常用的Android(安卓)Widget组件学习③-checkbox和radiogroup的介绍和应用。

一、checkbox的介绍与应用：

多项选择(checkbox)介绍和应用
首先在main.xml中定义一个Button

<Button android:text="CheckBox" android:id="@+id/check_box_button" android:layout_width="wrap_content"android:layout_height="wrap_content"></Button>
然后再WigetDemo.java里面给该Button添加监听器

Button check_box_button=(Button) findViewById(R.id.check_box_button); check_box_button.setOnClickListener(check_box_button_listener);private Button.OnClickListener check_box_button_listener=new Button.OnClickListener(){ public void onClick(View v) { Intent intent=new Intent(); intent.setClass(WidgetDemo.this, CheckBoxActivity.class); startActivity(intent); } };

建立有一个新的CheckBoxActivity，修改其oncreate()方法，如下代码：
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTitle("CheckBoxActivity"); setContentView(R.layout.checkbox); find_and_modify_check_box_view(); }

再将其关联到checkbox.xml的布局模板上，

<?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" ><CheckBox android:text="zhao" android:id="@+id/zhao_cb" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox><CheckBox android:text="qian" android:id="@+id/qian_cb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </CheckBox><CheckBox android:text="song" android:id="@+id/song_cb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </CheckBox><CheckBox android:text="li" android:id="@+id/li_cb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </CheckBox></LinearLayout>然后在checkbox.xml中添加一个Button <Button android:text="获取checkbox的值" android:id="@+id/get_view_button" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
最后实现它的单击响应事件：

public class CheckBoxActivity extends Activity {CheckBox zhao_cb;CheckBox qian_cb;CheckBox song_cb;CheckBox li_cb;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setTitle("CheckBoxActivity");setContentView(R.layout.checkbox);find_and_modify_get_view_button();}private void find_and_modify_get_view_button() { zhao_cb = (CheckBox) findViewById(R.id.zhao_cb);qian_cb = (CheckBox) findViewById(R.id.qian_cb);song_cb = (CheckBox) findViewById(R.id.song_cb);li_cb = (CheckBox) findViewById(R.id.li_cb);Button get_view_button = (Button) findViewById(R.id.get_view_button);get_view_button.setOnClickListener(get_view_button_listener);}private Button.OnClickListener get_view_button_listener = new Button.OnClickListener() {public void onClick(View v) {String r="";/*switch (v.getId()) { case R.id.zhao_cb: r=r+zhao_cb.getText(); break; case R.id.qian_cb: r=r+","+qian_cb.getText(); case R.id.song_cb: r=r+","+song_cb.getText(); case R.id.li_cb: r=r+","+li_cb.getText(); default: break;*/if(zhao_cb.isChecked()){r=r+zhao_cb.getText();}if(qian_cb.isChecked()){r=r+","+qian_cb.getText();}if(song_cb.isChecked()){r=r+","+song_cb.getText();}if(li_cb.isChecked()){r=r+","+li_cb.getText();}setTitle("Checked: "+r);}};

运行结果如下：

二、单项选择(radiogroup)介绍和应用：
在main.xml中添加一个button

<Button android:text="RadioGroup" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"> </Button>
这个button的响应时间：

Button radio_group_button=(Button) findViewById(R.id.radio_group_button); radio_group_button.setOnClickListener(radio_group_button_listener); private Button.OnClickListener radio_group_button_listener =new Button.OnClickListener(){ public void onClick(View v) { Intent intent=new Intent(); intent.setClass(WidgetDemo.this, RadioGroupActivity.class); startActivity(intent); } };

在新建的RadioGroup当中修改其onCreate方法

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTitle("RadioGroupActivity"); setContentView(R.layout.radiogroup); mRadioGroup=(RadioGroup) findViewById(R.id.menu); Button clearButton=(Button) findViewById(R.id.clear); clearButton.setOnClickListener(this); }}
关联到radiogroup.xml上

<?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" > <RadioGroup android:id="@+id/menu" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checkedButton="@+id/xia"> <RadioButton android:text="chong" android:id="@+id/chong_rb" android:layout_width="wrap_content" android:layout_height="wrap_content"></RadioButton><RadioButton android:text="xia" android:id="@+id/xia_rb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </RadioButton><RadioButton android:text="qiu" android:id="@+id/qiu_rb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </RadioButton><RadioButton android:text="@+id/dong" android:id="@+id/dong_rb" android:layout_width="wrap_content" android:layout_height="wrap_content"> </RadioButton> </RadioGroup> <Button android:text="清除" android:id="@+id/clear" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button></LinearLayout>
最后修改RadioGroupActivity.java
public class RadioGroupActivity extends Activity implements View.OnClickListener { private RadioGroup mRadioGroup; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.radio_group); setTitle("RadioGroupActivity"); mRadioGroup = (RadioGroup) findViewById(R.id.menu); Button clearButton = (Button) findViewById(R.id.clear); clearButton.setOnClickListener(this); } public void onClick(View v) { mRadioGroup.clearCheck(); }}

更多相关文章

随机推荐