Android学习笔记（四）CheckBox、RadioGroup、ProgressBar、ListView、Spinner

一、多选按钮-CheckBox

用法：首先也是通过控件ID来得到代表控件的对象，然后为其添加监听器。

设置监听器代码：

 

      //为多选按钮添加监听器
        swim.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
			
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				// TODO Auto-generated method stub
				if(isChecked)
				{
					System.out.println("swim is checked");

				}
				else
				{
					System.out.println("swim is unchecked");
				}
			}
		});

 

 其中，swimBox是CompoundButton的子类，所以他可以向上转型为CompoundButton的类型，将参数传进。

 

 

 

 

二、单选按钮-RadioGroup

用法：同CheckBox

设置监听器代码：

 

        	//单选按钮监听器
            

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				// TODO Auto-generated method stub
	      		if(female.getId()== checkedId){
        			System.out.println("你是女的");
        			Toast.makeText(checkRadio.this, "女", Toast.LENGTH_SHORT).show();
        			/**Toast用于选择时弹出提示*/
        			}else if (gender.getId()== checkedId)
        			{
        				System.out.println("你是男的");
        				Toast.makeText(checkRadio.this, "男", Toast.LENGTH_SHORT).show();
        			}
			}
        });

 

 

 

 

 

 

 

 

 

 

 

 

三、进度条-ProgressBar

.xml文件中定义如下：水平进度条

 

<ProgressBar
	android:id="@+id/firstBar"
	style="?android:attr/progressBarStyleHorizontal"
	android:layout_width="200dp"
	android:layout_height="wrap_content"
	android:visibility="gone"/是否可视的状态，gone是不可视的 


	/>

 

 默认的进度条最大值是100，如上例子，若想进度条自定义，则用：android:max="xxx"即可，也可以在代码里面设置。如：下面例子中！

 

 

Activity中实现进度条：

 

package mars.progressbar;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class ProgressBarTest extends Activity {
    /** Called when the activity is first created. */
	//声明变量
	private ProgressBar firstBar =null;
	private ProgressBar secondBar = null;
	private Button myButton = null;
	private int i = 0 ;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根据控件的ID来取得代表控件的对象
        firstBar = (ProgressBar)findViewById(R.id.firstBar);
        secondBar = (ProgressBar)findViewById(R.id.secondBar);
        myButton = (Button)findViewById(R.id.myButton);
        myButton.setOnClickListener(new ButtonListener());
    }
    class ButtonListener implements OnClickListener{
    	
		@Override
		public void onClick(View v) {
			if(i == 0)
			{
				//设置进度条处于可见的状态
				firstBar.setVisibility(View.VISIBLE);
				firstBar.setMax(150);
				secondBar.setVisibility(View.VISIBLE);
				
			}
			else if ( i < firstBar.getMax()){//获得获得进度条的最大值
				//设置主进度条的当前值
				firstBar.setProgress(i);
				//设置第二进度条的当前值
				firstBar.setSecondaryProgress(i + 10);
				//因为默认的进度条无法显示进行的状态
				secondBar.setProgress(i);
				
			}
			else{
				//设置进度条处于不可见状态
				firstBar.setVisibility(View.GONE);
				secondBar.setVisibility(View.GONE);
			}
			i = i + 10 ;
		}
    	
    }
    
}

 

 

 

 

四、列表-ListView

 

列表实现的不是Activity，而是ListActivity。

main.xml:

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
			xmlns:android="http://schemas.android.com/apk/res/android"
			android:orientation="vertical" 
			android:layout_width="fill_parent"
			android:layout_height="fill_parent">
<LinearLayout 
			android:id="@+id/listLinearLayout"
			android:layout_width="fill_parent" 
			android:layout_height="wrap_content"
			android:orientation="vertical">
<ListView 
			android:id="@id/android:list" 
			android:layout_width="fill_parent"
			android:layout_height="wrap_content" 
			android:drawSelectorOnTop="true"
			android:scrollbars="vertical" />
	</LinearLayout>
</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="10dip"
			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="5pt"
			android:singleLine="true" />
<TextView 
			android:id="@+id/user_ip" 
			android:layout_width="fill_parent"
			android:layout_height="fill_parent" 
			android:gravity="right"
			android:textSize="5pt" />
</LinearLayout>

Activity代码：

 

public class Activity01 extends ListActivity {
	/**继承于ListActivity类*/
	@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_ip", "192.168.0.1");
		map2.put("user_name", "zhangsan");
		map2.put("user_ip", "192.168.0.2");
		map3.put("user_name", "wangwu");
		map3.put("user_ip", "192.168.0.3");
		list.add(map1);
		list.add(map2);
		list.add(map3);
		MyAdapter listAdapter = new MyAdapter(this, 
				list,R.layout.user, new String[] { "user_name", "user_ip" },
				new int[] { R.id.user_name,R.id.user_ip});
		/**this即为当前这个ListActivity的对象，
		 * list关键字，将鼠标放在list上可看到ArrayList<HashMap<String, String>> list
		 * 表示为：首先它是一个ArrayList，里面放上HashMap，HashMap里又放上2个String对象
		 * R.id.uder_name是布局文件，后面一长串是数组，最后那长串是控制显示在列表中的控件布局
		 * user_name和user_ip是对应在HashMap里面的列，最后的new int[]则是对应在列中的值*/
		setListAdapter(listAdapter);
	}
}
MyAdapter是自定义方法,MyAdapter:
package mars.listview;

import java.util.List;
import java.util.Map;

import android.R.color;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;

public class MyAdapter extends SimpleAdapter {
	private LayoutInflater inflater = null;
	private List<Map<String,Object>> styles = null;
	public List<Map<String, Object>> getStyles() {
		return styles;
	}

	public void setStyles(List<Map<String, Object>> styles) {
		this.styles = styles;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		View result = super.getView(position, convertView, parent);
		System.out.println("positon---->" + position);
		if(result != null){
			inflater.inflate(R.layout.user1, null);
		}
		return result;
	}

	public MyAdapter(Context context, List<? extends Map<String, ?>> data,
			int resource, String[] from, int[] to) {
		super(context, data, resource, from, to);
		inflater = LayoutInflater.from(context);
	}

}

 
五、Spinnner
		 Spinner s1 = (Spinner) findViewById(R.id.Sp_Button_ChangeRoom);
		
		//下拉列表选择桌位号或者包厢号
        
        //将可选内容与ArrayAdapter连接
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.SP_ChangeRoom, android.R.layout.simple_spinner_item);
        
        //设置下拉列表风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        
        //将adapter添加到s1中 
        s1.setAdapter(adapter);
        //添加Spinner事件监听
        s1.setOnItemSelectedListener(new OnItemSelectedListener() {
        	        /** 第一个参数  是适配器 <?>是适配器里内容的类型，可把？改成你存的类型.
        	         *  第二个参数 是你当前选择的view
        	         *  第三个参数 是你所选项在适配器中的索引位置 
        	         *  第四个参数 选定项目的行数 
        	        */
                    public void onItemSelected(
                            AdapterView<?> parent, View view, int position, long id) {
                    	if(id>4){
                        showToast(id+1+"号包厢");
                    }else{
                    	showToast(id+1+"号桌");
                    }
                    
                }

					@Override
					public void onNothingSelected(AdapterView<?> arg0) {
						// TODO Auto-generated method stub
						showToast("没有选择桌号或者包厢号");
						
					}
					});
        }
        
	
	private void showToast(CharSequence msg) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();