added FakeInterceptor sample project

android/FakeInterceptorSample/app/.gitignore

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+/build

android/FakeInterceptorSample/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.2"
+    defaultConfig {
+        applicationId "com.hrupin.fakeinterceptorsample"
+        minSdkVersion 15
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:26.1.0'
+    implementation 'com.android.support:design:26.1.0'
+
+    implementation 'com.squareup.retrofit2:retrofit:2.2.0'
+    implementation 'com.squareup.retrofit2:converter-gson:2.2.0'
+    implementation 'com.squareup.okhttp3:okhttp:3.9.0'
+    implementation 'com.squareup.okhttp3:logging-interceptor:3.4.1'
+}

android/FakeInterceptorSample/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android/FakeInterceptorSample/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hrupin.fakeinterceptorsample">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        android:name=".App">
+        <activity
+            android:name=".LoginActivity"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/FakeInterceptorSample/app/src/main/assets/mockapi/login.json

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+{
+  "id":"uceruc65tfvifbvuyfd67t",
+  "name":"John"
+}

android/FakeInterceptorSample/app/src/main/java/com/hrupin/fakeinterceptorsample/App.java

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+package com.hrupin.fakeinterceptorsample;
+
+import android.app.Application;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 11/11/17.
+ */
+
+public class App extends Application {
+    private static App INSTANCE;
+
+    public static App getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        INSTANCE = this;
+    }
+}

android/FakeInterceptorSample/app/src/main/java/com/hrupin/fakeinterceptorsample/LoginActivity.java

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+package com.hrupin.fakeinterceptorsample;
+
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.text.TextUtils;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.hrupin.fakeinterceptorsample.retrofit.RestClient;
+
+import java.util.HashMap;
+
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+public class LoginActivity extends AppCompatActivity {
+
+    private EditText mEmailView;
+    private EditText mPasswordView;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+        mEmailView = findViewById(R.id.email);
+
+        mPasswordView = findViewById(R.id.password);
+        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
+            @Override
+            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
+                if (id == EditorInfo.IME_ACTION_DONE || id == EditorInfo.IME_NULL) {
+                    attemptLogin();
+                    return true;
+                }
+                return false;
+            }
+        });
+
+        Button mEmailSignInButton = findViewById(R.id.email_sign_in_button);
+        mEmailSignInButton.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                attemptLogin();
+            }
+        });
+    }
+
+    private void attemptLogin() {
+        // Reset errors.
+        mEmailView.setError(null);
+        mPasswordView.setError(null);
+
+        // Store values at the time of the login attempt.
+        String email = mEmailView.getText().toString();
+        String password = mPasswordView.getText().toString();
+
+        boolean cancel = false;
+        View focusView = null;
+
+        // Check for a valid password, if the user entered one.
+        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
+            mPasswordView.setError(getString(R.string.error_invalid_password));
+            focusView = mPasswordView;
+            cancel = true;
+        }
+
+        // Check for a valid email address.
+        if (TextUtils.isEmpty(email)) {
+            mEmailView.setError(getString(R.string.error_field_required));
+            focusView = mEmailView;
+            cancel = true;
+        } else if (!isEmailValid(email)) {
+            mEmailView.setError(getString(R.string.error_invalid_email));
+            focusView = mEmailView;
+            cancel = true;
+        }
+
+        if (cancel) {
+            focusView.requestFocus();
+        } else {
+            HashMap<String, String> map = new HashMap<>();
+            map.put("email", email);
+            map.put("password", password);
+            RestClient.getApiInterface().login(map).enqueue(new Callback<User>() {
+                @Override
+                public void onResponse(Call<User> call, Response<User> response) {
+                    if(response.isSuccessful()){
+                        User user = response.body();
+                        Toast.makeText(LoginActivity.this, "Logged in successful. ID=" + user.id + ", Name=" + user.name, Toast.LENGTH_SHORT).show();
+                    }
+                }
+
+                @Override
+                public void onFailure(Call<User> call, Throwable t) {
+
+                }
+            });
+        }
+    }
+
+    private boolean isEmailValid(String email) {
+        //TODO: Replace this with your own logic
+        return email.contains("@");
+    }
+
+    private boolean isPasswordValid(String password) {
+        //TODO: Replace this with your own logic
+        return password.length() > 4;
+    }
+}
+

android/FakeInterceptorSample/app/src/main/java/com/hrupin/fakeinterceptorsample/User.java

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+package com.hrupin.fakeinterceptorsample;
+
+/**
+ * Created by Igor Khrupin www.hrupin.com on 11/11/17.
+ */
+
+public class User {
+    public String id;
+    public String name;
+}

android/FakeInterceptorSample/app/src/main/java/com/hrupin/fakeinterceptorsample/retrofit/ApiInterface.java

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+package com.hrupin.fakeinterceptorsample.retrofit;
+
+
+import com.hrupin.fakeinterceptorsample.User;
+
+import java.util.HashMap;
+
+import retrofit2.Call;
+import retrofit2.http.Body;
+import retrofit2.http.Headers;
+import retrofit2.http.POST;
+
+/**
+ * ServerInterface
+ */
+public interface ApiInterface {
+
+    @Headers({
+            "Accept: application/json",
+            "Content-Type: application/json"
+    })
+    @POST("login")
+    Call<User> login(@Body HashMap<String, String> body);
+
+}

android/FakeInterceptorSample/app/src/main/java/com/hrupin/fakeinterceptorsample/retrofit/FakeInterceptor.java

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+package com.hrupin.fakeinterceptorsample.retrofit;
+
+import android.content.Context;
+import android.util.Log;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+
+import okhttp3.Interceptor;
+import okhttp3.MediaType;
+import okhttp3.Protocol;
+import okhttp3.Request;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+import okio.Buffer;
+
+/**
+ *
+ */
+public class FakeInterceptor implements Interceptor {
+    private static final String TAG = FakeInterceptor.class.getSimpleName();
+    private static final String FILE_EXTENSION = ".json";
+    private Context mContext;
+
+    private String mContentType = "application/json";
+
+    public FakeInterceptor(Context context) {
+        mContext = context;
+    }
+
+    /**
+     * Set content type for header
+     *
+     * @param contentType Content type
+     * @return FakeInterceptor
+     */
+    public FakeInterceptor setContentType(String contentType) {
+        mContentType = contentType;
+        return this;
+    }
+
+    @Override
+    public Response intercept(Chain chain) throws IOException {
+        List<String> listSuggestionFileName = new ArrayList<>();
+        String method = chain.request().method().toLowerCase();
+
+        Response response = null;
+        // Get Request URI.
+        final URI uri = chain.request().url().uri();
+        Log.d(TAG, "--> Request url: [" + method.toUpperCase() + "]" + uri.toString());
+
+        String defaultFileName = getFileName(chain);
+
+        if (defaultFileName != null) {
+            String fileName = getFilePath(uri, defaultFileName);
+            Log.d(TAG, "Read data from file: " + fileName);
+            try {
+                InputStream is = mContext.getAssets().open(fileName);
+                BufferedReader r = new BufferedReader(new InputStreamReader(is));
+                StringBuilder responseStringBuilder = new StringBuilder();
+                String line;
+                while ((line = r.readLine()) != null) {
+                    responseStringBuilder.append(line).append('\n');
+                }
+                Log.d(TAG, "Response: " + responseStringBuilder.toString());
+                Response.Builder builder = new Response.Builder();
+                builder.request(chain.request());
+                builder.protocol(Protocol.HTTP_1_0);
+                builder.addHeader("content-type", mContentType);
+
+                builder.body(ResponseBody.create(MediaType.parse(mContentType), responseStringBuilder.toString().getBytes()));
+                builder.code(200);
+                builder.message(responseStringBuilder.toString());
+
+                response = builder.build();
+            } catch (IOException e) {
+                Log.e(TAG, e.getMessage(), e);
+            }
+        } else {
+            for (String file : listSuggestionFileName) {
+                Log.e(TAG, "File not exist: " + getFilePath(uri, file));
+            }
+            response = chain.proceed(chain.request());
+        }
+
+        Log.d(TAG, "<-- END [" + method.toUpperCase() + "]" + uri.toString());
+        return response;
+    }
+
+    private String getFileName(Chain chain) {
+
+        String method = chain.request().method();
+        if (method.equals("POST")) {
+            String fileName = null;
+            String lastSegment = chain.request().url().pathSegments().get(chain.request().url().pathSegments().size() - 1);
+
+            if (lastSegment.equals("login")) {
+                fileName = "login";
+            } else {
+                fileName = lastSegment;
+            }
+
+            return fileName + FILE_EXTENSION;
+        }
+        return "none" + FILE_EXTENSION;
+    }
+
+    private String getFilePath(URI uri, String fileName) {
+        String path;
+        if (uri.getPath().lastIndexOf('/') != uri.getPath().length() - 1) {
+            path = uri.getPath().substring(0, uri.getPath().lastIndexOf('/') + 1);
+        } else {
+            path = uri.getPath();
+        }
+        return uri.getHost() + path + fileName;
+    }
+}