猜猜我在想什么（RadioButtonID）

新建一个继承Activity类的RadioButtonIDActivity，并设置布局文件为：radiobuttonid.xml。

添加布局文件：

 

   <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/ageofxia"

        android:textSize="22sp"/>

 

    <RadioGroup

        android:id="@+id/radiobuttonid_radiogroup"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content">

 

        <RadioButton

            android:id="@+id/radiobuttonid_rbtn01"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/twentyone"/>

 

        <RadioButton

            android:id="@+id/radiobuttonid_rbtn02"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/twentytwo"/>

 

        <RadioButton

            android:id="@+id/radiobuttonid_rbtn03"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/twentythree"/>

    </RadioGroup>

 

    <Button

        android:id="@+id/radiobutton_btn01"

        style="@android:style/Widget.Button.Inset"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/sure"

        android:textSize="22sp"/>

 

 

    <Button

        android:id="@+id/radiobutton_btn02"

        style="@android:style/Widget.Button.Inset"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/clear"

        android:textSize="22sp"/>

 

    <TextView

        android:id="@+id/radiobutton_tv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="22sp"/>

 

在代码中修改：

 

package lyx.feng.second;

 

import java.util.Random;

 

import lyx.feng.simpletextdemo.R;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

import android.widget.TextView;

 

public class RadioButtonIDActivity extends Activityimplements

       OnCheckedChangeListener, OnClickListener {

    private TextViewtv = null;

    private RadioGroupgroup = null;

    private Buttonbtn01 = null;

    private Buttonbtn02 = null;

    private int item[] = { R.id.radiobuttonid_rbtn01,

           R.id.radiobuttonid_rbtn02, R.id.radiobuttonid_rbtn03, };

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       super.setContentView(R.layout.radiobuttonid);

       this.tv = (TextView)super.findViewById(R.id.radiobutton_tv);

       this.group = (RadioGroup)super

              .findViewById(R.id.radiobuttonid_radiogroup);

       this.btn01 = (Button)super.findViewById(R.id.radiobutton_btn01);

       this.btn02 = (Button)super.findViewById(R.id.radiobutton_btn02);

       this.group.setOnCheckedChangeListener(this);

       this.btn01.setOnClickListener(this);

       this.btn02.setOnClickListener(this);

    }

 

    @Override

    public void onCheckedChanged(RadioGroup group, int checkedId) {

 

    }

 

    @Override

    public void onClick(View v) {

       switch (v.getId()) {

       case R.id.radiobutton_btn01:

           int random =new Random().nextInt(3);

           RadioButton temp = (RadioButton) findViewById(this.group

                  .getCheckedRadioButtonId());

           //没有选择就不要继续点了

           if (temp ==null) {

              return;

           }

           RadioButton temp2 = (RadioButton) findViewById(item[random]);

           this.tv.setText("你选择的是：" + temp.getText() + ",答案是："

                  + temp2.getText());

           break;

       case R.id.radiobutton_btn02:

           this.group.clearCheck();

           this.tv.setText("");

           break;

       }

    }

}