Go语言视频零基础入门到精通

jspfan

代码： //DemoActivity.java  

3   

4 package uni.activity;  

5 /*

6   @author octobershiner

7   2011 7 22

8   SE.HIT

9 */  

10 import android.app.Activity;  

11 import android.os.Bundle;  

12 import android.util.Log;  

13   

14 public class ActivityDemoActivity extends Activity {  

15     /** Called when the activity is first created. */  

16      

17     private static final String TAG = "demo";  

18     @Override  

19     public void onCreate(Bundle savedInstanceState) {  

20         super.onCreate(savedInstanceState);  

21         setContentView(R.layout.main);  

22         Log.d("demo", "this is a test string ");  

23     }  

24   

25     protected void onStart(){  

26         super.onStart();  

27         Log.i(TAG, "The activity state---->onStart");  

28     }  

29      

30     protected void onRestart(){  

31         super.onRestart();  

32         Log.i(TAG, "The activity state---->onReatart");  

33     }  

34   

35     protected void onResume(){  

36         super.onResume();  

37         Log.i(TAG, "The activity state---->onResume");

38 }  

39   

40     protected void onPause(){  

41         super.onPause();  

42         Log.i(TAG, "The activity state---->onPause");  

43     }  

44   

45     protected void onStop(){  

46         super.onStop();  

47         Log.i(TAG, "The activity state---->onStop");  

48     }  

49   

50     protected void onDestroy(){  

51         super.onDestroy();  

52         Log.i(TAG, "The activity state---->onDestroy");  

53     }  

54   

55      

56 }  
复制代码
演示sundy留的小作业 截取LOG


这是演示的结果
//利用LOG展示activity的生命周期  
//注释表示 中间执行的操作 为方便的观察数据，可以在LOGCAT窗口（没有的话可以在window菜单中的show view中调出）的右侧单击加号创建一个过滤器，我的例子中过滤的是demo

//开始运行demo
07-22 11:18:19.311: INFO/demo(281): The activity state---->onStart
07-22 11:18:19.311: INFO/demo(281): The activity state---->onResume

//按下了back键 返回 activity从stack中弹出
07-22 11:18:34.821: INFO/demo(281): The activity state---->onPause
07-22 11:18:35.090: INFO/demo(281): The activity state---->onStop
07-22 11:18:35.090: INFO/demo(281): The activity state---->onDestroy

//再次启动demo
07-22 11:18:45.550: INFO/demo(281): The activity state---->onStart
07-22 11:18:45.550: INFO/demo(281): The activity state---->onResume

//按下了HOME键 当前TASK 处于后台转态，系统保存状态
07-22 11:18:53.750: INFO/demo(281): The activity state---->onPause
07-22 11:18:54.820: INFO/demo(281): The activity state---->onStop

//再次启动demo 回复原来的TASK activity在栈顶
07-22 11:19:03.550: INFO/demo(281): The activity state---->onReatart
07-22 11:19:03.550: INFO/demo(281): The activity state---->onStart
07-22 11:19:03.550: INFO/demo(281): The activity state---->onResume

期待与大家的共同成长