ListView和GridView都是比较常用的控件，都是用来显示数据的。ListView主要用来显示列表型的数据（如播放列表），而GridView主要用来显示表格型的数据（如九宫格图）。
ListView和GridView的使用都需要用到Adapter，并且之间的用法也比较相似。
ListView的使用
activity_main.xml布局文件：
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" >
</ListView>
</RelativeLayout>
item.xml文件：
<?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" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"/>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
MainActivity.java文件：
package com.pegatron.listview;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private ListView lv;
private ArrayAdapter<String> adapter;
private SimpleAdapter sa;
private List<HashMap<String, String>> list;
private HashMap<String, String> map;
private String[] names;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv=(ListView) findViewById(R.id.listView1);
/**
* 配合arrayadapter的使用
*/
/* names=new String[]{"mike1","liz1","sasa1","osean1","mike2","liz2","sasa2","osean2","mike3","liz3","sasa3","osean3"};
adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, names);
lv.setAdapter(adapter);*/
list=new ArrayList<HashMap<String,String>>();
for(int i=0;i<50;i++){
map=new HashMap<String, String>();
map.put("textView1", "hello"+i);
list.add(map);
};
/**
* 配合simpleadapter的使用
*/
/* sa=new SimpleAdapter(this, list, R.layout.item, new String[]{"textView1"}, new int[]{R.id.textView1});
lv.setAdapter(sa);*/
/**
* 自定义的adapter
*/
lv.setAdapter(new MyAdapter());
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this, "您选择了："+position, 1).show();
}
});
}
private class MyAdapter extends BaseAdapter{
@Override
public int getCount() {
if(list!=null){
return list.size();
}else{
return 0;
}
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
HashMap<String, String> listItem=list.get(position);
View v=View.inflate(getApplicationContext(), R.layout.item, null);
TextView tv=(TextView) v.findViewById(R.id.textView1);
tv.setText(listItem.get("textView1"));
return v;
}
}
}
配合ArrayAdapter使用、配合SimpleAdapter使用、自定义的MyAdapter三种方式的运行效果图：
GridView的使用：
布局文件：
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<GridView
android:id="@+id/gridView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:numColumns="3" >
</GridView>
</RelativeLayout>
items.xml文件：
<?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" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
MainActivity.java文件：
package com.pega.gridview;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.Inflater;
import android.os.Bundle;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private GridView gv;
private MyAdapter ma;
private String[] picture=new String[]{
"picture1","picture2","picture3",
"picture4","picture5","picture6",
"picture7","picture8","picture9",
"picture10","picture11","picture12",
"picture13","picture14","picture15"};
private int[] images=new int[]{
R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,
R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gv=(GridView) findViewById(R.id.gridView1);
ma=new MyAdapter(picture,images,this);
gv.setAdapter(ma);
gv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO 自动生成的方法存根
Toast.makeText(MainActivity.this, "picture"+(position+1), Toast.LENGTH_LONG).show();
}
});
}
class MyAdapter extends BaseAdapter{
private List<Picture> lists;
public MyAdapter(){
}
public MyAdapter(String[] picture, int[] images,
MainActivity mainActivity) {
lists=new ArrayList<MainActivity.Picture>();
for(int i=0;i<images.length;i++){
Picture pic=new Picture(images[i],picture[i]);
lists.add(pic);
}
}
@Override
public int getCount() {
return lists.size();
}
@Override
public Object getItem(int position) {
// TODO 自动生成的方法存根
return lists.get(position);
}
@Override
public long getItemId(int position) {
// TODO 自动生成的方法存根
return lists.get(position).getPid();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView==null){
convertView=LayoutInflater.from(getApplicationContext()).inflate(R.layout.items, null);
ImageView iv=(ImageView) convertView.findViewById(R.id.imageView1);
TextView tv=(TextView) convertView.findViewById(R.id.textView1);
iv.setImageResource(lists.get(position).getPid());
tv.setText(lists.get(position).getPdesc());
}
return convertView;
}
}
class Picture{
private int pid;
private String pdesc;
public Picture() {
}
public Picture(int pid, String pdesc) {
super();
this.pid = pid;
this.pdesc = pdesc;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getPdesc() {
return pdesc;
}
public void setPdesc(String pdesc) {
this.pdesc = pdesc;
}
}
}
这里只是用了自定义的Adapter，运行的效果图：
另外的两种Adapter的用法跟ListView的用法类似。