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Android Basics - RadioButton (radio button)

2020-11-07 20:58:02 ZHAO_JH

==* Here we start to reference event handling , You need to read the post first 《android Basics - Event handling 》==

brief introduction

RadioButton Radio buttons are placed in RadioGroup Use in , Get layout page selection item data in the back end

RadioButton Object methods paraphrase
getChildCount( ) Get the number of radio buttons in the button group ;
getChinldAt(i) Get our radio button based on the index value
isChecked( ) Determine whether the button is selected
getText() Get value

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Please choose gender "
        android:textSize="23dp"
        />

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

        <RadioButton
            android:id="@+id/btnMan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=" male "
            android:checked="true"/>

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

    <Button
        android:id="@+id/btnpost"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="myclick"
        android:text=" Submit "/>

</LinearLayout>

Listen to the button group ID Select trigger

MainActivity.java

package com.example.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //  preservation Activity The state of 
        super.onCreate(savedInstanceState);
        //  Load view 
        setContentView(R.layout.activity_main);
        //  Get radio button group object 
        RadioGroup radgroup = (RadioGroup) findViewById(R.id.radioGroup);

        //  Listen button 
        radgroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            //  The radio button group object is passed in as a parameter , In order to get the radio object 
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                //  Get radio objects 
                RadioButton radbtn = (RadioButton) findViewById(checkedId);
                Toast.makeText(getApplicationContext(), " Button group value changes , You chose " + radbtn.getText(), Toast.LENGTH_LONG).show();
            }
        });
    }
}

onClick Commit trigger

package com.example.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //  preservation Activity The state of 
        super.onCreate(savedInstanceState);
        //  Load view 
        setContentView(R.layout.activity_main);
    }
    public void myclick(View source)
    {
        //  Get radio button group object 
        RadioGroup radgroup = (RadioGroup) findViewById(R.id.radioGroup);
        //  Traverse the objects in the radio button group , Find a checked Object of property ( That is to find the selected object )
        for (int i = 0; i < radgroup.getChildCount(); i++) {
            RadioButton rd = (RadioButton) radgroup.getChildAt(i);
            if (rd.isChecked()) {
                Toast.makeText(getApplicationContext(), " Click Submit button , What you choose is :" + rd.getText(), Toast.LENGTH_LONG).show();
                break;
            }
        }
    }
}

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