Android studio实现单选按钮
本文实例为大家分享了Android studio实现单选按钮的具体代码，供大家参考，具体内容如下
创建空activity
编辑activity_main.xml文件
代码如下：
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
tools:context=".MainActivity">
<TextView
android:id="@+id/chooseTxt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/text1"
android:textColor="@color/colorblack"
android:textSize="30sp" />
//定义RaidGroup是要注意属性添加的位置
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
>
<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:button="@null"
android:drawableRight="@android:drawable/btn_radio"
android:text="@string/text2"
/>
<RadioButton
android:id="@+id/radioButton2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@string/text3"
/>
</RadioGroup>
<Button
android:id="@+id/ClearBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/text4" />
<Button
android:id="@+id/AddBtn"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/text5"
/>
</androidx.appcompat.widget.LinearLayoutCompat>
还有strings.xml文件，代码如下：
<resources>
<string name="app_name">My App</string>
<string name="text1">我选择的是...?</string>
<string name="text2">按钮1</string>
<string name="text3">按钮2</string>
<string name="text4">清除选中</string>
<string name="text5">添加子项</string>
</resources>
再是MainActivity.java文件，代码如下：
package com.example.myapp;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private RadioGroup radioGroup;
private RadioButton radioButton1;
private RadioButton radioButton2;
private Button radioClearBtn;
private Button radioAddBtn;
private TextView chooseTxt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioButton1 = findViewById(R.id.radioButton1);
radioButton2 = findViewById(R.id.radioButton2);
radioGroup= findViewById(R.id.radioGroup);
//设置选中变换监听
radioGroup.setOnCheckedChangeListener(onCheckedChangeListener);
//分别为两个按钮设置点击监听
radioClearBtn = findViewById(R.id.ClearBtn);
radioClearBtn.setOnClickListener(onClickListener);
radioAddBtn = findViewById(R.id.AddBtn);
radioAddBtn.setOnClickListener(onClickListener);
chooseTxt = findViewById(R.id.chooseTxt);
}
//onCheckedChangeListener()方法
private OnCheckedChangeListener onCheckedChangeListener=new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
//定义id并赋值被选中的单选按钮的id
int id = group.getCheckedRadioButtonId();
switch (id) {
case R.id.radioButton1:
chooseTxt.setText("我选择的是:" + radioButton1.getText());
break;
case R.id.radioButton2:
chooseTxt.setText("我选择的是:" + radioButton2.getText());
break;
default:
chooseTxt.setText("我选择的是:新增");
break;
}
}
};
private OnClickListener onClickListener = new OnClickListener() {
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.ClearBtn:
radioGroup.check(-1);//清除选项
chooseTxt.setText("我选择的是...?");
break;
case R.id.AddBtn:
RadioButton newRadio = new RadioButton(MainActivity.this);
//将新增的radiobutton加入到radioGroup中
newRadio.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT));
newRadio.setText("新增");
radioGroup.addView(newRadio, radioGroup.getChildCount());
break;
default:
break;
}
}
};
}
运行结果如下：
