http://www.youtube.com/watch?v=wDBM6wVEO70。 ListView由Romain guy(谷歌Android开发人员)发言。
main.xml中
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:focusableInTouchMode="false"
android:listSelector="@android:color/transparent"
android:layout_weight="2"
android:headerDividersEnabled="false"
android:footerDividersEnabled="false"
android:dividerHeight="8dp"
android:divider="#000000"
android:cacheColorHint="#000000"
android:drawSelectorOnTop="false">
</ListView>
</LinearLayout>
Customw行。 row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="#ffffff"
>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:background="@drawable/itembkg"
/>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:text="TextView" />
</LinearLayout>
public class CustomListView extends Activity {
/** Called when the activity is first created. */
ListView lv1;
Customlistadapter cus;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Button b= (Button) findViewById(R.id.remove);
lv1 = (ListView) findViewById(R.id.list);
cus= new Customlistadapter(this);
lv1.setAdapter(cus);
}
}
自定义列表适配器。为每行填充自定义布局。
public class Customlistadapter extends ArrayAdapter {
private LayoutInflater mInflater;
Context c;
public Customlistadapter(CustomListView customListView) {
super(customListView, 0);
// TODO Auto-generated constructor stub
this.mInflater = LayoutInflater.from(customListView);
c=customListView;
}
public int getCount() {
return 20; // number of listview rows.
}
public Object getItem(int arg0) {
return arg0;
}
public long getItemId(int arg0) {
return arg0;
}
public View getView(final int arg0, View arg1, ViewGroup arg2) {
final ViewHolder vh;
vh= new ViewHolder();
if(arg1==null)
{
arg1=mInflater.inflate(R.layout.row, arg2,false);
vh.tv1= (TextView)arg1.findViewById(R.id.textView1);
vh.tv2= (TextView)arg1.findViewById(R.id.textView2);
}
else
{
arg1.setTag(vh);
}
vh.tv1.setText("hello");
vh.tv2.setText("hello");
return arg1;
}
static class ViewHolder //use a viewholder for smooth scrolling and performance.
{
TextView tv1,tv2;
}
}
编辑:
您的活动将有一个列表视图。这在oncreate setContentView(R.layout.activity_main);中设置。主布局将有一个列表视图。您将listview的适配器设置为listview.setAdapter(youradapter);
然后,listview将有自定义布局,即为每个行项目充气的row.xml。您为listview定制的适配器是row.xml充满的地方。您定义了扩展ArrayAdapter的类CustomAdapter。你重写一组方法。
getCount() --- size of listview.
getItem(int position) -- returns the position
getView(int position, View convertView, ViewGroup parent)
// position is the position in the listview.
//convertview - view that is tobe inflated
// you will return the view that is infated.
你将不得不使用一个视图的平滑滚动和性能。想象一下,1000行是与图像一起查看可能会导致内存异常。摆脱这种情况的一种方法是回收视图。可见视图(行)不会被回收。在顶部的链接的视频对主题
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#0095FF">
<ListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:focusableInTouchMode="false"
android:listSelector="@android:color/transparent"
android:layout_weight="2"
android:headerDividersEnabled="false"
android:footerDividersEnabled="false"
android:dividerHeight="8dp"
android:divider="#000000"
android:cacheColorHint="#000000"
android:drawSelectorOnTop="false">
</ListView>
</LinearLayout>
row.xml(布局充气每个列表视图行)详细说明
<?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="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Header" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:layout_gravity="center"
android:text="TextView" />
</LinearLayout>
MainActivity
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView ll = (ListView) findViewById(R.id.list);
CustomAdapter cus = new CustomAdapter();
ll.setAdapter(cus);
}
class CustomAdapter extends BaseAdapter
{
LayoutInflater mInflater;
public CustomAdapter()
{
mInflater = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 30;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder vh;
vh= new ViewHolder();
if(convertView==null)
{
convertView=mInflater.inflate(R.layout.row, parent,false);
vh.tv2= (TextView)convertView.findViewById(R.id.textView2);
vh.tv1= (TextView)convertView.findViewById(R.id.textView2);
}
else
{
convertView.setTag(vh);
}
vh.tv1.setText("my text");
vh.tv2.setText("Postion = "+position);
return convertView;
}
class ViewHolder
{
TextView tv1,tv2;
}
}
}
使用自定义列表适配器 – Raghunandan 2013-04-10 09:04:19
只是一个提示:总是使用英语变量名称。这真是丑陋的“setOpis”,即使它只是训练应用程序,使用英文名称来训练和习惯它。 – Mateusz 2013-04-10 09:31:05
是的。这是丑陋的,但只为我们(波兰人)。无论如何,我仍然在学习Java,阅读代码更加清晰。 – boski 2013-04-10 10:57:53