news database integrated

Author: sijan8s3

app/src/main/java/com/sijanneupane/mvvmnews/repository/NewsRepository.kt

@@ -2,6 +2,8 @@ package com.sijanneupane.mvvmnews.repository
 
 import com.sijanneupane.mvvmnews.api.RetrofitInstance
 import com.sijanneupane.mvvmnews.db.ArticleDatabase
+import com.sijanneupane.mvvmnews.models.Article
+
 /*
 get data from database and from remote data source (retrofit api)
  */
@@ -20,4 +22,22 @@ class NewsRepository(
      */
     suspend fun searchNews(searchQuery: String, pageNumber: Int)=
         RetrofitInstance.api.searchForNews(searchQuery, pageNumber)
+
+    /*
+    function to insert article to db
+     */
+    suspend fun upsert(article: Article)=
+        db.getArticleDao().upsert(article)
+
+    /*
+    function to get saved news from db
+     */
+    fun getSavedNews()=
+        db.getArticleDao().getAllArticles()
+
+    /*
+    function to delete articles from db
+     */
+    suspend fun deleteArticle(article: Article)=
+        db.getArticleDao().deleteArticle(article)
 }

app/src/main/java/com/sijanneupane/mvvmnews/ui/NewsViewModel.kt

@@ -3,6 +3,7 @@ package com.sijanneupane.mvvmnews.ui
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.sijanneupane.mvvmnews.models.Article
 import com.sijanneupane.mvvmnews.models.NewsResponse
 import com.sijanneupane.mvvmnews.repository.NewsRepository
 import com.sijanneupane.mvvmnews.utils.Resource
@@ -69,4 +70,23 @@ class NewsViewModel(
         return Resource.Error(response.message())
     }
 
+    /*
+    function to save articles to db: coroutine
+     */
+    fun saveArticle(article: Article)= viewModelScope.launch {
+        newsRepository.upsert(article)
+    }
+
+    /*
+    function to get all saved news articles
+     */
+    fun getSavedArticle()= newsRepository.getSavedNews()
+
+    /*
+    function to delete article from db
+     */
+    fun deleteSavedArticle(article: Article)= viewModelScope.launch {
+        newsRepository.deleteArticle(article)
+    }
+
 }

app/src/main/java/com/sijanneupane/mvvmnews/ui/fragments/ArticleFragment.kt

@@ -5,6 +5,7 @@ import android.view.View
 import android.webkit.WebViewClient
 import androidx.fragment.app.Fragment
 import androidx.navigation.fragment.navArgs
+import com.google.android.material.snackbar.Snackbar
 import com.sijanneupane.mvvmnews.R
 import com.sijanneupane.mvvmnews.ui.MainActivity
 import com.sijanneupane.mvvmnews.ui.NewsViewModel
@@ -13,7 +14,7 @@ import kotlinx.android.synthetic.main.fragment_article.*
 class ArticleFragment : Fragment(R.layout.fragment_article){
     lateinit var viewModel: NewsViewModel
     //get articles as global element
-    val args: ArticleFragmentArgs by navArgs() //ArticleFragmentArgs is generated by navigation component when we add the args
+    private val args: ArticleFragmentArgs by navArgs() //ArticleFragmentArgs is generated by navigation component when we add the args
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
@@ -26,6 +27,12 @@ class ArticleFragment : Fragment(R.layout.fragment_article){
             loadUrl(article.url)
         }
 
+        //save article
+        fab.setOnClickListener{
+            viewModel.saveArticle(article)
+            Snackbar.make(view, " Article Saved Successfully! ", Snackbar.LENGTH_SHORT).show()
+        }
+
 
     }
 }

app/src/main/java/com/sijanneupane/mvvmnews/ui/fragments/SavedNewsFragment.kt

@@ -1,10 +1,15 @@
 package com.sijanneupane.mvvmnews.ui.fragments
 
+import android.content.ClipData
 import android.os.Bundle
 import android.view.View
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
 import androidx.navigation.fragment.findNavController
+import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.snackbar.Snackbar
 import com.sijanneupane.mvvmnews.R
 import com.sijanneupane.mvvmnews.adapters.NewsAdapter
 import com.sijanneupane.mvvmnews.ui.MainActivity
@@ -37,6 +42,42 @@ class SavedNewsFragment : Fragment(R.layout.fragment_saved_news) {
                 bundle
             )
         }
+
+        //swipe delete variable
+        val itemTouchHelperCallBack = object : ItemTouchHelper.SimpleCallback(
+            ItemTouchHelper.UP or ItemTouchHelper.DOWN, //direction
+            ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT // swipe direction
+        ){
+            override fun onMove(
+                recyclerView: RecyclerView,
+                viewHolder: RecyclerView.ViewHolder,
+                target: RecyclerView.ViewHolder
+            ): Boolean {
+                return true
+            }
+
+            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+                val position= viewHolder.adapterPosition
+                val article= newsAdapter.differ.currentList[position]
+                viewModel.deleteSavedArticle(article)
+                //execute undo Snackbar
+                Snackbar.make(view, " Article Deleted Successfully ", Snackbar.LENGTH_LONG).apply {
+                    setAction("Undo") {
+                        viewModel.saveArticle(article)
+                    }
+                    show()
+                }
+            }
+        }
+        //item touch helper
+        ItemTouchHelper(itemTouchHelperCallBack).apply {
+            attachToRecyclerView(rvSavedNews)
+        }
+
+        //get saved news, observe on changes on out database
+        viewModel.getSavedArticle().observe(viewLifecycleOwner, Observer { articles -> //new list of articles
+            newsAdapter.differ.submitList(articles) //update recyclerview //differ will calculate the difference between lists
+        })
     }
 
     private fun setupRecyclerView(){