ScrollView中嵌套ListView

第一种方法：

在计算listview总高度并设置

使用该方法需要注意：子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

ScrollView下只能有一个字布局

</LinearLayout>

item布局

子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

<?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:orientation="vertical" > <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" ></TextView> </LinearLayout>

MainActivity.java（红色为方法）

package com.bawei.day06_scrollview;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

private ListView listView;
private List<String> list;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listview);
list = new ArrayList<String>();
for (int i = 0; i < 200; i++) {
list.add(i+"");
}
BaseAdapter adapter=new Adper(MainActivity.this,list);

listView.setAdapter(adapter);

}
//界面加载完
@Override
public void onWindowFocusChanged(boolean hasFocus) {
// TODO Auto-generated method stub
super.onWindowFocusChanged(hasFocus);
setListViewHeightBasedOnChildren(listView);
}
public void setListViewHeightBasedOnChildren(ListView listView) {
//BaseAdapter为listview布局
BaseAdapter listAdapter = (BaseAdapter) listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
if(listItem != null){
listItem.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
listItem.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
totalHeight += listItem.getMeasuredHeight();
}
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1))
+ listView.getPaddingTop() + listView.getPaddingBottom();
listView.setLayoutParams(params);
}

}

适配器

package com.bawei.day06_scrollview;

import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class Adper extends BaseAdapter {
Context context;
List<String> list;
public Adper(Context context, List<String> list) {
// TODO Auto-generated constructor stub
this.context=context;
this.list=list;
}

public int getCount() {
// TODO Auto-generated method stub
return list.size();
}

public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}

public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}

public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder viewHolder;
if(convertView==null){
convertView=View.inflate(context, R.layout.listview, null);
viewHolder=new ViewHolder();
viewHolder.textView=(TextView) convertView.findViewById(R.id.text);
convertView.setTag(viewHolder);
}else{
viewHolder=(ViewHolder) convertView.getTag();
}
viewHolder.textView.setText(list.get(position));
return convertView;
}
class ViewHolder{
TextView textView;
}
}

第二种方法

自定义ListView，重载onMeasure()方法，设置全部显示

<com.bawei.day06.ListViewForScrollView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.bawei.day06.ListViewForScrollView>
</LinearLayout>
</ScrollView>

</LinearLayout>

MainActivity.java

package com.bawei.day06;

import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
private ListView listView;
private List<String> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listview);
list = new ArrayList<String>();
for (int i = 0; i < 200; i++) {
list.add(i+"");
}
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,list);

listView.setAdapter(adapter);
}

}

重写listview

ListViewForScrollView.java

package com.bawei.day06;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

public class ListViewForScrollView extends ListView {

public ListViewForScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}

@Override
/**
* 重写该方法，达到使ListView适应ScrollView的效果
*/
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}

posted @ 2016-04-14 09:36 只剩下我自己了阅读(191) 评论(0) 收藏举报

刷新页面返回顶部

洛

ScrollView中嵌套ListView

公告