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ListView常用方法-案例介紹

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***ListView的常用方法
實例:設置一個ListView的頁面,其頁面頭部是圖片,尾部是Button按鈕

方式一:
首先在對應的布局文件中添加ListView控件,然後可在主活動文件中對該頁面添加頭部和尾部相應控件,如下:

public class MainActivity extends Activity {
    private ListView lv;
    private List<String> list;
    private ArrayAdapter<String> adapter;
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        tv = (TextView) findViewById(R.id.tv);
        lv = (ListView) findViewById(R.id.lv);
        list = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            list.add("item"+i);
        }
        adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, list);
        //添加圖片控件
        ImageView iv = new ImageView(MainActivity.this);
        iv.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));
        iv.setImageResource(R.drawable.ic_launcher);
        
        lv.addHeaderView(iv);//將參數中指定的控件View添加到ListView的頭部
                             //註意:addHeaderView()方法必須在setAdapter()方法之前設置
        //添加button控件
        Button bt = new Button(MainActivity.this);
        bt.setText("加載更多.....");
        bt.setTextSize(20);
        bt.setOnClickListener(new OnClickListener() {       
            @Override
            public void onClick(View v) {
                int index = list.size();
                for (int i = index; i < index+10; i++) {
                    list.add("item"+i);
                }
                adapter.notifyDataSetChanged();//該方法是如果適配器的內容改變時強制調用getView來刷新每個Item的內容 
            }
        });
        lv.addFooterView(bt);//將參數中指定的控件View添加到ListView的尾部
                             //註意:addFooterView()方法必須在setAdapter()方法之前設置
        
        lv.setAdapter(adapter);
        
        lv.setEmptyView(tv);  //表示TextView中國如果沒有顯示的數據時顯示參數指定的View視圖
    }

}

方式二:
當然也可以通過在創建兩個布局文件的形式展示同樣的效果,不需要在主活動文件中直接添加控件,修改如下:
首先在lv_header.xml中添加ImaageView控件,lv_footer.xml中添加Button控件,主布局文件中添加ListView控件

public class OtherActivity extends Activity {
    private ListView lv;
    private List<String> list;
    private ArrayAdapter<String> adapter;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        lv = (ListView) findViewById(R.id.lv);
        list = new ArrayList<String>();
        for (int i = 0; i < 10; i++) {
            list.add("item"+i);
        }
        adapter = new ArrayAdapter<String>(OtherActivity.this,android.R.layout.simple_list_item_1, list);
        
        View headerView = LayoutInflater.from(OtherActivity.this).inflate(R.layout.lv_header, null);//將lv_header.xml布局文件轉換成View視圖
        ImageView iv = (ImageView) headerView.findViewById(R.id.iv);//註意:這裏必須通過headerView來調用findViewById方法
        iv.setImageResource(R.drawable.bg_us);
        lv.addHeaderView(iv);
        
        View footerView = LayoutInflater.from(OtherActivity.this).inflate(R.layout.lv_footer, null);
        Button bt = (Button) footerView.findViewById(R.id.bt);
        bt.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                int index = list.size();
                for (int i = index; i < index+10; i++) {
                    list.add("item"+i);
                }
                adapter.notifyDataSetChanged();
            }
        });
        lv.addFooterView(bt);
        
        lv.setAdapter(adapter);
    }
}

ListView常用方法-案例介紹