ListView嵌套GridView使用详解及注意事项

mainactivity如下:

package cn.testlistviewandgridview;
import java.util.arraylist;
import java.util.hashmap;
import android.app.activity;
import android.os.bundle;
import android.widget.listview;
/**
* demo描述:
* listview嵌套gridview使用详解
* 即listview的每个item中都包含一个gridview
*
* 注意事项:
* 由于listview和gridview都是可滑动的控件.
* 所以需要自定义gridview,重写其onmeasure()方法.
* 在该方法中使gridview的高为wrap_content的大小,否则gridview中
* 的内容只能显示很小一部分
*
* 参考资料:
* 1 http://bbs.csdn.net/topics/380245627
* 2 http://blog.csdn.net/lsong89/article/details/8598856
* thank you very much
*/
public class mainactivity extends activity {
private listview mlistview;
private listviewadapter mlistviewadapter;
private arraylist<arraylist<hashmap<string,object>>> marraylist;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
init();
}
private void init(){
mlistview=(listview) findviewbyid(r.id.listview);
initdata();
mlistviewadapter=new listviewadapter(marraylist, mainactivity.this);
mlistview.setadapter(mlistviewadapter);
}
private void initdata(){
marraylist=new arraylist<arraylist<hashmap<string,object>>>();
hashmap<string, object> hashmap=null;
arraylist<hashmap<string,object>> arraylistforeverygridview;

for (int i = 0; i < 10; i++) {
arraylistforeverygridview=new arraylist<hashmap<string,object>>();
for (int j = 0; j < 5; j++) {
hashmap=new hashmap<string, object>();
hashmap.put("content", "i="+i+" ,j="+j);
arraylistforeverygridview.add(hashmap);
}
marraylist.add(arraylistforeverygridview);
}

}
}

listviewadapter如下:

package cn.testlistviewandgridview;
import java.util.arraylist;
import java.util.hashmap;
import android.content.context;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.gridview;
import android.widget.imageview;
public class listviewadapter extends baseadapter {
private arraylist<arraylist<hashmap<string, object>>> mlist;
private context mcontext;

public listviewadapter(arraylist<arraylist<hashmap<string, object>>> mlist, context mcontext) {
super();
this.mlist = mlist;
this.mcontext = mcontext;
}
@override
public int getcount() {
if (mlist == null) {
return 0;
} else {
return this.mlist.size();
}
}
@override
public object getitem(int position) {
if (mlist == null) {
return null;
} else {
return this.mlist.get(position);
}
}
@override
public long getitemid(int position) {
return position;
}
@override
public view getview(int position, view convertview, viewgroup parent) {
viewholder holder = null;
if (convertview == null) {
holder = new viewholder();
convertview = layoutinflater.from
(this.mcontext).inflate(r.layout.listview_item, null, false);
holder.imageview = (imageview) convertview.findviewbyid(r.id.listview_item_imageview);
holder.gridview = (gridview) convertview.findviewbyid(r.id.listview_item_gridview);
convertview.settag(holder);
} else {
holder = (viewholder) convertview.gettag();
}


if (this.mlist != null) {
if (holder.imageview != null) {
holder.imageview.setimagedrawable
(mcontext.getresources().getdrawable(r.drawable.e));
}
if (holder.gridview != null) {
arraylist<hashmap<string, object>> arraylistforeverygridview = this.mlist.get(position);
gridviewadapter gridviewadapter=new gridviewadapter(mcontext, arraylistforeverygridview);
holder.gridview.setadapter(gridviewadapter);
}
}
return convertview;
}

private class viewholder {
imageview imageview;
gridview gridview;
}
}

gridviewadapter如下:

package cn.testlistviewandgridview;
import java.util.arraylist;
import java.util.hashmap;
import android.content.context;
import android.view.layoutinflater;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.button;
import android.widget.toast;
public class gridviewadapter extends baseadapter{
private context mcontext;
private arraylist<hashmap<string, object>> mlist;

public gridviewadapter(context mcontext,arraylist<hashmap<string, object>> mlist) {
super();
this.mcontext = mcontext;
this.mlist = mlist;
}
@override
public int getcount() {
if (mlist == null) {
return 0;
} else {
return this.mlist.size();
}
}
@override
public object getitem(int position) {
if (mlist == null) {
return null;
} else {
return this.mlist.get(position);
}
}
@override
public long getitemid(int position) {
return position;
}
@override
public view getview(final int position, view convertview, viewgroup parent) {
viewholder holder = null;
if (convertview == null) {
holder = new viewholder();
convertview = layoutinflater.from
(this.mcontext).inflate(r.layout.gridview_item, null, false);
holder.button = (button)convertview.findviewbyid(r.id.gridview_item_button);
convertview.settag(holder);

} else {
holder = (viewholder) convertview.gettag();
}


if (this.mlist != null) {
hashmap<string, object> hashmap = this.mlist.get(position);
if (holder.button != null) {
holder.button.settext(hashmap.get("content").tostring());
holder.button.setonclicklistener(new onclicklistener() {
@override
public void onclick(view v) {
toast.maketext(mcontext, "第"+(position+1)+"个", toast.length_short).show();
}
});
}
}
return convertview;
}

private class viewholder {
button button;
}
}

noscrollgridview如下:

package cn.testlistviewandgridview;
import android.content.context;
import android.util.attributeset;
import android.widget.gridview;
public class noscrollgridview extends gridview {
public noscrollgridview(context context) {
super(context);

}
public noscrollgridview(context context, attributeset attrs) {
super(context, attrs);
}

@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
int expandspec = measurespec.makemeasurespec(integer.max_value >> 2,measurespec.at_most);
super.onmeasure(widthmeasurespec, expandspec);
}
}

main.xml如下:

<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"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:focusable="false"
/>
</relativelayout>

listview_item.xml如下:

<?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:orientation="vertical"
>
<imageview
android:id="@+id/listview_item_imageview"
android:layout_width="fill_parent"
android:layout_height="20dip"
android:scaletype="fitxy"
android:src="@drawable/e"
/>
<cn.testlistviewandgridview.noscrollgridview
android:id="@+id/listview_item_gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchmode="columnwidth"
android:verticalspacing="5dip"
android:horizontalspacing="5dip"
android:numcolumns="2"/>
</linearlayout>

gridview_item.xml如下:

<?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="horizontal"
android:padding="10dip"
>
<button
android:id="@+id/gridview_item_button"
android:layout_width="140dip"
android:layout_height="40dip"
android:background="@drawable/e"
android:textcolor="@android:color/background_light"
android:clickable="true"
/>
</linearlayout>