来自Handler的Android setContentView？

我使用下面的代码填充screen.But它给运行异常。如何解决这个问题？来自Handler的Android setContentView？

java.lang.IllegalStateException：滚动型只能承载一个直接子

我的代码是：

public class MyClass extends Activity { 

ArrayList ALobj; 
Handler myHandler; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
context = this; 
ALobj=new ArrayList(); 
ALobj.add(...); 

myHandler = new Handler() { 
@Override 
public void handleMessage(Message msg) { 
    super.handleMessage(msg); 
    ALobj.add(....); 
    populate_screen(ALobj); 
} 
} 

    populate_screen(ArrayList ALobj); 

} 

private void populate_screen(ArrayList obj){ 

ScrollView scrl=new ScrollView(context); 

    LinearLayout llay=new LinearLayout(context); 
........ 
.......... 
............ 

    scrl.addView(llay); 
setContentView(scrl); 
} 

..... 
.......... 
............. 
@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

switch (item.getItemId()) { 
case 1: 
Message msg = new Message(); 
myHandler.sendMessage(msg); 
break; 
} 
return super.onOptionsItemSelected(item); 
} 
}

来源

2011-08-25 Karthick Ramu