How to limit the amount of document retrieve from Android Firestore Database

In this android programming source code example, we are going to limit the amount of document to return from Android Firestore Database.

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 limit the amount of document to return from Android Firestore Database.

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">

    <TextView
        android:id="@+id/title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="title"
        android:textSize="20sp"
        android:layout_marginTop="90dp"/>

    <View
        android:id="@+id/view1"
        android:layout_width="match_parent"
        android:layout_height="2sp"
        android:layout_below="@id/title"
        android:background="@color/colorAccent"/>

    <TextView
        android:id="@+id/body"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="body"
        android:textSize="30sp"
        android:layout_below="@id/view1"/>

</RelativeLayout>

MainActivity.java

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

import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import com.google.firebase.firestore.QuerySnapshot;

public class FirestoreActivity14 extends AppCompatActivity {
    private TextView title;
    private TextView body;
    private FirebaseFirestore mDatabase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firestore14);
        title = (TextView)findViewById(R.id.title);
        body = (TextView)findViewById(R.id.body);
        mDatabase = FirebaseFirestore.getInstance();
        Query query = mDatabase.collection("AndroidView").limit(1);
        query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if(task.isSuccessful()){
                    QuerySnapshot queryDocumentSnapshots = task.getResult();
                    for(DocumentSnapshot readData: queryDocumentSnapshots.getDocuments()){
                        title.setText(readData.get("title").toString());
                        body.setText(readData.get("body").toString());
                    }

                }
            }
        })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(FirestoreActivity14.this,e.getMessage(),Toast.LENGTH_LONG).show();
                        Log.d("Androidview", e.getMessage());
                    }
                });
    }
}

app/build.gradle

implementation 'com.google.firebase:firebase-core:16.0.9'
implementation 'com.google.firebase:firebase-firestore:19.0.0'

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