Showing posts with label Android. Show all posts
Showing posts with label Android. Show all posts

Sunday 24 December 2023

Meta Android Developer Professional Certificate

 


What you'll learn

Gain the skills required for an entry-level career as an Android developer. 

Learn how to create applications for Android including how to build and manage the lifecycle of a mobile app using Android Studio.

Learn coding in Kotlin and the programming fundamentals for how to create the user interface (UI) and best practices for design.   

Create cross-platform mobile applications using React Native. Demonstrate your new skills by creating a job-ready portfolio you can show during interviews.

Join Free: Meta Android Developer Professional Certificate

Prepare for a career in Android Development

Receive professional-level training from Meta
Demonstrate your proficiency in portfolio-ready projects
Earn an employer-recognized certificate from Meta
Qualify for in-demand job titles: Android Developer, Mobile Applications Developer, Mobile Developer

Tuesday 15 June 2021

Login with Retrofit in android Studio with SourceCode | Login and Registration form in android using JSON example

 Build.gradle File:-  
 
implementation 'com.google.android.material:material:1.3.0'
implementation 'com.squareup.retrofit2:retrofit:2.8.1'
implementation 'com.squareup.retrofit2:converter-gson:2.8.1'
implementation 'com.squareup.okhttp3:logging-interceptor:4.6.0'
 
 Activity-main 
<?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:orientation="vertical"
android:background="@color/colorWhite"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:text="Login to continue"
android:layout_marginTop="100dp"
android:textSize="24sp"
android:layout_gravity="center_horizontal"
android:textColor="@color/colorPrimaryDark"
android:layout_height="wrap_content" />

<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_marginTop="30dp"
android:layout_marginStart="30dp"
android:layout_marginEnd="30dp"
android:hint="Username"
android:layout_height="wrap_content">

<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:inputType="text"
android:id="@+id/edUsername"
android:layout_height="wrap_content" />

</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_marginTop="30dp"
android:hint="Password"
android:layout_marginStart="30dp"
android:layout_marginEnd="30dp"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:inputType="textPassword"
android:id="@+id/edPassword"
android:layout_height="wrap_content" />
</com.google.android.material.textfield.TextInputLayout>
<Button
android:layout_width="match_parent"
android:layout_margin="30dp"
android:text="Login"
android:id="@+id/btnLogin"
android:background="@color/colorPrimary"
android:textColor="@color/colorWhite"
android:layout_height="wrap_content" />
</LinearLayout
 
 Java File :-
 
1. Api Client 
 
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class ApiClient {

private static Retrofit getRetrofit(){

HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(httpLoggingInterceptor).build();

Retrofit retrofit = new Retrofit.Builder()
.addConverterFactory(GsonConverterFactory.create())
.baseUrl("http://api.irawen.net/") //Change server URL
.client(okHttpClient)
.build();

return retrofit;
}


public static UserService getUserService(){
UserService userService = getRetrofit().create(UserService.class);

return userService;
}

}

2. Login Request :-
 
public class LoginRequest {

private String username;
private String password;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}
}

3. Login response :- 
 
public class LoginResponse {


private int user_id;
private String email;
private String username;

public int getUser_id() {
return user_id;
}

public void setUser_id(int user_id) {
this.user_id = user_id;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}
}
 
4. Main Activity :-
 import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.material.textfield.TextInputEditText;

import androidx.appcompat.app.AppCompatActivity;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {


TextInputEditText username, password;
Button btnLogin;

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

username = findViewById(R.id.edUsername);
password = findViewById(R.id.edPassword);
btnLogin = findViewById(R.id.btnLogin);

btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

if(TextUtils.isEmpty(username.getText().toString()) || TextUtils.isEmpty(password.getText().toString())){
Toast.makeText(MainActivity.this,"Username / Password Required", Toast.LENGTH_LONG).show();
}else{
//proceed to login
login();
}

}
});
}


public void login(){
LoginRequest loginRequest = new LoginRequest();
loginRequest.setUsername(username.getText().toString());
loginRequest.setPassword(password.getText().toString());

Call<LoginResponse> loginResponseCall = ApiClient.getUserService().userLogin(loginRequest);
loginResponseCall.enqueue(new Callback<LoginResponse>() {
@Override
public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {

if(response.isSuccessful()){
Toast.makeText(MainActivity.this,"Login Successful", Toast.LENGTH_LONG).show();
LoginResponse loginResponse = response.body();

new Handler().postDelayed(new Runnable() {
@Override
public void run() {

startActivity(new Intent(MainActivity.this,DashboardActivity.class).putExtra("data",loginResponse.getUsername()));
}
},700);

}else{
Toast.makeText(MainActivity.this,"Login Failed", Toast.LENGTH_LONG).show();

}

}

@Override
public void onFailure(Call<LoginResponse> call, Throwable t) {
Toast.makeText(MainActivity.this,"Throwable "+t.getLocalizedMessage(), Toast.LENGTH_LONG).show();

}
});


}

}

5. User Service :-
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.POST;

public interface UserService {


@POST("authenticate/")
Call<LoginResponse> userLogin(@Body LoginRequest loginRequest);


}

Wednesday 10 February 2021

Calculator in android studio with Source Code | Calculator in Android studio | Clcoding

 Activity Main :
<?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:background="#000"
tools:context=".MainActivity">


<Button
android:id="@+id/button1"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="1"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.043"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.817" />

<Button
android:id="@+id/button2"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="2"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.352"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.817" />

<Button
android:id="@+id/button3"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="3"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.672"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.817" />

<Button
android:id="@+id/button4"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="4"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.043"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.677" />

<Button
android:id="@+id/button5"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="5"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.352"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.677" />

<Button
android:id="@+id/button6"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="6"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.672"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.677" />

<Button
android:id="@+id/button7"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="7"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.043"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.541" />

<Button
android:id="@+id/button8"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="8"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.352"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.541" />

<Button
android:id="@+id/button9"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="9"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.672"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.541" />

<Button
android:id="@+id/button0"
android:layout_width="185dp"
android:layout_height="80dp"
android:background="@drawable/new_but"
android:paddingRight="95sp"
android:text="0"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.061"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.957" />

<Button
android:id="@+id/button_equal"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/arithmatic_button"
android:text="="
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.99"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.958" />

<Button
android:id="@+id/button_multi"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/arithmatic_button"
android:text="×"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.99"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.541" />

<Button
android:id="@+id/button_divide"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/arithmatic_button"
android:text="/"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.987"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.406" />

<Button
android:id="@+id/button_add"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/arithmatic_button"
android:text="+"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.99"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.817" />

<Button
android:id="@+id/button_sub"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/arithmatic_button"
android:text="-"
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.99"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.677" />

<Button
android:id="@+id/button_clear"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/button"
android:text="AC"
android:textColor="#060606"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.043"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.406" />

<Button
android:id="@+id/button_para1"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/button"
android:text="%"
android:textColor="#060606"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.672"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.406" />

<Button
android:id="@+id/button_para2"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/button"
android:text="+/-"
android:textColor="#060606"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.349"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.406" />

<Button
android:id="@+id/button_dot"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="@drawable/circle_button"
android:text="."
android:textColor="#ffff"
android:textSize="28sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.671"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.958" />

<TextView
android:id="@+id/input"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/background_light"
android:textSize="68sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.909"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.252" />

<TextView
android:id="@+id/output"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/background_light"
android:textSize="36sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.909"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.051" />

</androidx.constraintlayout.widget.ConstraintLayout>
 
Main Activity :


import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.TypedValue;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private Button b1;
private Button b2;
private Button b3;
private Button b4;
private Button b5;
private Button b6;
private Button b7;
private Button b8;
private Button b9;
private Button b0;
private Button b_equal;
private Button b_multi;
private Button b_divide;
private Button b_add;
private Button b_sub;
private Button b_clear;
private Button b_dot;
private Button b_para1;
private Button b_para2;
private TextView t1;
private TextView t2;
private final char ADDITION = '+';
private final char SUBTRACTION = '-';
private final char MULTIPLICATION = '*';
private final char DIVISION = '/';
private final char EQU = '=';
private final char EXTRA = '@';
private final char MODULUS = '%';
private char ACTION;
private double val1 = Double.NaN;
private double val2;

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

b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "1");
}
});

b2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "2");
}
});

b3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "3");
}
});

b4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "4");
}
});

b5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "5");
}
});

b6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "6");
}
});

b7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "7");
}
});

b8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "8");
}
});

b9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "9");
}
});

b0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifErrorOnOutput();
exceedLength();
t1.setText(t1.getText().toString() + "0");
}
});

b_dot.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
exceedLength();
t1.setText(t1.getText().toString() + ".");
}
});

b_para1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
ACTION = MODULUS;
operation();
if (!ifReallyDecimal()) {
t2.setText(val1 + "%");
} else {
t2.setText((int) val1 + "%");
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
ACTION = ADDITION;
operation();
if (!ifReallyDecimal()) {
t2.setText(val1 + "+");
} else {
t2.setText((int) val1 + "+");
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
ACTION = SUBTRACTION;
operation();
if (t1.getText().length() > 0)
if (!ifReallyDecimal()) {
t2.setText(val1 + "-");
} else {
t2.setText((int) val1 + "-");
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_multi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
ACTION = MULTIPLICATION;
operation();
if (!ifReallyDecimal()) {
t2.setText(val1 + "×");
} else {
t2.setText((int) val1 + "×");
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_divide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
ACTION = DIVISION;
operation();
if (ifReallyDecimal()) {
t2.setText((int) val1 + "/");
} else {
t2.setText(val1 + "/");
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_para2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (!t2.getText().toString().isEmpty() || !t1.getText().toString().isEmpty()) {
val1 = Double.parseDouble(t1.getText().toString());
ACTION = EXTRA;
t2.setText("-" + t1.getText().toString());
t1.setText("");
} else {
t2.setText("Error");
}
}
});

b_equal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
operation();
ACTION = EQU;
if (!ifReallyDecimal()) {
t2.setText(/*t2.getText().toString() + String.valueOf(val2) + "=" + */String.valueOf(val1));
} else {
t2.setText(/*t2.getText().toString() + String.valueOf(val2) + "=" + */String.valueOf((int) val1));
}
t1.setText(null);
} else {
t2.setText("Error");
}
}
});

b_clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (t1.getText().length() > 0) {
CharSequence name = t1.getText().toString();
t1.setText(name.subSequence(0, name.length() - 1));
} else {
val1 = Double.NaN;
val2 = Double.NaN;
t1.setText("");
t2.setText("");
}
}
});

// Empty text views on long click.
b_clear.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
val1 = Double.NaN;
val2 = Double.NaN;
t1.setText("");
t2.setText("");
return true;
}
});
}

private void viewSetup() {
b1 = findViewById(R.id.button1);
b2 = findViewById(R.id.button2);
b3 = findViewById(R.id.button3);
b4 = findViewById(R.id.button4);
b5 = findViewById(R.id.button5);
b6 = findViewById(R.id.button6);
b7 = findViewById(R.id.button7);
b8 = findViewById(R.id.button8);
b9 = findViewById(R.id.button9);
b0 = findViewById(R.id.button0);
b_equal = findViewById(R.id.button_equal);
b_multi = findViewById(R.id.button_multi);
b_divide = findViewById(R.id.button_divide);
b_add = findViewById(R.id.button_add);
b_sub = findViewById(R.id.button_sub);
b_clear = findViewById(R.id.button_clear);
b_dot = findViewById(R.id.button_dot);
b_para1 = findViewById(R.id.button_para1);
b_para2 = findViewById(R.id.button_para2);
t1 = findViewById(R.id.input);
t2 = findViewById(R.id.output);
}

private void operation() {
if (!Double.isNaN(val1)) {
if (t2.getText().toString().charAt(0) == '-') {
val1 = (-1) * val1;
}
val2 = Double.parseDouble(t1.getText().toString());

switch (ACTION) {
case ADDITION:
val1 = val1 + val2;
break;
case SUBTRACTION:
val1 = val1 - val2;
break;
case MULTIPLICATION:
val1 = val1 * val2;
break;
case DIVISION:
val1 = val1 / val2;
break;
case EXTRA:
val1 = (-1) * val1;
break;
case MODULUS:
val1 = val1 % val2;
break;
case EQU:
break;
}
} else {
val1 = Double.parseDouble(t1.getText().toString());
}
}

// Remove error message that is already written there.
private void ifErrorOnOutput() {
if (t2.getText().toString().equals("Error")) {
t2.setText("");
}
}

// Whether value if a double or not
private boolean ifReallyDecimal() {
return val1 == (int) val1;
}

private void noOperation() {
String inputExpression = t2.getText().toString();
if (!inputExpression.isEmpty() && !inputExpression.equals("Error")) {
if (inputExpression.contains("-")) {
inputExpression = inputExpression.replace("-", "");
t2.setText("");
val1 = Double.parseDouble(inputExpression);
}
if (inputExpression.contains("+")) {
inputExpression = inputExpression.replace("+", "");
t2.setText("");
val1 = Double.parseDouble(inputExpression);
}
if (inputExpression.contains("/")) {
inputExpression = inputExpression.replace("/", "");
t2.setText("");
val1 = Double.parseDouble(inputExpression);
}
if (inputExpression.contains("%")) {
inputExpression = inputExpression.replace("%", "");
t2.setText("");
val1 = Double.parseDouble(inputExpression);
}
if (inputExpression.contains("×")) {
inputExpression = inputExpression.replace("×", "");
t2.setText("");
val1 = Double.parseDouble(inputExpression);
}
}
}

// Make text small if too many digits.
private void exceedLength() {
if (t1.getText().toString().length() > 10) {
t1.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
}
}

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