填充从ListArray一个自定义的ListView [英] Populating a custom ListView from ListArray
问题描述
我有以下类:
公共类Person {
公共字符串名称;
公共字符串描述;
公板(字符串名称,字符串描述){
this.name =名称;
this.description =描述;
}
公共字符串的getName()
{
返回this.name;
}
公共字符串getDescription()
{
返回this.description;
}
}
然后我有一个的ArrayList<人>
有一些这方面的数据。
我想要做的就是填充我的ListView什么,我做了什么,我希望它看起来像一个(坏)小样:
在看这个网上的一些信息,我已经做出了新的布局,我已经把中等TextView中,用小的TextView在它之下,但现在我很困惑我怎么可以链接,在与ListView的我MainActivity,然后填充它从我的的ArrayList和其中的数据;人>
首先,你需要自定义布局为您行:
/res/layout/my_row_layout.xml
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直>
<的TextView
机器人:ID =@ + ID / textView_name
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=中文字
机器人:textAppearance =机器人:ATTR / textAppearanceMedium/>
<的TextView
机器人:ID =@ + ID / textView_description
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=TextView的/>
后,您将需要一个ArrayAdapter:
公共类MyListAdapter扩展ArrayAdapter<人> {
私人上下文的背景下;
私人的ArrayList<人> allPersons;
私人LayoutInflater mInflater;
私人布尔mNotifyOnChange = TRUE;
公共MyListAdapter(上下文的背景下,ArrayList的<人> mPersons){
超(背景下,R.layout.my_row_layout);
this.context =背景;
this.allPersons =新的ArrayList<人>(mPersons);
this.mInflater = LayoutInflater.from(上下文);
}
@覆盖
公众诠释getCount将(){
返回allPersons .size();
}
@覆盖
公众人物的getItem(INT位置){
返回allPersons获得(位置);
}
@覆盖
众长getItemId(INT位置){
// TODO自动生成方法存根
返回的位置;
}
@覆盖
公众诠释为getPosition(个人项目){
返回allPersons .indexOf(项目);
}
@覆盖
公众诠释getViewTypeCount(){
返回1; //类型的号码+ 1 !!!!!!!!
}
@覆盖
公众诠释getItemViewType(INT位置){
返回1;
}
@覆盖
公共查看getView(INT位置,查看convertView,ViewGroup中父){
最后ViewHolder持有人;
整型= getItemViewType(位置);
如果(convertView == NULL){
持有人=新ViewHolder();
开关(类型){
情况1:
convertView = mInflater.inflate(R.layout.my_row_layout,父母,假);
holder.name =(TextView中)convertView.findViewById(R.id.textview_name);
holder.description =(TextView中)convertView.findViewById(R.id.textview_description);
打破;
}
convertView.setTag(保持器);
} 其他 {
支架=(ViewHolder)convertView.getTag();
}
holder.name.setText(allPersons.get(位置).getName());
holder.description.setText(allPersons.get(位置).getDescription());
holder.pos =位置;
返回convertView;
}
@覆盖
公共无效notifyDataSetChanged(){
super.notifyDataSetChanged();
mNotifyOnChange =真;
}
公共无效setNotifyOnChange(布尔notifyOnChange){
mNotifyOnChange = notifyOnChange;
}
// ---------------为每一行静态视图----------- //
静态类ViewHolder {
TextView的名称;
TextView的描述;
INT POS机; //存储列表中的项的位置
}
}
在你的活动,你可以这样做:
公共类SecondActivity扩展ListActivity {
私人的ArrayList<人>人;
私人MyListAdapter mAdapter;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
//填写者的数组列表
this.mAdapter =新MyListAdapter(这一点,人);
setListAdapter(mAdapter);
}
}
最后:
/res/layout/activity_main.xml
< RelativeLayout的的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:layout_width =match_parent
机器人:layout_height =match_parent>
<的ListView
机器人:ID =@机器人:ID /列表
机器人:layout_width =match_parent
机器人:layout_height =WRAP_CONTENT
机器人:layout_centerHorizontal =真正的>
< / ListView控件>
注意ListView控件的ID:如果要扩展你的活动作为ListActivity,列表中的ID必须是 @android:ID /列表
我希望这可以帮助您!
I have the following class:
public class Person {
public String name;
public String description;
public Board(String name, String description) {
this.name = name;
this.description = description;
}
public String getName()
{
return this.name;
}
public String getDescription()
{
return this.description;
}
}
I then have an ArrayList<Person>
with some of this data.
What I want to do is populate my ListView, I have made a (bad) mockup of what I want it to look like:
After looking at some information about this online, I have made a new layout where I have put a Medium TextView, with a Small TextView underneath it, but now I am confused to how I can link that in with the ListView on my MainActivity and then populate it with data from my ArrayList<Person>
.
First you need a custom layout for your row:
/res/layout/my_row_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
After, you will need an ArrayAdapter:
public class MyListAdapter extends ArrayAdapter<Person> {
private Context context;
private ArrayList<Person> allPersons;
private LayoutInflater mInflater;
private boolean mNotifyOnChange = true;
public MyListAdapter(Context context, ArrayList<Person> mPersons) {
super(context, R.layout.my_row_layout);
this.context = context;
this.allPersons = new ArrayList<Person>(mPersons);
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return allPersons .size();
}
@Override
public Person getItem(int position) {
return allPersons .get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public int getPosition(Person item) {
return allPersons .indexOf(item);
}
@Override
public int getViewTypeCount() {
return 1; //Number of types + 1 !!!!!!!!
}
@Override
public int getItemViewType(int position) {
return 1;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
int type = getItemViewType(position);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case 1:
convertView = mInflater.inflate(R.layout.my_row_layout,parent, false);
holder.name = (TextView) convertView.findViewById(R.id.textview_name);
holder.description = (TextView) convertView.findViewById(R.id.textview_description);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(allPersons.get(position).getName());
holder.description.setText(allPersons.get(position).getDescription());
holder.pos = position;
return convertView;
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
mNotifyOnChange = true;
}
public void setNotifyOnChange(boolean notifyOnChange) {
mNotifyOnChange = notifyOnChange;
}
//---------------static views for each row-----------//
static class ViewHolder {
TextView name;
TextView description;
int pos; //to store the position of the item within the list
}
}
In your activity, you can do this:
public class SecondActivity extends ListActivity {
private ArrayList<Person> persons;
private MyListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//fill the arraylist of persons
this.mAdapter = new MyListAdapter(this, persons);
setListAdapter(mAdapter);
}
}
Finally:
/res/layout/activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" >
</ListView>
Attention to the id of the ListView: if you are extending your activity as ListActivity, the id of the list must be @android:id/list
.
I hope this help you!
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