fragment 事务回滚 ---动态创建fragment

 1 import java.util.Date;
 2 import java.util.LinkedList;
 3
 4 import com.qianfeng.gp08_day23_fragment5.fragment.TestFragment;
 5
 6 import android.os.Bundle;
 7 import android.app.Activity;
 8 import android.app.Fragment;
 9 import android.app.FragmentTransaction;
10 import android.view.Menu;
11 import android.view.View;
12
13 /**
14  *
15  *
16  *
17  */
18 public class MainActivity_2 extends Activity {
19
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.activity_main);
24     }
25
26     public void addFragment(View v) {
27         TestFragment fragment = new TestFragment();
28         Bundle bundle = new Bundle();
29         bundle.putString("msg", "xixi" + new Date());
30         fragment.setArguments(bundle);
31
32         FragmentTransaction tran = getFragmentManager().beginTransaction();
33
34         tran.add(R.id.container, fragment);//remove1 add 2
35
36         tran.addToBackStack(null);//把事务加入当前的回退栈  回滚
37
38         tran.commit();
39     }
40
41     // 点击回退按钮显示上一个fragment
42     public void backFragment(View v) {
43
44         onBackPressed();
45     }
46 }

MainActivity

 1 import android.app.Activity;
 2 import android.app.Fragment;
 3 import android.graphics.Color;
 4 import android.os.Bundle;
 5 import android.view.LayoutInflater;
 6 import android.view.View;
 7 import android.view.ViewGroup;
 8 import android.widget.TextView;
 9
10 public class TestFragment extends Fragment {
11
12     private String args;
13
14     @Override
15     public void onAttach(Activity activity) {
16         args = getArguments().getString("msg");
17         super.onAttach(activity);
18     }
19
20     @Override
21     public View onCreateView(LayoutInflater inflater, ViewGroup container,
22             Bundle savedInstanceState) {
23         TextView textView = new TextView(getActivity());
24         textView.setText(args);
25         int red = (int)(Math.random()*256);
26         int green = (int)(Math.random()*256);
27         int blue = (int)(Math.random()*256);
28
29         textView.setBackgroundColor(Color.rgb(red, green, blue));
30         return textView;
31     }
32
33 }

TestFragment

此方法是动态创建fragment