【代码】利用Android的Log 演示一个activity的生命周期

代码：//DemoActivity.javapackage 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");    }    }

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

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