?? mainactivity.java
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package com.himi.radiobutton;import android.app.Activity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;import android.widget.RadioGroup.OnCheckedChangeListener;//使用狀態改變監聽器public class MainActivity extends Activity implements OnCheckedChangeListener { private RadioButton rb1, rb2, rb3; private RadioGroup rg; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); rb1 = (RadioButton) findViewById(R.id.rb1); rb2 = (RadioButton) findViewById(R.id.rb2); rb3 = (RadioButton) findViewById(R.id.rb3); rg = (RadioGroup) findViewById(R.id.radGrp); rg.setOnCheckedChangeListener(this);//將單選組綁定監聽器 } //重寫監聽器函數 /** * @param group：指單選組 * @param group：指單選組中發生狀態改變的RadioButton的內存ID！ */ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (group == rg) {//因為當前程序中只有一個RadioGroup，此步可以不進行判定 String rbName = null; if (checkedId == rb1.getId()) { rbName = rb1.getText().toString(); } else if (checkedId == rb2.getId()) { rbName = rb2.getText().toString(); } else if (checkedId == rb3.getId()) { rbName = rb3.getText().toString(); } Toast.makeText(this, "選擇了下標為“" + rbName + "”的單選按鈕", Toast.LENGTH_LONG).show(); } }}?? 快捷鍵說明
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