慕課網--radioGroup

radioGroup可以實現單選

注意 OnCheckedChangeListener() 爲radioGroup的方法，需要import android.widget.RadioGroup.OnCheckedChangeListener;

而onCheckedChanged() 方法的checkedId參數爲被選中radioButton的ID，可以在switch的case中用R.id.radio0的形式去匹配。

當然，也可以單個的RadioButton來實現監聽，而不是用RadioGroup判斷ID 的形式。

package com.example.test_radio_group;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity implements OnCheckedChangeListener{
	private RadioGroup rg;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		rg = (RadioGroup) findViewById(R.id.radioGroup1);
		rg.setOnCheckedChangeListener(this);
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		RadioButton rb;
		String mtext;
		rb = (RadioButton) findViewById(checkedId);
		mtext = rb.getText().toString();
		switch(checkedId){
		case R.id.radio0:
			Log.i("log", mtext);
			break;
		case R.id.radio1:
			Log.i("log", mtext);
			break;
		default:
			break;
		
		}
		
	}
}

<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="com.example.test_radio_group.MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:orientation="horizontal"
        android:layout_alignParentTop="true" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="男" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女" />

    </RadioGroup>

</RelativeLayout>