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();
     }
 }

MainActivity

 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;
     }

 }

TestFragment

此方法是动态创建fragment