ListView使用模拟数据进行分批加载测试

1.ListView的尾部文件 footview.xml

<?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"    >    <ProgressBar        android:id="@+id/footer_progressbar"        style="@android:style/Widget.ProgressBar.Small.Inverse"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:visibility="gone" />    <TextView        android:id="@+id/footer_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="点击加载更多"        android:textColor="#000000"        android:textSize="15sp"       android:layout_centerHorizontal="true"        /></RelativeLayout>

2.MainActivity的布局文件

<?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:clipToPadding="true"    android:fitsSystemWindows="true"    android:background="#6699ff"    android:orientation="vertical" >    <RelativeLayout        android:layout_width="fill_parent"        android:layout_height="50dp"        android:orientation="vertical"        >        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textSize="20sp"            android:layout_centerInParent="true"            android:textColor="#ffffff"            android:text="标题"            />        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_centerVertical="true"            android:paddingLeft="20dp"            android:paddingRight="20dp"            android:textSize="16sp"            android:textColor="#ffffff"            android:text="返回"            android:background="#00000000"            />        <Button            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:layout_centerVertical="true"            android:paddingLeft="20dp"            android:paddingRight="20dp"            android:textSize="16sp"            android:textColor="#ffffff"            android:text="设置"            android:background="#00000000"            />    </RelativeLayout>    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="#ffffff"        android:orientation="vertical"        android:gravity="center"        >        <ListView            android:id="@+id/listview"            android:layout_width="match_parent"            android:layout_height="match_parent">        </ListView>    </LinearLayout></LinearLayout>

3.ListView的item布局

<?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">    <TextView        android:id="@+id/list_item_tv"        android:layout_width="fill_parent"        android:layout_height="45dp"        android:paddingLeft="10dp"        android:gravity="center_vertical"        android:textColor="#000000"        android:textSize="15sp"        /></LinearLayout>

4.定义ListView的适配器

public class ListAdapter extends BaseAdapter{    private Context context;    private List<String> data;    public ListAdapter(Context context){        this.context = context;        data = new ArrayList<String>();    }    public void addItem(String item){        this.data.add(item);    }    @Override    public int getCount() {        return data.size();    }    @Override    public String getItem(int position) {        return data.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if(convertView == null){            convertView = LayoutInflater.from(context).inflate(R.layout.list_item, null);        }        TextView tv = (TextView) convertView.findViewById(R.id.list_item_tv);        tv.setText(getItem(position));        return convertView;    }}

5.代码实现

import android.os.AsyncTask;import android.os.Build;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private ListView listView;    private ListAdapter adapter;    private View footerView;    private ProgressBar footerPb;    private TextView footerTv;    private int pageIndex = 1;//当前加载到哪一页    private int pageSize = 10;//每一页的数据条数    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //判断当前SDK版本号，如果是4.4以上，就是支持沉浸式状态栏的        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);        }        initView();        initData();    }    private void initView(){        listView = (ListView) findViewById(R.id.listview);        adapter = new ListAdapter(this);        footerView = LayoutInflater.from(this).inflate(R.layout.footview, null);        footerPb = (ProgressBar) footerView.findViewById(R.id.footer_progressbar);        footerTv = (TextView) footerView.findViewById(R.id.footer_tv);        listView.addFooterView(footerView);    }    private void initData(){        for(int i = 0; i < 15; i++){            adapter.addItem("item " + i);        }        listView.setAdapter(adapter);        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                                    long arg3) {                if(arg2 == adapter.getCount()){                    //点击的是footerView，加载更多                    new LoadMoreDataTask().execute();                }else{                    //点击的是ListView的数据项                    Toast.makeText(MainActivity.this, adapter.getItem(arg2), Toast.LENGTH_SHORT).show();                }            }        });    }    private class LoadMoreDataTask extends AsyncTask<Void, Void, Void> {        @Override        protected void onPreExecute() {            super.onPreExecute();            //修改footerView的显示状态            footerPb.setVisibility(View.VISIBLE);            footerTv.setText("正在加载...");        }        @Override        protected Void doInBackground(Void... arg0) {            try {                //模拟网络请求获取数据                Thread.sleep(1000);            } catch (InterruptedException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Void result) {            super.onPostExecute(result);            //修改footerView的显示状态            footerPb.setVisibility(View.GONE);            footerTv.setText("点击加载更多");            pageIndex++;            int count = adapter.getCount();            //模拟增加数据            for(int i = count; i < count + pageSize; i++){                adapter.addItem("new item " + i);            }            adapter.notifyDataSetChanged();            //模拟数据取完，将ListView的FooterView移除            if(pageIndex * pageSize >= 35){                listView.removeFooterView(footerView);            }        }    }}

6.Demo测试效果