baseadapter

Android开发之BaseAdapter的学习

由 前提是你 提交于 2020-02-08 18:54:51
一、目标 学习掌握数据适配器BaseAdaptor的使用，并且练习学会BaseAdaptor的三种使用方式。 二、具体内容 ViewHolder优化BaseAdaptor的方式： （1）创建Bean对象封装数据 （2）在构造方法中初始化用于映射的数据List （3）创建内部ViewHolder类，创建布局映射关系 （4）判断convertView是否为空，为空则创建并设置tag关联viewHolder，不为空则通过tag来取出viewHolder （5）给viewHolder中的控件设置数据 三、源代码 package com.example.baseadapter; import android.os.Bundle; import com.google.android.material.floatingactionbutton.FloatingActionButton; import com.google.android.material.snackbar.Snackbar; import androidx.appcompat.app.AppCompatActivity; import androidx.appcompat.widget.Toolbar; import android.view.View; import android.view.Menu; import

Android nested listview adapter adding only first element

由 无人久伴 提交于 2020-02-06 05:40:46
问题 My purpose is a list in a list like this: -alllist-------- ----row--------- ----row--------- -----(list)----- -------textview -------textview ---row--------- -----(list)---- ..... MainAdapter Class is working fine with other elements but PlaceAdapter is adding only the first (or last, I couldn't figure) item to the 'nested' list. What is the problem? MainAdapter: @Override public View getView(int position, View convertView, ViewGroup parent) { PlaceHolder placeHolder = null; if (convertView =

想到啥写啥第一期：BaseAdapter+GridView

由 隐身守侯 提交于 2020-01-28 09:59:49
想到啥写啥第一期：致力于更简单易懂的代码解决我们安卓小白遇到的问题 知识点就写个BaseAdapter+GridView吧 大概样子就是这个： 来人啊，上代码！ 和listView，simpleAdapter步骤其实差不多 1，UI 2，适配器 3，绑定，完工 UI : ( gridview . xml ) < GridView android : id = "@+id/gridView" android : layout_width = "match_parent" android : layout_height = "wrap_content" android : numColumns = "3" android : verticalSpacing = "40sp" android : horizontalSpacing = "20sp" / > ( griditem . xml ) < LinearLayout xmlns : android = "http://schemas.android.com/apk/res/android" android : orientation = "vertical" android : layout_width = "120sp" android : gravity = "center" android : layout_height =

How to inflate different layout in RecyclerView based on its position in onCreateViewHolder method

由 二次信任 提交于 2020-01-25 07:24:27
问题 I am trying to refactor my ListView to RecyclerView and I stuck in this situation. In my ListView Adapter i have something like this: @Override public int getItemViewType(int position) { if (mDecommissionMode && position == getCount() - 1) return 1; return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (getItemViewType(position) == 0) return getNormalView(position, convertView, parent); else return getManualDecommissionView(convertView, parent); } I

Populating Listview By Passing Multiple ArrayLists Through Custom BaseAdapter

由 喜欢而已 提交于 2020-01-25 01:47:10
问题 Solve the mystery of populating a listview through a custom adapter, which is being passed multiple arraylists as defined below. MAIN ACTIVITY: we declare the arraylists: private static ArrayList<Integer> img_challengeicon_values; static { img_challengeicon_values = new ArrayList<Integer>(); img_challengeicon_values.add(R.drawable.actionbar_hello); img_challengeicon_values.add(R.drawable.actionbar_world); } private static ArrayList<Integer> img_challengerpic_values; static { img_challengerpic

Using Butter Knife in Custom BaseAdapter SubClass Results in “Unable to inject views” error

由 喜欢而已 提交于 2020-01-22 17:06:10
问题 I'm attempting to use Butter Knife to simplify creation of a custom BaseAdapter class. I'm following the example here: http://jakewharton.github.io/butterknife/ under the "Another use is simplifying the view holder pattern inside of a list adapter." section. Unfortunately, I am getting an "Unable to inject views" error each time the ViewHolder is created for each item in the list. Here is my code: public class ButterknifeCustomBaseAdapter extends BaseAdapter{ @Override public int getCount() {

ListView baseadapter class implement TextWatcher

由 孤者浪人 提交于 2020-01-17 09:11:15
问题 i have an baseadapter custom listview and edittext. I want to get data from edittext and change values of all the listview items with text watcher on text change. when i enter a new value text start changing instead of after i finish entering values. im working in fragment. 回答1: You Try this Example and also search in google "listview Filter" you will get so many examples 来源： https://stackoverflow.com/questions/44367930/listview-baseadapter-class-implement-textwatcher

NullPointerException when scrolling fast

由 你离开我真会死。 提交于 2020-01-16 09:04:33
问题 I'm trying to include category fields into my coustom ListView. It works fine until I start scrolling fast. When scrolling very slow this error doesn't occur. It's really confusing me. Could anyone please help? My Code: package com.mamlambo.tutorial.tutlist; import java.util.ArrayList; import java.util.TreeSet; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.app

Prevent ListView Item refresh when adding another Item dynamically using Android

由 六眼飞鱼酱① 提交于 2020-01-16 00:46:11
问题 I am using BaseAdapter to bind Custom ListView . And I am adding Items dynamically. Each Item contains TextView , EditText , Spinner . It is working fine. But now issue is that if user selects any value from Spinner , add some data in EditText and then if he/she adds new item then it clears all values of filled up data. So, I want to prevent this refresh of already added Items when add new Item. How to do this ? My Code : ArrayList<HashMap<String, String>> aaName = new ArrayList<HashMap

Getting force close while scrolling down the list View in Android

由 ♀尐吖头ヾ 提交于 2020-01-11 13:04:12
问题 I am getting force close errors while I try to scroll down my list View in fragment activity, which has 1 image View and 2 text view. I am beginner in android, so don't have that much knowledge except basic scenario in mostly used components of android. No bitmap OOM error is there, as I checked without images too. I am retrieving images from sd card from the path. Here, is my logcat out put with errors. 04-05 18:07:02.868: E/AndroidRuntime(3257): FATAL EXCEPTION: main 04-05 18:07:02.868: E
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