Android的Listview用法总结和Adapter的使用

在Android中Listview太常用了，不多说。直接说怎么用，代码如下：

一、第一种简单实现

MainActivity.java

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.app.Activity;

public class MainActivity extends Activity {
private static String[] titles={"1","2","3","4","5","6"};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv = (ListView)findViewById(R.id.lsv);
lv.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item,R.id.text,titles));
}
}

这里有俩个布局文件，一个是整体的布局文件activity_main.xml，另一个是Listview中每条的样式的布局文件list_item.xml.

activity_main.xml

<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/lsv"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</ListView>

</RelativeLayout>

list_item.xml

<LinearLayout 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" >
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>

</LinearLayout>

部署显示ok。

二、第二种简单实现，和第一种差不多。SimpleAdapter中可以适配文本和图片，代码如下：

MainActivity.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv = (ListView)findViewById(R.id.lsv);
List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
for(int i=0;i<5;i++){
Map<String, Object> map = new HashMap<String, Object>();
map.put("id", i);
map.put("title", "+++++++++++++"+i);
data.add(map);
}
lv.setAdapter(new SimpleAdapter(this, data, R.layout.list_item, new String[]{"id","title"}, new int[]{R.id.text,R.id.title}));
}
}

用到的布局文件

activity_main.xml

<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/lsv"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
</ListView>

</RelativeLayout>

list_item.xml

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

</LinearLayout>

三、自定义Adapter类继承BaseAdapter，java代码如下：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
List<Map<String, Object>> data;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView)findViewById(R.id.lsv);
data = new ArrayList<Map<String,Object>>();
for(int i=0;i<5;i++){
Map<String, Object> map = new HashMap<String, Object>();
map.put("id", i);
map.put("title", "+++++++++++++"+i);
data.add(map);
}
lv.setAdapter(new MyAdapter());
}

private class MyAdapter extends BaseAdapter{

@Override
public int getCount() {//list里面总共的条目
// TODO Auto-generated method stub
return data.size();
}

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {//实现显示每条数据
// TODO Auto-generated method stub
Map<String, Object> map = data.get(position);
View view = View.inflate(MainActivity.this, R.layout.list_item, null);
((TextView)view.findViewById(R.id.text)).setText(map.get("id")+"");
((TextView)view.findViewById(R.id.title)).setText(map.get("title")+"");
return view;
}

}
}

布局文件和上面一样。运行OK