Android控件（RadioButton(单选button)）

枕上从妨一夜睡，灯前读尽十年诗。这篇文章主要讲述Android控件：RadioButton(单选button)相关的知识，希望能为你提供帮助。

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首先，在布局文件 activity_main.xml中注冊一个RadioGroup,并为RadioGroup设置监听，图中两个RadioButton为一个RadioGroup。

activity_main.xml

< LinearLayout 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:orientation="vertical" tools:context=".MainActivity"> < TextView android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" /> < RadioGroup android:id="@+id/radioGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" > < RadioButton android:id="@+id/femaleGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="female" /> < RadioButton android:id="@+id/maleGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="male"/> < /RadioGroup> < /LinearLayout>

MainActivity.java

import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.RadioButton; import android.widget.RadioGroup; public class MainActivity extends ActionBarActivity {private RadioGroup radioGroup; private RadioButton femaleRadioButton; private RadioButton maleRadioButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //载入布局文件 setContentView(R.layout.activity_main); //获取实例 radioGroup=(RadioGroup)findViewById(R.id.radioGroupID); femaleRadioButton=(RadioButton)findViewById(R.id.femaleGroupID); maleRadioButton=(RadioButton)findViewById(R.id.maleGroupID); //设置监听 radioGroup.setOnCheckedChangeListener(new RadioGroupListener()); } //定义一个RadioGroup的OnCheckedChangeListener //RadioGroup绑定的是RadioGroup.OnCheckedChangeListener //CheckBox绑定的是CompoundButton.OnCheckedChangeListener 或者 view.OnClickListener class RadioGroupListener implements RadioGroup.OnCheckedChangeListener{ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (checkedId==femaleRadioButton.getId()){ System.out.println("选中了female!"); }else if (checkedId==maleRadioButton.getId()){ System.out.println("选中了male!"); } } }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.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(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; }return super.onOptionsItemSelected(item); } }

日志显演示样例如以下：