android-recyclerview | 易学教程

Bad performance when use RecyclerView inside NestedScrollView

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问题 I'm developing a search contact feature, in that screen, there is a RecyclerView inside NestedScrolView ( fillViewport = true ). Screen design: ( This design is accepted by customer, I can't change it ) After loading all contacts of current device into an ArrayList, the search results are filtered from this array. There is several cases that make the app very laggy : 1. When user type an input that have no result , then user clear search , I have to show all results again. The

Android: get the exact position on the screen that the user was at in a recyclerview

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I'm going to reference the following question, because this person asked the same thing a month ago but nobody has answered him yet: How to scroll the user at the exact position, which is somewhere between two views.? When the user scrolls somewhere inside a recyclerview list and minimizes the app, then restores it from the bg - or goes into another activity/fragment and returns back to the recyclerview - I want the list to scroll to the exact same location the user was at. When I say the exact location I mean it has to be the exact same location - if I just tell the app to scroll to position

How to programmatically scroll to the bottom of a Recycler View? [duplicate]

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问题 This question already has answers here : How to scroll to the bottom of a RecyclerView? scrollToPosition doesn't work (17 answers) Closed 3 years ago . I want to scroll to the bottom of a recycler view on click of a button, how do I do this? 回答1: You have to make use of LayoutManager for that. Follow the below steps. 1). First of all, declare LayoutManager in your Activity/Fragment . For example, I have taken LinearLayoutManager private LinearLayoutManager mLinearLayoutManager; 2). Initialise

RecyclerView not showing anything

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I have tried to implement the new RecyclerView but it is not showing anything. I have gone through other similar questions and made sure that i am not making the same mistakes. Please help me find what i am missing here. Also let me know if you need any other files. MainActivity public class MainActivity extends ActionBarActivity { private Toolbar toolbar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toolbar = (Toolbar) findViewById(R.id.app_bar); setSupportActionBar(toolbar); getSupportActionBar()

How to pass data collected in arraylist from json asset file in one activity having recyclerview to another activity again having recycler view?

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问题 I have an activity named Cardview Activity which has a recycler view associated with it and i am fetching data from a JSON asset file in that. But now when i click on an item of Cardview Activity, I want to send data related to that item only to another activity i.e. People_List_Activity which is again having a recyclerView. CardViewActivity.java package com.example.android.directory; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget

Floating action button not displaying over recyclerview(which is inside a DrawerLayout)

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问题 I am trying to get FAB over recyclerview which in my case will cover the whole screen. The FAB wont display even recyclerview is empty. Following is my xml code. <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_layout" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" tools:context="com.technistan.ledger.CreateLedger" android:layout_width="match_parent" android:layout

Error inflating class android.support.v7.widget.RecyclerView

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问题 I'm trying to use RecyclerView in my existing project, builds without errors but getting no class found error for the RecyclerView while inflating. Cannot see what I'm doing wrong. Thanks for helping! //activity_main.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="match_parent" android:layout_width="match_parent" android:orientation="vertical"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match

how to implement OnClickListener for custom ViewHolder in my recycler view?

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问题 i am creating an app that is supposed to display bluetooth devices in a recyclerview and i want a user to be able to click the items to perform an action. for now i am just attempting to make a toast appear on click but later i would like to possibly display a dialog giving choices to pair, etc. however i am apperently missing something in my usage of onclicklistener. i am attempting to have my ViewHolder class: DeviceHolder implement View.OnClickListener and placing the call to Toast

one item clickable in RecyclerView in android

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问题 i'm working on some kind of educational game, in this game i represent nine levels in recyclerview each level is enabled when the previous one, now i'm trying to make one item in the recycler View enable and the others unable, i been searching in youtube , and other websites, my question is how to do it?(note: i'm new in android studio so keep it simple as possible). public class ListAdapter extends RecyclerView.Adapter<ListAdapter.ViewHolder> { private List<ItemView> items; private Context

Empty View on a RecyclerView

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In an app I am working on, I am using a Recycler View to show a list of items. I would like the list to display some view (For example, a text view) when the list is empty. I know that with ListViews, one could call setEmptyView , but RecyclerView has no such method. I have tried setting the visibility of a view to GONE, and making it visible when the RecyclerView dataset is empty, but adding any view to the layout file where the RecyclerView is defined leads to an error: Attempt to invoke virtual method 'boolean android.support.v7.widget.RecyclerView$ViewHolder.shouldIgnore()' on a null