Android中ScrollView中放Listview自适应高度示例
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更新时间：
2015-07-17 17:15:49
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实现过程是scrollview包含着一个listview监听scrollview滚动到底边时开始向listview中添加数据
加载图片用到啦 universalimageloader 请自行引入下载地址在 http://www.zhaokeli.com/Article/6276.html
下面是一张效果图(里面用的是json加载数据使用的时候请更换成自己的数据)
首先是布局文件activity_home.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/white" android:orientation="vertical" > <ScrollView android:id="@+id/scrollid" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <!--产品列表 --> <ListView android:id="@+id/goodslist" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/white" android:cacheColorHint="@android:color/transparent" android:divider="@color/border" android:dividerHeight="1px" android:listSelector="@drawable/list_item_selector" > </ListView> <TextView android:id="@+id/loading" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_vertical|center" android:background="@color/white" android:textColor="@color/black" android:text="@string/loading" android:visibility="gone" /> </LinearLayout> </ScrollView> </LinearLayout>
下面是列表的适配器HomeGoodsListViewAdapter.java
package com.demo.adapter;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import com.demo.core.AsyncImageLoader;
import com.demo.jiuwo.R;
import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.cache.memory.impl.UsingFreqLimitedMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.ImageSize;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.decode.BaseImageDecoder;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;
import com.nostra13.universalimageloader.core.download.BaseImageDownloader;
import com.nostra13.universalimageloader.core.imageaware.ImageAware;
import com.nostra13.universalimageloader.core.imageaware.ImageViewAware;
import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.utils.StorageUtils;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.os.Handler;
import android.support.v4.util.LruCache;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class HomeGoodsListViewAdapter extends BaseAdapter {
static final List<String> displayedImages = Collections.synchronizedList(new LinkedList<String>());
private Context context; //运行上下文
private List<Map<String, Object>> listItems; //商品信息集合
private LayoutInflater listContainer; //视图容器
public final class ListItemView{ //自定义控件集合
public TextView title;
public TextView price;
public TextView goodsid;
public ImageView image;
}
public HomeGoodsListViewAdapter(Context context) {
this.context = context;
listContainer = LayoutInflater.from(context); //创建视图容器并设置上下文
this.listItems=new ArrayList<Map<String, Object>>();
}
public HomeGoodsListViewAdapter(Context context, List<Map<String, Object>> listItems) {
this.context = context;
listContainer = LayoutInflater.from(context); //创建视图容器并设置上下文
this.listItems = listItems;
}
public void addItem(Map<String,Object> o){
listItems.add(o);
}
public int getCount() {
// TODO Auto-generated method stub
return listItems.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
/**
* ListView Item设置
*/
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//自定义视图
ListItemView listItemView = null;
if (convertView == null) {
listItemView = new ListItemView();
//获取list_item布局文件的视图
convertView = listContainer.inflate(R.layout.home_goodslist_item, null);
//获取控件对象
listItemView.title = (TextView)convertView.findViewById(R.id.titleItem);
listItemView.price = (TextView)convertView.findViewById(R.id.price);
listItemView.image = (ImageView)convertView.findViewById(R.id.imageItem);
listItemView.goodsid = (TextView)convertView.findViewById(R.id.goodsid);
//设置控件集到convertView
convertView.setTag(listItemView);
}else{
listItemView = (ListItemView)convertView.getTag();
}
//设置文字和图片
String imgurl=(String) listItems.get(position).get("pic");
loadBitmap(imgurl,listItemView.image,R.drawable.default_ico);
listItemView.goodsid.setText((String) listItems.get(position)
.get("goodsid"));
listItemView.title.setText((String) listItems.get(position)
.get("title"));
listItemView.price.setText((String) listItems.get(position)
.get("price"));
return convertView;
}
/**
*
* @param urlStr 所需要加载的图片的url，以String形式传进来，可以把这个url作为缓存图片的key
* @param image ImageView 控件
* @param resId 默认显示的图片资源
*/
private void loadBitmap(String urlStr, ImageView image,int resId) {
DisplayImageOptions options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.default_ico) // 设置图片在下载期间显示的图片
.showImageForEmptyUri(R.drawable.default_ico)// 设置图片Uri为空或是错误的时候显示的图片
.showImageOnFail(R.drawable.default_ico)// 设置图片加载/解码过程中错误时候显示的图片
.resetViewBeforeLoading(true) // default
.delayBeforeLoading(1000)
.cacheInMemory(true)//设置下载的图片是否缓存在内存中
.cacheOnDisk(true) //设置下载的图片是否缓存在SD卡中
// .postProcessor(null)//在图片显示之前的操作
//.preProcessor(null) //设置图片加入缓存前，对bitmap进行设置
.extraForDownloader(null)
.considerExifParams(false) // default
.imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) // default
.bitmapConfig(Bitmap.Config.ARGB_8888) // default
// .decodingOptions(null)
.displayer(new SimpleBitmapDisplayer()) // default
.displayer(new RoundedBitmapDisplayer(20))//是否设置为圆角，弧度为多少
//.displayer(new FadeInBitmapDisplayer(100))//最好不添加会出现闪烁的情况
.handler(new Handler()) // default
.build();
//返回一个实例
ImageLoader imageLoader = ImageLoader.getInstance();
//ImageAware imageAware = new ImageViewAware(image, false);
//imageLoader.displayImage(urlStr,image,options);
//ImageSize targetSize = new ImageSize(150, 150); // result Bitmap will be fit to this size
//image.setImageBitmap(imageLoader.loadImageSync(urlStr, targetSize, options));//同步加载
imageLoader.displayImage(urlStr, image, options, new SimpleImageLoadingListener() {
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
// Do whatever you want with Bitmap
Log.v("catch",view+"");
try{
if (loadedImage != null && view!=null) {
ImageView imageView = (ImageView) view;
// imageView.setImageBitmap(loadedImage);
// 是否第一次显示
boolean firstDisplay = !displayedImages.contains(imageUri);
if (firstDisplay) {
// 图片淡入效果
FadeInBitmapDisplayer.animate(imageView, 800);
displayedImages.add(imageUri);
}
}
}catch(Exception e){
Log.v("catch1",e.getMessage());
}
}
});
}
}下面是HomeActivity.java
package com.demo.jiuwo.ui;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.baidu.android.pushservice.PushConstants;
import com.baidu.android.pushservice.PushManager;
import com.demo.adapter.GridViewAdapter;
import com.demo.adapter.HomeGoodsListViewAdapter;
import com.demo.jiuwo.BaseActivity;
import com.demo.jiuwo.R;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.WindowManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageSwitcher;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView.OnItemClickListener;
public class HomeActivity extends BaseActivity {
protected WebView webview;
private boolean okload;//标记是否可以加载
protected ListView goodslistview;
private ScrollView mScrollView;
protected TextView loading;
protected ArrayList<Map<String, Object>> goodslistItems; //产品列表
private HomeGoodsListViewAdapter goodslistviewadapter; //产品适配器
@Override
protected void onCreate(Bundle savedInstanceState) {
okload=true;
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
goodslistview = (ListView) findViewById(R.id.goodslist);
mScrollView= (ScrollView) findViewById(R.id.scrollid);
loading= (TextView) findViewById(R.id.loading);
initListener();
//后台请求产品列表
loaddata();
}
private void loaddata(){
new Thread(new Runnable() {
public void run() {
okload=false;
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
loading.setVisibility(View.VISIBLE);
}
});
try{
boolean firstload=false;
int count=0;
if(goodslistviewadapter == null){
firstload=true;
goodslistviewadapter = new HomeGoodsListViewAdapter(HomeActivity.this); //创建适配器
}else{
count = goodslistviewadapter.getCount();
}
//后台请求产品列表
// TODO Auto-generated method stub
String jsonstr=getUrlPage("填写上你自己的json地址");
if(jsonstr!=""){
try{
JSONArray jsonarr= new JSONObject(jsonstr).getJSONArray("goods_list");
for(int i = 0; i < jsonarr.length() ; i++){
JSONObject jsonObj = ((JSONObject)jsonarr.opt(i));
int id = jsonObj.getInt("id");
String pic = jsonObj.getString("pic");
String title = jsonObj.getString("title");
String price = jsonObj.getString("price");
Map<String, Object> map = new HashMap<String, Object>();
map.put("pic", pic);
map.put("title", title);
map.put("price", price);
map.put("id", id);
if(!map.isEmpty()){
goodslistviewadapter.addItem(map);
}
}
if(firstload){
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
goodslistview.setAdapter(goodslistviewadapter);
}
});
}
Log.v("adapter_count",goodslistviewadapter.toString());
// 发送消息
handler.sendMessage(handler.obtainMessage(100,
null));
//goodslistview.setSelection(lastItem - 1);
}catch(JSONException e){
Log.v("json_err",e.getMessage());
}
}else{
Toast.makeText(getApplicationContext(), "已经没有内容啦！",
Toast.LENGTH_SHORT).show();
}
}catch(Exception e){
Log.v("json_err",e.getMessage());
}
}
}).start();
}
//动态设置listview的高度
public void setListViewHeightBasedOnChildren(ListView listView) {
// 获取ListView对应的Adapter
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount()-1));
((MarginLayoutParams)params).setMargins(10, 10, 10, 10);
listView.setLayoutParams(params);
}
/**
* 初始化事件绑定
**/
private void initListener(){
goodslistview.setOnItemClickListener(new OnItemClickListener(){
@Override
//arg0:就是你的listview arg2:点击的item的位置。和你的数组的下标相等。arg3:被电击view的id
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
try{
Map<String, Object> map=goodslistItems.get(arg2);
String titleitem=map.get("id").toString();
Intent intent=new Intent();
Bundle bundle=new Bundle();
bundle.putString("goodsid",titleitem);
intent.putExtras(bundle);
intent.setClass(HomeActivity.this,GoodsActivity.class);
startActivity(intent);
finish();
inright();
}catch(Exception e){
e.printStackTrace();
}
}
});
//scrollview滚动到底部监听
mScrollView.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
switch (arg1.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
int scrollY=arg0.getScrollY();
int height=arg0.getHeight();
int scrollViewMeasuredHeight=mScrollView.getChildAt(0).getMeasuredHeight();
if(scrollY==0){
System.out.println("滑动到了顶端 view.getScrollY()="+scrollY);
}
if((scrollY+height)==scrollViewMeasuredHeight){
System.out.println("滑动到了底部 scrollY="+scrollY);
System.out.println("滑动到了底部 height="+height);
System.out.println("滑动到了底部 scrollViewMeasuredHeight="+scrollViewMeasuredHeight);
if(okload){
loaddata();
}
}
break;
default:
break;
}
return false;
}
});
}
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
//通知listview更新界面
goodslistviewadapter.notifyDataSetChanged();
loading.setVisibility(View.GONE);
setListViewHeightBasedOnChildren(goodslistview);
okload=true;//可以再次加载
};
};
}
