Android开发（20）--RadioGroup的使用

RadioGroup 有时候比较有用．主要特征是给用户提供多选一机制。

MainActivity.java

package com.example.lesson16_radio;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
	private RadioGroup group_temo;
	private RadioButton checkRadioButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		group_temo = (RadioGroup) findViewById(R.id.radioGroup1);
		// 改变默认选项
		group_temo.check(R.id.radio1);

		// 获取默认被被选中值

		checkRadioButton = (RadioButton) group_temo.findViewById(group_temo
				.getCheckedRadioButtonId());

		Toast.makeText(this, "默认的选项的值是:" + checkRadioButton.getText(),
				Toast.LENGTH_LONG).show();

		// 注册事件
		group_temo
				.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

					@Override
					public void onCheckedChanged(RadioGroup group, int checkedId) {

						// 点击事件获取的选择对象
						checkRadioButton = (RadioButton) group_temo
								.findViewById(checkedId);

						Toast.makeText(getApplicationContext(),
								"获取的ID是" + checkRadioButton.getText(),
								Toast.LENGTH_LONG).show();
					}
				});
	}

}

布局文件