Android基础控件ListView和自定义BaseAdapter适配器

1、简介

　　ListView用于列表显示，相当于OC中的TableView，和适配器一块使用，相关属性：

footerDividersEnabled：是否在footerView(表尾)前绘制一个分隔条,默认为true
headerDividersEnabled:是否在headerView(表头)前绘制一个分隔条,默认为true
divider:设置分隔条,可以用颜色分割,也可以用drawable资源分割
dividerHeight:设置分隔条的高度
addHeaderView(View v)：添加headView(表头),括号中的参数是一个View对象
addFooterView(View v)：添加footerView(表尾)，括号中的参数是一个View对象
addHeaderView(headView, null, false)：和前面的区别：设置Header是否可以被选中
addFooterView(View,view,false)：和前面的区别：设置Footer是否可以被选中
android:stackFromBottom="true"：底部对齐显示
android:scrollbars="none"：滑动条样式

2、自定义的CustomAdapter

　　自定义model类Custom：

public class Custom {
    private  String aName;
    private  String aSpeak;
    private  int aIcon;

    public Custom(){}

    public Custom(String aName,String aSpeak,int aIcon){
        this.aIcon = aIcon;
        this.aName = aName;
        this.aSpeak = aSpeak;
    }
    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;
    }

}

　　自定义的CustomAdapter：

public class CustomAdapter extends BaseAdapter {
    private LinkedList<Custom> aData;
    private Context mContext;

    public CustomAdapter(LinkedList<Custom> aData,Context mContext){
        this.aData = aData;
        this.mContext = mContext;
    }
    @Override
    public int getCount(){
        return aData.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){
        ViewHolder holder = null;
        if (convertView==null){
            convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item,parent,false);
            holder = new ViewHolder();
            holder.imageView = (ImageView)convertView.findViewById(R.id.imgtou);
            holder.nameTextView = (TextView)convertView.findViewById(R.id.name);
            holder.sayTextView = (TextView)convertView.findViewById(R.id.says);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder)convertView.getTag();
        }
        holder.imageView.setBackgroundResource(aData.get(position).getaIcon());
        holder.nameTextView.setText(aData.get(position).getaName());
        holder.sayTextView.setText(aData.get(position).getaSpeak());
        return convertView;
    }
    static class ViewHolder{
        ImageView imageView;
        TextView nameTextView;
        TextView sayTextView;
    }

}

3、实现自定义显示

　　list_item.xml文件item的布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:gravity="center"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/imgtou"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:baselineAlignBottom="true"
        android:paddingLeft="8dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="8dp"
            android:textColor="#1D1D1C"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/says"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="8px"
            android:textColor="#B4B4B9"
            android:textSize="14sp" />

    </LinearLayout>
</LinearLayout>

　　Java文件：

public class LoginActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {

    private String[] names = new String[]{"猪八戒","孙悟空","唐僧"};
    private String[] says = new String[]{"饿了","吃俺老孙一棒","紧箍咒"};
    private  int[] images = new int[]{R.drawable.icon,R.drawable.icon,R.drawable.icon};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        ListView list_test = (ListView) findViewById(R.id.listview);
        final LayoutInflater inflater = LayoutInflater.from(this);
        View headView = inflater.inflate(R.layout.list_header, null, false);
        View footView = inflater.inflate(R.layout.list_header, null, false);

        List<Custom> aData = new LinkedList<Custom>();
        for (int i=0;i<names.length;i++){
            aData.add(new Custom(names[i],says[i],images[i]));
        }
        //添加表头和表尾需要写在setAdapter方法调用之前！！！
        list_test.addHeaderView(headView);
        list_test.addFooterView(footView);

        list_test.setAdapter(new CustomAdapter((LinkedList<Custom>)aData,LoginActivity.this));
        list_test.setOnItemClickListener(this);
    }
    @Override
    public void onItemClick(AdapterView<?>parent,View view,int position,long id){
        Toast.makeText(LoginActivity.this,"你点击了第" + position + "项",Toast.LENGTH_SHORT).show();

    }

}

注意：

　　A：addHeaderView方法必须放在listview.setAdapter前面，否则会报错。

　　B：添加表头后，第一个item的position为1，表头占一个。