Chapter2

app/src/main/AndroidManifest.xml

@@ -5,12 +5,16 @@
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application
+        android:name=".App"
         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/Theme.MVVM2">
+        <activity
+            android:name=".ui.history.HistoryActivity"
+            android:exported="true" />
         <activity
             android:name=".ui.moive.MovieActivity"
             android:exported="true" />

app/src/main/java/com/example/mvvm2/App.kt

@@ -0,0 +1,16 @@
+package com.example.mvvm2
+
+import android.app.Application
+import android.content.SharedPreferences
+import com.example.mvvm2.data.repository.local.SharedPreference
+
+class App: Application() {
+    override fun onCreate() {
+        super.onCreate()
+        instance = this
+    }
+
+    companion object {
+        lateinit var instance: App
+    }
+}

app/src/main/java/com/example/mvvm2/data/repository/Repository.kt

@@ -0,0 +1,35 @@
+package com.example.mvvm2.data.repository
+
+import com.example.mvvm2.data.model.MovieResponse
+import com.example.mvvm2.data.repository.local.LocalDataSource
+import com.example.mvvm2.data.repository.local.LocalDataSourceImpl
+import com.example.mvvm2.data.repository.remote.RemoteDataSourceImpl
+import retrofit2.Call
+
+interface Repository {
+    val remoteDataSource: RemoteDataSourceImpl
+    val localDataSource: LocalDataSourceImpl
+
+    fun getMovieList(query: String): Call<MovieResponse>
+    fun getHistory(): ArrayList<String>?
+    fun setHistory(title:String)
+}
+
+class RepositoryImpl() : Repository {
+    override val remoteDataSource: RemoteDataSourceImpl
+        get() = RemoteDataSourceImpl()
+    override val localDataSource: LocalDataSourceImpl
+        get() = LocalDataSourceImpl()
+
+    override fun getMovieList(query: String): Call<MovieResponse> {
+        return remoteDataSource.getMovieList(query)
+    }
+
+    override fun getHistory(): ArrayList<String>? {
+        return localDataSource.getHistory()
+    }
+
+    override fun setHistory(title: String) {
+        return localDataSource.setHistory(title)
+    }
+}

app/src/main/java/com/example/mvvm2/data/repository/local/LocalDataSource.kt

@@ -0,0 +1,21 @@
+package com.example.mvvm2.data.repository.local
+
+import com.example.mvvm2.App
+
+interface LocalDataSource {
+    val pref: SharedPreference
+        get() = SharedPreference(App.instance.applicationContext)
+
+    fun getHistory(): ArrayList<String>?
+    fun setHistory(title:String)
+}
+
+class LocalDataSourceImpl():LocalDataSource{
+    override fun getHistory(): ArrayList<String>? {
+        return pref.getHistory()
+    }
+
+    override fun setHistory(title: String) {
+        pref.setHistory(title)
+    }
+}

app/src/main/java/com/example/mvvm2/data/repository/local/SharedPreference.kt

@@ -0,0 +1,32 @@
+package com.example.mvvm2.data.repository.local
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.util.Log
+import com.example.mvvm2.App
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+
+class SharedPreference(context: Context) {
+    private val PREF_NAME = "PREF"
+    private val PREF_MODE = Context.MODE_PRIVATE
+    private var pref: SharedPreferences = context.getSharedPreferences(PREF_NAME, PREF_MODE)
+
+
+    private val HISTORY = "HISTORY"
+    fun getHistory(): ArrayList<String>? {
+        val history = pref.getString(HISTORY, null)
+        return Gson().fromJson(history, object : TypeToken<ArrayList<String>>() {}.type)
+    }
+
+    fun setHistory(h: String) {
+        var history: ArrayList<String>? = if (getHistory().isNullOrEmpty()) arrayListOf() else getHistory()
+        history!!.add(h)
+        history = history.distinct() as ArrayList<String>
+
+        if (history.size == 6) {
+            history.removeAt(0)
+        }
+        pref.edit().putString(HISTORY, Gson().toJson(history)).apply()
+    }
+}

app/src/main/java/com/example/mvvm2/data/repository/BaseRetrofit.kt → app/src/main/java/com/example/mvvm2/data/repository/remote/BaseRetrofit.kt

@@ -1,4 +1,4 @@
-package com.example.mvvm2.data.repository
+package com.example.mvvm2.data.repository.remote
 
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory

app/src/main/java/com/example/mvvm2/data/repository/MovieRetrofit.kt → app/src/main/java/com/example/mvvm2/data/repository/remote/MovieRetrofit.kt

@@ -1,4 +1,4 @@
-package com.example.mvvm2.data.repository
+package com.example.mvvm2.data.repository.remote
 
 import com.example.mvvm2.data.model.MovieResponse
 import retrofit2.Call

app/src/main/java/com/example/mvvm2/data/repository/remote/RemoteDataSource.kt

@@ -0,0 +1,15 @@
+package com.example.mvvm2.data.repository.remote
+
+import com.example.mvvm2.data.model.MovieResponse
+import retrofit2.Call
+
+interface RemoteDataSource {
+    fun getMovieList(query: String):Call<MovieResponse>
+}
+
+class RemoteDataSourceImpl() : RemoteDataSource {
+
+    override fun getMovieList(query: String): Call<MovieResponse> {
+        return BaseRetrofit.retrofit.create(MovieRetrofit::class.java).getMovieList(query)
+    }
+}

app/src/main/java/com/example/mvvm2/ui/history/HistoryActivity.kt

@@ -0,0 +1,42 @@
+package com.example.mvvm2.ui.history
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import androidx.databinding.DataBindingUtil
+import androidx.lifecycle.ViewModelProvider
+import com.example.mvvm2.R
+import com.example.mvvm2.databinding.ActivityHistoryBinding
+import com.example.mvvm2.databinding.ActivityMainBinding
+import com.example.mvvm2.ui.main.MainActivity
+import com.example.mvvm2.ui.main.MainRecyclerAdapter
+import com.example.mvvm2.ui.main.MainViewModel
+import com.example.mvvm2.ui.moive.MovieActivity
+
+class HistoryActivity : AppCompatActivity() {
+    private lateinit var  vm:HistoryViewModel
+    private lateinit var binding: ActivityHistoryBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        //viewmodel
+        vm = ViewModelProvider(
+            this,
+            ViewModelProvider.NewInstanceFactory()
+        )[HistoryViewModel::class.java]
+        vm.getHistory()
+
+        //binding
+        binding = DataBindingUtil.setContentView(this, R.layout.activity_history)
+        binding.vm = vm
+        binding.lifecycleOwner = this
+        binding.historyRecycler.adapter = HistoryRecyclerAdapter(){
+            val mainIntent = Intent(this, MainActivity::class.java).apply {
+                putExtra("title", it)
+            }
+            startActivity(mainIntent)
+        }
+
+    }
+}

app/src/main/java/com/example/mvvm2/ui/history/HistoryRecyclerAdapter.kt

@@ -0,0 +1,40 @@
+package com.example.mvvm2.ui.history
+
+import android.annotation.SuppressLint
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.example.mvvm2.databinding.ItemHistoryBinding
+
+class HistoryRecyclerAdapter(val historyClickListener: (String) -> Unit) :
+    RecyclerView.Adapter<HistoryRecyclerAdapter.ViewHolder>() {
+
+    private val histories:ArrayList<String> = arrayListOf()
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HistoryRecyclerAdapter.ViewHolder {
+        val binding = ItemHistoryBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: HistoryRecyclerAdapter.ViewHolder, position: Int) {
+        holder.bind(histories[position])
+        holder.itemView.setOnClickListener { historyClickListener(histories[position])}
+    }
+
+    override fun getItemCount(): Int = histories.size
+
+    @SuppressLint("NotifyDataSetChanged")
+    fun setItem(histories: ArrayList<String>) {
+        this.histories.clear()
+        this.histories.addAll(histories)
+        notifyDataSetChanged()
+    }
+
+    class ViewHolder(private val binding:ItemHistoryBinding):RecyclerView.ViewHolder(binding.root){
+        fun bind(history:String) {
+            binding.history = history
+        }
+    }
+
+}

app/src/main/java/com/example/mvvm2/ui/history/HistoryViewModel.kt

@@ -0,0 +1,15 @@
+package com.example.mvvm2.ui.history
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import com.example.mvvm2.data.repository.RepositoryImpl
+
+class HistoryViewModel:ViewModel() {
+    val repository:RepositoryImpl = RepositoryImpl()
+
+    val historyList: MutableLiveData<ArrayList<String>?> = MutableLiveData()
+
+    fun getHistory () {
+        historyList.value = repository.getHistory()
+    }
+}

app/src/main/java/com/example/mvvm2/ui/main/MainActivity.kt

@@ -7,6 +7,7 @@ import androidx.databinding.DataBindingUtil
 import androidx.lifecycle.ViewModelProvider
 import com.example.mvvm2.R
 import com.example.mvvm2.databinding.ActivityMainBinding
+import com.example.mvvm2.ui.history.HistoryActivity
 import com.example.mvvm2.ui.moive.MovieActivity
 import javax.security.auth.callback.Callback
 import kotlin.math.log
@@ -26,6 +27,12 @@ class MainActivity : AppCompatActivity() {
             ViewModelProvider.NewInstanceFactory()
         )[MainViewModel::class.java]
 
+
+        if (intent.getStringExtra("title") != null) {
+            vm.query = intent.getStringExtra("title").toString()
+            vm.getMoveList()
+        }
+
         // binding
         binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
         binding.vm = vm
@@ -36,5 +43,11 @@ class MainActivity : AppCompatActivity() {
             }
             startActivity(movieIntent)
         }
+
+        //History button clickListener
+        binding.mainHistoryBtn.setOnClickListener{
+            val historyIntent = Intent(this, HistoryActivity::class.java)
+            startActivity(historyIntent)
+        }
     }
 }

app/src/main/java/com/example/mvvm2/ui/main/MainBindingAdapter.kt

@@ -1,13 +1,27 @@
 package com.example.mvvm2.ui.main
 
 import android.util.Log
+import android.view.View
 import android.widget.ImageView
+import android.widget.TextView
 import androidx.databinding.BindingAdapter
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.bumptech.glide.Glide
 import com.example.mvvm2.R
 import com.example.mvvm2.data.model.Movie
+import com.example.mvvm2.ui.history.HistoryRecyclerAdapter
+import org.w3c.dom.Text
+
+@BindingAdapter("bind_visible_if")
+fun setVisibility(textView:TextView, empty:Boolean) {
+    if (empty) {
+        textView.visibility = View.VISIBLE
+    }
+    else {
+        textView.visibility = View.GONE
+    }
+}
 
 @BindingAdapter("bind_movie_list")
 fun setMovie(recyclerView: RecyclerView, movies:ArrayList<Movie>?){
@@ -23,4 +37,11 @@ fun setImage(imageView: ImageView, url:String) {
         .load(url)
         .error(R.drawable.ic_launcher_foreground)
         .into(imageView)
+}
+
+@BindingAdapter("bind_history_list")
+fun setHistory(recyclerView: RecyclerView, histories: ArrayList<String>?) {
+    if (histories != null) {
+        (recyclerView.adapter as HistoryRecyclerAdapter).setItem(histories)
+    }
 }

app/src/main/java/com/example/mvvm2/ui/main/MainRecyclerAdapter.kt

@@ -8,8 +8,10 @@ import com.example.mvvm2.data.model.Movie
 import com.example.mvvm2.databinding.ItemMainBinding
 import com.example.mvvm2.ui.moive.MovieActivity
 
-class MainRecyclerAdapter ( val movieClickListener: (Movie)->Unit) : RecyclerView.Adapter<MainRecyclerAdapter.ViewHolder>() {
-    var movies:ArrayList<Movie> = arrayListOf()
+class MainRecyclerAdapter(val movieClickListener: (Movie) -> Unit) :
+    RecyclerView.Adapter<MainRecyclerAdapter.ViewHolder>() {
+
+    var movies: ArrayList<Movie> = arrayListOf()
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
         val binding = ItemMainBinding.inflate(LayoutInflater.from(parent.context), parent, false)
@@ -18,24 +20,23 @@ class MainRecyclerAdapter ( val movieClickListener: (Movie)->Unit) : RecyclerVie
 
     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
         holder.bind(movies[position])
-        holder.itemView.setOnClickListener{movieClickListener(movies[position])}
+        holder.itemView.setOnClickListener { movieClickListener(movies[position]) }
     }
 
     override fun getItemCount(): Int {
         return movies.size
     }
 
-    fun setItem(movies : ArrayList<Movie>) {
+    fun setItem(movies: ArrayList<Movie>) {
         this.movies.clear()
         this.movies.addAll(movies)
         notifyDataSetChanged()
     }
 
-    class ViewHolder(private val binding: ItemMainBinding) :RecyclerView.ViewHolder(binding.root) {
-        fun bind (movie:Movie) {
+    class ViewHolder(private val binding: ItemMainBinding) : RecyclerView.ViewHolder(binding.root) {
+        fun bind(movie: Movie) {
             binding.movie = movie
         }
-
     }
 
 }