ListView / ListAdapter mit 2 strings in Android Projekt

http://www.youtube.com/watch?v=wDBM6wVEO70. Listview-Vortrag von Romain guy( android-Entwickler bei google).

Main.xml

<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 Zeile. 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);

}        
   }

Benutzerdefinierte Liste-adapter. Aufblasen benutzerdefiniertes layout für jede Zeile.

 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;

 }
 }

Edit:

Ihre Tätigkeit eine listview. Diese im oncreate setContentView(R. layout.activity_main);. Die Haupt-layout eine listview. Setzen Sie den adapter der listview as listview.setAdapter(youradapter);

Dann listview benutzerdefinierte layout ie row.xml aufgeblasen für jede Zeile Element. Sie eigene adapter für das listview-Steuerelement ist, wo die row.xml aufgeblasen wird. Sie definiert Ihre Klasse CustomAdapter die extends ArrayAdapter. Überschreiben Sie eine Reihe von Methoden.

   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. 

Werden kann, müssen Sie einen viewholder für smooth-scrolling und Leistung. Stellen Sie sich 1000 Zeilen ist lstview mit Bildern kann es zu memory-Ausnahmen. Ein Weg, um loszuwerden, diese ist die Verwertung von Ansichten. Die sichtbaren Ansichten(Zeilen) werden nicht recycelt. Das video in dem link oben hat eine detaillierte Erklärung über das Thema

activity_main.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="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 (layout aufgeblasen für jedes listview-Zeile)

 <?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;
 }  
 }
}