android ListView 和 BaseAdapter 應用，androidbaseadapter

android ListView 和 BaseAdapter 應用，androidbaseadapter

步聚：

1.建立ListView對象；--（作用：綁定Adapter呈現資料）

2.建立ListView實現的Item欄位.xml布局；--（作用：實現ListView的欄位布局）

3.建立Item.xml 的View資料執行個體（類）；--（作用：實現Item欄位元據介面）

4.繼承BaseAdapter建立MyAdapter類class；--（作用：封裝ListView的.xml布局與Item資料）

5.當然還要作更多的操作，這裡例出簡潔的方法；

adapter實現：

  1     private class UpdateAdpter extends BaseAdapter {  2   3         private LayoutInflater mInflater;  4         private List<ItemData> mItemsData;  5   6         public UpdateAdpter(Context context, List<ItemData> listItemData) {  7             this.mInflater = LayoutInflater.from(context);  8             this.mItemsData = listItemData;  9  10         } 11  12         @Override 13         public int getCount() { 14             // TODO Auto-generated method stub 15             return mItemsData.size(); 16         } 17  18         @Override 19         public Object getItem(int position) { 20             // TODO Auto-generated method stub 21             return mItemsData.get(position); 22         } 23  24         @Override 25         public long getItemId(int position) { 26             // TODO Auto-generated method stub 27             return position; 28         } 29  30         @Override 31         public View getView(final int position, View convertView, 32                 ViewGroup parent) { 33             // TODO Auto-generated method stub 34             ViewHolder holder; 35             if (convertView == null) { 36                 convertView = mInflater.inflate( 37                         R.layout.activity_account_update_listview_item, null); 38                 holder = new ViewHolder(convertView); 39                 convertView.setTag(holder); 40  41             } else { 42                 holder = (ViewHolder) convertView.getTag(); 43             } 44             ItemData item = mItemsData.get(position); 45             holder.title.setText(item.getTitle()); 46             holder.price.setText(item.getPrice()); 47             holder.text.setText(item.getBuyText()); 48             holder.status.setText(item.getStatus()); 49  50             return convertView; 51         } 52  53         public class ViewHolder { 54             public TextView title; 55             public TextView price; 56             public TextView buytext; 57             public TextView status; 58  59             ViewHolder(View view) { 60                 title = (TextView) view 61                         .findViewById(R.id.tv_accountupdateitem_title); 62                 price = (TextView) view 63                         .findViewById(R.id.tv_accountupdateitem_price); 64                 text = (TextView) view 65                         .findViewById(R.id.tv_accountupdateitem_buytext); 66                 status = (TextView) view.findViewById(R.id.tv_accountupdate_status); 67             } 68         } 69     } 70  71     private class ItemData { 72         private String title;//標題 73         private String price;//價格 74         private String text;//內容 75         private String status;//狀態 76  77         public void setTitle(String value) { 78             title = value; 79         } 80  81         public String getTitle() { 82             return title; 83         } 84  85         public void setPrice(String value) { 86             price = value; 87         } 88  89         public String getPrice() { 90             return price; 91         } 92  93         public void setText(String value) { 94             buytext = value; 95         } 96  97         public String getText() { 98             return buytext; 99         }100         101         public void setStatus(String value) {102             status = value;103         }104 105         public String getStatus() {106             return status;107         }        108     }

activity調有執行個體：

public class UpdateActivity extends Activity implements OnClickListener{private ListView UpdateLView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_account_update);        iniView();                   }    public void iniView() {       UpdateLView = (ListView) findViewById(R.id.account_update_listView);        iniListViewDataUpdate();//初始listview資料    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub    }    private void iniListViewDataUpdate(){        ItemData itemData;        List<ItemData> listItemData = new ArrayList<ItemData>();                for (int i=0;i<2;i++){            itemData=  new ItemData();            itemData.setTitle("title");            itemData.setPrice("price");            itemData.setText("text");            itemData.setStatus("status");                        listItemData.add(itemData);        }        nowUpdateLView.setAdapter(new UpdateAdpter(this,listItemData));     }

item.xml;

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="@android:color/white"    android:descendantFocusability="blocksDescendants"    android:gravity="center_vertical" >    <LinearLayout        android:id="@+id/lyt_roomlistview_item"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="40dp"            android:layout_marginLeft="8dp"            android:layout_marginRight="8dp"            android:background="@android:color/white" >            <TextView                android:id="@+id/tv_accountupdateitem_title"                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:gravity="center"                android:text="title"                android:textSize="18sp" />            <TextView                android:id="@+id/tv_accountupdate_status"                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:layout_marginLeft="12dp"                android:layout_weight="1"                android:gravity="left|center"                android:text="button"                android:textColor="@android:color/holo_orange_dark"                android:textSize="16sp" />            <TextView                android:id="@+id/tv_accountupdateitem_price"                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:gravity="center"                android:text="price"                android:textColor="@android:color/holo_orange_dark"                android:textSize="16sp" />        </LinearLayout>        <LinearLayout            android:layout_width="match_parent"            android:layout_height="40dp"            android:layout_marginLeft="8dp"            android:layout_marginRight="8dp"            android:background="@android:color/white" >            <TextView                android:id="@+id/tv_accountupdateitem_buytext"                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:layout_weight="1"                android:gravity="center_vertical"                android:text="Textview"                android:textSize="16sp" />            <TextView                android:id="@+id/textView2"                android:layout_width="50dp"                android:layout_height="30dp"                android:layout_gravity="center"                android:background="@android:color/holo_orange_dark"                android:gravity="center"                android:text="@string/title_buy"                android:textColor="@android:color/white"                android:textSize="16sp" />        </LinearLayout>    </LinearLayout></RelativeLayout>

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