how to make an image show when radio button is clicked - android-studio

Question

I know this is a simple question but I'm a beginner and I have this homework where we
have to make an image show when the radio button is clicked but they didn't teach us anything about that
because of coronavirus so I would really appreciate it if someone could tell me how to do it.

Answer 1

For creating two radio buttons with simple image, and control visibility of image when check one of the radio buttons, I will give some simple steps to build that in java.
After build a new empty activity project:
You can open the wanted files from project explorer as shown :
go to activity_main.xml which is the layout file, I will create Linear layout with image and radio group contains two radio buttons,and I used imageview android:src attribute as a color (you can change it to image):
<ImageView
android:id="#+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#color/colorPrimary"
android:text="Hello World!"
android:visibility="gone" />
<RadioGroup
android:id="#+id/radioGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:orientation="horizontal">
<RadioButton
android:id="#+id/radio_button_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice-1" />
<RadioButton
android:id="#+id/radio_button_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choice-2" />
</RadioGroup>
Second, we need to go to java file named as MainActivity which is java file, and we will get the views and create a listener on the RadioGroup which we will use to show and hide the image (some comments help you understands the java code):
package com.your.packagename.here;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.RadioGroup;
public class MainActivity extends AppCompatActivity {
private ImageView image;
private RadioGroup radioGroup;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//intit views
image = findViewById(R.id.imageView);
radioGroup = findViewById(R.id.radioGroup);
//create the listener for radio group
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
//check if the choice-1 is selected
if (radioGroup.getCheckedRadioButtonId() == R.id.radio_button_choice1) {
//show image wen select choice-1
image.setVisibility(View.VISIBLE);
} else {
//hide image when choice-1 not selected
image.setVisibility(View.GONE);
}
}
});
}
}
Finally, and you will get similar to this.
I hope this was helped you.