Question

嗨，我是Android新手。谁能告诉我请问以下代码是错的：

public class ListApp extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TextView lText = new TextView(this);
        lText.setId(0);       

        ListView lView = new ListView(this);
        String[] lStr = new String[]{"AA","BB", "CC"};
        ArrayAdapter lAdap = new ArrayAdapter(this,lText.getId(),lStr);
        lView.setAdapter(lAdap);
        lView.setFocusableInTouchMode(true);        

        setContentView(lView);
    }
}

Answer 1

这是一个不需要你编写任何xml布局的解决方案。它尽可能使用标准的android布局，不需要通货膨胀：

Dialog dialog = new Dialog(this);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select Color Mode");

ListView modeList = new ListView(this);
String[] stringArray = new String[] { "Bright Mode", "Normal Mode" };
ArrayAdapter<String> modeAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, stringArray);
modeList.setAdapter(modeAdapter);

builder.setView(modeList);
dialog = builder.create();

Answer 2

试试这个..

将以下代码粘贴到list_item.xml中。

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"
    android:padding="10dp" 
    android:textSize="16sp" android:textColor="#ffffff" android:textStyle="bold" android:background="@drawable/border_cell">
</TextView>

这是活动类....

    public class UsersListActivity extends ListActivity{    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);         
            String[] statesList = {"listItem 1", "listItem 2", "listItem 3"};
            setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item,
                    statesList)); 
            ListView lv = getListView(); 

            lv.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {


                     Toast.makeText(getApplicationContext(),
                     "You selected : "+((TextView) view).getText(), Toast.LENGTH_SHORT).show();
     }
            });

        }

}

Answer 3

最佳做法是分离视图（xml布局）和控制器（活动）。

如果你不想要这个，试着把

 setContentView(lView);

在 onCreate

的开头

Answer 4

public class ListApp extends ListActivity

Answer 5

使用listview制作布局XML文件，并在首次将内容视图设置为布局后使用findViewById设置适配器

以编程方式创建ListView

5 个答案: