/viewItemsB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="View Items" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?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_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<Button

android:id="@+id/addItemB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Add Item" />

<Button

android:id="@+id/viewItemsB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="View Items" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

Item.java

package com.zatackcoder.firebasedatabaseexample;

public class Item {

    private String name;
    private String color;
    private Integer size;
    private Double price;

    public Item() {

    }

    public Item(String name, String color, Integer size, Double price) {
        this.name = name;
        this.color = color;
        this.size = size;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public Integer getSize() {
        return size;
    }

    //customised setter to overcome deserialize object error
    //java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to int
    public void setSize(Object size) {
        try {
            this.size = Integer.parseInt(size.toString());
        } catch (Exception e) {
            this.size = 0;
        }
    }

    public Double getPrice() {
        return price;
    }

    //customised setter to overcome deserialize object error
    //java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to double
    public void setPrice(Object price) {
        try {
            this.price = Double.parseDouble(price.toString());
        } catch (Exception e) {
            this.price = 0.00;
        }
    }
}

package com.zatackcoder.firebasedatabaseexample;

public class Item {

private String name;

private String color;

private Integer size;

private Double price;

public Item() {

}

public Item(String name, String color, Integer size, Double price) {

this.name = name;

this.color = color;

this.size = size;

this.price = price;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getColor() {

return color;

}

public void setColor(String color) {

this.color = color;

}

public Integer getSize() {

return size;

}

//customised setter to overcome deserialize object error

//java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to int

public void setSize(Object size) {

try {

this.size = Integer.parseInt(size.toString());

} catch (Exception e) {

this.size = 0;

}

public Double getPrice() {

return price;

}

//customised setter to overcome deserialize object error

//java.lang.RuntimeException: Could not deserialize object. Failed to convert a value of type java.lang.String to double

public void setPrice(Object price) {

try {

this.price = Double.parseDouble(price.toString());

} catch (Exception e) {

this.price = 0.00;

}

AddItemActivity.java

package com.zatackcoder.firebasedatabaseexample;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;

public class AddItemActivity extends AppCompatActivity {

    FirebaseFirestore db;
    EditText nameET;
    EditText colorET;
    EditText sizeET;
    EditText priceET;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_item);

        // Access a Cloud Firestore instance from your Activity
        db = FirebaseFirestore.getInstance();
        initControls();
    }

    private void initControls() {
        nameET = findViewById(R.id.nameET);
        colorET = findViewById(R.id.colorET);
        sizeET = findViewById(R.id.sizeET);
        priceET = findViewById(R.id.priceET);

        Button saveB = findViewById(R.id.saveB);
        saveB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Item item = new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString()));

                // Add a new document with a generated ID
                db.collection("items")
                        .add(item)
                        .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                            @Override
                            public void onSuccess(DocumentReference documentReference) {
                                nameET.setText("");
                                colorET.setText("");
                                sizeET.setText("");
                                priceET.setText("");
                                Toast.makeText(getApplicationContext(), "Item Added with ID: " + documentReference.getId(), Toast.LENGTH_LONG).show();
                            }
                        })
                        .addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                Toast.makeText(getApplicationContext(), "Error Adding Item! - " + e, Toast.LENGTH_LONG).show();
                            }
                        });
            }
        });
    }
}

package com.zatackcoder.firebasedatabaseexample;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.firestore.DocumentReference;

import com.google.firebase.firestore.FirebaseFirestore;

public class AddItemActivity extends AppCompatActivity {

FirebaseFirestore db;

EditText nameET;

EditText colorET;

EditText sizeET;

EditText priceET;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_add_item);

// Access a Cloud Firestore instance from your Activity

db = FirebaseFirestore.getInstance();

initControls();

}

private void initControls() {

nameET = findViewById(R.id.nameET);

colorET = findViewById(R.id.colorET);

sizeET = findViewById(R.id.sizeET);

priceET = findViewById(R.id.priceET);

Button saveB = findViewById(R.id.saveB);

saveB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Item item = new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString()));

// Add a new document with a generated ID

db.collection("items")

.add(item)

.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {

@Override

public void onSuccess(DocumentReference documentReference) {

nameET.setText("");

colorET.setText("");

sizeET.setText("");

priceET.setText("");

Toast.makeText(getApplicationContext(), "Item Added with ID: " + documentReference.getId(), Toast.LENGTH_LONG).show();

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

Toast.makeText(getApplicationContext(), "Error Adding Item! - " + e, Toast.LENGTH_LONG).show();

}

});

}

});

}

activity_add_item.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="com.zatackcoder.firebasedatabaseexample.AddItemActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add Item"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/nameET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:ems="10"
            android:hint="Name" />

        <EditText
            android:id="@+id/colorET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Color" />

        <EditText
            android:id="@+id/sizeET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Size" />

        <EditText
            android:id="@+id/priceET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Price" />

        <Button
            android:id="@+id/saveB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:text="Save" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?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="com.zatackcoder.firebasedatabaseexample.AddItemActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Add Item"

android:textSize="18sp"

android:textStyle="bold" />

<EditText

android:id="@+id/nameET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:ems="10"

android:hint="Name" />

<EditText

android:id="@+id/colorET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Color" />

<EditText

android:id="@+id/sizeET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Size" />

<EditText

android:id="@+id/priceET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Price" />

<Button

android:id="@+id/saveB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:text="Save" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

ItemAdapter.java

package com.zatackcoder.firebasedatabaseexample;

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.FirebaseFirestoreException;

public class ItemAdapter extends FirestoreRecyclerAdapter<Item, ItemAdapter.ItemViewHolder> {

    Context context;

    /**
     * Create a new RecyclerView adapter that listens to a Firestore Query.  See {@link
     * FirestoreRecyclerOptions} for configuration options.
     *
     * @param options
     */
    public ItemAdapter(Context context, @NonNull FirestoreRecyclerOptions<Item> options) {
        super(options);
        this.context = context;
    }

    @NonNull
    @Override
    public ItemAdapter.ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
        return new ItemAdapter.ItemViewHolder(view);
    }

    @Override
    protected void onBindViewHolder(@NonNull final ItemAdapter.ItemViewHolder itemViewHolder, int i, @NonNull Item item) {
        itemViewHolder.name.setText(item.getName());
        itemViewHolder.color.setText("Color: " + item.getColor());
        itemViewHolder.size.setText("Size: " + item.getSize().toString());
        itemViewHolder.price.setText("Price: " + item.getPrice().toString());

        final String documentId = getSnapshots().getSnapshot(i).getId();

        itemViewHolder.edit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(context, EditItemActivity.class);
                i.putExtra("documentId", documentId);
                context.startActivity(i);
            }
        });

        itemViewHolder.delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FirebaseFirestore db = FirebaseFirestore.getInstance();
                db.collection("items").document(documentId)
                        .delete()
                        .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        Toast.makeText(context, "Item deleted successfully!", Toast.LENGTH_LONG).show();
                    }
                });
            }
        });
    }

    @Override
    public void onError(@NonNull FirebaseFirestoreException e) {
        //super.onError(e);
    }

    public static class ItemViewHolder extends RecyclerView.ViewHolder {
        View container;
        TextView name;
        TextView color;
        TextView size;
        TextView price;
        Button edit;
        Button delete;

        public ItemViewHolder(View view) {
            super(view);
            container = view;
            name = view.findViewById(R.id.name);
            color = view.findViewById(R.id.color);
            size = view.findViewById(R.id.size);
            price = view.findViewById(R.id.price);
            edit = view.findViewById(R.id.edit);
            delete = view.findViewById(R.id.delete);
        }
    }
}

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package com.zatackcoder.firebasedatabaseexample;

import android.content.Context;

import android.content.Intent;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

import androidx.annotation.NonNull;

import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerAdapter;

import com.firebase.ui.firestore.FirestoreRecyclerOptions;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.FirebaseFirestoreException;

public class ItemAdapter extends FirestoreRecyclerAdapter<Item, ItemAdapter.ItemViewHolder> {

Context context;

/**

* Create a new RecyclerView adapter that listens to a Firestore Query. See {@link

* FirestoreRecyclerOptions} for configuration options.

* @param options

public ItemAdapter(Context context, @NonNull FirestoreRecyclerOptions<Item> options) {

super(options);

this.context = context;

}

@NonNull

@Override

public ItemAdapter.ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);

return new ItemAdapter.ItemViewHolder(view);

}

@Override

protected void onBindViewHolder(@NonNull final ItemAdapter.ItemViewHolder itemViewHolder, int i, @NonNull Item item) {

itemViewHolder.name.setText(item.getName());

itemViewHolder.color.setText("Color: " + item.getColor());

itemViewHolder.size.setText("Size: " + item.getSize().toString());

itemViewHolder.price.setText("Price: " + item.getPrice().toString());

final String documentId = getSnapshots().getSnapshot(i).getId();

itemViewHolder.edit.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent i = new Intent(context, EditItemActivity.class);

i.putExtra("documentId", documentId);

context.startActivity(i);

}

});

itemViewHolder.delete.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

FirebaseFirestore db = FirebaseFirestore.getInstance();

db.collection("items").document(documentId)

.delete()

.addOnSuccessListener(new OnSuccessListener<Void>() {

@Override

public void onSuccess(Void aVoid) {

Toast.makeText(context, "Item deleted successfully!", Toast.LENGTH_LONG).show();

}

});

}

});

}

@Override

public void onError(@NonNull FirebaseFirestoreException e) {

//super.onError(e);

}

public static class ItemViewHolder extends RecyclerView.ViewHolder {

View container;

TextView name;

TextView color;

TextView size;

TextView price;

Button edit;

Button delete;

public ItemViewHolder(View view) {

super(view);

container = view;

name = view.findViewById(R.id.name);

color = view.findViewById(R.id.color);

size = view.findViewById(R.id.size);

price = view.findViewById(R.id.price);

edit = view.findViewById(R.id.edit);

delete = view.findViewById(R.id.delete);

}

list_item.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="wrap_content"
    android:layout_margin="5dp"
    android:background="#ffffff"
    android:clickable="true"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?android:attr/selectableItemBackground"
        android:orientation="vertical"
        android:padding="5dp">

        <TextView
            android:id="@+id/name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Name"
            android:textFontWeight="bold"
            android:textSize="15dp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/color"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Color: Red"
                android:textSize="12dp" />

            <View
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_margin="5dp"
                android:background="#ADABAB" />

            <TextView
                android:id="@+id/size"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Size: 10"
                android:textSize="12dp" />

            <View
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_margin="5dp"
                android:background="#ADABAB" />

            <TextView
                android:id="@+id/price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Price: 100"
                android:textSize="12dp" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <Button
                android:id="@+id/edit"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:textSize="10dp"
                android:text="Edit" />

            <Button
                android:id="@+id/delete"
                android:layout_width="wrap_content"
                android:layout_height="35dp"
                android:textSize="10dp"
                android:textColor="#F00"
                android:text="Delete"/>
            
        </LinearLayout>

    </LinearLayout>

</LinearLayout>

<?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="wrap_content"

android:layout_margin="5dp"

android:background="#ffffff"

android:clickable="true"

android:orientation="vertical">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="?android:attr/selectableItemBackground"

android:orientation="vertical"

android:padding="5dp">

<TextView

android:id="@+id/name"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Name"

android:textFontWeight="bold"

android:textSize="15dp" />

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<TextView

android:id="@+id/color"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Color: Red"

android:textSize="12dp" />

<View

android:layout_width="1dp"

android:layout_height="match_parent"

android:layout_margin="5dp"

android:background="#ADABAB" />

<TextView

android:id="@+id/size"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Size: 10"

android:textSize="12dp" />

<View

android:layout_width="1dp"

android:layout_height="match_parent"

android:layout_margin="5dp"

android:background="#ADABAB" />

<TextView

android:id="@+id/price"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Price: 100"

android:textSize="12dp" />

</LinearLayout>

<LinearLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/edit"

android:layout_width="wrap_content"

android:layout_height="35dp"

android:textSize="10dp"

android:text="Edit" />

<Button

android:id="@+id/delete"

android:layout_width="wrap_content"

android:layout_height="35dp"

android:textSize="10dp"

android:textColor="#F00"

android:text="Delete"/>

</LinearLayout>

ViewItemsActivity.java

package com.zatackcoder.firebasedatabaseexample;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;

public class ViewItemsActivity extends AppCompatActivity {

    FirebaseFirestore db;
    private RecyclerView mRecyclerView;
    private RecyclerView.LayoutManager mLayoutManager;
    private ItemAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_items);
        setTitle("Items");

        mRecyclerView = findViewById(R.id.recycler_view);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);

        db = FirebaseFirestore.getInstance();
        Query query = db.collection("items").orderBy("name", Query.Direction.ASCENDING);
        FirestoreRecyclerOptions<Item> options = new FirestoreRecyclerOptions.Builder<Item>()
                .setQuery(query, Item.class)
                .build();

        adapter = new ItemAdapter(this, options);
        mRecyclerView.setAdapter(adapter);
    }

    @Override
    protected void onStart() {
        super.onStart();
        adapter.startListening();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (adapter != null) {
            adapter.stopListening();
        }
    }
}

package com.zatackcoder.firebasedatabaseexample;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerOptions;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.Query;

public class ViewItemsActivity extends AppCompatActivity {

FirebaseFirestore db;

private RecyclerView mRecyclerView;

private RecyclerView.LayoutManager mLayoutManager;

private ItemAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_view_items);

setTitle("Items");

mRecyclerView = findViewById(R.id.recycler_view);

mRecyclerView.setHasFixedSize(true);

mLayoutManager = new LinearLayoutManager(this);

mRecyclerView.setLayoutManager(mLayoutManager);

db = FirebaseFirestore.getInstance();

Query query = db.collection("items").orderBy("name", Query.Direction.ASCENDING);

FirestoreRecyclerOptions<Item> options = new FirestoreRecyclerOptions.Builder<Item>()

.setQuery(query, Item.class)

.build();

adapter = new ItemAdapter(this, options);

mRecyclerView.setAdapter(adapter);

}

@Override

protected void onStart() {

super.onStart();

adapter.startListening();

}

@Override

protected void onStop() {

super.onStop();

if (adapter != null) {

adapter.stopListening();

}

activity_view_items.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"
    android:padding="5dp"
    tools:context=".ViewItemsActivity">


    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteX="1dp"
        tools:layout_editor_absoluteY="1dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?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"

android:padding="5dp"

tools:context=".ViewItemsActivity">

<androidx.recyclerview.widget.RecyclerView

android:id="@+id/recycler_view"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:layout_editor_absoluteX="1dp"

tools:layout_editor_absoluteY="1dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

EditItemActivity.java

package com.zatackcoder.firebasedatabaseexample;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;

import java.util.HashMap;
import java.util.Map;

public class EditItemActivity extends AppCompatActivity {

    FirebaseFirestore db;
    EditText nameET;
    EditText colorET;
    EditText sizeET;
    EditText priceET;
    String documentId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_item);

        db = FirebaseFirestore.getInstance();
        Intent i = getIntent();
        documentId = i.getStringExtra("documentId");
        if(documentId == null || documentId.isEmpty()) {
            startActivity(new Intent(this, ViewItemsActivity.class));
            finish();
        }
        initControls();
    }

    private void initControls() {
        nameET = findViewById(R.id.nameET);
        colorET = findViewById(R.id.colorET);
        sizeET = findViewById(R.id.sizeET);
        priceET = findViewById(R.id.priceET);

        Button saveB = findViewById(R.id.saveB);
        saveB.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Item item = new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString()));
                // Update a existing document with a document ID
                db.collection("items").document(documentId)
                        .set(item)
                        .addOnSuccessListener(new OnSuccessListener<Void>() {
                            @Override
                            public void onSuccess(Void aVoid) {
                                Toast.makeText(getApplicationContext(), "Item Updated with ID: " + documentId, Toast.LENGTH_LONG).show();
                            }
                        })
                        .addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                Toast.makeText(getApplicationContext(), "Error Updating Item! - " + e, Toast.LENGTH_LONG).show();
                            }
                        });
            }
        });

        DocumentReference docRef = db.collection("items").document(documentId);
        docRef.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
            @Override
            public void onSuccess(DocumentSnapshot documentSnapshot) {
                Item item = documentSnapshot.toObject(Item.class);
                nameET.setText(item.getName());
                colorET.setText(item.getColor());
                sizeET.setText(item.getSize().toString());
                priceET.setText(item.getPrice().toString());
            }
        });
    }
}

package com.zatackcoder.firebasedatabaseexample;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.firestore.DocumentReference;

import com.google.firebase.firestore.DocumentSnapshot;

import com.google.firebase.firestore.FirebaseFirestore;

import java.util.HashMap;

import java.util.Map;

public class EditItemActivity extends AppCompatActivity {

FirebaseFirestore db;

EditText nameET;

EditText colorET;

EditText sizeET;

EditText priceET;

String documentId;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_edit_item);

db = FirebaseFirestore.getInstance();

Intent i = getIntent();

documentId = i.getStringExtra("documentId");

if(documentId == null || documentId.isEmpty()) {

startActivity(new Intent(this, ViewItemsActivity.class));

finish();

}

initControls();

}

private void initControls() {

nameET = findViewById(R.id.nameET);

colorET = findViewById(R.id.colorET);

sizeET = findViewById(R.id.sizeET);

priceET = findViewById(R.id.priceET);

Button saveB = findViewById(R.id.saveB);

saveB.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Item item = new Item(nameET.getText().toString(), colorET.getText().toString(), Integer.parseInt(sizeET.getText().toString()), Double.parseDouble(priceET.getText().toString()));

// Update a existing document with a document ID

db.collection("items").document(documentId)

.set(item)

.addOnSuccessListener(new OnSuccessListener<Void>() {

@Override

public void onSuccess(Void aVoid) {

Toast.makeText(getApplicationContext(), "Item Updated with ID: " + documentId, Toast.LENGTH_LONG).show();

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

Toast.makeText(getApplicationContext(), "Error Updating Item! - " + e, Toast.LENGTH_LONG).show();

}

});

}

});

DocumentReference docRef = db.collection("items").document(documentId);

docRef.get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {

@Override

public void onSuccess(DocumentSnapshot documentSnapshot) {

Item item = documentSnapshot.toObject(Item.class);

nameET.setText(item.getName());

colorET.setText(item.getColor());

sizeET.setText(item.getSize().toString());

priceET.setText(item.getPrice().toString());

}

});

}

activity_edit_item.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=".EditItemActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Edit Item"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/nameET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:ems="10"
            android:hint="Name" />

        <EditText
            android:id="@+id/colorET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Color" />

        <EditText
            android:id="@+id/sizeET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Size" />

        <EditText
            android:id="@+id/priceET"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Price" />

        <Button
            android:id="@+id/saveB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:text="Update" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

<?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=".EditItemActivity">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Edit Item"

android:textSize="18sp"

android:textStyle="bold" />

<EditText

android:id="@+id/nameET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:ems="10"

android:hint="Name" />

<EditText

android:id="@+id/colorET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Color" />

<EditText

android:id="@+id/sizeET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Size" />

<EditText

android:id="@+id/priceET"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Price" />

<Button

android:id="@+id/saveB"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="50dp"

android:text="Update" />

</LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

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