利用Android的Log 演示一个activity的生命周期

代码：   //DemoActivity.java      package uni.activity;   /*    @author octobershiner    2011 7 22    SE.HIT  */   import android.app.Activity;   import android.os.Bundle;   import android.util.Log;      public class ActivityDemoActivity extends Activity {       /** Called when the activity is first created. */              private static final String TAG = "demo";       @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);           Log.d("demo", "this is a test string ");       }          protected void onStart(){           super.onStart();           Log.i(TAG, "The activity state---->onStart");       }              protected void onRestart(){           super.onRestart();           Log.i(TAG, "The activity state---->onReatart");       }          protected void onResume(){           super.onResume();           Log.i(TAG, "The activity state---->onResume");  }          protected void onPause(){           super.onPause();           Log.i(TAG, "The activity state---->onPause");       }          protected void onStop(){           super.onStop();           Log.i(TAG, "The activity state---->onStop");       }          protected void onDestroy(){           super.onDestroy();           Log.i(TAG, "The activity state---->onDestroy");       }             }

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

另外过滤查看log的方法：

实例

Log.i("yourDemo","this is my log");

没有LOGCAT窗口的朋友可以在window菜单中的show view中调出窗口

五个圆圈分别可以过滤五种不同的log

注意右边的绿色加号，单击可以自定义自己的过滤器，名字随便起就好了

by Log Tag栏目中选择你要创建的过滤规则，比如你要过滤出所遇TAG标记为“yourDemo”的log，就可以在里面输入yourDemo了

转自：http://www.cnblogs.com/octobershiner/archive/2011/10/22/2221354.html

利用Android的Log 演示一个activity的生命周期

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