Ich möchte meine ändernActivity zuFragment Ich habe mich sehr bemüht, aber ich kann meine Aktivität nicht in Fragment ändern. Kann mir bitte jemand sagen, wie das geht? Wo bearbeite ich? Ich bin neu auf Android. Bitte sag es mir und danke im Voraus

Das ist meine Aktivität:

import android.app.Activity;

   import android.app.ProgressDialog;
   import android.content.Context;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.content.SharedPreferences.Editor;
   import android.os.Bundle;
  import android.os.StrictMode;

import android.view.View;
import android.view.View.OnClickListener;
 import android.view.LayoutInflater;
import android.view.ViewGroup;
 import android.view.Window;
 import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
 import android.widget.Toast;

 import com.example.phonebook.models.UserModel;
import com.example.phonebook.services.ImageLoader;

public class Welcome extends Activity {
private ProgressDialog pDialog;
Button editprofile;
JSONParser jsonParser = new JSONParser();

ImageView Image;
UserModel user = (UserModel) getIntent().getSerializableExtra("User");
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
    .detectDiskReads().detectDiskWrites().detectNetwork()
    .penaltyLog().build());
   setContentView(R.layout.welcome);


    requestWindowFeature(Window.FEATURE_NO_TITLE);

     user = (UserModel) getIntent().getSerializableExtra("User");
Button editprofile = (Button)findViewById(R.id.btn_edit);
    ImageView image = (ImageView)findViewById(R.id.imageView1);
    TextView userfullname = (TextView) findViewById(R.id.userfullname);
    TextView tv_age = (TextView) findViewById(R.id.age);
    TextView tv_gender = (TextView) findViewById(R.id.gender);
    TextView tv_intrseted = (TextView) findViewById(R.id.intrestedin);


    int loader = R.drawable.loader;

    String UserfullName = user.getUser_Full_Name();
    String image_url = user.getUser_Image();
    String Age = user.getUser_Age();
    String Gender = user.getGender();
    String IntrestedIn = user.getIntrest_In();
    userfullname.setText(UserfullName);
    tv_age.setText(Age);
    tv_gender.setText(Gender);
    tv_intrseted.setText(IntrestedIn);
    Button logout=(Button)findViewById(R.id.logout);
    logout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            SharedPreferences sharedPreferences =getSharedPreferences(MainActivity.MyLOGINDATA, Context.MODE_PRIVATE);

                      Editor editor = sharedPreferences.edit();
                      editor.clear();
                      editor.commit();
                      moveTaskToBack(true); 
                      Intent i=new Intent(getApplicationContext(),MainActivity.class);
                      startActivity(i);
                      finish();

        }
    });

    editprofile.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent e = new Intent(getApplicationContext(),
                    EditProfile.class);
            e.putExtra("userInfo", user);
            finish();
            startActivity(e);

        }
    });

    // ImageLoader class instance
    ImageLoader imgLoader = new ImageLoader(getApplicationContext(),
            Welcome.this);

    image.setTag(image_url);

// whenever you want to load an image from url
// call DisplayImage function
// url - image url to load
// loader - loader image, will be displayed before getting image
// image - ImageView 
    imgLoader.DisplayImage(image_url, Welcome.this, image);
}

}