添加项目和子项到ListView [英] Adding Items and Subitems to a ListView
本文介绍了添加项目和子项到ListView的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个包含下面的XML文件只是一个的ListView
<的RelativeLayout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> < ListView的机器人:ID =@ + ID / LVIEW
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
>< /&的ListView GT;
< / RelativeLayout的>
我想物项和子项添加到该ListView的。
我的应用程序,使某一种根据用户的搜索请求,并得到DATAS,我想取回那些DATAS是在ListView中可见。
有没有简单的方法,如:
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
LV1 =(ListView控件)findViewById(R.id.lview);
lv1.add(项目,分项,0)//其中0是位置..任何像这样的方法?
}
解决方案
如果您想要填充,你必须实现自定义适配器,并在每一行中多个数据项的数组列表中的 getView
方法,像这样:
公共类tasksRepositoryAdapter扩展ArrayAdapter<任务>
{
私人的ArrayList<任务>清单; 公共tasksRepositoryAdapter(上下文的背景下,INT textViewResourceId,列表与LT;任务> tasksRepository)
{
超(背景下,textViewResourceId,tasksRepository);
this.list =新的ArrayList<任务>();
对于(任务任务:tasksRepository)
{
this.list.add(任务);
}
} 公共查看getView(最终诠释的立场,观点convertView,父母的ViewGroup)
{
查看排;
最后ViewHolder持有人=新ViewHolder();
tfRobotoRegular = Typeface.createFromAsset(getAssets(),的Roboto-Regular.ttf); LayoutInflater充气=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
行= inflator.inflate(R.layout.new_row,NULL);
holder.tvTitle =(TextView中)row.findViewById(R.id.text_title);
字符串title = tasksRepository.get(位置).getTitle();
如果(title.length()→25)
{
标题= title.substring(0,24);
标题=标题+...;
}
holder.tvTitle.setText(职称);
holder.tvTitle.setTypeface(tfRobotoRegular);
holder.tvDate =(TextView中)row.findViewById(R.id.text_date);
holder.tvDate.setText(tasksRepository.get(位置).getDate());
holder.tvDate.setTypeface(tfRobotoRegular);
holder.tvTime =(TextView中)row.findViewById(R.id.text_time);
holder.tvTime.setText(tasksRepository.get(位置).getTime());
holder.tvTime.setTypeface(tfRobotoRegular);
holder.tvDescription =(TextView中)row.findViewById(R.id.text_description);
字符串描述= tasksRepository.get(位置).getDescription();
如果(description.length()> 46)
{
描述= description.substring(0,45);
描述=描述+...;
}
holder.tvDescription.setText(介绍);
holder.tvDescription.setTypeface(tfRobotoRegular);
holder.tvId =(TextView中)row.findViewById(R.id.text_id);
holder.tvId.setText(将String.valueOf(tasksRepository.get(位置).getId()));
holder.tvId.setTypeface(tfRobotoRegular);
holder.tvLocation =(TextView中)row.findViewById(R.id.text_location);
holder.tvLocation.setText(tasksRepository.get(位置).getCity());
holder.llRowLayout =(的LinearLayout)row.findViewById(R.id.llRowLayout);
holder.imCalendar =(ImageView的)row.findViewById(R.id.iCalendar);
holder.imClock =(ImageView的)row.findViewById(R.id.iClock);
holder.imLocation =(ImageView的)row.findViewById(R.id.iLocation); holder.imTaskStatusButton =(ImageView的)row.findViewById(R.id.iTaskStatusButton);
holder.imTaskStatusButton.setTag(位置);
holder.imTaskStatusButton.setOnClickListener(新OnClickListener()
{
公共无效的onClick(视图v)
{
INT [] =位置INT新[2];
currentRowId =位置;
currentRow = V;
//获取x,y位置,并将其存储位置[]数组中
//位置[0] = X,位置[1] = Y。
v.getLocationOnScreen(位置); //初始化为x点,和y位置
点=新点();
point.x =位置[0];
point.y =位置[1];
showStatusPopup(TasksListActivity.this,点);
}
});
字符串状态= tasksRepository.get(位置).getStatus();
Log.d(TAG的当前行的状态:+状态);
setStatusColorImages(状态,holder.imClock,holder.imCalendar,holder.imLocation,holder.llRowLayout); 返回行;
}
}
和ViewHolder:
静态类ViewHolder
{
RelativeLayout的rlTitle;
的LinearLayout llRowLayout;
TextView的TVID;
TextView的tvTitle;
TextView的tvDate;
TextView的tvTime;
TextView的tvDescription;
TextView的tvLocation;
ImageView的imClock;
ImageView的imCalendar;
ImageView的imLocation;
ImageView的imTaskStatusButton;
}
在这种情况下
I have the following XML file containing only a ListView
<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="@+id/lview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
></ListView>
</RelativeLayout>
I would like to add Items and Subitems to this ListView.
My app makes a certain kind of search upon the user's request and gets the datas, i want those datas retrieved to be visible in ListView. Is there any simple method like :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv1 = (ListView) findViewById(R.id.lview);
lv1.add(item,subitem,0) // where 0 is the position.. any method like this?
}
解决方案
If you want to populate an array list with many data items in each row you have to implement a custom adapter and a getView
method like so:
public class tasksRepositoryAdapter extends ArrayAdapter<Task>
{
private ArrayList<Task> list;
public tasksRepositoryAdapter(Context context, int textViewResourceId, List<Task> tasksRepository)
{
super(context, textViewResourceId, tasksRepository);
this.list = new ArrayList<Task>();
for (Task task : tasksRepository)
{
this.list.add(task);
}
}
public View getView(final int position, View convertView, ViewGroup parent)
{
View row;
final ViewHolder holder = new ViewHolder();
tfRobotoRegular = Typeface.createFromAsset(getAssets(),"Roboto-Regular.ttf");
LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflator.inflate(R.layout.new_row, null);
holder.tvTitle = (TextView) row.findViewById(R.id.text_title);
String title = tasksRepository.get(position).getTitle();
if (title.length()>25)
{
title = title.substring(0, 24);
title = title + "...";
}
holder.tvTitle.setText(title);
holder.tvTitle.setTypeface(tfRobotoRegular);
holder.tvDate = (TextView) row.findViewById(R.id.text_date);
holder.tvDate.setText(tasksRepository.get(position).getDate());
holder.tvDate.setTypeface(tfRobotoRegular);
holder.tvTime = (TextView) row.findViewById(R.id.text_time);
holder.tvTime.setText(tasksRepository.get(position).getTime());
holder.tvTime.setTypeface(tfRobotoRegular);
holder.tvDescription = (TextView) row.findViewById(R.id.text_description);
String description = tasksRepository.get(position).getDescription();
if (description.length()>46)
{
description = description.substring(0, 45);
description = description + "...";
}
holder.tvDescription.setText(description);
holder.tvDescription.setTypeface(tfRobotoRegular);
holder.tvId = (TextView) row.findViewById(R.id.text_id);
holder.tvId.setText(String.valueOf(tasksRepository.get(position).getId()));
holder.tvId.setTypeface(tfRobotoRegular);
holder.tvLocation = (TextView) row.findViewById(R.id.text_location);
holder.tvLocation.setText(tasksRepository.get(position).getCity());
holder.llRowLayout = (LinearLayout) row.findViewById(R.id.llRowLayout);
holder.imCalendar = (ImageView) row.findViewById(R.id.iCalendar);
holder.imClock = (ImageView) row.findViewById(R.id.iClock);
holder.imLocation = (ImageView) row.findViewById(R.id.iLocation);
holder.imTaskStatusButton = (ImageView) row.findViewById(R.id.iTaskStatusButton);
holder.imTaskStatusButton.setTag(position);
holder.imTaskStatusButton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
int[] location = new int[2];
currentRowId = position;
currentRow = v;
// Get the x, y location and store it in the location[] array
// location[0] = x, location[1] = y.
v.getLocationOnScreen(location);
//Initialize the Point with x, and y positions
point = new Point();
point.x = location[0];
point.y = location[1];
showStatusPopup(TasksListActivity.this, point);
}
});
String status = tasksRepository.get(position).getStatus();
Log.d(TAG, "The status of the current row: "+ status );
setStatusColorImages(status, holder.imClock, holder.imCalendar, holder.imLocation, holder.llRowLayout);
return row;
}
}
and the ViewHolder:
static class ViewHolder
{
RelativeLayout rlTitle;
LinearLayout llRowLayout;
TextView tvId;
TextView tvTitle;
TextView tvDate;
TextView tvTime;
TextView tvDescription;
TextView tvLocation;
ImageView imClock;
ImageView imCalendar;
ImageView imLocation;
ImageView imTaskStatusButton;
}
in this case.
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