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Rumah > Soal Jawab > teks badan
这个程序是有点小题大做。问题是这样的，我程序中没有给listView加上Onclicklistener监听啊，为什么运行后，我随意点击任何一个ListView的items时候都弹出footer呢？
看程序吧：
主程序：
package com.example.NotifyDataSetChangeDemo;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MyActivity extends Activity implements View.OnClickListener{
private List<Article> list;
private ListView listView;
private MyAdapter adapter;
private Button loadBtn, loadMoreBtn,loadingBtn;
private Handler handler;
private LayoutInflater mInflater;
private View footer;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
loadBtn.setOnClickListener(this);
loadMoreBtn.setOnClickListener(this);
}
private void initView() {
loadBtn = (Button) findViewById(R.id.load);
loadMoreBtn = (Button) findViewById(R.id.loadMore);
loadingBtn = (Button) findViewById(R.id.loading);
list = new ArrayList<Article>();
listView = (ListView) findViewById(R.id.listView);
adapter = new MyAdapter(list, MyActivity.this);
handler = new Handler();
mInflater = LayoutInflater.from(MyActivity.this);
footer = mInflater.inflate(R.layout.footer, null);
footer.setVisibility(View.GONE);
listView.addFooterView(footer);
}
private void CreateDatas() {
if (list.size()==0){
for (int i = 0; i < 10; i++) {
Article article = new Article();
article.setTitle("I am a dog" + i);
article.setContent("Yes,you are a big dog," + i);
list.add(article);
}
}else {
Toast.makeText(MyActivity.this,"You had loaded the original datas,please stop!",Toast.LENGTH_SHORT).show();
}
}
private void CreateMoreDatas() {
int nowSize = list.size();
for (int i = nowSize; i < nowSize+5; i++) {
Article article = new Article();
article.setTitle("I am new" + i);
article.setContent("you are old man,guy," + i);
list.add(article);
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.load:
CreateDatas();
listView.setAdapter(adapter);
break;
case R.id.loadMore:
footer.setVisibility(View.VISIBLE);
handler.postDelayed(new Runnable() {
@Override
public void run() {
CreateMoreDatas();
adapter.notifyDataSetChanged();
listView.setAdapter(adapter);
footer.setVisibility(View.GONE);
}
}, 3000);
}
}
}
适配器：
package com.example.NotifyDataSetChangeDemo;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class MyAdapter extends BaseAdapter {
private List<Article> list;
private Context context;
private LayoutInflater mInflater;
public MyAdapter(List<Article> list, Context context) {
this.list = list;
this.context = context;
mInflater = LayoutInflater.from(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 holder;
if (convertView==null){
convertView = mInflater.inflate(R.layout.items, null);
holder = new ViewHolder(convertView);
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.content = (TextView) convertView.findViewById(R.id.content);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(list.get(position).getTitle());
holder.content.setText(list.get(position).getContent());
return convertView;
}
}
class ViewHolder{
View view;
TextView title;
TextView content;
public ViewHolder(View view) {
this.view = view;
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/load"
android:text="加载数据"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/loadMore"
android:text="加载更多"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</LinearLayout>
footer.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/loading"
android:text="now loading...."
android:textSize="30dp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/title"
android:textSize="25dp"
android:textStyle="bold"
android:maxLines="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/content"
android:textSize="18dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
