android之单选框

 

Radio.java

 

package archie.android.activity; import 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 Radio extends Activity { /** * 创建TextView对象 * 创建RadioGroup对象 * 创建4个RadioButton对象 */ TextView m_TextView; RadioGroup m_RadioGroup; RadioButton m_Radio1, m_Radio2, m_Radio3, m_Radio4; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /** * 获得TextView对象 * 获得RadioGroup对象 * 获得4个RadioButton对象 */ m_TextView = (TextView) findViewById(R.id.TextView01); m_RadioGroup = (RadioGroup) findViewById(R.id.RadioGroup01); m_Radio1 = (RadioButton) findViewById(R.id.RadioButton1); m_Radio2 = (RadioButton) findViewById(R.id.RadioButton2); m_Radio3 = (RadioButton) findViewById(R.id.RadioButton3); m_Radio4 = (RadioButton) findViewById(R.id.RadioButton4); /* 设置事件监听 */ m_RadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub if (checkedId == m_Radio2.getId()) { DisplayToast("正确答案：" + m_Radio2.getText() + "，恭喜你，回答正确！"); } else { DisplayToast("请注意，回答错误！"); } } }); } /* 显示Toast */ public void DisplayToast(String str) { Toast toast = Toast.makeText(this, str, Toast.LENGTH_LONG); //设置toast显示的位置 toast.setGravity(Gravity.TOP, 0, 220); //显示该Toast toast.show(); } }

 

main.xml

 

 

String.xml

 

Android底层是基于什么操作系统？ RadioButton Windows Linux Moc os Java