4 

     4 

     5 import android.os.Bundle;

     5 import android.os.Bundle;

     6 import android.support.v4.app.FragmentActivity;

     6 import android.support.v4.app.FragmentActivity;

     7 import android.support.v4.app.FragmentManager;

     7 import android.support.v4.app.FragmentManager;

     8 import android.support.v4.app.FragmentTransaction;

     8 import android.support.v4.app.FragmentTransaction;

    10 import android.view.Gravity;

     9 import android.view.Gravity;

    11 import android.view.View;

    10 import android.view.View;

    12 import android.view.View.OnClickListener;

    11 import android.view.View.OnClickListener;

    13 import android.widget.Button;

    12 import android.widget.Button;

    14 import android.widget.FrameLayout;

    13 import android.widget.FrameLayout;