[embedyt] https://www.youtube.com/watch?v=TBr_5QH1EvQ[/embedyt]
Links & Dependenciesactivity_main.xmlMainActivity.java
Firebase setup guide with dependencies and console link:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:orientation="vertical" android:padding="16dp" tools:context="com.codinginflow.firestoreexampleproject.MainActivity"> <EditText android:id="@+id/edit_text_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Title" android:inputType="text" /> <EditText android:id="@+id/edit_text_description" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Description" android:inputType="text" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="saveNote" android:text="Save" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="loadNote" android:text="Load" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="updateDescription" android:text="Update description" /> <TextView android:id="@+id/text_view_data" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" /> </LinearLayout>
package com.codinginflow.firestoreexampleproject; import android.support.annotation.NonNull; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.EditText; import android.widget.TextView; 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.EventListener; import com.google.firebase.firestore.FirebaseFirestore; import com.google.firebase.firestore.FirebaseFirestoreException; import com.google.firebase.firestore.SetOptions; import java.util.HashMap; import java.util.Map; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private static final String KEY_TITLE = "title"; private static final String KEY_DESCRIPTION = "description"; private EditText editTextTitle; private EditText editTextDescription; private TextView textViewData; private FirebaseFirestore db = FirebaseFirestore.getInstance(); private DocumentReference noteRef = db.document("Notebook/My First Note"); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editTextTitle = findViewById(R.id.edit_text_title); editTextDescription = findViewById(R.id.edit_text_description); textViewData = findViewById(R.id.text_view_data); } @Override protected void onStart() { super.onStart(); noteRef.addSnapshotListener(this, new EventListener<DocumentSnapshot>() { @Override public void onEvent(DocumentSnapshot documentSnapshot, FirebaseFirestoreException e) { if (e != null) { Toast.makeText(MainActivity.this, "Error while loading!", Toast.LENGTH_SHORT).show(); Log.d(TAG, e.toString()); return; } if (documentSnapshot.exists()) { String title = documentSnapshot.getString(KEY_TITLE); String description = documentSnapshot.getString(KEY_DESCRIPTION); textViewData.setText("Title: " + title + "\n" + "Description: " + description); } } }); } public void saveNote(View v) { String title = editTextTitle.getText().toString(); String description = editTextDescription.getText().toString(); Map<String, Object> note = new HashMap<>(); note.put(KEY_TITLE, title); note.put(KEY_DESCRIPTION, description); noteRef.set(note) .addOnSuccessListener(new OnSuccessListener<Void>() { @Override public void onSuccess(Void aVoid) { Toast.makeText(MainActivity.this, "Note saved", Toast.LENGTH_SHORT).show(); } }) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { Toast.makeText(MainActivity.this, "Error!", Toast.LENGTH_SHORT).show(); Log.d(TAG, e.toString()); } }); } public void updateDescription(View v) { String description = editTextDescription.getText().toString(); //Map<String, Object> note = new HashMap<>(); //note.put(KEY_DESCRIPTION, description); //noteRef.set(note, SetOptions.merge()); noteRef.update(KEY_DESCRIPTION, description); } public void loadNote(View v) { noteRef.get() .addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() { @Override public void onSuccess(DocumentSnapshot documentSnapshot) { if (documentSnapshot.exists()) { String title = documentSnapshot.getString(KEY_TITLE); String description = documentSnapshot.getString(KEY_DESCRIPTION); //Map<String, Object> note = documentSnapshot.getData(); textViewData.setText("Title: " + title + "\n" + "Description: " + description); } else { Toast.makeText(MainActivity.this, "Document does not exist", Toast.LENGTH_SHORT).show(); } } }) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { Toast.makeText(MainActivity.this, "Error!", Toast.LENGTH_SHORT).show(); Log.d(TAG, e.toString()); } }); } }