android学习笔记——利用BaseAdapter生成40个列表项

浏览数：29 / 时间：2015年06月11日

RT；

main.xml

<?xml version="1.0" 
encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
        >
    <ListView
            android:id="@+id/myList"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            />
</LinearLayout>

MyActivity.java

public class MyActivity extends 
Activity {
    /**
     * Called when the activity is first created.
     */
 
    ListView myList;
    public 
void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myList=(ListView)findViewById(R.id.myList);
        BaseAdapter adapter =new 
BaseAdapter() {
            @Override
            public 
int getCount() {
                //指定一共包含40个选项
                return 
40;
            }
 
            @Override
            public 
Object getItem(int 
i) {
                return 
null;  //To change body of implemented methods use File | Settings | File Templates.
            }
//重写该方法，该方法的返回值将作为列表项的ID
            @Override
            public 
long getItemId(int 
i) {
                return 
i;  //To change body of implemented methods use File | Settings | File Templates.
            }
 
            @Override
            public 
View getView(int 
i, View view, ViewGroup viewGroup) {
          //创建一个LinerarLayout，并向其中添加两个组件
                LinearLayout line=new 
LinearLayout(MyActivity.this);
                line.setOrientation(0);
                ImageView image=new 
ImageView(MyActivity.this);
                image.setImageResource(R.drawable.ic_launcher);
                TextView text=new 
TextView(MyActivity.this);
                text.setText("第"+(i+1)+"个列表项");
                text.setTextSize(20);
                text.setTextColor(Color.RED);
                line.addView(image);
                line.addView(text);
                //返回LinearLayout实例
                return 
line;
            }
        };
        myList.setAdapter(adapter);
    }
}