[android help] How do I use intend to change the Activites?

I made some buttons and i want to change to another activity when that button1 is clicked. but it won't find my viewImave.class

I'm

This is my MainActivity.java

     package com.example.image; 
   import android.os.Bundle;
   import android.view.View.*;
   import android.view.View;
   import android.view.View.OnClickListener;
   import android.widget.Button;
   import android.widget.Toast;
   import android.app.Activity;
   import android.content.Intent;
   import android.widget.ImageView;


   public class MainActivity extends Activity implements OnClickListener {
Toast toast;
      @Override
        protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button button1 = (Button)findViewById(R.id.button1);       
         button1.setText("take Image");
        button1.setOnClickListener(this); 
          final Button button2 = (Button)findViewById(R.id.button2);
         button2 = (Button)findViewById(R.id.button2);
      button2.setText("take Image2");
     benter code hereutton2.setOnClickListener(this);
       }

   @Override
     public void onClick (View v) {
         if(v.getId()==R.id.button1){
             Intent showimageIntent = new Intent(this, ViewImave.class);
                   startActivity(showimageIntent);
             }

         else if(v.getId()==R.id.button2)
         { 
             toast = Toast.makeText(this, "onclickbutton2", Toast.LENGTH_SHORT);
             toast.show();
             }

         else{
             toast = Toast.makeText(this, "error", Toast.LENGTH_SHORT);
             toast.show();
             }
         }


     }

This is my ViewImave.java

         package com.example.image;
          import android.app.Activity;
         import android.graphics.Bitmap;
         import android.graphics.Canvas;
         import android.graphics.Color;
          import android.graphics.drawable.Drawable;
             import android.os.Bundle;
         import android.view.View;
          import android.widget.Button;
           import android.widget.ImageView;
        import android.widget.Toast;
         import android.app.Activity;
          import android.view.Menu;

       public class ViewImave extends Activity {
 @Override
    protected void onCreate(Bundle savedInstanceState) {//
        setContentView(R.layout.showimage);
        Toast toast = Toast.makeText(this, "newimage oncreate", Toast.LENGTH_SHORT);
        toast.show();
       }
        }

This is showimage.xml

 
   android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
        android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:id="@+id/koala" />

    

This is activity_main.xml

         xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
       tools:context=".MainActivity" >

    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:text="Button" 
 />

    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/button1"
    android:text="Button" />

    

.

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