Android为ListView的Item设置不同的布局_安卓软件开发教程-查字典教程网
Android为ListView的Item设置不同的布局
Android为ListView的Item设置不同的布局
发布时间:2015-06-06 来源:查字典编辑
摘要:MainActivity如下:packagecc.testlistview;importjava.util.ArrayList;import...

MainActivity如下:

package cc.testlistview;

import java.util.ArrayList;

import java.util.HashMap;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

import android.app.Activity;

/**

* Demo描述:

* 为ListView的Item设置不同的布局.

* 例如在该例子中ListView的第一个Item显示一张

* 图片,其余的Item都显示文字.

*

* 为了达到此目的需要重写BaseAdapter中的

* 1 getViewTypeCount()和getItemViewType(int position)方法.

* 1.1在getViewTypeCount中指定一共有几种不同的item

* 在此返回2即可.

* 1.2在getItemViewType(int position)中需要依据position的不同

* 返回不同的Type.

* 2 在getView()方法中针对不同的Type为Item设置布局

* 2.1得到当前位置(position)时的Type即代码:

* currentType= getItemViewType(position);

* 2.2依据Type的不同为Item设置布局

*

* 参考资料:

* 1 /yueyue369/article/details/6115552

* 2 /s/blog_5da93c8f0100wx4v.html

* Thank you very much

*/

public class MainActivity extends Activity {

private ListView mListView;

private HashMap

private ArrayList

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(yout.main);

init();

}

private void init(){

mArrayList=new ArrayList

mListView=(ListView) findViewById(R.id.listview);

addDataForListView();

mListView.setAdapter

(new ListViewAdapter(MainActivity.this, mArrayList, yout.othersitem, new String []{"content"}, new int []{R.id.textView}));

mListView.setOnItemClickListener(new ItemClickListenerImpl());

}

private void addDataForListView(){

for (int i = 0; i < 30; i++) {

mHashMap=new HashMap

mHashMap.put("content", "This is ---> "+i);

mArrayList.add(mHashMap);

}

}

private class ItemClickListenerImpl implements OnItemClickListener {

@Override

public void onItemClick(AdapterView parent, View view, int position,long arg) {

System.out.println("OnItemClickListener position="+position);

}

}

}

ListViewAdapter如下:

package cc.testlistview;

import java.util.List;

import java.util.Map;

import android.content.Context;

import youtInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

public class ListViewAdapter extends BaseAdapter {

private List> mArrayList;

private int resource;

private LayoutInflater mLayoutInflater;

private final int TYPE_COUNT=2;

private final int FIRST_TYPE=0;

private final int OTHERS_TYPE=1;

private int currentType;

public ListViewAdapter(Context context,List> data, int resource, String[] from,int[] to) {

this.mArrayList=data;

this.resource=resource;

mLayoutInflater=(LayoutInflater) context.getSystemService(YOUT_INFLATER_SERVICE);

}

@Override

public int getCount() {

if (mArrayList==null) {

return 0;

} else {

return (mArrayList.size()+1);

}

}

@Override

public Object getItem(int position) {

if (mArrayList==null) {

return null;

} else {

if (position>0) {

return mArrayList.get(position-1);

} else {

return mArrayList.get(position+1);

}

}

}

@Override

public long getItemId(int position) {

return position;

}

///////////////////////////////////////////////////////

@Override

public int getViewTypeCount() {

return TYPE_COUNT;

}

@Override

public int getItemViewType(int position) {

if (position==0) {

return FIRST_TYPE;

} else {

return OTHERS_TYPE;

}

}

///////////////////////////////////////////////////////

@Override

public View getView(int position, View convertView, ViewGroup parent) {

View firstItemView = null;

View othersItemView=null;

//获取到当前位置所对应的Type

currentType= getItemViewType(position);

System.out.println("type="+currentType);

if (currentType== FIRST_TYPE) {

firstItemView = convertView;

FirstItemViewHolder firstItemViewHolder=null;

if (firstItemView==null) {

System.out.println("firstItemView==null ");

firstItemView = mLayoutInflater.inflate(yout.firstitem,null);

firstItemView.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View view) {

System.out.println("=====click first item=======");

}

});

firstItemViewHolder=new FirstItemViewHolder();

firstItemViewHolder.imageView=(ImageView) firstItemView.findViewById(R.id.imageView);

firstItemView.setTag(firstItemViewHolder);

} else {

System.out.println("firstItemView!=null ");

System.out.println("111 getClass="+firstItemView.getTag().getClass().toString());

firstItemViewHolder=(FirstItemViewHolder) firstItemView.getTag();

}

if (firstItemViewHolder.imageView!=null) {

firstItemViewHolder.imageView.setImageResource(R.drawable.ic_launcher);

}

convertView=firstItemView;

} else {

othersItemView = convertView;

OthersViewHolder othersViewHolder=null;

if (othersItemView==null) {

System.out.println("othersItemView==null ");

othersItemView = mLayoutInflater.inflate(yout.othersitem,null);

othersViewHolder=new OthersViewHolder();

othersViewHolder.textView=(TextView) othersItemView.findViewById(R.id.textView);

othersItemView.setTag(othersViewHolder);

} else {

System.out.println("othersItemView!=null ");

System.out.println("222 getClass="+othersItemView.getTag().getClass().toString());

othersViewHolder=(OthersViewHolder) othersItemView.getTag();

}

if (mArrayList!=null) {

if (othersViewHolder.textView!=null) {

othersViewHolder.textView.setText((String)(mArrayList.get(position-1).get("content")));

}

}

convertView=othersItemView;

}

return convertView;

}

//第一个Item的ViewHolder

private class FirstItemViewHolder{

ImageView imageView;

}

//除第一个Item以外其余Item的ViewHolder

private class OthersViewHolder{

TextView textView;

}

}

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