一：编辑框
在res文件夹下的layout的文件夹的xml文件
这样在xml中我们就声明了两个控件，一个EditText和一个TextView
<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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="24dp"
android:ems="10" >
<requestFocus />
</EditText>
</RelativeLayout>
并且我们将为EditText控件添加事件监听setOnKeyListener,并实现了onKey方法--在这个项目中也就是用户在按键是变回触发这个事件，从而可以通过getText()方法来获取用户输入的内容，当然，用户在没有输入的默认情况下，编辑框EditText默认显示“输入账号”，实现这个功能的方法为Edit.SetHint(“请输入账号！”)或者在xml布局上写上“android:hit=”请输入账号！””，
代码为
package com.example.test;
import android.os.Bundle;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView m_texTextView;
private EditText m_EditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
m_texTextView=(TextView)findViewById(R.id.textView1);
m_EditText=(EditText)findViewById(R.id.editText1);
m_EditText.setHint("请输入账号:");
m_EditText.setOnKeyListener(new EditText.OnKeyListener(){
@Override
public boolean onKey(View arg0,int arg1,KeyEvent arg2){
m_texTextView.setText("文本框中的内容是:"+m_EditText.getText().toString());
return false;
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
二：Spinner控件
1.在Activity中自定数据的绑定方式
private static final String[] m={"A型","B型","O型","AB型","其他"};
private ArrayAdapter<String> adapter;
在Oncrete方法中做各种实例化spinner
setContentView(R.layout.activity_main);
Spinner spinner = (Spinner) findViewById(R.id.planets_spinner); adapter=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new SpinnerSelectedListener());
spinner.setVisibility(View.VISIBLE);
实现事件的注册
class SpinnerSelectedListener implements OnItemSelectedListener{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "你的血型是："+m[arg2], 1).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
2.在vlues文件夹中定义arrays.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="plantes">
<item>NOKIA</item>
<item>MOTO</item>
<item>HTC</item>
<item>LG</item>
<item>其他</item>
</string-array>
</resources>
private ArrayAdapter adapter2;
rotected void onCreate(Bundle savedInstanceState) {
adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter2);
spinner1.setOnItemSelectedListener(new SpinnerXMLSelectedListener());
}
class SpinnerXMLSelectedListener implements OnItemSelectedListener{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "你使用什么样的手机："+adapter2.getItem(arg2), 1).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
注意两种方法分别给adater绑定数据的不同，而且simper_spinner_dropdown_item系统默认的layout方式
三：listView控件
1.使用listview对数据进行简单的绑定,这里使用Arrayadater适配器进行简单的数据绑定
public class MainActivity extends Activity {
private ListView listView;
private ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView)this.findViewById(R.id.listView1);
adapter=new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1, getDataSourece());
listView.setAdapter(adapter);
}
public List<String> getDataSourece() {
List<String> list=new ArrayList<String>();
for(int i =0;i<30;i++){
list.add("bibly"+i);
}
return list;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
2.自定义listview控件
1.使用SimpleAdapter+ListView
SimpleAdapter其中一个构造函数如下：
public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)
第一个参数：当前上下文对象。第二个参数：一个List类型的泛型集合，泛型类型必须继承之Map类型。第三个：布局资源的ID，
第四个参数：需要绑定的Key列表。第五个参数：与Key列表项对应的资源文件中的具体组件ID集合。
自定义一个布局文件image.xml
<?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">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/img">
</ImageView>
<TextView
android:id="@+id/txtName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</TextView>
<TextView
android:paddingLeft="20sp"
android:id="@+id/txtLength"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</TextView>
</LinearLayout>
package com.example.mytestxml;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.example.mytestxml.R.id;
import com.example.mytestxml.R.string;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class MainActivity extends Activity {
private ListView listView;
private ArrayAdapter<String> adapter;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(ListView)this.findViewById(R.id.listView1);
button=(Button)this.findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String []from={"img","name","length"};
int[]to={R.id.img,R.id.txtName,R.id.txtLength};
SimpleAdapter adapter=new SimpleAdapter(MainActivity.this,getData(),
R.layout.image, from, to);
listView.setAdapter(adapter);
}
});
adapter=new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_list_item_1, getDataSourece());
listView.setAdapter(adapter);
}
public List<Map<String, Object>> getData() {
List<Map<String,Object>> lists=new ArrayList<Map<String,Object>>();
for(int i=0;i<4;i++){
Map<String,Object> map=new HashMap<String,Object>();
map.put("img", R.drawable.ic_launcher);
map.put("name", "SimpleAdapter"+i);
map.put("length", "300");
lists.add(map);
}
return lists;
}
public List<String> getDataSourece() {
List<String> list=new ArrayList<String>();
for(int i =0;i<30;i++){
list.add("bibly"+i);
}
return list;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
2.使用SimpleAdapter
activity_main.xml下更改代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView android:id="@+id/picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dip"/>
<LinearLayout android:orientation="vertical"
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"
android:textColor="#16CCDD"
android:textSize="22sp" />
<TextView android:id="@+id/info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#666666"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
更改MainActivity.java
public class MainActivity extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SimpleAdapter adapter = new SimpleAdapter(this,getData(),
R.layout.activity_main,
new String[]{"title","info","picture"},
new int[]{R.id.title,R.id.info,R.id.picture});
setListAdapter(adapter);
}
private List<Map<String, Object>> getData() {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map = new HashMap<String, Object>();
map.put("title", "图片");
map.put("info", "美辰良景，给你无限的遐思，让人感觉无限温馨……");
map.put("picture", R.drawable.ic_launcher);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "音乐");
map.put("info", "轻曼音乐，令人如入仙境，如痴如醉……");
map.put("picture", R.drawable.ic_launcher);
list.add(map);
map = new HashMap<String, Object>();
map.put("title", "视频");
map.put("info", "震撼场景，360度的视觉捕获，一览无遗……");
map.put("picture", R.drawable.ic_launcher);
list.add(map);
return list;
}
}
注意这里的MainActivity extends ListActivity ，ListActivity和普通的Activity没有太大的差别，不同就是对显示ListView做了许多优化，方面显示而已。
3.使用SimpleAdapter+ListView读取xml数据并访问(使用dom解析的方式读取xml数据)
定义的xml数据
<?xml version="1.0" encoding="utf-8"?> <channel> <item id="0" url="http://www.baidu.com">百度</item> <item id="1" url="http://www.qq.com">腾讯</item> <item id="2" url="http://www.sina.com.cn">新浪</item> <item id="3" url="http://www.taobao.com">淘宝</item> </channel>
定义对应的类来读取数据
public class channel {
private String id;
private String url;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
定义读取xml读取数据的类(使用Dom方式)
ublic class DomParserHelper {
public static List<channel> getChannelList(InputStream stream)
{
List<channel> list=new ArrayList<channel>();
//得到 DocumentBuilderFactory 对象, 由该对象可以得到 DocumentBuilder 对象
DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
try {
//得到DocumentBuilder对象
DocumentBuilder builder=factory.newDocumentBuilder();
//得到代表整个xml的Document对象
Document document=builder.parse(stream);
//得到 "根节点"
Element root=document.getDocumentElement();
//获取根节点的所有items的节点
NodeList items=root.getElementsByTagName("item");
//遍历所有节点
for(int i=0;i<items.getLength();i++)
{
channel chann=new channel();
Element item=(Element)items.item(i);
chann.setId(item.getAttribute("id"));
chann.setUrl(item.getAttribute("url"));
chann.setName(item.getFirstChild().getNodeValue());
list.add(chann);
}
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}
private List<Map<String, String>> getData2() {
List<Map<String, String>> list = new ArrayList<Map<String, String>>();
InputStream stream = getResources().openRawResource(R.raw.channels);
List<channel> channlist = DomParserHelper.getChannelList(stream);
for (int i = 0; i < channlist.size(); i++) {
Map<String, String> map = new HashMap<String, String>();
channel chann = (channel) channlist.get(i);
map.put("id", chann.getId());
map.put("url", chann.getUrl());
map.put("name", chann.getName());
list.add(map);
}
return list;
}
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String []from={"id","name","url"};
int[]to={R.id.id,R.id.name,R.id.url};
SimpleAdapter adapter = new SimpleAdapter(MainActivity.this,getData2(),
R.layout.myxml, from, to);
listView.setAdapter(adapter);
}
});
时间： 2024-12-11 04:02:49