Android_单选按钮（第一季重制版）

1.单选按钮(RadioButton)的基本概念

2.RadioGroup与RadioButton

3.OnClickListener与OnCheckedChangeListener监听器

<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" >

<RadioGroup
android:id="@+id/radioGroupId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">

<RadioButton
android:id="@+id/femaleButtonId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="female"/>

<RadioButton
android:id="@+id/maleButtonId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="male"
/>
</RadioGroup>

</LinearLayout>

package com.marschen.s01_e10_radio;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity {

private RadioGroup radioGroup;
private RadioButton femaleButton;
private RadioButton maleButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

radioGroup = (RadioGroup)findViewById(R.id.radioGroupId);
femaleButton = (RadioButton)findViewById(R.id.femaleButtonId);
maleButton = (RadioButton)findViewById(R.id.maleButtonId);

RadioGroupListener listener = new RadioGroupListener();
radioGroup.setOnCheckedChangeListener(listener);

RadioButtonListener radioButtonListener = new RadioButtonListener();
femaleButton.setOnCheckedChangeListener(radioButtonListener);
}

class RadioButtonListener implements android.widget.CompoundButton.OnCheckedChangeListener{

@Override
public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
System.out.println("isChecked--->" + isChecked);
}
}

class RadioGroupListener implements OnCheckedChangeListener{

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if(checkedId == femaleButton.getId()){
System.out.println("选中了female");
}
else if(checkedId == maleButton.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.activity_main, menu);
return true;
}

}