Android ListView

摘要：的三种适配器支持集合，只能展现一行文字具有扩展性，可以自定义多种效果抽象类，继承这个类并且重写相关方法常用属性设置分割线的颜色或图片分割线不显示滚动条去掉上边和下边黑色的阴影设置快速滚动设置长按试背景色高亮显示列表在最下面设置背景时消除拖动

ArrayAdapter 支持list集合，只能展现一行文字

SimpleAdapter 具有扩展性，可以自定义多种效果

BaseAdapter 抽象类，继承这个类并且重写相关方法

android:divider 设置分割线的颜色或图片

android:divider 分割线

android:scrollbars="none" 不显示滚动条

android:fadingEdge="none" 去掉上边和下边黑色的阴影

android:fastScrollEnable="true" 设置快速滚动

android:drawSelectorOnTop="true" 设置长按试背景色高亮

android:stackFromBottom="true" 显示列表在最下面

android:cacheColorHint=“#000000” 设置背景时消除拖动的黑色阴影

android:headerDividersEnabled=“false” 不会在页眉画分割线

android:footerDividersEnabled=“false” 不会在页脚画分割线

android:descendantFocusability="blocksDescendants" 给子view设置，取消子控件的焦点

simple_list_item_1 : 多带带一行的文本框，常用

simple_list_item_2 : 两个文本框组成

simple_list_item_checked : 每项都是由一个已选中的列表项 慎用

imple_list_item_multiple_choice : 都带有一个复选框 慎用

simple_list_item_single_choice : 都带有一个单选钮 慎用

setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL) 设置多选状态 慎用

listview.setAdapter(new ArrayAdapter(this,
                android.R.layout.simple_list_item_multiple_choice,new String[]{"元旦","清明","劳动节","端午节","中秋节"}));

List> mList = new ArrayList>();
for (int i = 0; i < idCard.length; i++) {
        Map map = new HashMap();
        map.put("name", idCard[i]);
        map.put("sex",  "sex"+i);
        map.put("number","number"+i);
        list.add(map);
}


SimpleAdapter adapter = new SimpleAdapter(this, mList,
                       R.layout.item_listview, new String[] { "name", "sex","number" }, 
　　　　　　　　　　　　 　newint[] {R.id.listview_item_name,R.id.listview_item_sex,R.id.listview_item_number });

class MyAdapter extends BaseAdapter {
    private Context context = null;
    public MyAdapter(Context context) {
            this.context = context;
    }
    @Override
    public int getCount() {
            return list.size();
    }
    @Override
    public Object getItem(int position) {
            return list.get(position);
    }
    @Override
    public long getItemId(int position) {
            return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder mHolder;
            if (convertView == null) {
                    mHolder = new ViewHolder();
                    LayoutInflater inflater = LayoutInflater.from(context);
                    convertView = inflater.inflate(R.layout.item_listview, null, true);
                    mHolder.text_item_listview_username = (TextView) convertView.findViewById(R.id.listview_item_name);
                    mHolder.text_item_listview_email = (TextView) convertView.findViewById(R.id.listview_item_sex);
                    mHolder.imageView_item_listview_headpic = (ImageView) convertView.findViewById(R.id.listview_item_number);
                    convertView.setTag(mHolder);
            } else {
                    mHolder = (ViewHolder) convertView.getTag();
            }
            String name = list.get(position).get("name").toString();
            String sex = list.get(position).get("sex").toString();
            String number = list.get(position).get("number").toString();

　　　　　　　mHolder.listview_item_name.setText(name);
            mHolder.listview_item_sex.setText(sex);
            mHolder.listview_item_number.setText(number);
            return convertView;
    }

    class ViewHolder {
            private TextView listview_item_name;
            private TextView listview_item_sex;
            private TextView listview_item_number;
    }
}

public class MyListView extends ListView implements OnScrollListener{
    
    private FootLayout flayout;
    private Scroller scroller;
    private ListViewListener lvListener;
    private float mlastY;
    private int itemConut=-1;
    private int PULL_LOAD_MORE_DELTA=150;
    private int SCROLL_DURATION=400;
    public MyListView(Context context) {
        super(context);
        initView(context);
        // TODO Auto-generated constructor stub
    }
    public MyListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
        // TODO Auto-generated constructor stub
    }
    public MyListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView(context);
        // TODO Auto-generated constructor stub
    }
    public void initView(Context context){
        super.setOnScrollListener(this);
        scroller=new Scroller(context, new DecelerateInterpolator());
        flayout= new FootLayout(context);
        flayout.setState(FootLayout.STATE_NO);
        flayout.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                statrView();
            }
        });
    }
    @Override
    public void setAdapter(ListAdapter adapter) {
        // TODO Auto-generated method stub
        addFooterView(flayout);
        super.setAdapter(adapter);
    }
    public void statrView(){
        flayout.setState(FootLayout.STATE_LOADING);
        if(lvListener!=null){
            lvListener.onLoadMore();
        }
    }
    public void stopView(){
        flayout.setState(FootLayout.STATE_NO);
    }
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // TODO Auto-generated method stub
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mlastY=ev.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                final float deltaY=ev.getRawY()-mlastY;
                mlastY=ev.getRawY();
                if(getLastVisiblePosition()==itemConut-1){
                    updateFooterHeight(-deltaY);
                }
                break;
            default:
                if (getLastVisiblePosition() == itemConut - 1) {
                    
                    // 调用加载更多
                    if (flayout.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
                        statrView();// 如果底部视图高度大于可以加载高度，那么就开始加载
                    }
                    resetFooterHeight();// 重置加载更多视图高度
                }
                break;
        }
        return super.onTouchEvent(ev);
    }
    private void updateFooterHeight(float arg0){
        int height=flayout.getBottomMargin()+(int)arg0;
            if (height > PULL_LOAD_MORE_DELTA) { 
                flayout.setState(FootLayout.STATE_READY);
            } else {
                flayout.setState(FootLayout.STATE_NO);
            }
        flayout.setBottomMargin(height);
    }
    private void resetFooterHeight() {
        int bottomMargin = flayout.getBottomMargin();
        if (bottomMargin > 0) {
            scroller.startScroll(0, bottomMargin, 0, -bottomMargin,
                    SCROLL_DURATION);
            invalidate();
        }
    }
    @Override
    public void computeScroll() {
        if (scroller.computeScrollOffset()) {
            flayout.setBottomMargin(scroller.getCurrY());
            postInvalidate();
        }
        super.computeScroll();
    }
    public interface ListViewListener {
        public void onLoadMore();
    }
    public void setListViewListener(ListViewListener l) {
        lvListener=l;
    }
    @Override
    public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {
        // TODO Auto-generated method stub
        itemConut=arg3;
    }
    @Override
    public void onScrollStateChanged(AbsListView arg0, int arg1) {
        // TODO Auto-generated method stub
    }
    
}

public class FootLayout extends LinearLayout{
    static int STATE_READY=0,STATE_LOADING=1,STATE_NO=2;
    private RelativeLayout rlayout;
    private TextView tv;
    private ProgressBar pb;
    public FootLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        initView(context);
    }
    public FootLayout(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        initView(context);
    }
    public void initView(Context context){
        LinearLayout layout=(LinearLayout) LayoutInflater.from(context).inflate(R.layout.foot_view, null);
        addView(layout);
        layout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 
            LayoutParams.WRAP_CONTENT));
        rlayout=(RelativeLayout) layout.findViewById(R.id.foot_rlayout);
        tv=(TextView) layout.findViewById(R.id.foot_text);
        pb=(ProgressBar) layout.findViewById(R.id.foot_progressbar);
    }
    public void hide(){
        rlayout.setVisibility(View.VISIBLE);
    }
    public void show(){
        rlayout.setVisibility(View.INVISIBLE);
    }
    public void setState(int state){
        tv.setVisibility(View.INVISIBLE);
        pb.setVisibility(View.INVISIBLE);
        if(state==STATE_READY){
            tv.setVisibility(View.VISIBLE);
            tv.setText("松开显示更多");
        }else if(state==STATE_LOADING){
            pb.setVisibility(View.VISIBLE);
        }else{
            tv.setVisibility(View.VISIBLE);
            tv.setText("加载更多");
        }
    }
    public void setBottomMargin(int height) {
        if (height < 0)
            return;
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) rlayout
                .getLayoutParams();
        lp.bottomMargin = height;
        rlayout.setLayoutParams(lp);
    }

    public int getBottomMargin() {
        LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) rlayout
                .getLayoutParams();
        return lp.bottomMargin;
    }
}

public class MainActivity extends Activity implements IXListViewListener{
    private ListViews mylists;
    private SimpleAdapter mAdapter;
    private List> mlist;
    private Handler mHandler;   
    @Override  
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);  
        mylists =(ListViews) findViewById(R.id.myListView);
        mlist=new ArrayList>();
        mAdapter = new SimpleAdapter(MainActivity.this, getData(),
                R.layout.list_item, new String[] { "name", "img", "content" },
                new int[] { R.id.title, R.id.mImage, R.id.content });
        mylists.setAdapter(mAdapter);
        mylists.setPullLoadEnable(true);
        mylists.setXListViewListener(this);
        mHandler = new Handler();
    }
    String data[] = new String[] { "勇士", "火箭", "湖人",
            "凯尔特人", "雷霆" };
    String data1[] = new String[] { "汤普森", "哈登", "詹姆斯",
            "塔图姆", "维斯布鲁克" };

    private List> getData() {
        for (int i = 0; i < data.length; i++) {
            Map map = new HashMap();
            map.put("name", data[i]);
            map.put("content", data1[i]);
            map.put("img", R.drawable.ic_launcher);
            mlist.add(map);
        }
        return mlist;
    }  
        // 加载更多
        @Override
        public void onLoadMore() {
            mHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    getData();
                    mAdapter.notifyDataSetChanged();
                    onLoad();
                }
            }, 1500);  
        }
        private void onLoad() {
            mylists.stopLoadMore();
        }
}