listview的分页

分页原理：

1、设置setOnScrollListener监听滑动到底部

  // 设置listview的滚动监听        // 设置分页        lv.setOnScrollListener(new AbsListView.OnScrollListener() {            @Override            public void onScrollStateChanged(AbsListView view, int scrollState) {                switch (scrollState) {                    case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:                    // 滚动停止（不一定到了底部）                        if (isBottom) {                            lv.addFooterView(footer);                            handler.postDelayed(new Runnable() {                                @Override                                public void run() {                                    getNextData();                                    lv.removeFooterView(footer);                                }                            }, 3000);                        }                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_FLING:                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:                        break;                }            }            @Override            public void onScroll(AbsListView view, int firstVisibleItem,                                 int visibleItemCount, int totalItemCount) {                isBottom = ((firstVisibleItem + visibleItemCount) == totalItemCount);            }        });

2、lv.addFooterView和lv.removeFooterView的使用

 lv.addFooterView(footer); lv.setAdapter(adapter); lv.removeFooterView(footer);// 移除掉

3、更新完数据刷新界面

  notifyDataSetChanged();

示例demo一：

package com.example.administrator.mylistviewpager;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.SystemClock;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;import java.util.ArrayList;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;public class MainActivityIIIII extends AppCompatActivity {    @BindView(R.id.listView_MainActivity)    ListView lv;    private ArrayList<String> data;    private MyBaseAdapter adapter;    private View footer;//加载视图：progressbar和textview提示    private static final int SUCCESS_GET_DATA = 0;    private boolean finish = true; // 是否加载完成    private boolean isBottom;    private Handler handler = new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_mainiiii);        ButterKnife.bind(this);        adapter = new MyBaseAdapter();        //加载时提示        footer = View.inflate(getApplicationContext(), R.layout.footer, null);        // 这里必须添加页脚让setAdapter里面满足        // if (mHeaderViewInfos.size() > 0|| mFooterViewInfos.size() > 0)条件        lv.addFooterView(footer);        lv.setAdapter(adapter);        lv.removeFooterView(footer);// 移除掉        // 设置listview的滚动监听        // 设置分页        lv.setOnScrollListener(new AbsListView.OnScrollListener() {            @Override            public void onScrollStateChanged(AbsListView view, int scrollState) {                switch (scrollState) {                    case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:// 滚动停止（不一定到了底部）                        if (isBottom) {                            lv.addFooterView(footer);                            handler.postDelayed(new Runnable() {                                @Override                                public void run() {                                    getNextData();                                    lv.removeFooterView(footer);                                }                            }, 3000);                        }                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_FLING:                        break;                    case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:                        break;                }            }            @Override            public void onScroll(AbsListView view, int firstVisibleItem,                                 int visibleItemCount, int totalItemCount) {                isBottom = ((firstVisibleItem + visibleItemCount) == totalItemCount);            }        });    }    public void getNextData() {        // 得到当前的记录数        int count = adapter.getCount();        List<String> datas = new ArrayList<String>();        for (int i = count; i < count + 20; i++) {            datas.add("item" + i);        }        adapter.addData(datas);    }    //处理数据并绑定到view上    class MyBaseAdapter extends BaseAdapter {        private List<String> list = new ArrayList<String>();       //1. 集合  ：  数据源        // 第一次初始化，先加载第一屏幕，到19就开始加载        public MyBaseAdapter() {            //2. 构造方法            for (int i = 0; i < 20; i++) {                list.add("item" + i);            }        }        @Override        public int getCount() {            return this.list.size();        }        @Override        public Object getItem(int position) {            return this.list.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertview, ViewGroup parent) {       //3. 重写getView等方法            if (convertview == null) {                convertview = getLayoutInflater().inflate(android.R.layout.simple_list_item_1, null);            }            // 默认系统布局android.R.layout.simple_list_item_1 ，id为android.R.id.text1            TextView textview = (TextView) convertview.findViewById(android.R.id.text1);            textview.setText(this.list.get(position));            return convertview;        }        public void addData(List<String> items) {            this.list.addAll(items);            notifyDataSetChanged();        }    }}

主界面布局：

<?xml version="1.0" encoding="utf-8"?><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="match_parent">    <ListView        android:id="@+id/listView_MainActivity"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:color/holo_green_light" /></RelativeLayout>

footer.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal">    <ProgressBar        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:text="正在加载数据..........."        android:textColor="@android:color/white"        android:textSize="20sp" /></LinearLayout>

示例二：

参考：ListView“加载更多分页功能

LoadListView

public class LoadListView extends ListView implements AbsListView.OnScrollListener {    private boolean isLoading;//正在加载    private OnLoadListener onLoadListener;    private boolean canLoad;    private LinearLayout footerContainer;    public LoadListView(Context context) {        this(context, null);    }    public LoadListView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public LoadListView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        View footerLayout = LayoutInflater.from(context).inflate(R.layout.footer_layout, this, false);        footerContainer = ((LinearLayout) footerLayout.findViewById(R.id.footer_container));        footerContainer.setVisibility(View.GONE);        this.addFooterView(footerContainer);        this.setOnScrollListener(this);    }    @Override    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {        //到达底部且多于一页        canLoad = ((firstVisibleItem + visibleItemCount) == totalItemCount) && visibleItemCount < totalItemCount;        if (canLoad && footerContainer.getVisibility() == GONE) {            footerContainer.setVisibility(View.VISIBLE);         }    }    @Override    public void onScrollStateChanged(AbsListView view, int scrollState) {        if (canLoad && scrollState == SCROLL_STATE_IDLE) {            if (!isLoading) {                isLoading = true;                footerContainer.setVisibility(View.VISIBLE);                onLoadListener.onLoad();            }        }    }    public void loadComplete() {        isLoading = false;        footerContainer.setVisibility(View.GONE);    }    public void setOnLoadListener(OnLoadListener onLoadListener) {        this.onLoadListener = onLoadListener;    }    interface OnLoadListener {        void onLoad();    }}

LoadActivity

public class LoadActivity extends AppCompatActivity {    private ArrayList<String> lists;    private LoadListView lv;    private ArrayAdapter<String> adapter;    private Handler handler = new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.load_act);        lists = new ArrayList<>();        addDatas(lists);        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, lists);        lv = ((LoadListView) this.findViewById(R.id.lv));        lv.setAdapter(adapter);        lv.setOnLoadListener(new LoadListView.OnLoadListener() {            @Override            public void onLoad() {                handler.postDelayed(new Runnable() {                    @Override                    public void run() {                        addDatas(lists);                        adapter.notifyDataSetChanged();                        lv.loadComplete();                    }                }, 500);            }        });    }    private void addDatas(ArrayList<String> lists) {        int nextInt = new Random().nextInt(100);        for (int i = 0; i < 15; i++) {            lists.add("" + nextInt + "我是第" + i + "条");        }    }}

load_act.xml布局：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <com.joanzapata.android.pulldown.LoadListView        android:id="@+id/lv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="@android:color/holo_green_light"        android:divider="#ff0000"        android:dividerHeight="5dp" /></RelativeLayout>

footer_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/footer_container"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="@color/yellow"    android:gravity="center"    android:orientation="horizontal">    <ProgressBar        android:layout_width="30dp"        android:layout_height="30dp" />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="正在加载数据..........."        android:textColor="@android:color/white"        android:textSize="20sp" /></LinearLayout>