吳裕雄--天生自然ANDROID開發學習:2.4.5 ListView簡單實用
阿新 • • 發佈:2020-08-29
1.自定義BaseAdapter,然後繫結ListView的最簡單例子
Animal.java: /** * Created by Jay on 2015/9/18 0018. */ public class Animal { private String aName; private String aSpeak; private int aIcon; public Animal() { } public Animal(String aName, String aSpeak, int aIcon) { this.aName = aName; this.aSpeak = aSpeak; this.aIcon = aIcon; } public String getaName() { return aName; } public String getaSpeak() { return aSpeak; } public int getaIcon() { return aIcon; } public void setaName(String aName) { this.aName = aName; } public void setaSpeak(String aSpeak) { this.aSpeak = aSpeak; } public void setaIcon(int aIcon) { this.aIcon = aIcon; } } AnimalAdapter.java:自定義的BaseAdapter: /** * Created by Jay on 2015/9/18 0018. */ public class AnimalAdapter extends BaseAdapter { private LinkedList<Animal> mData; private Context mContext; public AnimalAdapter(LinkedList<Animal> mData, Context mContext) { this.mData = mData; this.mContext = mContext; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list_animal,parent,false); ImageView img_icon = (ImageView) convertView.findViewById(R.id.img_icon); TextView txt_aName = (TextView) convertView.findViewById(R.id.txt_aName); TextView txt_aSpeak = (TextView) convertView.findViewById(R.id.txt_aSpeak); img_icon.setBackgroundResource(mData.get(position).getaIcon()); txt_aName.setText(mData.get(position).getaName()); txt_aSpeak.setText(mData.get(position).getaSpeak()); return convertView; } } 最後是MainActivity.java: public class MainActivity extends AppCompatActivity { private List<Animal> mData = null; private Context mContext; private AnimalAdapter mAdapter = null; private ListView list_animal; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; list_animal = (ListView) findViewById(R.id.list_animal); mData = new LinkedList<Animal>(); mData.add(new Animal("狗說", "你是狗麼?", R.mipmap.ic_icon_dog)); mData.add(new Animal("牛說", "你是牛麼?", R.mipmap.ic_icon_cow)); mData.add(new Animal("鴨說", "你是鴨麼?", R.mipmap.ic_icon_duck)); mData.add(new Animal("魚說", "你是魚麼?", R.mipmap.ic_icon_fish)); mData.add(new Animal("馬說", "你是馬麼?", R.mipmap.ic_icon_horse)); mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext); list_animal.setAdapter(mAdapter); } }
2.表頭表尾分割線的設定: listview作為一個列表控制元件,他和普通的列表一樣,可以自己設定表頭與表尾: 以及分割線,可供我們設定的屬性如下: footerDividersEnabled:是否在footerView(表尾)前繪製一個分隔條,預設為true headerDividersEnabled:是否在headerView(表頭)前繪製一個分隔條,預設為true divider:設定分隔條,可以用顏色分割,也可以用drawable資源分割 dividerHeight:設定分隔條的高度 翻遍了了API發現並沒有可以直接設定ListView表頭或者表尾的屬性,只能在Java中寫程式碼 進行設定了,可供我們呼叫的方法如下: addHeaderView(View v):新增headView(表頭),括號中的引數是一個View物件 addFooterView(View v):新增footerView(表尾),括號中的引數是一個View物件 addHeaderView(headView,null, false):和前面的區別:設定Header是否可以被選中 addFooterView(View,view,false):同上 對了,使用這個addHeaderView方法必須放在listview.setAdapter前面,否則會報錯。
程式碼實現: 先編寫下表頭與表尾的佈局: view_header.xml(表頭),表尾一樣,就不貼了: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:gravity="center"> <TextView android:layout_width="match_parent" android:layout_height="48dp" android:textSize="18sp" android:text="表頭" android:gravity="center" android:background="#43BBEB" android:textColor="#FFFFFF"/> </LinearLayout> MainActivty.java: public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{ private List<Animal> mData = null; private Context mContext; private AnimalAdapter mAdapter = null; private ListView list_animal; private LinearLayout ly_content; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; list_animal = (ListView) findViewById(R.id.list_animal); //動態載入頂部View和底部View final LayoutInflater inflater = LayoutInflater.from(this); View headView = inflater.inflate(R.layout.view_header, null, false); View footView = inflater.inflate(R.layout.view_footer, null, false); mData = new LinkedList<Animal>(); mData.add(new Animal("狗說", "你是狗麼?", R.mipmap.ic_icon_dog)); mData.add(new Animal("牛說", "你是牛麼?", R.mipmap.ic_icon_cow)); mData.add(new Animal("鴨說", "你是鴨麼?", R.mipmap.ic_icon_duck)); mData.add(new Animal("魚說", "你是魚麼?", R.mipmap.ic_icon_fish)); mData.add(new Animal("馬說", "你是馬麼?", R.mipmap.ic_icon_horse)); mAdapter = new AnimalAdapter((LinkedList<Animal>) mData, mContext); //新增表頭和表尾需要寫在setAdapter方法呼叫之前!!! list_animal.addHeaderView(headView); list_animal.addFooterView(footView); list_animal.setAdapter(mAdapter); list_animal.setOnItemClickListener(this); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(mContext,"你點選了第" + position + "項",Toast.LENGTH_SHORT).show(); } }
3.列表從底部開始顯示:stackFromBottom 如果你想讓列表顯示你列表的最下面的話,那麼你可以使用這個屬性,將stackFromBottom 屬性設定為true即可,設定後的效果圖如下:
4.設定點選顏色cacheColorHint 如果你為ListView設定了一個圖片作為Background的話,當你拖動或者點選listView空白位置會發現 item都變成黑色了,這是時候我們可以通過這個cacheColorHint將顏色設定為透明:#00000000 5.隱藏滑動條 我們可以通過設定:android:scrollbars="none" 或者 setVerticalScrollBarEnabled(true); 解決這個問題!