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RadioGroup 单选按钮组, 可以包含多个单选按钮,当单选按钮选中状态改变时会触发setOnCheckedChangeListener
package shortcut.song.com.myapplication;import android.graphics.Color; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.RadioGroup; import android.widget.RelativeLayout;public class RadioButtonActivity extends AppCompatActivity {RadioGroup mRadioGroup;RelativeLayout mRelativeLayout;@Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_radio_button);mRadioGroup = (RadioGroup)findViewById(R.id.radiogroup1);mRelativeLayout = (RelativeLayout)findViewById(R.id.activity_radio_button);
mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Override public void onCheckedChanged(RadioGroup group, int checkedId) {switch(checkedId){case R.id.radio1:mRelativeLayout.setBackgroundColor(Color.RED);break;case R.id.radio2:mRelativeLayout.setBackgroundColor(Color.GREEN);break;case R.id.radio3:mRelativeLayout.setBackgroundColor(Color.BLUE);break;}}});} }
layout布局,包含了一个RadioGroup,和三个RadioButton
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_radio_button" 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="shortcut.song.com.myapplication.RadioButtonActivity"><RadioGroup android:id="@+id/radiogroup1" android:layout_width="match_parent" android:layout_height="match_parent"><RadioButton android:id="@+id/radio1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="红色" /><RadioButton android:id="@+id/radio2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="绿色" /><RadioButton android:id="@+id/radio3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="蓝色" /></RadioGroup> </RelativeLayout>
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