Retrofit Library WITH OkHTTP - Login

Detail Description :  http://androidnoteblog.blogspot.in/2017/03/retrofit-library-with-okhttp.html



Step - 1 : App dependency to app level gradle.

 compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'
    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup:otto:1.3.8'
    compile 'com.google.code.gson:gson:2.6.2'

Step - 2 :  Add internet permission to AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

Step - 3 : 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"    >
    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical"        android:id="@+id/loginLayout">
        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/usernameInput"            android:hint="Username:"            android:text="admin"            />
        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/passwordInput"            android:hint="Password:"            android:text="admin"            />
        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="horizontal">
            <Button                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:id="@+id/loginButtonPost"                android:text="Login - Post"                android:layout_gravity="right"                android:layout_weight="1" />
            <Button                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:id="@+id/loginButtonGet"                android:text="Login - Get"                android:layout_weight="1" />
        </LinearLayout>
    </LinearLayout>
    <LinearLayout        android:orientation="vertical"        android:layout_width="match_parent"        android:layout_height="fill_parent"        android:layout_below="@id/loginLayout">
        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/information"            android:layout_gravity="center_horizontal"            android:layout_marginTop="20dp" />
        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/extraInformation"            android:layout_gravity="center_horizontal"            android:layout_marginTop="20dp" />    </LinearLayout>
</RelativeLayout>

Step - 4 : MainActivity.java

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.method.PasswordTransformationMethod;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;import com.squareup.otto.Bus;import com.squareup.otto.Subscribe;
public class MainActivity extends AppCompatActivity {

    private Communicator communicator;    private String username, password;    private EditText usernameET, passwordET;    private Button loginButtonPost, loginButtonGet;    private TextView information, extraInformation;    private final static String TAG = "MainActivity";    public static Bus bus;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);
        communicator = new Communicator();
        usernameET = (EditText)findViewById(R.id.usernameInput);        passwordET = (EditText)findViewById(R.id.passwordInput);        //This is used to hide the password's EditText characters. So we can avoid the different hint font.        passwordET.setTransformationMethod(new PasswordTransformationMethod());
        loginButtonPost = (Button)findViewById(R.id.loginButtonPost);        loginButtonPost.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                username = usernameET.getText().toString();                password = passwordET.getText().toString();                usePost(username, password);            }
        });
        loginButtonGet = (Button)findViewById(R.id.loginButtonGet);        loginButtonGet.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                username = usernameET.getText().toString();                password = passwordET.getText().toString();                useGet(username, password);            }
        });
        information = (TextView)findViewById(R.id.information);        extraInformation = (TextView)findViewById(R.id.extraInformation);    }

    private void usePost(String username, String password){
        communicator.loginPost(username, password);    }

    private void useGet(String username, String password){
        communicator.loginGet(username, password);    }

    @Subscribe    public void onServerEvent(ServerEvent serverEvent){
        Toast.makeText(this, ""+serverEvent.getServerResponse().getMessage(), Toast.LENGTH_SHORT).show();        if(serverEvent.getServerResponse().getUsername() != null){
            information.setText("Username: "+serverEvent.getServerResponse().getUsername() + " || Password: "+serverEvent.getServerResponse().getPassword());        }
        extraInformation.setText("" + serverEvent.getServerResponse().getMessage());    }

    @Subscribe    public void onErrorEvent(ErrorEvent errorEvent){
        Toast.makeText(this,""+errorEvent.getErrorMsg(),Toast.LENGTH_SHORT).show();    }

    @Override    public void onResume(){
        super.onResume();        BusProvider.getInstance().register(this);    }

    @Override    public void onPause(){
        super.onPause();        BusProvider.getInstance().unregister(this);    }

}

Step - 5 : BusProvider.java

import com.squareup.otto.Bus;
public class BusProvider {

    private static final Bus BUS = new Bus();
    public static Bus getInstance(){
        return BUS;    }

    public BusProvider(){}
}

Step - 6 :  Communicator.java

import android.util.Log;import okhttp3.OkHttpClient;import okhttp3.logging.HttpLoggingInterceptor;import retrofit2.Call;import retrofit2.Callback;import retrofit2.Response;import retrofit2.Retrofit;import retrofit2.converter.gson.GsonConverterFactory;
public class Communicator {
    private static  final String TAG = "Communicator";    private static final String SERVER_URL = "http://192.168.1.102/retrofit_login/";    //private static final String SERVER_URL = "http://127.0.0.1/retrofit";
    public void loginPost(String username, String password){

        //Here a logging interceptor is created        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();        logging.setLevel(HttpLoggingInterceptor.Level.BODY);
        //The logging interceptor will be added to the http client        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();        httpClient.addInterceptor(logging);
        //The Retrofit builder will have the client attached, in order to get connection logs        Retrofit retrofit = new Retrofit.Builder()
                .client(httpClient.build())
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(SERVER_URL)
                .build(); Interface service = retrofit.create(Interface.class);
        Call<ServerResponse> call = service.post("login",username,password);
        call.enqueue(new Callback<ServerResponse>() {
            @Override            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {
                BusProvider.getInstance().post(new ServerEvent(response.body()));                Log.e(TAG,"Success");            }

            @Override            public void onFailure(Call<ServerResponse> call, Throwable t) {
                // handle execution failures like no internet connectivity                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));            }
        });    }

    public void loginGet(String username, String password){
        //Here a logging interceptor is created        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();        logging.setLevel(HttpLoggingInterceptor.Level.BODY);
        //The logging interceptor will be added to the http client        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();        httpClient.addInterceptor(logging);
        //The Retrofit builder will have the client attached, in order to get connection logs        Retrofit retrofit = new Retrofit.Builder()
                .client(httpClient.build())
                .addConverterFactory(GsonConverterFactory.create())
                .baseUrl(SERVER_URL)
                .build();
        Interface service = retrofit.create(Interface.class);
        Call<ServerResponse> call = service.get("login",username,password);
        call.enqueue(new Callback<ServerResponse>() {
            @Override            public void onResponse(Call<ServerResponse> call, Response<ServerResponse> response) {
                BusProvider.getInstance().post(new ServerEvent(response.body()));                Log.e(TAG,"Success");            }

            @Override            public void onFailure(Call<ServerResponse> call, Throwable t) {
                // handle execution failures like no internet connectivity                BusProvider.getInstance().post(new ErrorEvent(-2,t.getMessage()));            }
        });    }

}

Step - 7 : ErrorEvent.java

public class ErrorEvent {
    private int errorCode;    private String errorMsg;
    public ErrorEvent(int errorCode, String errorMsg) {
        this.errorCode = errorCode;        this.errorMsg = errorMsg;    }

    public int getErrorCode() {
        return errorCode;    }

    public void setErrorCode(int errorCode) {
        this.errorCode = errorCode;    }

    public String getErrorMsg() {
        return errorMsg;    }

    public void setErrorMsg(String errorMsg) {
        this.errorMsg = errorMsg;    }
}

Step - 8 : Create interface ( Interface.interface )

import retrofit2.Call;import retrofit2.http.Field;import retrofit2.http.FormUrlEncoded;import retrofit2.http.GET;import retrofit2.http.POST;import retrofit2.http.Query;
public interface Interface {

    //This method is used for "POST"    @FormUrlEncoded    @POST("http://192.168.1.102/retrofit_login/login_api.php")
    Call<ServerResponse> post(
            @Field("method") String method,            @Field("username") String username,            @Field("password") String password
    );
    //This method is used for "GET"    @GET("http://192.168.1.102/retrofit_login/login_api.php")
    Call<ServerResponse> get(
            @Query("method") String method,            @Query("username") String username,            @Query("password") String password
    );
}

Step - 9 : ServerEvent.java

public class ServerEvent {
    private ServerResponse serverResponse;
    public ServerEvent(ServerResponse serverResponse) {
        this.serverResponse = serverResponse;    }

    public ServerResponse getServerResponse() {
        return serverResponse;    }

    public void setServerResponse(ServerResponse serverResponse) {
        this.serverResponse = serverResponse;    }
}

Step - 10 : ServerResponse.java

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
public class ServerResponse implements Serializable {
        @SerializedName("returned_username")
        private String username;        @SerializedName("returned_password")
        private String password;        @SerializedName("message")
        private String message;        @SerializedName("response_code")
        private int responseCode;
        public ServerResponse(String username, String password, String message, int responseCode){
            this.username = username;            this.password = password;            this.message = message;            this.responseCode = responseCode;        }

        public String getUsername() {
            return username;        }

        public String getPassword() {
            return password;        }

        public String getMessage() {
            return message;        }

    }

Step - 11 :  Save login_api.php in XAMPP/WAMP root directory.

login_api.php,

<?php
        //Post Method here        if(isset($_POST['method']) == 'login'){
        $username = $_POST['username'];        $password = $_POST['password'];
        if($username == "admin" && $password == "admin"){
        $response = array('returned_username' => "-admin-",        'returned_password' => "-admin-",        'message' => "Your credentials are so weak [USING_POST]!",        'response_code' => "1");        echo json_encode($response);
        }else{
        $response = array('response_code' => "-1",        'message' => "invalid username or password");        echo json_encode($response);        }
        }
        //Get Method here        else if(isset($_GET['method']) == 'login'){
        $username = $_GET['username'];        $password = $_GET['password'];
        if($username == "admin" && $password == "admin"){
        $response = array('returned_username' => "=admin=",        'returned_password' => "=admin=",        'message' => "Your credentials are so weak [USING_GET]!",        'response_code' => "1");        echo json_encode($response);        }else{
        $response = array('response_code' => "-1",        'message' => "invalid username or password");        echo json_encode($response);        }
        }

//If no method        else{
        $response = array('response_code' => "-2",        'message' => "invalid method");        echo json_encode($response);        }
        ?>

22

Piccasso Image Download to Storage

Piccasso WebLink : http://square.github.io/picasso/
Help Web -1 : https://code.tutsplus.com/tutorials/android-sdk-working-with-picasso--cms-22149

Step-1 : Add library to App level Gradle

compile 'com.squareup.picasso:picasso:2.5.2'

Step - 2 : Add permission to AndroidManifest.xml

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Step-3 : activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <ImageView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
     />
</LinearLayout>

Step- 4 : MainAcivity.java

import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ImageView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import com.squareup.picasso.Target;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private ImageView mImageView;
    private String mURL = "http://www.allindiaflorist.com/imgs/arrangemen4.jpg";
    private String urls = "http://api.androidhive.info/images/sample.jpg";
    private String[] urlArray = {mURL, urls};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mImageView = (ImageView) findViewById(R.id.image);
    }

    @Override
    protected void onResume() {
        super.onResume();
        Picasso.with(getApplicationContext()).load(mURL).into(mImageView);
        for (int i=0; i<urlArray.length; i++) {
            Picasso.with(getApplicationContext()).load(urlArray[i]).into(target);
        }
    }

    private Target target = new Target() {
        @Override
        public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {

            new Thread(new Runnable() {
                @Override
                public void run() {
                    File folder = new File(MainActivity.this.getExternalFilesDir(null),  "/Picasso/");
                    if (!folder.exists()) {
                        if (!folder.mkdir()) {
                            Log.e("ERROR", "Cannot create a directory!");
                        } else {  folder.mkdir();   }
                    }

                    File[] fileName = {new File(folder, "one.jpg"), new File(folder, "two.jpg")};
                    for (int i=0; i<fileName.length; i++) {
                        if (!fileName[i].exists()) {
                            try {
                                fileName[i].createNewFile();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        } else {
                            try {
                                FileOutputStream outputStream = new FileOutputStream(String.valueOf(fileName[i]));
                                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                                outputStream.close();

                            } catch (FileNotFoundException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }

                }
            }).start();
        }
        @Override
        public void onBitmapFailed(Drawable errorDrawable) {
            Toast.makeText(getApplicationContext(),"Failed", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {

        }
    };



Description :




22.