fragment 事务回滚 ---动态创建fragment

import java.util.Date;
import java.util.LinkedList;

import com.qianfeng.gp08_day23_fragment5.fragment.TestFragment;

import android.os.Bundle;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.view.Menu;
import android.view.View;

/**
 * 
 * 
 *
 */
public class MainActivity_2 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void addFragment(View v) {
        TestFragment fragment = new TestFragment();
        Bundle bundle = new Bundle();
        bundle.putString("msg", "xixi" + new Date());
        fragment.setArguments(bundle);
        
        FragmentTransaction tran = getFragmentManager().beginTransaction();
        
        tran.add(R.id.container, fragment);//remove1 add 2
        
        tran.addToBackStack(null);//把事务加入当前的回退栈  回滚

        tran.commit();
    }

    // 点击回退按钮显示上一个fragment
    public void backFragment(View v) {
        
        onBackPressed();
    }
}

import android.app.Activity;
import android.app.Fragment;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class TestFragment extends Fragment {

    private String args;
    
    @Override
    public void onAttach(Activity activity) {
        args = getArguments().getString("msg");
        super.onAttach(activity);
    }
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        TextView textView = new TextView(getActivity());
        textView.setText(args);
        int red = (int)(Math.random()*256);
        int green = (int)(Math.random()*256);
        int blue = (int)(Math.random()*256);
        
        textView.setBackgroundColor(Color.rgb(red, green, blue));
        return textView;
    }

}

 此方法是动态创建fragment