android-jetpack

问题 I've implemented the new PagedListAdapter with an ItemKeyedDataSource. My list contains feed items with a like button. A click on the like button should refresh the item. To refresh my list item on a like button click, i update the state in my Firestore back-end, and call invalidate on my ItemKeyedDataSource. But this will refresh my whole list while jumping back to the top of my list. I wasn't sure if this is normal behaviour, so i went debugging and checking maiby my DiffUtil.ItemCallback

问题 I've implemented the new PagedListAdapter with an ItemKeyedDataSource. My list contains feed items with a like button. A click on the like button should refresh the item. To refresh my list item on a like button click, i update the state in my Firestore back-end, and call invalidate on my ItemKeyedDataSource. But this will refresh my whole list while jumping back to the top of my list. I wasn't sure if this is normal behaviour, so i went debugging and checking maiby my DiffUtil.ItemCallback

问题 I would like to change up button icon in ActionBar that is working with Navigation Component. I've tried several options like: supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_arrow_left_blue_24dp) in MainAcitivty or app:navigationIcon="@drawable/ic_arrow_left_blue_24dp" in Toolbar .xml file and nothing seems to work. I have a pretty standard setup with setSupportActionBar(appToolbar.toolbar) setupActionBarWithNavController(this, navController) called in MainActivity:onCreate method. I

问题 I'm using Android Studio 3.2 Canary 14 and The Navigation Architecture Component. With this you can define transition animations pretty much as you would when using Intents. But the animations are set as properties of the actions in the navigation graph, like so: <fragment android:id="@+id/startScreenFragment" android:name="com.example.startScreen.StartScreenFragment" android:label="fragment_start_screen" tools:layout="@layout/fragment_start_screen" > <action android:id="@+id/action

问题 so previously I had crash with error: You must call setGraph() before calling getGraph() then after reading the solution frem here. it is said that I have to use these lines on my gradle implementation "androidx.navigation:navigation-fragment:2.3.0-alpha02" implementation "androidx.navigation:navigation-ui:2.3.0-alpha02" and the error is dissapear. but now I no longer can find setupWithNavController method. usually I use this line toolbar.setupWithNavController(navController

问题 so previously I had crash with error: You must call setGraph() before calling getGraph() then after reading the solution frem here. it is said that I have to use these lines on my gradle implementation "androidx.navigation:navigation-fragment:2.3.0-alpha02" implementation "androidx.navigation:navigation-ui:2.3.0-alpha02" and the error is dissapear. but now I no longer can find setupWithNavController method. usually I use this line toolbar.setupWithNavController(navController

问题 I am new in MVVM and Android Architecture component. so I have repository like this object RestaurantRepository { val restaurants : LiveData<ArrayList<Restaurant>> = RestaurantClient.restaurants private var count : LiveData<Int> = Transformations.map(restaurants) { Log.d("debugLog","map") it.size } fun searchRestaurants(query: String, latitude:Double, longitude: Double) { mQuery = query RestaurantClient.searchRestaurants( query = query, latitude = latitude, longitude = longitude, start = 0 )

问题 I have tried to read this but my problem is little bit different. I need some different toolbars, so according the documentation from here , I need to set the toolbar in each of my fragment not in my MainActivity. so I set the toolbar in each xml of my fragment. and then in each fragment I use this code to set the toolbar override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) val toolbar = view.findViewById<androidx.appcompat.widget

问题 I have tried to read this but my problem is little bit different. I need some different toolbars, so according the documentation from here , I need to set the toolbar in each of my fragment not in my MainActivity. so I set the toolbar in each xml of my fragment. and then in each fragment I use this code to set the toolbar override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) val toolbar = view.findViewById<androidx.appcompat.widget

问题 I have tried to read this but my problem is little bit different. I need some different toolbars, so according the documentation from here , I need to set the toolbar in each of my fragment not in my MainActivity. so I set the toolbar in each xml of my fragment. and then in each fragment I use this code to set the toolbar override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) val toolbar = view.findViewById<androidx.appcompat.widget