#Convert a number into scientific format
#clcoding
a = '{:.0e}' .format(1111111111111)
b = '{:.0e}' .format(2222222222222)
print(a)
print(b)
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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);
}
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