android第六次课 UI2设计.docx

1、android第六次课 UI2设计第五次课 UI（2）5.单选按钮RadioButtonRadioButton的单选按钮;RadioGroup是单选组合框，用于将RadioButton框起来；在没有RadioGroup的情况下，RadioButton可以全部都选中；当多个RadioButton被RadioGroup包含的情况下，RadioButton只可以选择一个；单选按钮的事件监听用setOnCheckedChangeListener来对单选按钮进行监听Strings.xml 哪个城市叫做山城？ 单选按钮测试 杭州 成都 重庆 苏州Main.xml package nynu.edu.sy;i

2、mport android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.TextView;import android.widget.Toast;public class UisyActivity extends Activity TextView textview; RadioGroup radiogroup; RadioButt

3、on radio1, radio2, radio3, radio4; public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); textview = (TextView) findViewById(R.id.textview1); radiogroup = (RadioGroup) findViewById(R.id.radiogroup1); radio1 = (RadioButton) findViewById(R.id

4、.radiobutton1); radio2 = (RadioButton) findViewById(R.id.radiobutton2); radio3 = (RadioButton) findViewById(R.id.radiobutton3); radio4 = (RadioButton) findViewById(R.id.radiobutton4); radiogroup .setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() public void onCheckedChanged(RadioGr

5、oup group, int checkedId) if (checkedId = radio3.getId() DisplayToast(正确答案： + radio2.getText() + ，恭喜你，回答正确！); else DisplayToast(请注意，回答错误！); ); public void DisplayToast(String str) Toast toast = Toast.makeText(this, str, Toast.LENGTH_LONG); toast.setGravity(Gravity.TOP, 0, 220); toast.show(); 6. Chec

6、kBox复选框多选按钮CheckBox的可以实现多项选择，我们可以现在布局文件中定义多选按钮，然后对每一个多选按钮进行事件监听setOnCheckedChangeListener，通过isChecked来判断选项是否被选中 调查：你喜欢Android的那款手机？ CheckBoxTest HTC desire HD Google nexus one HTC defy 摩托罗拉里程碑IIpackage nynu.edu.sy;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;impor

7、t android.view.View;import android.view.View.OnClickListener;import android.widget.CompoundButton;import android.widget.Button;import android.widget.CheckBox;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.wid

8、get.TextView;import android.widget.Toast;public class TextViewSyActivity extends Activity /* Called when the activity is first created. */ private TextView textview;private Button submit;private CheckBox checkbox1,checkbox2,checkbox3,checkbox4;private String s=null; Override public void onCreate(Bun

9、dle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.main); textview=(TextView)findViewById(R.id.textview); submit=(Button)findViewById(R.id.submit); submit.setOnClickListener(new OnClickbt(); /取得每一个CheckBox对象 checkbox1=(CheckBox)findViewById(R.id.checkbox1); checkbox2

10、=(CheckBox)findViewById(R.id.checkbox2); checkbox3=(CheckBox)findViewById(R.id.checkbox3); checkbox4=(CheckBox)findViewById(R.id.checkbox4); /为每一个选项设置监听 checkbox1.setOnCheckedChangeListener(new OnCheckchange(); checkbox2.setOnCheckedChangeListener(new OnCheckchange(); checkbox3.setOnCheckedChangeLis

11、tener(new OnCheckchange(); checkbox4.setOnCheckedChangeListener(new OnCheckchange(); private class OnCheckchange implements CheckBox.OnCheckedChangeListener public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) if(checkbox1.isChecked() s=s+checkbox1.getText()+ ; else if(checkbox

12、2.isChecked() s=s+checkbox2.getText()+ ; else if(checkbox3.isChecked() s=s+checkbox3.getText()+ ; else if(checkbox4.isChecked() s=s+checkbox4.getText()+ ; private class OnClickbt implements OnClickListener public void onClick(View v) DisplayToast(s); public void DisplayToast(String str) Toast toast=

13、Toast.makeText(this, str, Toast.LENGTH_SHORT); /设置Toast的显示位置 toast.setGravity(Gravity.TOP, 0, 220); /显示Toast toast.show(); 7.下拉列表框Spinner1）采用xml建立下拉列表数据，setOnItemSelectedListener进行监听。在values下建立intersts.xml，存放下拉列表的数据内容 篮球 排球 足球 strings.xmlHello World, Activity01!xh_spinner_test您喜欢的球类运动是：main.xmlJava程

14、序package nynu.edu.sy;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;import android

15、.widget.Toast;public class UisyActivity extends Activity private Spinner interestspinner=null; private TextView info=null; protected void onCreate(Bundle savedInstanceState) / TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.main); interestspinner=(Spi

16、nner) this.findViewById(R.id.instersting); info=(TextView) this.findViewById(R.id.TextView01); interestspinner.setOnItemSelectedListener(new nItemSelectedListenerImp(); private class nItemSelectedListenerImp implements OnItemSelectedListener public void onItemSelected(AdapterView arg0, View arg1, in

17、t arg2, long arg3) / TODO Auto-generated method stub String values=arg0.getItemAtPosition(arg2).toString(); Toast.makeText(UisyActivity.this, 您喜欢的球类运动是：+values, 1).show(); public void onNothingSelected(AdapterView arg0) / TODO Auto-generated method stub 2）首先需要在布局中定时Spinner组件，然后将可选内容通过ArrayAdapter和下拉列表连接起来，最后要获得用户选择的选项，设计事件监听器setOnItemSelectedListener并实现onItemSelected，从而获得用户所选择的内容，最后通过setVisibility方法设置当前的显示项LinearLayout xmlns:android= android:orientation=vertical android:layout_width=fill_parent android:layout_heig