Android界面组件基本用法

checkBox.setOnCheckedChangeListener( new OnCheckedChangeListener(){
	public void onCheckedChanged( CompoundButton buttonView, Boolean isChecked ){
		if( checkbox.isChecked() ){
			checkbox.getText();
}
}
} )

final Chronometer ch = (Chronometer)findViewById(R.id.test); //获取计时器组件
Button start = (Button)findViewById(R.id.start); //获取“开始”按钮
start.setOnClickListener(new OnClickListener(){
			public void onClick(View source)
			{
				//设置开始计时时间
				ch.setBase(SystemClock.elapsedRealtime());
				//启动计时器
				ch.start();				
			}
});	
ch.setOnChronometerTickListener(new OnChronometerTickListener(){
			public void onChronometerTick(Chronometer ch)
			{
				//如果从开始计时到现在超过了20s。
				if(SystemClock.elapsedRealtime() - ch.getBase() > 20 * 1000)
						ch.stop();
			}
});

<Spinner
	……
	android:entries=”@string/books”
/>

<resources>
	<string name="books">
		<item>疯狂Java讲义</item>
		<item>疯狂Ajax讲义</item>
		<item>疯狂XML讲义</item>
	</string-array>
 </resources>

		BaseAdapter ba = new BaseAdapter()
		{
			public int getCount(){	return 10;	}
			public Object getItem(int position){	return null;	}
			public long getItemId(int position){	return 0;		}
			//上面三个函数都是继承的虚函数
			//重写该方法，该方法返回的View将作为列表框的每项
			public View getView(int position, View convertView, ViewGroup parent) 
			{
				//创建一个LinearLayout，并向其中添加组件
				LinearLayout line = new LinearLayout(SpinnerTest2.this);
				TextView text = new TextView(SpinnerTest2.this);
				line.addView(text);
				//返回LinearLayout实例
				return line;
			}		
		};
		Spinner spinner = (Spinner)findViewById(R.id.test);
		spinner.setAdapter(ba);

		//获取当前的年、月、日、小时、分钟
		Calendar c = Calendar.getInstance();
		year = c.get(Calendar.YEAR);
		month = c.get(Calendar.MONTH);
		day = c.get(Calendar.DAY_OF_MONTH);
		hour = c.get(Calendar.HOUR);
		minute = c.get(Calendar.MINUTE);
		//初始化DatePicker组件，初始化时指定监听器
		datePicker.init(year , month ,day , new OnDateChangedListener()
		{
			@Override
			public void onDateChanged(DatePicker arg0, int year, int month, int day)
			{
				ChooseDate.this.year = year;
				ChooseDate.this.month = month;
				ChooseDate.this.day = day;
				//显示当前日期、时间
				showDate(year, month , day , hour, minute);
			}
		});
		//为TimePicker指定监听器
		timePicker.setOnTimeChangedListener(new OnTimeChangedListener()
		{
			@Override
			public void onTimeChanged(TimePicker arg0, int hour, int minute)
			{
				ChooseDate.this.hour = hour;
				ChooseDate.this.minute = minute;
				//显示当前日期、时间
				showDate(year, month , day , hour, minute);
			}
		});

//创建一个ArrayAdapter，封装数组
ArrayAdapter<String> aa = new ArrayAdapter<String>(
			this,
			android.R.layout.simple_dropdown_item_1line,
			books);				// books是String数组
AutoCompleteTextView actv = (AutoCompleteTextView)findViewById(R.id.auto);
		//设置Adapter
actv.setAdapter(aa);

实例：
	public void onCreate(Bundle savedInstanceState)
	{
		final ProgressBar bar = (ProgressBar) findViewById(R.id.bar);
		//创建一个负责更新的进度的Handler
		final Handler mHandler = new Handler()
		{
			public void handleMessage(Message msg)
			{
				if (msg.what == 0x111)
					bar.setProgress(status);
			}
		};
		//启动线程来执行任务
		new Thread()
		{
			public void run()
			{
				while (status < 100)
				{
					// 获取耗时操作的完成百分比
					status = doWork();
					// 发送消息到Handler
					Message m = new Message();
					m.what = 0x111;
					// 发送消息
					mHandler.sendMessage(m);
				}
			}
		}.start();
	}
	//模拟一个耗时的操作。
	public int doWork()
	{
		//为数组元素赋值
		data[hasData++] = (int)(Math.random() * 100);
		try
		{
			Thread.sleep(100);
		}
		catch (InterruptedException e)
		{
			e.printStackTrace();
		}
		return hasData;
	}

实例：
TabHost tabHost = getTabHost();或者findViewById也行，不过后面要有tabHost.setup();
		//设置使用TabHost布局
LayoutInflater.from(this).inflate(R.layout.main, tabHost.getTabContentView(), true);
		//添加第一个标签页
tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("已接电话").setContent(R.id.tab01)); 
		//添加第二个标签页，在标签标题上放置图标
tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("呼出电话" , 
		getResources().getDrawable(R.drawable.icon)).setContent(R.id.tab02)); 
		//添加第三个标签页
tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("未接电话").setContent(R.id.tab03)); 

		is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
		is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
		is.setFactory(new ViewFactory(){
			@Override
			public View makeView() {
				// TODO Auto-generated method stub
				return iv;
			}
		});

		ListView list2 = (ListView)findViewById(R.id.list2);
		//定义一个数组
		String[] arr ={"孙悟空" , "猪八戒" , "牛魔王"};
		//将数组包装ArrayAdapter
		ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
			this , android.R.layout.simple_list_item_1 , arr);
		//为ListView设置Adapter
		list2.setAdapter(arrayAdapter);	

AlertDialog ad = new AlertDialog.Builder(MainActivity.this).create();
ad.setIcon(R.drawable.a);
ad.setTitle("系统提示： ");
ad.setMessage("带取消、中立和确定按钮的对话框！");
ad.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener(){
		@Override
		public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
			Toast.makeText(MainActivity.this, "。。。", Toast.LENGTH_SHORT).show();
			}
		});
});
ad.show();

final NotificationManager nM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
Notification notify = new Notification(R.drawable.<id>, “显示通知”, System.currentTimeMillis());
nM.notify(NOTIFY,notify);				//NOTIFY是一个自己定义的ID