No enclosing instance of the type MainActivity is accessible in scope error

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I got this error when i inserted MainActivity as a Parameter in Toast. This is the code

public class Toaster implements OnClickListener {

@Override
public void onClick(View clickedButton) {

String greetingText = "Hello from Android!";

Toast tempMessage = Toast.makeText(MainActivity.this , greetingText, Toast.LENGTH_SHORT);
tempMessage.show();
}

}

What could be the problem?...i am a beginner in Android development

Posted 22-Mar-14 22:45pm

Member 10549871

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Fredrik Bornander · Answer 1 · 2014-03-23T07:55:00

The first parameter to the makeText call should be an Activity instance, in your case it looks like you've copied a click-handler that was previously an anonymous type inside MainActivity. But since Toaster is not part of MainActivity you could try passing the Activity in to the Toaster.

Change your code to;

Java

public class Toaster implements OnClickListener {

  private final MainActivity mainActivity;

  public Toaster(final MainActivity mainActivity) {
    this.mainActivity = mainActivity;
  }
 
  @Override
  public void onClick(View clickedButton) {  
    final String greetingText = "Hello from Android!";
    final Toast tempMessage = Toast.makeText(mainActivity, greetingText, Toast.LENGTH_SHORT);
    tempMessage.show();
  }
}

and make sure to pass the instance of MainActivity to Toaster when calling it's constructor.

Hope this helps,
Fredrik

Krunal Rohit · Answer 2 · 2014-03-23T08:37:00

Well try this out,

Java

public class Toaster implements OnClickListener {

    Context ctx = this; 
    
    @Override
    public void onClick(View clickedButton) 
    {
        String greetingText = "Hello from Android!";
        Toast.makeText(cyx , greetingText, Toast.LENGTH_SHORT).show();
    }
 
}

-KR

Xiao Ling · Answer 3 · 2014-03-23T23:25:00

You can create the Toaster class inside the MainActivity.

public class MainActivity extends Activity {
	
	public class Toaster implements OnClickListener {

		@Override
		public void onClick(View clickedButton) {

			String greetingText = "Hello from Android!";

			Toast tempMessage = Toast.makeText(MainActivity.this, greetingText,
					Toast.LENGTH_SHORT);
			tempMessage.show();
		}

	}
}

No enclosing instance of the type MainActivity is accessible in scope error

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