button cannot be resolved to a type

Common bugs/problems with the Android SDK the Emulator and the ADT-Plugin.

button cannot be resolved to a type

Postby im abcd » Sun Apr 22, 2012 7:18 pm

I have just started android development and i cannot even compile a simple program because i get a error " button cannot be resolved to a type " in the .java file .

.java file :

Code: Select all
package abcd.pack;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class Project1Activity extends Activity {
    /** Called when the activity is first created. */
   
   int Counter;
   Button add;
   Button sub;
   TextView display;
   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Counter = 0 ;
        add = (Buttton) findViewById(R.id.bAdd);
        sub = (Button) findViewById(R.id.bSub);
        display = (TextView) findViewById(R.id.tvDisplay);
        add.setOnClickListener(new View.OnClickListener() {
         
         public void onClick(View arg0) {
            Counter++;
            display.setText("Your total is " + Counter);
                        // TODO Auto-generated method stub
            
         }
      });
     sub.setOnClickListener(new View.OnClickListener() {
      
      public void onClick(View v) {
         
         Counter--;
         display.setText("Your total is " + Counter);
         
         // TODO Auto-generated method stub
         
      }
   });
    }
}




And this is my main.xml

Code: Select all
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Your total is zero"
        android:textSize="45dp"
        android:id="@+id/tvDisplay"
       
         />

    <Button
        android:id="@+id/bAdd"
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:text="add one"
        android:textSize="20dp" />
   
      <Button
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:text="substract one"
        android:layout_gravity="center"
        android:textSize="20dp"
        android:id="@+id/bSub"
       
        />

   
</LinearLayout>



So what am i doing wrong ?
im abcd
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Joined: Sun Apr 22, 2012 7:04 pm

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