codestory

Die Anleitung zu Android RadioGroup und RadioButton

View more Tutorials:

Folge uns auf unserer fanpage, um jedes Mal benachrichtigt zu werden, wenn es neue Artikel gibt. Facebook

1- RadioButton & RadioGroup

RadioButton ist ein view im Android. Er ist normaleweise mit RadioGroup benutzt. Davon ist RadioGroup ein Erhalter (container), die die RadioButton enthalten können. Wenn Sie auf einen Radiobutton in einer Gruppe zu wählen klicken, werden alle anderen Radionbutton in der Gruppe auswählen (deselect).

Unten ist das Bild von RadioButton , die in der unterschiedlichen Gruppe gesetzt werden
RadioGroup kann die RadioButton nach der horizontalen oder vertikalen Richtung arrangieren

2- das Beispiel mit RadioGroup & RadioButtons

Schauen Sie das Beispiel vor:
Erstellen Sie ein Projekt mit dem Name von AndroidRadioDemo.
  • File > New > New Project > Empty Activity
    • Name: AndroidRadioDemo
    • Package name: org.o7planning.androidradiodemo
    • Language: Java
Die Interface der Applikation
Wenn Sie an den Schritten zum Entwerfen der Benutzeroberfläche dieser Anwendung interessiert sind, lesen Sie bitte den Anhang am Ende des Artikels..
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="0dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="19dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Game Settings"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="19dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Game character"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <RadioGroup
        android:id="@+id/radioGroup_character"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2">

        <RadioButton
            android:id="@+id/radioButton_male"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Male" />

        <RadioButton
            android:id="@+id/radioButton_female"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Famale" />
    </RadioGroup>

    <TextView
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_height="29dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Difficulty Level"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_character" />

    <RadioGroup
        android:id="@+id/radioGroup_diffLevel"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3">

        <RadioButton
            android:id="@+id/radioButton_easy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Easy" />

        <RadioButton
            android:id="@+id/radioButton_medium"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Medium" />

        <RadioButton
            android:id="@+id/radioButton_hard"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Hard" />
    </RadioGroup>

    <Button
        android:id="@+id/button_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Save"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_diffLevel" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java

package org.o7planning.androidradiodemo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroupCharacter;
    private RadioButton radioButtonMale;
    private RadioButton radioButtonFemale;

    private RadioGroup radioGroupDiffLevel;
    private RadioButton radioButtonEasy;
    private RadioButton radioButtonMedium;
    private RadioButton radioButtonHard;

    private Button buttonSave;

    private String LOGTAG = "AndroidRadioDemo";

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

        //
        this.radioGroupCharacter= (RadioGroup) this.findViewById(R.id.radioGroup_character);
        this.radioButtonMale = (RadioButton) this.findViewById(R.id.radioButton_male);
        this.radioButtonFemale  =  (RadioButton)this.findViewById(R.id.radioButton_female);
        this.radioButtonMale.setChecked(true);

        //
        this.radioGroupDiffLevel= (RadioGroup) this.findViewById(R.id.radioGroup_diffLevel);
        this.radioButtonEasy = (RadioButton) this.findViewById(R.id.radioButton_easy);
        this.radioButtonMedium  =  (RadioButton)this.findViewById(R.id.radioButton_medium);
        this.radioButtonHard =  (RadioButton)this.findViewById(R.id.radioButton_hard);
        this.radioButtonMedium.setChecked(true);

        this.buttonSave= (Button) this.findViewById(R.id.button_save);

        // When radio group "Difficulty Level" checked change.
        this.radioGroupDiffLevel.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                doOnDifficultyLevelChanged(group, checkedId);
            }
        });

        // When radio button "Female" checked change.
        this.radioButtonMale.setOnCheckedChangeListener(new RadioButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                doOnGameCharacterChanged(buttonView,isChecked);
            }
        });

        // When radio button "Male" checked change.
        this.radioButtonFemale.setOnCheckedChangeListener(new RadioButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                doOnGameCharacterChanged(buttonView,isChecked);
            }
        });

        // When button "Save" clicked.
        this.buttonSave.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                doSave();
            }
        });
    }


    // When radio group "Difficulty Level" checked change.
    private void doOnDifficultyLevelChanged(RadioGroup group, int checkedId) {
        int checkedRadioId = group.getCheckedRadioButtonId();

        if(checkedRadioId== R.id.radioButton_easy) {
            Toast.makeText(this,"You choose the level of difficulty: Easy",Toast.LENGTH_SHORT).show();
        } else if(checkedRadioId== R.id.radioButton_medium ) {
            Toast.makeText(this,"You choose the level of difficulty: Medium",Toast.LENGTH_SHORT).show();
        } else if(checkedRadioId== R.id.radioButton_hard) {
            Toast.makeText(this,"You choose the level of difficulty: Hard",Toast.LENGTH_SHORT).show();
        }
    }

    // When radio button checked change.
    private void doOnGameCharacterChanged(CompoundButton buttonView, boolean isChecked)  {
        RadioButton radio =(RadioButton) buttonView;

        Log.i(LOGTAG, "RadioButton "+ radio.getText()+" : "+ isChecked);
    }

    // When button "Save" clicked.
    private void doSave()  {
        int difficultyLevel = this.radioGroupDiffLevel.getCheckedRadioButtonId();
        int gameCharacter = this.radioGroupCharacter.getCheckedRadioButtonId();

        RadioButton radioButtonDiffLevel = (RadioButton) this.findViewById(difficultyLevel);
        RadioButton radioButtonGameCharacter = (RadioButton) this.findViewById(gameCharacter);

        String message ="Difficulty Level: "+ radioButtonDiffLevel.getText()
                +", Game Character: " + radioButtonGameCharacter.getText() ;

        Toast.makeText(this,message,Toast.LENGTH_LONG).show();
    }
}

3- Anhang: Die Interface entwerfen

Legen Sie die Schriftgröße für die erste TextView fest, und legen Sie die horizontale Ausrichtung für die zweite RadioGroup fest.
Fügen Sie die RadioButton in die Interface ein:
Legen Sie ID, Text für die Komponenten in die Interface fest.

View more Tutorials:

Vielleicht bist du interessiert

Das sind die Online-Courses außer der Website o7planning, die wir empfehlen. Sie können umsonst sein oder Discount haben.