学步园

Radio.java

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

main.xml

<?xml version="1.0" encoding="utf-8"?><br /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"<br /> android:orientation="vertical"<br /> android:layout_width="fill_parent"<br /> android:layout_height="fill_parent"<br /> ><br /> <TextView<br /> android:id="@+id/TextView01"<br /> android:layout_width="fill_parent"<br /> android:layout_height="wrap_content"<br /> android:text="@string/hello"<br /> /><br /> <RadioGroup<br /> android:id="@+id/RadioGroup01"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:orientation="vertical"<br /> android:layout_x="3px"<br /> android:layout_y="54px"<br /> ><br /> <RadioButton<br /> android:id="@+id/RadioButton1"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:text="@string/RadioButton1"<br /> /><br /> <RadioButton<br /> android:id="@+id/RadioButton2"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:text="@string/RadioButton2"<br /> /><br /> <RadioButton<br /> android:id="@+id/RadioButton3"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:text="@string/RadioButton3"<br /> /><br /> <RadioButton<br /> android:id="@+id/RadioButton4"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:text="@string/RadioButton4"<br /> /><br /> </RadioGroup><br /> </LinearLayout><br />

String.xml

<?xml version="1.0" encoding="utf-8"?><br /> <resources><br /> <string name="hello">Android底层是基于什么操作系统？</string><br /> <string name="app_name">RadioButton</string><br /> <string name="RadioButton1">Windows</string><br /> <string name="RadioButton2">Linux</string><br /> <string name="RadioButton3">Moc os</string><br /> <string name="RadioButton4">Java</string><br /> </resources><br />