第十七篇-使用RadioGroup实现单项选择

上效果图

首先进行控件布局，一个textview，6个radiobutton，

main_activity.xml

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout 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="match_parent"

    tools:context=".MainActivity">

    <TextView

        android:id="@+id/textView"

        android:layout_width="233dp"

        android:layout_height="74dp"

        android:textSize="35sp"

        tools:ignore="MissingConstraints"

        tools:layout_editor_absoluteX="0dp"

        tools:layout_editor_absoluteY="25dp" />

    <RadioGroup

        android:id="@+id/RG"

        android:layout_width="264dp"

        android:layout_height="202dp"

        android:layout_marginTop="16dp"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/textView"

        tools:ignore="MissingConstraints">

        <RadioButton

            android:id="@+id/RB1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton1"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="62dp"

            tools:layout_editor_absoluteY="87dp" />

        <RadioButton

            android:id="@+id/RB2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton2"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="62dp"

            tools:layout_editor_absoluteY="143dp" />

        <RadioButton

            android:id="@+id/RB3"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton3"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="62dp"

            tools:layout_editor_absoluteY="214dp" />

        <RadioButton

            android:id="@+id/RB4"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton4"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="62dp"

            tools:layout_editor_absoluteY="278dp" />

        <RadioButton

            android:id="@+id/RB5"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton5"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="62dp"

            tools:layout_editor_absoluteY="356dp" />

        <RadioButton

            android:id="@+id/RB6"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/radiobutton6"

            tools:ignore="MissingConstraints"

            tools:layout_editor_absoluteX="61dp"

            tools:layout_editor_absoluteY="429dp" />

    </RadioGroup>

</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.example.aimee.radiogrouptest;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.MotionEvent;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    TextView textview;

    RadioGroup RG;

    RadioButton RB1;

    RadioButton RB2;

    RadioButton RB3;

    RadioButton RB4;

    RadioButton RB5;

    RadioButton RB6;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        textview=findViewById(R.id.textView);

        RG=findViewById(R.id.RG);

        RB1=findViewById(R.id.RB1);

        RB2=findViewById(R.id.RB2);

        RB3=findViewById(R.id.RB3);

        RB4=findViewById(R.id.RB4);

        RB5=findViewById(R.id.RB5);

        RB6=findViewById(R.id.RB6);

        RG.setOnCheckedChangeListener(ChangeRadioGroup);

    }

    private RadioGroup.OnCheckedChangeListener ChangeRadioGroup=new RadioGroup.OnCheckedChangeListener() {

        @Override

        public void onCheckedChanged(RadioGroup group, int checkedId) {

            if(checkedId==RB1.getId()&&RB1.isChecked()){

                textview.setText(RB1.getText());

                Toast.makeText(MainActivity.this,RB1.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

            else if(checkedId==RB2.getId()&&RB2.isChecked()){

                textview.setText(RB2.getText());

                Toast.makeText(MainActivity.this,RB2.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

            else if(checkedId==RB3.getId()&&RB3.isChecked()){

                textview.setText(RB3.getText());

                Toast.makeText(MainActivity.this,RB3.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

            else if(checkedId==RB4.getId()&&RB4.isChecked()){

                textview.setText(RB4.getText());

                Toast.makeText(MainActivity.this,RB4.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

            else if(checkedId==RB5.getId()&&RB5.isChecked()){

                textview.setText(RB5.getText());

                Toast.makeText(MainActivity.this,RB5.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

            else if(checkedId==RB6.getId()&&RB6.isChecked()){

                textview.setText(RB6.getText());

                Toast.makeText(MainActivity.this,RB6.getText()+"被选择",Toast.LENGTH_SHORT).show();

            }

        }

    };

}

/res/values/string.xml

<resources>

    <string name="app_name">RadioGroupTest</string>

    <string name="radiobutton1">Android</string>

    <string name="radiobutton2">Sysbian</string>

    <string name="radiobutton3">WinCE</string>

    <string name="radiobutton4">PalmOS</string>

    <string name="radiobutton5">Linux</string>

    <string name="radiobutton6">iphoneOS</string>

</resources>

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第十七篇-使用RadioGroup实现单项选择

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