Android编程之基于Log演示一个activity生命周期实例详解

摘要：本文实例讲述了Android编程之基于Log演示一个activity生命周期。分享给大家供大家参考，具体如下：利用Android的Log演示...

本文实例讲述了Android编程之基于Log演示一个activity生命周期。分享给大家供大家参考，具体如下：

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

复制代码代码如下: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

Android编程之基于Log演示一个activity生命周期实例详解1