How to solve Android Firestore database DexArchiveMergerException Unable to merge dex

In this android programming source code example, we are going to solve Android Firestore database DexArchiveMergerException Unable to merge dex.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to solve Android Firestore database DexArchiveMergerException Unable to merge dex.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp"
    android:background="#CACACA">

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/titleinput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="90dp">
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/title"
            android:inputType="textNoSuggestions"
            android:maxLines="1"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/bodyinput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/titleinput">
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/body"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/body"
            android:inputType="textNoSuggestions"
            android:maxLines="1"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>


    <Button
        android:id="@+id/submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_below="@id/bodyinput"
        android:textColor="#ffffff"
        android:text="Submit"/>

</RelativeLayout>

MainActivity.java

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

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.bluapp.androidview2.R;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.material.textfield.TextInputEditText;
import com.google.firebase.firestore.FirebaseFirestore;

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

public class FirestoreActivity19 extends AppCompatActivity {
    private TextInputEditText title;
    private TextInputEditText body;
    private FirebaseFirestore mDatabase;
    private Button submit;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firestore19);
        title = (TextInputEditText)findViewById(R.id.title);
        body = (TextInputEditText)findViewById(R.id.body);
        submit = (Button)findViewById(R.id.submit);
        mDatabase = FirebaseFirestore.getInstance();

        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String enteredtitle = title.getText().toString();
                String enteredbody = body.getText().toString();
                saveDocument(enteredtitle, enteredbody);
            }
        });
    }

    private void saveDocument(String strTitle, String strBody){
        Map<String, Object> post = new HashMap<>();
        post.put("title", strTitle);
        post.put("body", strBody);
        mDatabase.collection("AndroidView").document("Post").set(post)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        Toast.makeText(FirestoreActivity19.this,"Document Inserted",Toast.LENGTH_LONG).show();
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(FirestoreActivity19.this,e.getMessage(),Toast.LENGTH_LONG).show();
                        Log.d("Androidview", e.getMessage());
                    }
                });
    }
}

app/build.gradle

android {
    compileSdkVersion 28
    defaultConfig {
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.google.firebase:firebase-core:16.0.9'
    implementation 'com.google.firebase:firebase-firestore:19.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}

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