Android编程之基于Log演示一个activity生命周期实例详解

2020-04-11 11:09:36

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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.javapackage uni.activity;/*@author octobershiner2011 7 22SE.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---->onStart07-22 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---->onPause07-22 11:18:35.090: INFO/demo(281): The activity state---->onStop07-22 11:18:35.090: INFO/demo(281): The activity state---->onDestroy//再次启动demo07-22 11:18:45.550: INFO/demo(281): The activity state---->onStart07-22 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---->onPause07-22 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---->onReatart07-22 11:19:03.550: INFO/demo(281): The activity state---->onStart07-22 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