Question

I am trying to make a button. I am always getting a R.id error.

"id cannot be resolved or is not a field."

This line throws the error:

LinearLayout layout = (LinearLayout) findViewById(R.id.layout1);

Every time i try to use something with R. it throws that same error.

If i create a field in R.java class which eclipse recommends

public static Object id;

Then, eclipse highlights .layout1

and the error said “layout1 cannot be resolved or is not a field.”

Here is the code:

import android.widget.Button;

Button myButton = new Button(this);
myButton.setText("Press Me");

Finally add the button to the layout:

LinearLayout layout = (LinearLayout) findViewById(R.id.layout1);
layout.addView(myButton);

Any help is much appreciated. Is there a way to drag and drop controls? and why cant i ever use R.id?

Answer 1

In the XML definition of your layout, does it have the attribute “android:id=”layout1″”? That’s how you give names for your widget IDs.