android应用开发全程实录-你有多熟悉listview

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<!-- 添加一个ListView控件 -->
<ListView
    android:id="@+id/lv"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>            
</LinearLayout>

publicclass MyListView extends Activity {
    
privatestaticfinal String[] strs = new String[] {
    "first", "second", "third", "fourth", "fifth"
    };//定义一个String数组用来显示ListView的内容private ListView lv;

/** Called when the activity is first created. */
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);//得到ListView对象的引用
/*为ListView设置Adapter来绑定数据*/
lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, strs));

    }
}

lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_checked, strs));
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

lv.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, strs));
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

lv.setAdapter(newArrayAdapter<String>(this,

android.R.layout.simple_list_item_single_choice,strs));

lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                    //点击后在标题上显示点击了第几行                    setTitle("你点击了第"+arg2+"行");
            }
        });

<?xmlversion="1.0"encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
<ImageView
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ItemImage"/>
<TextView
android:id="@+id/ItemTitle"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:textSize="20sp"/>
<TextView
android:id="@+id/ItemText"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_below="@+id/ItemTitle"/>
</RelativeLayout>

publicclass MyListViewSimple extends Activity {
    
    private ListView lv;
    
/** Called when the activity is first created. */
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);
/*定义一个动态数组*/
          ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,     Object>>();
/*在数组中存放数据*/
for(int i=0;i<10;i++)  
        {  
            HashMap<String, Object> map = new HashMap<String, Object>();  
            map.put("ItemImage", R.drawable.icon);//加入图片            map.put("ItemTitle", "第"+i+"行");  
            map.put("ItemText", "这是第"+i+"行");  
            listItem.add(map);  
        } 

        SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,//需要绑定的数据                R.layout.item,//每一行的布局
//动态数组中的数据源的键对应到定义布局的View中new String[] {"ItemImage","ItemTitle", "ItemText"},   
newint[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText}  
            );

lv.setAdapter(mSimpleAdapter);//为ListView绑定适配器
lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                setTitle("你点击了第"+arg2+"行");//设置标题栏显示点击的行                
            }
        });
    }
}

publicclass MyListViewBase extends Activity {
    
    private ListView lv;
    /*定义一个动态数组*/
    ArrayList<HashMap<String, Object>>listItem;


/** Called when the activity is first created. */
@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);
        MyAdapter mAdapter = new MyAdapter(this);//得到一个MyAdapter对象lv.setAdapter(mAdapter);//为ListView绑定Adapter
/*为ListView添加点击事件*/
lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
        Log.v("MyListViewBase", "你点击了ListView条目" + arg2);//在LogCat中输出信息                
            }
        });

    }
/*添加一个得到数据的方法，方便使用*/
private ArrayList<HashMap<String, Object>> getDate(){
    
    ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,     Object>>();
    /*为动态数组添加数据*/
    for(int i=0;i<30;i++)  
         {  
             HashMap<String, Object> map = new HashMap<String, Object>();  
             map.put("ItemTitle", "第"+i+"行");  
             map.put("ItemText", "这是第"+i+"行");  
             listItem.add(map);  
         } 
        return listItem;
    
    }
/*
     * 新建一个类继承BaseAdapter，实现视图与数据的绑定
     */
privateclass MyAdapter extends BaseAdapter {
    
private LayoutInflater mInflater;//得到一个LayoutInfalter对象用来导入布局
/*构造函数*/
public MyAdapter(Context context) {
    this.mInflater = LayoutInflater.from(context);
        }

        @Override
        publicint getCount() {
            
            return getDate().size();//返回数组的长度        }

        @Override
        public Object getItem(int position) {
            returnnull;
        }

        @Override
        publiclong getItemId(int position) {
            return 0;
        }
        /*书中详细解释该方法*/
        @Override
        public View getView(finalint position, View convertView, ViewGroup parent) {
             ViewHolder holder;
            //观察convertView随ListView滚动情况             Log.v("MyListViewBase", "getView " + position + " " + convertView);
            if (convertView == null) {
                     convertView = mInflater.inflate(R.layout.item,
    null);
                     holder = new ViewHolder();
                    /*得到各个控件的对象*/
                    holder.title = (TextView) convertView.findViewById(R.id.ItemTitle);
                    holder.text = (TextView) convertView.findViewById(R.id.ItemText);
                    holder.bt = (Button) convertView.findViewById(R.id.ItemButton);
                    convertView.setTag(holder);//绑定ViewHolder对象                   }
    else{
                    holder = (ViewHolder)convertView.getTag();//取出ViewHolder对象                  }
            /*设置TextView显示的内容，即我们存放在动态数组中的数据*/
            holder.title.setText(getDate().get(position).get("ItemTitle").toString());
            holder.text.setText(getDate().get(position).get("ItemText").toString());
            
            /*为Button添加点击事件*/
             holder.bt.setOnClickListener(new OnClickListener() {
                
                @Override
                publicvoid onClick(View v) {
                Log.v("MyListViewBase", "你点击了按钮" + position);                                //打印Button的点击信息                    
                }
            });
            
            return convertView;
        }
    
    }
/*存放控件*/
publicfinalclass ViewHolder{
    public TextView title;
    public TextView text;
    public Button   bt;
    }
}