android之组件2

第一：

Spinner是一个列表选择框，但其并不需要显示下拉列表，二十相当于一个菜单供用户选择，下面用一个例子介绍：

在样式文件中：

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="请选择一项运动项目"
/>
<Spinner
android:id="@+id/sportsSp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:prompt="@string/spinner_prompt"
android:entries="@array/sports"
/>
</LinearLayout>

<?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" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="请选择一项运动项目" /> <Spinner android:id ="@+id/sportsSp" android:layout_width="match_parent" android:layout_height="wrap_content" android:prompt="@string/spinner_prompt" android:entries="@array/sports" /> </LinearLayout>

在<Spinner>标签中，通过android：prompt来设置弹出选择框的标题，通过android：entries来设置默认的列表选项（定义在一个arrays.xml文件中）

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<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<string-arrayname="sports">
<item>足球</item>
<item>篮球</item>
<item>乒乓球</item>
<item>网球</item>
</string-array>
</resources>

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packagecn.class3g.activity;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.AdapterView.OnItemSelectedListener;
importandroid.widget.Spinner;
importandroid.widget.TextView;
publicclassSpinnerDemoextendsActivityimplementsOnItemSelectedListener{
SpinnersportSp=null;
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner_layout);
findViews();
}
privatevoidfindViews(){
sportSp=(Spinner)this.findViewById(R.id.sportsSp);
sportSp.setOnItemSelectedListener(this);
sportSp.performClick();
}
//每选择一次均以日志输出形式打印
publicvoidonItemSelected(AdapterView<?>arg0,Viewarg1,intarg2,
longarg3){
TextViewtv=(TextView)arg1;
Log.i("TAG",tv.getText().toString());
}
publicvoidonNothingSelected(AdapterView<?>arg0){
}
}

package cn.class3g.activity; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.Spinner; import android.widget.TextView; public class SpinnerDemo extends Activity implements OnItemSelectedListener{ Spinner sportSp = null; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.spinner_layout); findViews(); } private void findViews() { sportSp = (Spinner)this.findViewById(R.id.sportsSp); sportSp.setOnItemSelectedListener(this); sportSp.performClick(); } //每选择一次均以日志输出形式打印 public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { TextView tv = (TextView) arg1; Log.i("TAG", tv.getText().toString()); } public void onNothingSelected(AdapterView<?> arg0) { } }
在模拟器中的效果与日志输出结果：

android之组件2_第1张图片

第二：

ListView列表视图，为列表添加列表项有两种方法，下面用一个列子分别介绍：

在样式文件中：

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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="名单："
/>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:entries="@array/sports"
android:divider="#00FF00"
/>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/nameList"
android:divider="#00FF00"
/>
</LinearLayout>

<?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" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="名单：" /> <ListView android:layout_width="fill_parent" android:layout_height="wrap_content" android:entries="@array/sports" android:divider="#00FF00" /> <ListView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/nameList" android:divider="#00FF00" /> </LinearLayout>
在上面的布局中定义了两个ListView，第一个ListView通过android:entries指定了列表的项数组：

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<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<string-arrayname="sports">
<item>足球</item>
<item>篮球</item>
<item>乒乓球</item>
<item>网球</item>
</string-array>
</resources>

<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="sports" > <item>足球</item> <item>篮球</item> <item>乒乓球</item> <item>网球</item> </string-array> </resources>
第二个ListView通过ArrayAdapter适配器使用数组来确定列表项，并监听点击事件，每点击用日志输出打印：

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packagecn.class3g.activity;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.AdapterView.OnItemClickListener;
importandroid.widget.ArrayAdapter;
importandroid.widget.ListView;
publicclassListViewDemoextendsActivity
implementsOnItemClickListener{
ListViewnameList=null;
String[]names={"张三","李四","王五","宋六","猪八"};
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
this.setContentView(R.layout.list_layout);
findViews();
}
privatevoidfindViews(){
nameList=(ListView)this.findViewById(R.id.nameList);
//定义一个适配器，同时将定义列表项的数组添加进去
ArrayAdapteradapter=newArrayAdapter(this,
android.R.layout.simple_list_item_1,names);
nameList.setAdapter(adapter);
//为列表添加监听事件
nameList.setOnItemClickListener(this);
}
//覆盖监听器接口OnItemClickListener的抽象方法通过日志打印所点击的列表项信息
publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,longarg3){
Log.i("TAG",names[arg2]
+"position="+String.valueOf(arg2)
+"row_id="+String.valueOf(arg3));

第三：

Spinner是一个列表选择框，但其并不需要显示下拉列表，二十相当于一个菜单供用户选择，下面用一个例子介绍：

在样式文件中：

view plain copy to clipboard print ?

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="请选择一项运动项目"
/>
<Spinner
android:id="@+id/sportsSp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:prompt="@string/spinner_prompt"
android:entries="@array/sports"
/>
</LinearLayout>

在<Spinner>标签中，通过android：prompt来设置弹出选择框的标题，通过android：entries来设置默认的列表选项（定义在一个arrays.xml文件中）

view plain copy to clipboard print ?

<?xmlversion="1.0"encoding="utf-8"?>
<resources>
<string-arrayname="sports">
<item>足球</item>
<item>篮球</item>
<item>乒乓球</item>
<item>网球</item>
</string-array>
</resources>

view plain copy to clipboard print ?

packagecn.class3g.activity;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.AdapterView.OnItemSelectedListener;
importandroid.widget.Spinner;
importandroid.widget.TextView;
publicclassSpinnerDemoextendsActivityimplementsOnItemSelectedListener{
SpinnersportSp=null;
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner_layout);
findViews();
}
privatevoidfindViews(){
sportSp=(Spinner)this.findViewById(R.id.sportsSp);
sportSp.setOnItemSelectedListener(this);
sportSp.performClick();
}
//每选择一次均以日志输出形式打印
publicvoidonItemSelected(AdapterView<?>arg0,Viewarg1,intarg2,
longarg3){
TextViewtv=(TextView)arg1;
Log.i("TAG",tv.getText().toString());
}
publicvoidonNothingSelected(AdapterView<?>arg0){
}
}

android之组件2_第2张图片

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