Day29 - 使用Firebase與Android studio實現登入 (下篇) - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天

2023 iThome 鐵人賽

DAY 29

Mobile Development

Android studio使用過程與開發說明系列第 29 篇

Day29 - 使用Firebase與Android studio實現登入 (下篇)

15th鐵人賽

aa30742030

團隊nutc_imac_function

2023-10-09 00:55:29

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功能

題外話，照片的人是我的朋友照片，因為覺得很好笑所以就把他抓進來做實驗。

登入成功的部分，不過這裡我只會教登入和建立帳號的部分。

套件安裝

1.先安裝套見到build.greadle(Module :app)

安裝MultiDex

      //MultiDex
      implementation 'androidx.multidex:multidex:2.0.1'

在android裡的defaultConfig打上這行啟動它

   multiDexEnabled true

安裝Rounded ImageView
這是物件的套件，可以不使用沒關西，我頭象的部局是靠它做的

     //Rounded ImageView
     implementation 'com.makeramen:roundedimageview:2.3.0'

*在android{}裡打上這個新的
*這個套件可以幫助我們不用一直重寫findViewById()的部分

    buildFeatures{
        viewBinding true
    }

程式碼

創立兩個Empty Activity

取名為SingInActivity、SingUpActivity，畫面如下
Notice:MainActivity是原本就有的，不理會。
部局你的layout
這裡只要確定有這些物件就可以了

3.創建一個資料夾(unilities)，在裡面建立一個class 名叫做Constants(常數)

這些都是常用到的常數，有了這個就不需要一直去特別記住Key的部分。
Constants

public class Constants {
    public static final String KEY_COLLECTION_USER = "user";
    public static final String KEY_NAME = "name";
    public static final String KEY_EMAIL = "email";
    public static final String KEY_PASSWORD = "password";
    public static final String KEY_PREFERENCE_NAME = "chatAppPreference";
    public static final String KEY_IS_SIGNED_IN = "isSignedIn";
    public static final String KEY_USER_ID = "userId";
    public static final String KEY_IMAGE = "image";
    public static final String KEY_FCM_TOKEN = "fcmToken";
    public static final String KEY_USER = "user";
    }

4. 寫程式碼
在程式碼裡如果看到progressBar的話話直接省略
SingInActivity


import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;


import android.util.Patterns;
import android.view.View;
import android.widget.Toast;

import com.example.icecharapp.databinding.ActivitySinginBinding;
import com.example.icecharapp.ui.MainActivity;
import com.example.icecharapp.unilities.Constants;
import com.example.icecharapp.unilities.SharedPreferencesManager;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;


public class SingInActivity extends AppCompatActivity {
    //使用 ActivitySingInBinding 需要再build.gradle 的android{} 增新
    //buildFeatures{
    //    viewBinding true
    //}
    private ActivitySinginBinding binding;
    private SharedPreferencesManager sharedPreferencesManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivitySinginBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        setListeners();
    }

    private void setListeners(){
        //轉跳頁面
        binding.textCreateNewAccount.setOnClickListener(view ->
                startActivity(new Intent(getApplicationContext(), SingUpActivity.class)));
        binding.buttonSignIn.setOnClickListener(view ->{
            SingIn();
        });
    }
    private void SingIn(){
        loading(true);
        FirebaseFirestore database = FirebaseFirestore.getInstance();
        database.collection(Constants.KEY_COLLECTION_USER)
                .whereEqualTo(Constants.KEY_EMAIL, binding.inputEmail.getText().toString())
                .whereEqualTo(Constants.KEY_PASSWORD, binding.inputPassword.getText().toString())
                .get()
                .addOnCompleteListener(task -> {
                    if(task.isSuccessful() && task.getResult() != null && task.getResult().getDocuments().size() > 0){
                        DocumentSnapshot documentSnapshot = task.getResult().getDocuments().get(0);
                        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);
                    }
                    else{
                        loading(false);
                        showToast("Unable to sign in");
                    }
                });
    }
    private void loading(Boolean isLoading){
        if (isLoading){
            binding.buttonSignIn.setVisibility(View.INVISIBLE);
            binding.progressBar.setVisibility(View.VISIBLE);
        }
        else {
            binding.buttonSignIn.setVisibility(View.VISIBLE);
            binding.progressBar.setVisibility(View.INVISIBLE);
        }
    }
    private void showToast(String message){
        Toast.makeText(getApplicationContext(), message,Toast.LENGTH_SHORT).show();
    }
    private Boolean isValidSignInDetails(){
        if(binding.inputEmail.getText().toString().trim().isEmpty()){
            showToast("Enter email");
            return false;
        }
        else if(!Patterns.EMAIL_ADDRESS.matcher(binding.inputEmail.getText().toString()).matches()){
            showToast("Enter void email");
            return false;
        }
        else if(binding.inputPassword.getText().toString().trim().isEmpty()){
            showToast("Enter password");
            return false;
        }
        else {
            return true;
        }
    }
}

SingUpActivity

import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Base64;
import android.util.Patterns;
import android.view.View;
import android.widget.Toast;


import com.example.icecharapp.databinding.ActivitySingUpBinding;
import com.example.icecharapp.ui.MainActivity;
import com.example.icecharapp.unilities.Constants;
import com.example.icecharapp.unilities.SharedPreferencesManager;
import com.google.firebase.firestore.FirebaseFirestore;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.HashMap;


public class SingUpActivity extends AppCompatActivity {
    private ActivitySingUpBinding binding;
    private SharedPreferencesManager sharedPreferencesManager;
    private String encodeImage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivitySingUpBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());
        sharedPreferencesManager = new SharedPreferencesManager(getApplicationContext());
        setListeners();
    }
    private void setListeners(){
        //返回上一個頁面
        binding.textSignIn.setOnClickListener(v -> onBackPressed());
        //Sign Up
        binding.buttonSignUp.setOnClickListener(view -> {
            if (isValidSingUpDetails()){
                singUp();
            }
        });
        binding.layoutImage.setOnClickListener(view -> {
            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            intent.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);
            pickImage.launch(intent);
        });
    }

    private void showToast(String message){
        Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
    }
    private void singUp(){
        loading(true);
        FirebaseFirestore database = FirebaseFirestore.getInstance();
        HashMap<String,Object> user = new HashMap<>();
        user.put(Constants.KEY_NAME, binding.inputName.getText().toString());
        user.put(Constants.KEY_EMAIL, binding.inputEmail.getText().toString());
        user.put(Constants.KEY_PASSWORD, binding.inputPassword.getText().toString());
        user.put(Constants.KEY_IMAGE, encodeImage);
        database.collection(Constants.KEY_COLLECTION_USER)
                .add(user)
                .addOnSuccessListener(documentReference -> {
                    loading(false);
                    Intent intent = new Intent(getApplicationContext(), MainActivity.class);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                    startActivity(intent);
                })
                .addOnFailureListener(e -> {
                    loading(false);
                    showToast(e.getMessage());
                });
    }
    private String encodeImage(Bitmap bitmap){
        int previewWidth = 150;
        int previewHeight = bitmap.getHeight() * previewWidth / bitmap.getWidth();
        Bitmap previewBitmap = Bitmap.createScaledBitmap(bitmap, previewWidth, previewHeight,false);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        previewBitmap.compress(Bitmap.CompressFormat.JPEG, 50, byteArrayOutputStream);
        byte[] bytes = byteArrayOutputStream.toByteArray();
        return Base64.encodeToString(bytes,Base64.DEFAULT);
    }
    private final ActivityResultLauncher<Intent> pickImage = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            result -> {
                if(result.getResultCode() == RESULT_OK){
                    if(result.getData() != null){
                        Uri imageUri = result.getData().getData();
                        try {
                            InputStream inputStream = getContentResolver().openInputStream(imageUri);
                            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                            binding.imageProfile.setImageBitmap(bitmap);
                            binding.textAddImage.setVisibility(View.GONE);
                            encodeImage = encodeImage(bitmap);
                        }
                        catch (FileNotFoundException e){
                            e.printStackTrace();
                        }
                    }
                }
            }

    );
    private Boolean isValidSingUpDetails(){
        if (encodeImage == null) {
            showToast("Select profile image");
            return false;
        }
        else if (binding.inputName.getText().toString().trim().isEmpty()){
            showToast("Enter name");
            return false;
        }
        else if (binding.inputEmail.getText().toString().trim().isEmpty()){
            showToast("Enter Email");
            return false;
        }
        else if (!Patterns.EMAIL_ADDRESS.matcher(binding.inputEmail.getText().toString()).matches()){
            showToast("Enter valid Email");
            //檢查一個字串是否為有效的電子郵件地址
            return false;
        }
        else if (binding.inputPassword.getText().toString().trim().isEmpty()){
            showToast("Enter password");
            return false;
        }
        else if (binding.inputConfirmPassword.getText().toString().trim().isEmpty()){
            showToast("Enter Confirm Password");
            return false;
        }
        else if (!binding.inputPassword.getText().toString().equals(binding.inputConfirmPassword.getText().toString())){
            showToast("Password & confirm password must be same");
            return false;
        }
        else {
            return true;
        }
    }
    private void loading(Boolean isLoading){
        if(isLoading){
            binding.buttonSignUp.setVisibility(View.INVISIBLE);
            binding.progressBar.setVisibility(View.VISIBLE);
        }
        else{
            binding.buttonSignUp.setVisibility(View.VISIBLE);
            binding.progressBar.setVisibility(View.INVISIBLE);
        }
    }
}

完成之後就可以去建立一個創號試試，然後在你的Firebase的Firestore部分可意看到資料有增新。
只需要看user的部分就好了，其他的Conversation、chat是後續的功能，這裡我不做教學用。