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android基础入门控件详解(五)

热度:64   发布时间:2016-04-28 06:34:32.0
android基础入门控件详解(5)

一.Spinner(下拉列表):

  编码实现:先要在布局文件中定义Spinner组件,然后将可选内容通过ArrayApadter和下拉列表连接起来,最后要获得用户选择选项,要设计事件监听setOnItemSelectedListener并实现其中的onItemSelected,从而获得用户所选择的内容。

 其中ArrayAdapter适配器,它的作用是连接数据源与视图,也就是可以将数组里面的数据,在spinnner中显示。

实例:


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/textView1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="" />    <Spinner        android:id="@+id/spinner1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"           android:layout_centerHorizontal="true"         /></LinearLayout>


代码部分:

public class MainActivity extends Activity {	public static final String[] m_Countries = {"O型","A型","B型","AB型","其他"};	private TextView textView;	private Spinner spinner;	private ArrayAdapter<String>  adapter; 			@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);				textView = (TextView)findViewById(R.id.textView1);		spinner = (Spinner)findViewById(R.id.spinner1);		//将可选内容与ArrayAdapter连接		adapter = new  ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);         //设置下拉列表风格		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);		//将adapter添加到spinner中	    spinner.setAdapter(adapter);	    spinner.setOnItemSelectedListener(new OnItemSelectedListener() {			@Override			public void onItemSelected(AdapterView<?> arg0, View arg1,					int arg2, long arg3) {			 				displayToast("你选中了"+m_Countries[arg2]);				textView.setText("你的血型是:"+m_Countries[arg2]);				//设置显示当前选择的项				arg0.setVisibility(View.VISIBLE);			}			@Override			public void onNothingSelected(AdapterView<?> arg0) {				// TODO Auto-generated method stub			}		});	}	public void displayToast(String text){		Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();	}	@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;	}}


运行界面:

当选中血型之后会有提示信息,然后将TextView中显示内容改变为选中类型。



二.AutoCompleteTextView和MultiAutoCompleteTextView(自动提示):

AutoCompleteTextView:支持基本的自动完成功能,适用在各种搜索功能中,并且可以根据自己的需求设置他的默认显示数据。

MultiAutoCompleteTextView:可支持选择多个值(在多次输入的情况下),分别用分隔符分开,并且在每个值选中的时候再次输入值时会自动去匹配,例如短信发送时,联系人的添加。

布局实现:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView" />    <AutoCompleteTextView        android:id="@+id/autoCompleteTextView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />    <MultiAutoCompleteTextView        android:id="@+id/multiAutoCompleteTextView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"         >    </MultiAutoCompleteTextView>   </LinearLayout>

代码实现:

public class MainActivity extends Activity {	public static final String[] auto = {"tiger","bull",		"horse","elephant","dog","pig","duck","bee","cat","dove","eagle","fish","whale"};	private TextView textView;	private ArrayAdapter<String> adapter ; 			@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);				textView = (TextView)findViewById(R.id.textView1);			//关联关键字		adapter = new  ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,auto);         		AutoCompleteTextView autoView = (AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);       	        //将adapter添加到AutoCompleteTextView中。		autoView.setAdapter(adapter);		MultiAutoCompleteTextView  multView = (MultiAutoCompleteTextView)findViewById(R.id.multiAutoCompleteTextView1);		//将adapter添加到MultiAutoCompleteTextView中。		multView.setAdapter(adapter);		multView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());	}		@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;	}}


运行图片:

AutoCompleteTextView:                                                              

           

 MultiAutoCompleteTextView:   

   

两着都可以通过setThreshold()方法来设置输入多少字符开始检索。其默认为2个字符。


三.DatePicker、TimePicker(日期和时间):

android中用DatePicker来实现日期,TimePicker来实现时间。

实现过程:

现在布局文件中定义DatePicker和TimePicker,然后通过Calendar类获得系统时间,接着通过init()方法将日期传递给DatePicker,并设置OnDateChangedListener来监听日期改变,当时间被改变时需要设置setOnTimeChangedListener()监听来设置时间。

布局文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="日期时间设置" />    <DatePicker        android:id="@+id/datePicker1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="#228b22" />    <TimePicker        android:id="@+id/timePicker1"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>


代码实现:

public class MainActivity extends Activity {	private TextView textview;	private DatePicker datepicker;	private TimePicker timepicker;	//java中的Calendar	Calendar c;		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);				c = Calendar.getInstance();		textview = (TextView)findViewById(R.id.textView1);				datepicker = (DatePicker)findViewById(R.id.datePicker1);		//将日记初始化为当前系统时间,并设置起监听事件		datepicker.init(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() {			@Override			public void onDateChanged(DatePicker view, int year, int monthOfYear,					int dayOfMonth) {				//当提起更改时,在这里处理。			}		});		timepicker = (TimePicker)findViewById(R.id.timePicker1);		//设置为24小时制显示		timepicker.setIs24HourView(true);		timepicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {			@Override			public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {								//时间改变时处理。自己可添加			}		});	}		@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;	}}

运行图片:





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