Android 应用软件开发（九）控件续
TextView
EditBox
Button
RadioGroup
RadioBox
CheckBox
ProgressBar
ListView
下面是关于RadioBox和CheckBox的用法
注意控件使用的顺序：
1. 什么控件变量
2. 通过控件的ID获取控件句柄
3. 绑定监听器（注意RadioGroup是使用自己定义的内部类而CheckBox是使用公用的CompoundButton的公用类）
<RadioGroup
android:id="@+id/genderGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/cancel"
android:orientation="vertical">
<RadioButton
android:id="@+id/maleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/male"
/>
<RadioButton
android:id="@+id/femaleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/female"
/>
</RadioGroup>
<CheckBox
android:id="@+id/swim"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/genderGroup"
android:text="swim"
/>
<ProgressBar
android:id="@+id/firstBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="@+id/swim"
android:max="200"
android:visibility="gone"
/>
<ProgressBar
android:id="@+id/secondBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/firstBar"
android:visibility="gone"
/>
<Button
android:id="@+id/beginButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/secondBar"
android:text="begin"
/>
genderGroup = (RadioGroup)findViewById(R.id.genderGroup);
femaleButton = (RadioButton)findViewById(R.id.femaleButton);
maleButton = (RadioButton)findViewById(R.id.maleButton);
swim = (CheckBox)findViewById(R.id.swim);
genderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
if(femaleButton.getId()==checkedId)
{
System.out.println("female");
Toast.makeText(TableTestActivity.this,"female",Toast.LENGTH_SHORT).show();
}
else if(maleButton.getId()==checkedId)
{
System.out.println("male");
}
}
});
swim.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked)
System.out.println("swim button has been selected");
else
System.out.println("swim button has not been selected");
}
});
class beginListener implements OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(0==i)
{
firstBar.setProgress(i);
//firstBar.setSecondaryProgress(i+2);
secondBar.setProgress(i);
firstBar.setVisibility(View.VISIBLE);
secondBar.setVisibility(View.VISIBLE);
}
else if(i<200)
{
firstBar.setProgress(i);
//firstBar.setSecondaryProgress(i+2);
secondBar.setProgress(i);
}
else
{
firstBar.setVisibility(View.INVISIBLE);
secondBar.setVisibility(View.INVISIBLE);
i=-10;
}
i=i+10;
}
}
ListView控件的用法比较特殊
1. 需要至少两个布局文件，一个用于窗口的整体布局，一个用于ListView内部的布局
2. 其Activity需要继承自ListActivity
见下例
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/android:list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop="false"
android:scrollbars="vertical"/>
</LinearLayout>
user.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:paddingLeft="1dip"
android:paddingRight="10dip"
android:paddingTop="1dip"
android:paddingBottom="1dip">
<TextView
android:id="@+id/user_name"
android:layout_width="180dip"
android:layout_height="30dip"
android:textSize="10pt"
android:singleLine="true"/>
<TextView
android:id="@+id/user_id"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="10pt"
android:gravity="right"/>
</LinearLayout>
Activity05.java:
package my.activity;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class Activity05 extends ListActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<HashMap<String,String>> list= new ArrayList<HashMap<String,String>>();
HashMap<String,String> map1=new HashMap<String,String>();
HashMap<String,String> map2=new HashMap<String,String>();
HashMap<String,String> map3=new HashMap<String,String>();
map1.put("user_name", "zhangsan");
map1.put("user_id", "192.168.0.1");
map2.put("user_name", "lisi");
map2.put("user_id", "192.168.0.2");
map3.put("user_name", "wangwu");
map3.put("user_id", "192.168.0.3");
list.add(map1);
list.add(map2);
list.add(map3);
SimpleAdapter listAdapter = new SimpleAdapter(this, list,
R.layout.user, new String[]{"user_name","user_id"},
new int[]{R.id.user_name,R.id.user_id});
setListAdapter(listAdapter);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
System.out.println("position~~~~~~~~~~"+position);
System.out.println("id~~~~~~~~~~~~~~~~"+id);
}
}
