if statement and checkbox

if user checked the checkbox1 and checkbox2 and checkbox3 then click on button1 i want the code to take him to another activity .

there is my xml file code :

        <CheckBox
                android:id="@+id/checkBox0"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="stomache" />
             <CheckBox
                android:id="@+id/checkBox1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="Couphing" />
              <CheckBox
                android:id="@+id/checkBox2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="shortness of breath" />
               <CheckBox
                android:id="@+id/checkBox3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="weezing" />
                <CheckBox
                android:id="@+id/checkBox4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="Dermatitis or eczema" /> 
                <Button
              android:id="@+id/button1"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="Determine your Doctor" />

So I want if statement to do something when CheckBox1 and 2 and 3 is checked .