Android:RadioGroup,RadioButton

RadioGroup：如果需要实现一组可选项中选择一个，可以使用该控件来实现；

RadioButton：继承自CompoundButton,是一个单选按钮；

学习如何使用RadioGroup实现选中，获取选中项：

效果：

源代码：

reslayoutactivity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroupCategory"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="27dp" >

        <RadioButton
            android:id="@+id/radioAndroid"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Android" />

        <RadioButton
            android:id="@+id/radioSpringMVC"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SpringMVC" />

        <RadioButton
            android:id="@+id/radioStruts"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Struts" />
        
        <RadioButton
            android:id="@+id/radioHibernate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hibernate" />
    </RadioGroup>

    <TextView
        android:id="@+id/tvChoiceRadio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/radioGroupCategory"
        android:layout_marginLeft="27dp"
        android:text="" />

</RelativeLayout>

View Code

MainActivity.java

  1 package com.example.helloword;
  2 
  3 import android.app.Activity;
  4 import android.app.AlertDialog;
  5 import android.content.DialogInterface;
  6 import android.content.DialogInterface.OnClickListener;
  7 import android.os.Bundle;
  8 import android.renderscript.Script.KernelID;
  9 import android.util.Log;
 10 import android.view.KeyEvent;
 11 import android.view.Menu;
 12 import android.view.View;
 13 import android.widget.Button;
 14 import android.widget.EditText;
 15 import android.widget.ImageView;
 16 import android.widget.RadioButton;
 17 import android.widget.RadioGroup;
 18 import android.widget.TextView;
 19 
 20 public class MainActivity extends Activity {
 21     private RadioGroup radioGroupCategory;
 22     private RadioButton radioAndroid, radioSpringMVC, radioStruts,
 23             radioHibernate;
 24     private TextView tvChoiceRadio;
 25 
 26     @Override
 27     protected void onCreate(Bundle savedInstanceState) {
 28         super.onCreate(savedInstanceState);
 29         setContentView(R.layout.activity_main);
 30         
 31         this.tvChoiceRadio = (TextView) this.findViewById(R.id.tvChoiceRadio);
 32         this.radioGroupCategory = (RadioGroup) this
 33                 .findViewById(R.id.radioGroupCategory);
 34 
 35         this.radioAndroid = (RadioButton) this.findViewById(R.id.radioAndroid);
 36         this.radioSpringMVC = (RadioButton) this
 37                 .findViewById(R.id.radioSpringMVC);
 38         this.radioStruts = (RadioButton) this.findViewById(R.id.radioStruts);
 39         this.radioHibernate = (RadioButton) this
 40                 .findViewById(R.id.radioHibernate);
 41 
 42         this.radioStruts.setChecked(true);
 43 
 44         this.radioGroupCategory
 45                 .setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
 46                     @Override
 47                     public void onCheckedChanged(RadioGroup radioGroup,
 48                             int checkedRadioId) {
 49                         Log.i("test", "onCheckedChanged event fired..."
 50                                 + checkedRadioId);
 51                         Log.i("test", "Android" + R.id.radioAndroid);
 52                         Log.i("test", "SpringMVC" + R.id.radioSpringMVC);
 53                         Log.i("test", "Struts" + R.id.radioStruts);
 54                         Log.i("test", "Hibernate" + R.id.radioHibernate);
 55 
 56                         switch (checkedRadioId) {
 57                         case R.id.radioAndroid:
 58                             tvChoiceRadio.setText("checked value is Android");
 59                             break;
 60                         case R.id.radioSpringMVC:
 61                             tvChoiceRadio.setText("checked value is SpringMVC");
 62                             break;
 63                         case R.id.radioStruts:
 64                             tvChoiceRadio.setText("checked value is Struts");
 65                             break;
 66                         case R.id.radioHibernate:
 67                             tvChoiceRadio.setText("checked value is Hibernate");
 68                             break;
 69                         default:
 70                             tvChoiceRadio.setText("please choice...");
 71                             break;
 72                         }
 73 
 74 //                        if (radioAndroid.isChecked()) {
 75 //                            tvChoiceRadio.setText("..checked value is Android");
 76 //                        } else if (radioSpringMVC.isChecked()) {
 77 //                            tvChoiceRadio
 78 //                                    .setText("..checked value is SpringMVC");
 79 //                        } else if (radioStruts.isChecked()) {
 80 //                            tvChoiceRadio.setText("..checked value is Struts");
 81 //                        } else if (radioHibernate.isChecked()) {
 82 //                            tvChoiceRadio
 83 //                                    .setText("..checked value is Hibernate");
 84 //                        }
 85                     }
 86                 });
 87 
 88     }
 89 
 90     @Override
 91     public boolean onCreateOptionsMenu(Menu menu) {
 92         // Inflate the menu; this adds items to the action bar if it is present.
 93         getMenuInflater().inflate(R.menu.main, menu);
 94         return true;
 95     }
 96 
 97     @Override
 98     public boolean onKeyUp(int keyCode, KeyEvent event) {
 99         // 当点击回退时，弹出该窗口（也就相当于关闭操作）
100         if (keyCode == KeyEvent.KEYCODE_BACK) {
101             new AlertDialog.Builder(this).setTitle("是否退出？")
102                     .setPositiveButton("确定", new OnClickListener() {
103                         @Override
104                         public void onClick(DialogInterface arg0, int arg1) {
105                             finish();
106                         }
107                     }).setNegativeButton("取消", null).show();
108             return true;
109         }
110         return super.onKeyUp(keyCode, event);
111     }
112 }